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WO1999020085A1 - Circuit de lampe electrique et structure utilisant des diodes electroluminescentes - Google Patents

Circuit de lampe electrique et structure utilisant des diodes electroluminescentes Download PDF

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Publication number
WO1999020085A1
WO1999020085A1 PCT/KR1998/000306 KR9800306W WO9920085A1 WO 1999020085 A1 WO1999020085 A1 WO 1999020085A1 KR 9800306 W KR9800306 W KR 9800306W WO 9920085 A1 WO9920085 A1 WO 9920085A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
light emitting
voltage
power supply
circuit
Prior art date
Application number
PCT/KR1998/000306
Other languages
English (en)
Inventor
Byung Hyo Min
Chan Koo Jeon
Ir Bong Jeon
Wan Ho Oh
Original Assignee
Se Kang Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2019970028064U external-priority patent/KR19990014904U/ko
Priority claimed from KR1019980017948A external-priority patent/KR19990085501A/ko
Priority claimed from KR1019980022249A external-priority patent/KR100287781B1/ko
Application filed by Se Kang Electric Co., Ltd. filed Critical Se Kang Electric Co., Ltd.
Priority to AU94654/98A priority Critical patent/AU9465498A/en
Publication of WO1999020085A1 publication Critical patent/WO1999020085A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/42—Antiparallel configurations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/05—Special features for controlling or switching of the light beam
    • B60Q2300/054—Variable non-standard intensity, i.e. emission of various beam intensities different from standard intensities, e.g. continuous or stepped transitions of intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/10—Indexing codes relating to particular vehicle conditions
    • B60Q2300/14—Other vehicle conditions
    • B60Q2300/146—Abnormalities, e.g. fail-safe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/30—Indexing codes relating to the vehicle environment
    • B60Q2300/31—Atmospheric conditions
    • B60Q2300/314—Ambient light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/33—Pulse-amplitude modulation [PAM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates in general to electric lamp circuits and structures for application to traffic signal lamps, street lamps and others, and more particularly to an electric lamp circuit and structure using light emitting diodes, which can generate high luminance using low power.
  • Traffic signal lamps are generally disposed in crosswalks of crossroads to indicate vehicle or pedestrian passage.
  • a conventional traffic signal lamp is provided with one electric bulb, resulting in frequent failure and a large amount of power consumption.
  • a structure with a plurality of light emitting diodes (referred to hereinafter as LEDs) connected in series has therefore been proposed to overcome such a problem.
  • Figs. 1 and 2 show examples of conventional electric lamp circuits applied to traffic signal lamps.
  • the reference numeral 11 denotes a light emitting circuit which is provided with a plurality of LEDs D n , D 12 , ..., D MN arranged in a matrix form of M rows x N columns.
  • the reference numeral 12 denotes a power source which supplies an alternating current (AC) voltage to the light emitting circuit 11.
  • the reference numeral 13 denotes a variable resistor which forms a closed loop with the light emitting circuit 11 and power source 12 and adjusts the amount of current flowing to the light emitting circuit 11.
  • the LEDs D ⁇ , D 12 , ..., D, ⁇ are connected in series in respective rows in such a manner that they have the same polarities in the respective rows.
  • the light emitting circuit 11 consists of a first LED group 11A turned on for a positive (+) half period of the AC voltage from the power source 12, and a second LED group
  • first and second LED groups 11A and 1 IB turned on for a negative (-) half period of the AC voltage.
  • the first and second LED groups 11A and 1 IB are alternately turned on, they seem to remain turned on, because the power source 12 typically has a frequency of 60Hz.
  • the reference numeral 21 denotes a light emitting circuit which is provided with a plurality of LEDs D ⁇ , D 12 , ..., D ⁇ arranged in a matrix form of M rows x N columns.
  • the reference numeral 22 denotes a power source which supplies an AC voltage.
  • the reference numeral 23 denotes a bridge rectifier which full-wave rectifies the AC voltage from the power source 22 to supply a direct current (DC) voltage to the light emitting circuit 21.
  • the reference numeral 24 denotes a variable resistor which forms a closed loop with the light emitting circuit 21 and bridge rectifier 23 and adjusts the amount of current flowing to the light emitting circuit 21.
  • the LEDs D ⁇ , D 12 , ..., D ⁇ are connected in series in respective rows and have the same polarity.
  • the above-mentioned conventional electric lamp circuits using the LEDs have a disadvantage in that the LEDs are connected in series in respective rows. Namely, if any one of the LEDs fails, no current flows to any of the LEDs connected in the row to which the failed
  • a plurality of lamps LI, L2 and L3 are connected in series to a power source 30, and symmetrical Zener diodes VRD1, VRD2 and VRD3 are connected in parallel respectively to the lamps LI, L2 and L3.
  • Each of the symmetrical Zener diodes VRD1, VRD2 and VRD3 has a Zener voltage slightly higher than a peak value of a voltage which is applied across the lamp at a normal state.
  • thermistors which convert temperatures into resistances may be used instead of the symmetrical Zener diodes VRD1, VRD2 and VRD3. 5
  • a specific one of the lamps is short-circuited, a high voltage is applied to the thermistor connected in parallel to the specific lamp, to heat it. Then, as the thermistor connected in parallel to the specific lamp is reduced in resistance, current flows therethrough, thereby normally turning the other lamps on. 0 In the circuit of Fig. 3, even if one light emitter fails, the other light emitters are normally turned on. This solves the entire failure.
  • the above-mentioned circuit is disadvantageous in that one symmetrical Zener diode is connected in parallel to every light emitter, resulting in an increase in the number of components. The increased number of 5 components then results in an increase in manufacturing cost of products and hinders miniaturization thereof.
  • the same number of symmetrical Zener diodes or thermistors are thus required therein.
  • the above-mentioned conventional electric lamp circuits have a further disadvantage in that they have no method capable of coping with a variation in a drive voltage applied thereto.
  • the present invention has been made in view of the o above problems, and it is an object of the present invention to provide an electric lamp circuit using LEDs, in which the LEDs are connected in parallel in respective columns in a light emitting circuit, so that, even though a specific one of the LEDs fails, the other LEDs of the same row can normally be turned on. 5 It is another object of the present invention to provide an electric lamp circuit using LEDs, in which there is provided a circuit for detecting the amount of current flowing to a light emitting circuit and correcting a voltage variation on the basis of the detected result, thereby avoiding luminance degradation and lighting failure and preventing overcurrent 5 from flowing to the light emitting circuit.
  • an electric lamp circuit comprising light emitting means including a plurality of LEDs arranged in a matrix form of M rows x N o columns; power supply means for supplying an AC voltage to the light emitting means; and variable resistor means for forming a closed loop with the light emitting means and power supply means and adjusting the amount of current flowing to the light emitting means, wherein the LEDs in the light emitting means are arranged in such a net form that they are 5 connected in series in respective rows and in parallel in respective columns, the LEDs in a part of the rows having the same polarity and constituting a first LED group turned on for a positive (+) half period of the AC voltage supplied from the power supply means, the LEDs in the other part of the rows having the opposite polarity to that of the LEDs of the first LED group and constituting a second LED group turned on for a negative (-) half period of the AC voltage from the power supply means.
  • the electric lamp circuit further comprises boosting means for boosting the AC voltage from the power supply means to a predetermined level when the light emitting means is not turned on because the AC voltage from the power supply means falls below a first reference value; and system control means for detecting the level of the AC voltage from the power supply means, discriminating the detected voltage level and adjusting a resistance of the variable resistor means or operating the boosting means in accordance with the discriminated result.
  • the variable resistor means includes a first switch operative under control of the system control means for connecting the power supply means to the light emitting means if the AC voltage from the power supply means is within the range between the first reference value and a second reference value, the second reference value being higher than the first reference value; a first resistor having a first resistance, the first resistor being adapted to, if the AC voltage from the power supply means is within the range between the second reference value and a third reference value, the third reference value being higher than the second reference value, connect the power supply means to the light emitting means to allow current within a predetermined range to flow to the light emitting means; a second resistor having a second resistance larger than the first resistance of the first resistor, the second resistor being adapted to connect the power supply means to the light emitting means if the AC voltage from the power supply means is above the third reference value; and a second switch operative under control of the system control means for selectively connecting the power supply means to the first resistor or the second resistor.
  • the system control means includes a voltage detector for detecting the level of the AC voltage from the power supply means; a level discriminator for discriminating the voltage level detected by the voltage detector; a third switch for selectively connecting the power supply means to the variable resistor means or the boosting means; and a driver operative in response to an output signal from the level discriminator for controlling the third switch to determine a current path and for, if the power supply means is connected to the variable resistor means by the third switch, controlling the variable resistor means to adjust the resistance thereof according to the level of the AC voltage from the power supply means.
  • an electric lamp circuit comprising light emitting means including a plurality of LEDs arranged in a matrix form of M rows x N columns; power supply means for supplying an AC voltage; bridge rectification means for full-wave rectifying the AC voltage from the 0 power supply means to supply a DC voltage to the light emitting means; and variable resistor means for forming a closed loop with the light emitting means and bridge rectification means and adjusting the amount of current flowing to the light emitting means, wherein the LEDs in the light emitting means have the same polarity and are arranged in such a net 5 form that they are connected in series in respective rows and in parallel in respective columns.
  • an electric lamp circuit comprising light emitting means including a plurality of LEDs having the same polarity and arranged in a o matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns; power supply means for supplying an AC voltage; and bridge rectification means for full-wave rectifying the AC voltage from the power supply means, wherein the improvement comprises power means 5 for performing an analog control operation or a pulse width modulation operation with respect to an output voltage from the bridge rectification means to allow forward current to flow to the LEDs in the light emitting means; current detection means for detecting the amount of current flowing to the light emitting means; arithmetic means for obtaining the o average of the results detected by the current detection means; and control means for controlling the analog control operation or pulse width modulation operation of the power means in response to the current average obtained by the arithmetic means to adjust the amount of current flowing to the light emitting means. 5 The electric
  • the electric lamp circuit further comprises circuit regeneration means including N Zener diodes having the opposite polarity to that of the LEDs in the light emitting means and connected in series to one another and in parallel respectively to the LEDs in the respective columns, each of the Zener diodes being adapted to, if all the LEDs of the corresponding column fail, create breakdown to transfer current to the LEDs of the subsequent column.
  • an electric lamp circuit comprising light emitting means including a plurality of LEDs arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns, the LEDs in a part of the rows having the same polarity and constituting a first LED group turned on for a positive (+) half period of an AC voltage, the LEDs in the other part of the rows having the opposite polarity to that of the LEDs of the first LED group and constituting a second LED group turned on for a negative (-) half period of the AC voltage; and power supply means for supplying the AC voltage to the light emitting means, wherein the improvement comprises power means for performing an analog control operation or a pulse width modulation operation with respect to the AC voltage from the power supply means to allow forward current to flow to the LEDs in the light emitting means; current detection means for detecting the amount of current flowing to the light emitting means; arithmetic means for obtaining the
  • the electric lamp circuit further comprises circuit regeneration means including N pairs of Zener diodes with the opposite polarities, the
  • N Zener diode pairs being connected in series to one another and in parallel respectively to the LEDs in the respective columns, each of the N Zener diode pairs being adapted to, if all the LEDs of the corresponding column fail, create breakdown to transfer current to the LEDs of the subsequent column.
  • an electric lamp structure comprising a base inserted into a socket to be connected to an external power source; a plurality of LEDs for emitting light; N+l connectors for mounting the LEDs on an LED board in a matrix form of M rows x N columns; and a lens disposed in the front of the LED board for widely dispersing the light emitted by the o LEDs, wherein each of the connectors includes an external case having
  • an electric lamp structure comprising a base inserted into a socket to be connected to an external power source; a plurality of LEDs for emitting light; an LED board having a net-shaped pattern printed thereon; MxN connectors for mounting the LEDs on the pattern of the o LED board in a matrix form of M rows x N columns; and a lens disposed in the front of the LED board for widely dispersing the light emitted by the LEDs, wherein each of the connectors includes an external case having two pin holes formed thereon to receive lead terminals of each of the LEDs, respectively; and two metal connection pins inserted 5 respectively into the pin holes to individually support the lead terminals in the pin holes and connect them to the pattern of the LED board.
  • Fig. 1 is a circuit diagram of a conventional electric lamp circuit which comprises a light emitting circuit consisting of a first LED group turned on for a positive (+) half period of an AC voltage and a second 5 LED group turned on for a negative (-) half period of the AC voltage;
  • Fig. 2 is a circuit diagram of another conventional electric lamp circuit which comprises a bridge rectifier for supplying a DC voltage to a light emitting circuit;
  • Fig. 3 is a circuit diagram of yet another conventional electric lamp 5 circuit in which, even if any one of a plurality of lamps connected in series fails, the other lamps are normally turned on;
  • Figs. 4 and 5 are circuit diagrams of electric lamp circuits in accordance with first and second embodiments of the present invention, in whichA light emitting circuit includes LEDs connected in a net form; 0 Frg ) is a circuit diagram of an electric lamp circuit in accordance with a third embodiment of the present invention, in which a variation of an applied drive voltage is sensed and a resistance is adjusted on the basis of the sensed result to allow current within a predetermined range to flow to a light emitting circuit; 5 Figs.
  • FIG. 7 and 8 are circuit diagrams of electric lamp circuits in accordance with fourth and fifth embodiments of the present invention, in which the amount of current flowing to a light emitting circuit is detected and an analog control operation or a pulse width modulation operation is performed on the basis of the detected result to allow current o within a predetermined range to flow to the light emitting circuit;
  • Fig. 9 is a sectional view of an electric lamp structure to which the present invention is applied.
  • Figs. 10A and 10B are exploded perspective views illustrating an embodiment of connectors in Fig. 9 in accordance with the present 5 invention.
  • Figs. 11 A and 1 IB are exploded perspective views illustrating an alternative embodiment of the connectors in Fig. 9 in accordance with the present invention.
  • Fig. 4 is a circuit diagram of an electric lamp circuit in accordance with a first embodiment of the present invention.
  • the electric lamp circuit comprises a light emitting circuit 41, power source 42 and variable resistor 43.
  • the light emitting circuit 41 is provided with a plurality of LEDs D n , D 12 , ..., D, ⁇ 5 arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns.
  • the LEDs in a part of the rows have the same polarity and constitute a first LED group 41 A turned on for a positive (+) half period of an AC voltage supplied from the power source 42.
  • the 5 LEDs in the other part of the rows have the opposite polarity to that of the LEDs of the first LED group 41 A and constitute a second LED group 4 IB turned on for a negative (-) half period of the AC voltage.
  • the variable resistor 43 is adjusted in resistance to allow a desired amount of l o current to flow to the light emitting circuit 41.
  • the LEDs D, ,, D 12 , ..., D j ⁇ are turned on to emit light.
  • the voltage from the power source 42 is of AC
  • the LEDs in the first LED group 41 A are turned on for a positive (+) half period of the AC voltage
  • the LEDs in the second LED group 4 IB are turned on for a negative (-) half
  • the other LEDs belonging to the same column are supplied with current through LEDs of the other columns connected in parallel thereto, so as to normally emit light. For example, if the LED D n fails, current through the LEDs D 21 to D ⁇ l flows
  • Fig. 5 is a circuit diagram of an electric lamp circuit in accordance with a second embodiment of the present invention.
  • the electric lamp circuit comprises a light 25 emitting circuit 51, power source 52, bridge rectifier 53 and variable resistor 54.
  • the light emitting circuit 51 is provided with a plurality of LEDs D n , D 12 , ..., D MN having the same polarity and arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective
  • variable resistor 54 is then adjusted in resistance to allow a desired amount of current to flow to the light emitting circuit 51. As a result, all 35 the LEDs D H , D 12 , ..., D, ⁇ , in the light emitting circuit 51 are turned on to emit light.
  • the other LEDs belonging to -l ithe same column are supplied with current through LEDs of the other columns connected in parallel thereto, so as to normally emit light.
  • the LED D n fails, current through the LEDs D 21 to D M1 flows separately to the LEDs D 12 to D, ⁇ thereby allowing the LED D j normally emit light.
  • Fig. 6 is a circuit diagram of an electric lamp circuit in accordance with a third embodiment of the present invention.
  • the reference numeral 61 denotes a light emitting circuit which is provided with a plurality of LEDs D ⁇ , D 12 , ..., D j ⁇ arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns.
  • the reference numeral 62 denotes a power source which supplies an AC voltage of a desired frequency to the light emitting circuit 61.
  • the reference numeral 63 denotes a variable resistor circuit which is adjustable in resistance to constantly maintain the amount of current flowing to the light emitting circuit 61 when the power source 62 is connected to the light emitting circuit 61 to turn the LEDs therein on.
  • the reference numeral 64 denotes a booster which boosts the AC voltage from the power source 62 to a predetermined level when the variable resistor circuit 63 cannot maintain, within a predetermined range, the amount of current flowing to the light emitting circuit 61 because the AC voltage from the power source 62 falls below a first reference value. The booster 64 then supplies the boosted voltage to the light emitting circuit 61 to avoid lighting failure thereof.
  • the reference numeral 65 denotes a system controller which detects the level of the AC voltage from the power source 62, discriminates the detected voltage level and adjusts the resistance of the variable resistor circuit 63 or operates the booster 64 in accordance with the discriminated result.
  • the variable resistor circuit 63 includes a first resistor Rl having a first resistance and allowing current within a predetermined range to flow to the light emitting circuit 61 if the AC voltage from the power source 62 is within the range between second and third reference values.
  • the second reference value is higher than the first reference value
  • the third reference value is higher than the second reference value.
  • a first switch 63 A is connected in parallel to the first resistor Rl and operated under control of the system controller 65 to, if the AC voltage from the power source 62 is within the range between the first and second reference values, bypass the first resistor Rl to allow the current within the predetermined range to flow to the light emitting circuit 61.
  • a second resistor R2 has a second resistance larger than the first resistance and allows the current within the predetermined range to flow to the light 5 emitting circuit 61 if the AC voltage from the power source 62 is above the third reference value.
  • a second switch 63B is operated under control of the system controller 65 to selectively connect the power source 62 to the first resistor Rl or the second resistor R2.
  • the third reference value is a typical commercial voltage value which may be 110V 0 or 220V.
  • the system controller 65 includes a voltage detector 65A for detecting the level of the AC voltage from the power source 62, and a level discriminator 65B for discriminating the voltage level detected by the voltage detector 65A by comparing it with the first to third reference 5 values.
  • a third switch 65C is operated to selectively connect the power source 62 to the variable resistor circuit 63 or the booster 64.
  • a driver 65D is operated in response to an output signal from the level discriminator 65B to control the third switch 65C to determine a current path and to control the variable resistor circuit 63 to adjust the resistance o thereof.
  • the level of the AC voltage from the power source 62 is detected by the voltage detector 65A and then discriminated by the level discriminator 65B. At this time, the level discrimination is performed by comparing the voltage level detected by 5 the voltage detector 65 A with the first to third reference values.
  • the driver 65D determines that the variable resistor circuit 63 cannot maintain, within the predetermined range, the amount of current flowing to the light emitting circuit 61. Thus, the driver 65D controls the o third switch 65C to connect the power source 62 to the booster 64 through a terminal P. Then, the booster 64 boosts the AC voltage from the power source 62 to the predetermined level and supplies the boosted voltage to the light emitting circuit 61 to avoid lighting failure thereof.
  • the driver in the case where the AC voltage from the 5 power source 62 does not fall below the first reference value, the driver
  • the 65D controls the third switch 65C to connect the power source 62 to the variable resistor circuit 63 through a terminal Q. If the AC voltage from the power source 62 is above the third reference voltage, the driver 65D connects a terminal R of the second switch 63B to the power source 62 to, in turn, connect the power source 62 to the light emitting circuit 61 through the second resistor R2. If the AC voltage from the power source 62 is within the range between the second and third reference values, the driver 65D connects a terminal S of the second switch 63B to the power source 62 to, in turn, connect the power source 62 to the light emitting circuit 61 through the first resistor Rl. In the case where the AC voltage from the power source 62 is within the range between the first and second reference values, the driver 65D turns the first switch 63 A on to connect the power source 62 directly to the light emitting circuit 61.
  • variable resistor circuit 63 if the AC voltage from the power source 62 is within the range between the second and third reference values, the power source 62 is connected to the light emitting circuit 61 through the first resistor Rl so that the current within the predetermined range can flow to the light emitting circuit 61. If the AC voltage from the power source 62 is above the third reference value, current reduction is made by the second resistor R2 so that the current within the predetermined range can flow to the light emitting circuit 61. In the case where the AC voltage from the power source 62 is within the range between the first and second reference values, current increase is made by the first switch 63A so that the current within the predetermined range can flow to the light emitting circuit 61.
  • Fig. 7 is a circuit diagram of an electric lamp circuit in accordance with a fourth embodiment of the present invention.
  • the electric lamp circuit comprises a light emitting circuit 71, power source 72, bridge rectifier 73, power device 74, current detector 75, arithmetic unit 76, controller 77, ambient brightness sensor 78 and circuit regenerator 79.
  • the light emitting circuit 71 is provided with a plurality of LEDs having the same polarity and arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns.
  • the circuit regenerator 79 includes N Zener diodes having the opposite polarity to that of the LEDs in the light emitting circuit 71 and connected in series to one another and in parallel respectively to the LEDs in the respective columns. Each of the Zener diodes is adapted to, if all the LEDs of the corresponding column fail, create breakdown to transfer current to the LEDs of the subsequent column.
  • the power device 74 is adapted to perform an analog control operation or a pulse width modulation (PWM) operation with respect to an output voltage from the bridge rectifier 73 under control of the controller 77 to allow forward current to flow to the LEDs in the light emitting circuit 71 and adjust the amount of the flowing current.
  • the analog control operation may be an amplitude modulation operation.
  • An AC voltage from the power source 72 is full-wave rectified by the bridge rectifier 73 and then pulse width-modulated by the power device 74.
  • forward current flows to the LEDs in the light emitting circuit 71 to turn them on.
  • the current detector 75 detects the amount of current flowing to the light emitting circuit 71, and the arithmetic unit 76 continuously inputs the results detected by the current detector 75 for a predetermined period. The arithmetic unit 76 then obtains the average of the inputted results and outputs the obtained average to the controller 77.
  • the ambient brightness sensor 78 senses an ambient brightness of a lamp and outputs the resultant level signal to the controller 77.
  • the controller 77 then controls the power device 74 in response to the current average obtained by the arithmetic unit 76 and the ambient brightness level signal from the ambient brightness sensor 78 to adjust the amount of current flowing to the light emitting circuit 71 and, thus, a light intensity of the light emitting circuit 71.
  • the amount of current flowing to the light emitting circuit 71 is increased to make the lamp readily distinguishable.
  • the amount of current flowing to the light emitting circuit 71 is reduced, resulting in a reduction in power consumption.
  • the operation is performed in the opposite manner to that mentioned above.
  • Fig. 8 is a circuit diagram of an electric lamp circuit in accordance with a fifth embodiment of the present invention.
  • the electric lamp circuit comprises a light emitting circuit 81, power source 82, power device 83, current detector 84, arithmetic unit 85, controller 86, ambient brightness sensor 87 and circuit regenerator 88.
  • the light emitting circuit 81 is provided with a plurality of LEDs arranged in a matrix form of M rows x N columns and in such a net form that they are connected in series in respective rows and in parallel in respective columns.
  • the LEDs in a part of the rows have the same polarity and constitute a first LED group turned on for a positive (+) half period of an AC voltage supplied from the power source 82, and the
  • the circuit regenerator 88 includes N pairs of Zener diodes with the opposite polarities.
  • the N Zener diode pairs are connected in series to one another and in parallel respectively to the LEDs in the respective columns. If all the LEDs of the corresponding column fail, each of the Zener diode pairs is adapted to create breakdown to transfer current to the LEDs of the subsequent column. If the AC voltage is supplied from the power source 82, the first and second LED groups with the opposite polarities are alternately turned on for the positive (+) and negative (-) half periods of the AC voltage.
  • Fig. 9 is a sectional view of an electric lamp structure to which the present invention is applied.
  • the reference numeral 91 denotes a base which is inserted into a socket to be connected to an external power source.
  • the reference numeral 92 denotes a plurality of LEDs which emit light.
  • the reference numeral 93 denotes a plurality of connectors which interconnect the LEDs 92 in a matrix form.
  • the reference numeral 94 denotes an LED board on which the connectors 93 are mounted or an integrated circuit is printed.
  • the reference numeral 95 denotes a control circuit which controls turning-on/off of the LEDs 92.
  • the reference numeral 96 denotes an LED support which supports the LED board 94.
  • the reference numeral 97 denotes electric wires which are connected between the LED board 94 and the control circuit 95.
  • the reference numeral 98 denotes a lens which widely disperses the light emitted from the LEDs 92.
  • the reference numeral 99 denotes a lens support which is mechanically coupled between and the base 91 and the lens 98 to support the lens 98.
  • Figs. 10A and 10B are exploded perspective views illustrating an embodiment of the connectors 93 in Fig. 9 in accordance with the present invention.
  • the connectors 93 are adapted to interconnect the LEDs 92 in a matrix form.
  • N+l connectors are required to mount the LEDs 92 on the LED board 94 in a matrix form of M rows x N columns.
  • M pin holes 93C are formed on each external case 93 A to receive lead terminals of the LEDs 92 of each column, respectively.
  • Metal connection pins 93B are also inserted respectively into the pin holes 93 C to interconnect the lead terminals of the LEDs 92 in the pin holes 93C so as to arrange the LEDs in a net form.
  • the metal connection pins 93B may also discharge heat generated from the LEDs 92 in operation. If a certain one of the LEDs 92 fails in operation, the user can pull out it from the corresponding pin holes 93 C of the corresponding connector 93 and replace it with a new one. In this manner, failure repairs can simply be made.
  • Figs. 11 A and 1 IB are exploded perspective views illustrating an alternative embodiment of the connectors in Fig. 9 in accordance with the present invention, which are designated by the reference numeral 93'.
  • a net-shaped pattern 94' is printed on the LED board 94.
  • MxN connectors are required to mount the LEDs 92 on the pattern 94' of the LED board 94 in a matrix form of M rows x N columns.
  • Two pin holes 93C are formed on each external case 93 A' to receive lead terminals of each LED 92, respectively, and have therebetween the same interval as that between the lead terminals.
  • Two metal connection pins 93B' are also inserted respectively into the pin holes 93 C to individually support the lead terminals in the pin holes 93 C and connect them to the pattern 94' of the LED board 94.
  • the LEDs in the light emitting circuit are arranged in a net form. Therefore, even though a specific one of the LEDs fails, the other LEDs of the same row can normally be turned on.
  • the current detector and arithmetic unit are provided to detect an abrupt variation in the AC voltage from the power source and maintain the amount of current flowing to the light emitting circuit constantly within a predetermined range in accordance with the detected result, so as to protect the light emitting circuit from overcurrent.
  • the power device and ambient brightness sensor are provided to sense the ambient brightness of the lamp and adjust the light intensity of the light emitting circuit in accordance with the sensed result, thereby reducing power consumption.
  • each LED can be mounted on the LED board by inserting its lead terminals into the pin holes of the connectors and replaced with a new one by detaching the lead terminals from the pin holes of the connectors. Therefore, if a certain one of the LEDs in the light emitting circuit fails, it can readily be repaired.
  • a traffic signal lamp 15 is not limited to a traffic signal lamp and can be applied to a variety of lamps including a plurality of LEDs, such as a street lamp, an advertising lamp, a lighting lamp, car's tail and direction indicating lamps and other LED signal lamps.
  • a plurality of LEDs such as a street lamp, an advertising lamp, a lighting lamp, car's tail and direction indicating lamps and other LED signal lamps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un circuit de lampe électrique qui comporte un circuit (41) d'émission de lumière qui comprend plusieurs DEL (D11..DMN) aménagées dans une forme de matrice constituée de M rangées x N colonnes, une source (42) d'alimentation servant à fournir une tension de courant alternatif au circuit d'émission de lumière, et un circuit (43) de résistance variable servant à régler la quantité de courant dirigée vers le circuit (41) d'émission de lumière. Les DEL (D11..DMN) sont aménagées en forme de réseau. Par conséquent, même si une DEL (D11..DMN) spécifique ne fonctionne plus, les autres DEL de la même rangée peuvent être allumées normalement. Ainsi, la DEL qui ne fonctionne plus est facilement repérable, ce qui a pour résultat de réduire le temps de réparation des défaillances. De plus, une variation de la tension de courant alternatif est compensée de sorte que la quantité de courant dirigée vers le circuit (41) d'émission de lumière peut être maintenue dans une plage prédéterminée. Par conséquent, on peut éviter une panne du circuit (41) d'émission de lumière et prévenir une surcharge de courant en direction du circuit (41) d'émission de lumière, ce qui permet d'allonger la durée de vie du produit. En outre, une luminance ambiante de la lampe est détectée, et l'intensité lumineuse du circuit (41) d'émission de lumière est réglée en fonction du résultat détecté, ce qui permet de réduire la consommation de courant. De plus, un régénérateur (79, 88) de circuit est prévu pour transférer du courant vers les DEL de la colonne suivante si toutes les DEL d'une colonne spécifique tombent en panne, ce qui permet d'éviter une panne de fonctionnement.
PCT/KR1998/000306 1997-10-10 1998-10-08 Circuit de lampe electrique et structure utilisant des diodes electroluminescentes WO1999020085A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU94654/98A AU9465498A (en) 1997-10-10 1998-10-08 Electric lamp circuit and structure using light emitting diodes

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR2019970028064U KR19990014904U (ko) 1997-10-10 1997-10-10 Led 전등 포물망 회로
KR1997/28064U 1997-10-10
KR1019980017948A KR19990085501A (ko) 1998-05-19 1998-05-19 발광다이오드를 이용한 전등회로
KR1998/17948 1998-05-19
KR1998/22249 1998-06-15
KR1019980022249A KR100287781B1 (ko) 1998-06-15 1998-06-15 발광다이오드를이용한전등회로및전등구조

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WO1999020085A1 true WO1999020085A1 (fr) 1999-04-22

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WO2001033911A1 (fr) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. Reseau de del a structure en treillis tridimensionnelle, pour l'illumination
WO2001033910A1 (fr) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. Reseau de diodes electroluminescentes pour l'eclairage utilisant une structure moleculaire
WO2001033912A1 (fr) * 1999-11-04 2001-05-10 Koninklijke Philips Electronics N.V. Groupe de del a agencement de derivations actives
WO2001073735A3 (fr) * 2000-03-24 2001-12-20 Koninkl Philips Electronics Nv Reseau de diodes electroluminescentes (led) base sur une structure matricielle
JP2002019519A (ja) * 2000-05-24 2002-01-23 Reitter & Schefenacker Gmbh & Co Kg 車両特に自動車の特にアウトサイドバックミラー用のランプユニット
WO2001060119A3 (fr) * 2000-02-11 2002-06-20 Gerhard Abler Corps d'eclairage
WO2002039787A3 (fr) * 2000-11-09 2002-08-01 Azoteq Pty Ltd Dispositif electroluminescent
JP2003513454A (ja) * 1999-11-01 2003-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 特定可能な格子関係を有するｌｅｄアレイ
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US6650064B2 (en) 2000-09-29 2003-11-18 Aerospace Optics, Inc. Fault tolerant led display design
US6653798B2 (en) 2000-09-29 2003-11-25 Aerospace Optics, Inc. Voltage dimmable LED display producing multiple colors
US6737814B2 (en) 2000-09-29 2004-05-18 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driver
WO2004086822A1 (fr) * 2003-03-25 2004-10-07 sitronic Ges. für elektrotechnische Ausrüstung mbH & Co. KG Module d'eclairage de vehicule automobile
EP1289341A3 (fr) * 2001-08-16 2005-09-14 Hella KGaA Hueck & Co. Luminaire automobile avec circuit et plaque conductrice associés
EP1781071A1 (fr) * 2005-10-27 2007-05-02 ALCATEL Transport Solution Deutschland GmbH Régulation de l'intensité lumineuse de DELs en utilisant les caractéristiques photoélectriques desdites DELs.
DE102005053298A1 (de) * 2005-11-09 2007-05-16 Kromberg & Schubert Gmbh & Co Beleuchtungseinrichtung
US7385495B2 (en) 2004-10-18 2008-06-10 Volkswagen Ag Illumination device for vehicles and method for controlling an illumination device for vehicles
EP1460884A3 (fr) * 2003-03-19 2008-07-16 Eastman Kodak Company Source luminineuse oled série/parallèle
US7443101B2 (en) 1998-10-09 2008-10-28 Azoteq Pty Ltd. Intelligent electrical switching device including a touch sensor switch
JP2009505393A (ja) * 2005-08-08 2009-02-05 ソウル オプト デバイス カンパニー リミテッド 交流型発光素子
EP1871146A4 (fr) * 2005-02-25 2009-04-29 Murata Manufacturing Co Dispositif d'eclairage a diodes electroluminescentes
US7631559B2 (en) 2005-04-06 2009-12-15 Murata Manufacturing Co., Ltd. Acceleration sensor
US7764028B2 (en) 2007-02-28 2010-07-27 Sharp Kabushiki Kaisha LED drive circuit and LED light-emitting device
EP2230886A1 (fr) * 2009-03-19 2010-09-22 Intematix Technology Center Corp. Dispositif électroluminescent à alimentation CA
US7906915B2 (en) 2008-04-19 2011-03-15 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driving circuit
ITPI20100006A1 (it) * 2010-01-21 2011-07-22 Paolo Maria Gianoglio Torcia elettrica ad emissione di intensità luminosa auto-regolante.
JP2011181245A (ja) * 2010-02-26 2011-09-15 Rb Controls Co Ｌｅｄ照明装置
US9807827B2 (en) 2004-02-25 2017-10-31 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10091842B2 (en) 2004-02-25 2018-10-02 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
CN108738202A (zh) * 2018-07-12 2018-11-02 江苏鼎云信息科技有限公司 一种等电压均匀电路或非均匀电路、装置及其制作方法
US10154551B2 (en) 2004-02-25 2018-12-11 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10178715B2 (en) 2004-02-25 2019-01-08 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
US10349479B2 (en) 2011-12-02 2019-07-09 Lynk Labs, Inc. Color temperature controlled and low THD LED lighting devices and systems and methods of driving the same
US10499465B2 (en) 2004-02-25 2019-12-03 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
US10499466B1 (en) 2004-02-25 2019-12-03 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10575376B2 (en) 2004-02-25 2020-02-25 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US12279345B2 (en) 2009-12-28 2025-04-15 Lynk Labs, Inc. Light emitting diode and LED drive apparatus

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US7443101B2 (en) 1998-10-09 2008-10-28 Azoteq Pty Ltd. Intelligent electrical switching device including a touch sensor switch
US7498749B2 (en) 1998-10-09 2009-03-03 Azoteq Pty Ltd. Intelligent electrical switching device including a touch sensor user interface switch
JP4908710B2 (ja) * 1999-11-01 2012-04-04 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 特定可能な格子関係を有するｌｅｄアレイ
JP2003513453A (ja) * 1999-11-01 2003-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 照明用の格子構造ｌｅｄアレイ
WO2001033910A1 (fr) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. Reseau de diodes electroluminescentes pour l'eclairage utilisant une structure moleculaire
JP4908709B2 (ja) * 1999-11-01 2012-04-04 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 照明用の格子構造ｌｅｄアレイ
WO2001033911A1 (fr) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. Reseau de del a structure en treillis tridimensionnelle, pour l'illumination
JP2003513454A (ja) * 1999-11-01 2003-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 特定可能な格子関係を有するｌｅｄアレイ
WO2001033912A1 (fr) * 1999-11-04 2001-05-10 Koninklijke Philips Electronics N.V. Groupe de del a agencement de derivations actives
WO2001060119A3 (fr) * 2000-02-11 2002-06-20 Gerhard Abler Corps d'eclairage
WO2001073735A3 (fr) * 2000-03-24 2001-12-20 Koninkl Philips Electronics Nv Reseau de diodes electroluminescentes (led) base sur une structure matricielle
JP2002019519A (ja) * 2000-05-24 2002-01-23 Reitter & Schefenacker Gmbh & Co Kg 車両特に自動車の特にアウトサイドバックミラー用のランプユニット
US6737814B2 (en) 2000-09-29 2004-05-18 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driver
US6653798B2 (en) 2000-09-29 2003-11-25 Aerospace Optics, Inc. Voltage dimmable LED display producing multiple colors
US6650064B2 (en) 2000-09-29 2003-11-18 Aerospace Optics, Inc. Fault tolerant led display design
WO2002039787A3 (fr) * 2000-11-09 2002-08-01 Azoteq Pty Ltd Dispositif electroluminescent
US6828739B2 (en) 2000-11-09 2004-12-07 Azoteq (Pty) Ltd Light emitting device
EP1289341A3 (fr) * 2001-08-16 2005-09-14 Hella KGaA Hueck & Co. Luminaire automobile avec circuit et plaque conductrice associés
US6956494B2 (en) 2001-12-11 2005-10-18 Westinghouse Brake And Signal Holdings Limited Signal lamps and apparatus
SG120082A1 (en) * 2001-12-11 2006-03-28 Westinghouse Brake & Signal Signal lamps and apparatus
GB2383180B (en) * 2001-12-11 2005-05-04 Westinghouse Brake & Signal Signal lamps and apparatus
GB2383180A (en) * 2001-12-11 2003-06-18 Westinghouse Brake & Signal LED signal lamp and apparatus
EP1460884A3 (fr) * 2003-03-19 2008-07-16 Eastman Kodak Company Source luminineuse oled série/parallèle
WO2004086822A1 (fr) * 2003-03-25 2004-10-07 sitronic Ges. für elektrotechnische Ausrüstung mbH & Co. KG Module d'eclairage de vehicule automobile
US10499466B1 (en) 2004-02-25 2019-12-03 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10687400B2 (en) 2004-02-25 2020-06-16 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US11638336B2 (en) 2004-02-25 2023-04-25 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US11528792B2 (en) 2004-02-25 2022-12-13 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices
US11019697B2 (en) 2004-02-25 2021-05-25 Lynk Labs, Inc. AC light emitting diode and AC led drive methods and apparatus
US10980092B2 (en) 2004-02-25 2021-04-13 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
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US10750583B2 (en) 2004-02-25 2020-08-18 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10575376B2 (en) 2004-02-25 2020-02-25 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10517149B2 (en) 2004-02-25 2019-12-24 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10506674B2 (en) 2004-02-25 2019-12-10 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10499465B2 (en) 2004-02-25 2019-12-03 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
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US10492252B2 (en) 2004-02-25 2019-11-26 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10178715B2 (en) 2004-02-25 2019-01-08 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
US9807827B2 (en) 2004-02-25 2017-10-31 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10091842B2 (en) 2004-02-25 2018-10-02 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10154551B2 (en) 2004-02-25 2018-12-11 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US7385495B2 (en) 2004-10-18 2008-06-10 Volkswagen Ag Illumination device for vehicles and method for controlling an illumination device for vehicles
EP1871146A4 (fr) * 2005-02-25 2009-04-29 Murata Manufacturing Co Dispositif d'eclairage a diodes electroluminescentes
US7631559B2 (en) 2005-04-06 2009-12-15 Murata Manufacturing Co., Ltd. Acceleration sensor
JP2009505393A (ja) * 2005-08-08 2009-02-05 ソウル オプト デバイス カンパニー リミテッド 交流型発光素子
US8350276B2 (en) 2005-08-08 2013-01-08 Seoul Opto Device Co., Ltd. Alternating current light emitting device
EP1781071A1 (fr) * 2005-10-27 2007-05-02 ALCATEL Transport Solution Deutschland GmbH Régulation de l'intensité lumineuse de DELs en utilisant les caractéristiques photoélectriques desdites DELs.
US7508317B2 (en) 2005-10-27 2009-03-24 Alcatel Control of the luminous intensity of power LEDs by using the photoelectric effect characteristics of said power LEDs
DE102005053298A1 (de) * 2005-11-09 2007-05-16 Kromberg & Schubert Gmbh & Co Beleuchtungseinrichtung
DE102005053298B4 (de) * 2005-11-09 2012-08-16 Kromberg & Schubert Kg Beleuchtungseinrichtung
US7764028B2 (en) 2007-02-28 2010-07-27 Sharp Kabushiki Kaisha LED drive circuit and LED light-emitting device
US7906915B2 (en) 2008-04-19 2011-03-15 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driving circuit
US8450748B2 (en) 2009-03-19 2013-05-28 Interlight Optotech Corporation Solid state light emitting device
EP2230886A1 (fr) * 2009-03-19 2010-09-22 Intematix Technology Center Corp. Dispositif électroluminescent à alimentation CA
US12279345B2 (en) 2009-12-28 2025-04-15 Lynk Labs, Inc. Light emitting diode and LED drive apparatus
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