WO2016003055A1

WO2016003055A1 - Led lamp driving device

Info

Publication number: WO2016003055A1
Application number: PCT/KR2015/003333
Authority: WO
Inventors: 강신중; 김봉수; 정관옥
Original assignee: 강신중; 김봉수; 정관옥
Priority date: 2014-07-04
Filing date: 2015-04-02
Publication date: 2016-01-07
Also published as: KR20160005247A; KR101598415B1

Abstract

The present invention relates to an LED lamp driving device for stably driving an LED lamp and electrically and safely driving the LED lamp without flickering by satisfying an oscillation method condition of an electronic ballast even when a time constant of a coil and a capacitor of the electronic ballast varies. The LED lamp driving device of the present invention comprises a resonance control unit comprising: a resonance capacitor unit inserted into one of two connection terminals of the electronic ballast and provided with a third capacitor of which one end is mounted on one of two electrodes of a power input terminal and a fourth capacitor of which one end is mounted on the other one of the two electrodes of the power input terminal; a resonance switching unit provided with third and fourth transistors formed from a field-effect transistor, wherein the other end of the third capacitor is connected to the drain of the third transistor, the other end of the fourth capacitor is connected to the drain of the fourth transistor, and the sources of the third and fourth transistors are connected to the ground; and a voltage monitoring unit provided with a voltage detector, wherein the gates of the third and fourth transistors are connected to an output end (Vout) of the voltage detector, and an intermediate connection point of first and second resistors connected in series between a driving voltage (V1) and the ground is connected to an input end (Vin) of the voltage detector.

Description

LED lamp drive

The present invention, even if the time constant of the coil and the capacitor of the electronic ballast is changed, the LED lamp driving device to drive the LED lamp stably in accordance with the oscillation method conditions of the electronic ballast, so that the LED lamp is flicker-free and electrically safe, It relates to an LED lamp driving device.

Recently, a lamp using a light-emitting diode (hereinafter referred to as an LED) in place of a fluorescent lamp has emerged as a new luminaire and its use is increasing.

Conventional fluorescent lamps generate electric discharges due to high voltages inside the lamp, and the ultraviolet rays generated by the reaction react with fluorescent materials applied to the inner surface of the lamp to emit visible light. That is, when the fluorescent lamp is turned on, a high voltage is applied between the anodes. Insulation breakdown occurs and the discharge between the anodes caused by the leading edge breakdown causes electrons to collide with the fluorescent material inside the fluorescent lamp to shine.

Conventional lighting methods for fluorescent lamps include a magnetic lighting method using a magnetic ballast and an electronic lighting method using an electronic ballast, but electronic lighting methods are mainly used.

The electronic ballast used in Korea mainly uses the self-oscillating method in which the series resonance occurs by the coil, condenser and fluorescent lamp's filament inside the ballast. Is discharged between the fluorescent lamp anodes. If the resonance does not occur, it is unsafe to obtain any output, and there is a risk that the fluorescent lamp ruptures due to an increase in the current in the fluorescent lamp.

In general, a fluorescent lamp is mounted on a ceiling or the like and mounted on a luminaire body provided with an electronic ballast.

In recent years, the technique which makes it possible to mount and use an LED lamp instead of a fluorescent lamp in the luminaire body provided with an electronic ballast is desired.

However, it is very difficult to drive an LED by simply connecting an LED lamp driving device to an electronic ballast output having a characteristic of causing a discharge between fluorescent lamp anodes due to a very high voltage generated by resonance.

The circuit for driving the LED using the electronic ballast uses a resonance method, but the time constants of the coil and the capacitor of the electronic ballast differ from manufacturer to manufacturer.If the LED lamp is connected according to the product of the electronic ballast, the LED may be driven by high voltage due to resonance. In many cases, the lamp drive circuit burns or the fuse is blown and cannot be used.

In addition, when the electronic ballast is used, a circuit must be configured in accordance with the oscillation type conditions of the electronic ballast in order to ensure that the LED lamp is flicker-free and electrically safe.

Therefore, even if the time constant of the coil and the capacitor of the electronic ballast is changed, the LED lamp is stably driven, and the LED lamp driving device is driven to the oscillation method condition of the electronic ballast, so that the LED lamp is flicker-free and electrically driven. LED lamp driving device is desired.

In general, in order to implement a circuit for driving an LED lamp using an electronic ballast, the resonance phenomenon of the ballast implemented by a self-feeding or a punching oscillation method must be used. Because the discharge must be made to turn on the fluorescent lamp, a high voltage is required to discharge, and an easy way to obtain a high voltage is to use a high voltage obtained at resonance.

When driving the LED lamp using the electronic ballast made of the self-acting or punching oscillation method, the electronic ballast operates normally when the LED lamp driving circuit is configured so that the self-acting or punching oscillation is performed.

However, high frequency high voltage AC600V or more obtained by resonating by self- or oscillating oscillation method burns LED lamp driving circuit or damages LED lamp. In particular, the voltage generated by the resonance of the self- or oscillating oscillation method is different from the products of many companies, and the LED lamp driving device for driving the LED lamp by controlling the ballast with different characteristics is essential.

The electronic ballast for fluorescent lamps of Korean Patent Laid-Open Publication No. 1998-046172 is provided with two switching elements Q1 and Q2 composed of FETs at an output terminal, as shown in FIG. 1, to alternate two switching elements Q1 and Q2. The drive is repeatedly driven to generate a predetermined square wave of high frequency. The square wave is resonated by the twelfth capacitor C12 and the ninth inductor L0 provided between the connecting portions of the two switching elements Q1 and Q2 and the first terminal J1 of the fluorescent lamp. It is converted into a sinusoidal wave having a high frequency characteristic. When the sine wave is input to the zero capacitor C0, which is a starting capacitor connected between the both ends of the fluorescent lamp, that is, between the second terminal J2 and the third terminal J3 of the fluorescent lamp, the zero capacitor C0 Supplies a predetermined sinusoidal AC voltage to the fluorescent lamp. At this time, the fourth terminal J4 of the fluorescent lamp is connected to ground. In addition, an eleventh capacitor C11, which is a capacitor for removing ripple, is provided at both ends of the two switching elements Q1 and Q2, that is, the power supply terminals of the two switching elements Q1 and Q2. The ripple is smoothed by removing the ripple from the voltage applied to the power supply terminal.

In some cases, a method of omitting the twelfth capacitor C12 and converting the sine wave into resonance by the zeroth capacitor C0 and the zeroth inductor L0 may have a predetermined high frequency characteristic.

As a prior art, there is a 'controller for LED fluorescent lamp compatible with the ballast' of Korean Patent Publication No. 10-2012-0098441.

An embodiment of Korean Patent Application Laid-Open No. 10-2012-0098441 includes a capacitance capacitance selector having a plurality of capacitors connected to a resonant inductor, the capacitance capacitance selector having a selector switch to allow a user to select an appropriate capacitor. . In addition, in another embodiment of Korean Patent Publication No. 10-2012-0098441, the capacitance capacitance selection unit includes a plurality of capacitors, and a control switch corresponding to each of the plurality of capacitors, the control switch is a tri-connected in series with each capacitor And a bidirectional photodiode connected with a resistive element connected to trigger the triac, and when the photodiode is turned on, the corresponding triac is also turned on so that the corresponding capacitor is automatically selected. The photodiode is turned on or off depending on whether or not the light emitting diode for generating the driving signal, which is emitted according to the signal of the driving control unit, is emitted.

In Korean Laid-Open Patent Publication No. 10-2012-0098441, in the case of manual, it is difficult for the user to select an appropriate capacitor, and even in the case of automatic driving, the driving controller detects the LED driving voltage and selects a capacitor accordingly. A predetermined light emitting diode for generating a signal is emitted, and a predetermined photodiode and a predetermined triac are turned on to select a predetermined capacitor according to the light emitting diode. However, a driving controller, a light emitting diode, a photodiode, a triac, etc. are separately provided. It is composed of complex circuits, and in every case, it is configured to be selectively driven according to each, so that there are many restrictions on the configuration and driving of the circuits, and thus there is a possibility of malfunction.

Therefore, the present invention is to drive the LED lamp stably even if the time constant of the coil and the capacitor of the electronic ballast is changed, the LED lamp driving device is made to be driven in accordance with the oscillation method conditions of the electronic ballast, the LED lamp is flickering and electrically An LED lamp driving device for driving safely is proposed.

The problem to be solved by the present invention is that even if the time constant of the coil and the capacitor of the electronic ballast is changed, the LED lamp driving device to drive the LED lamp stably in accordance with the oscillation method conditions of the electronic ballast, the LED lamp is flickering and electrically To provide a safe driving LED lamp.

In order to solve the above problems, the LED lamp driving apparatus of the present invention, the third capacitor, one end is mounted to one of the two electrodes of the power input terminal, which is inserted into one of the two connection terminals of the electronic ballast. And a fourth capacitor having one end mounted on the other one of the two electrodes of the power input terminal. A third transistor and a fourth transistor comprising a field effect transistor, the other end of the third capacitor is connected to the drain of the third transistor, the other end of the fourth capacitor is connected to the drain of the fourth transistor, and a third transistor A source of the transistor and the fourth transistor includes a resonance switching unit connected to ground; A first resistor having a voltage detector, a gate of the third transistor and a fourth transistor connected to an output terminal Vout of the voltage detector, and a first resistor connected in series between the driving voltage V1 and ground to an input terminal Vin of the voltage detector; And a resonance control unit including a voltage monitoring unit connected to an intermediate connection point of the second resistor.

In addition, in the LED lamp driving apparatus of the present invention, the first electrode and the second electrode of the first power input terminal inserted into the first connection terminal of the electronic ballast are connected to each other and short-circuited. It is connected in series, the connection point of the first diode and the second diode is connected to the connection point of the first electrode and the second electrode, one side of the first diode and the second diode connected in series is connected to the ground, the first diode A first capacitor mounted in parallel with the first capacitor and mounted with a second capacitor in parallel with the second diode; A rectifying unit comprising: a second rectifying unit forming a bridge circuit between three diodes and sixth diodes, which are four diodes, between the third electrode and the fourth electrode of the second power input terminal inserted into the second connection terminal of the electronic ballast; Characterized in that comprises a.

The power input terminal includes a first power input terminal having a first electrode and a second electrode inserted into a first connection terminal of the electronic ballast, and a second connection terminal of the electronic ballast having a third electrode and a fourth electrode. It may be one of the second power input terminal inserted into the.

The power input terminal is a second power input terminal, and the first electrode and the second electrode of the first power input terminal are connected to each other and short-circuited.

The first fuse is mounted between the connection point of the first electrode and the second electrode and the first rectifying part.

The LED lamp driving apparatus, the two capacitors having a polarity in parallel, between the rectifier output terminal and the ground, the smoothing portion; A PWM driver comprising a dedicated driving element for pulse width modulation control and a fifth transistor, which is a field effect transistor, are included. The LED control signal consisting of a pulse train is output from the output terminal of the PWM driver according to the driving voltage V1. And an LED lamp driving unit which outputs the LED control signal to the gate of the fifth transistor and switches the fifth transistor according to the LED control signal to drive the LED unit.

According to the LED lamp driving device of the present invention, even if the time constant of the coil and the capacitor of the electronic ballast is changed, the LED lamp driving device drives the LED lamp stably in accordance with the oscillation method conditions of the electronic ballast, and the LED lamp does not flicker. Drive safely safely.

1 is a circuit diagram showing the configuration of a fluorescent lamp lighting apparatus equipped with an electronic ballast for fluorescent lamps of Korean Laid-Open Patent Publication No. 1998-046172.

2 is a circuit diagram of a resonance control unit of the LED lamp driving apparatus according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining a resonance controller of FIG. 2 in connection with an electronic ballast.

4 is a circuit diagram of a rectifying part of the LED lamp driving apparatus according to an embodiment of the present invention.

FIG. 5 is an example of an LED lamp driving apparatus to which the resonance controller of FIG. 2 is applied.

LED lamp driving apparatus according to the present invention, even if the time constant of the coil and the capacitor of the electronic ballast is changed, in accordance with the oscillation system conditions of the electronic ballast, to stably drive the LED lamp, so that the LED lamp is flicker-free and electrically safe As shown in FIG. 5, the first power input terminal 10, the second power input terminal 20, the rectifying unit 30, the resonance control unit 45, the smoothing unit 47, and the LED lamp driving unit 80. ), Including the LED unit 90.

As shown in FIG. 2, the resonance control unit 45 includes a resonance capacitor unit 50, a resonance switching unit 60, and a voltage monitoring unit 70 so that the voltage monitoring unit 70 has a low voltage. When the voltage falls below the value (reference voltage), the electronic ballast operates the resonance switching unit 60 to oscillate, and the oscillation circuit is connected through the resonance capacitor unit 50 to achieve resonance. When the fifth capacitor C5 and the sixth capacitor C6 of the smoothing unit 47 are charged and the charged voltage is higher than the voltage set by the voltage monitoring unit 70, the oscillation is turned off so that the oscillation stops. The operation to stop the operation is continuously performed so that the driving voltage V1 is constant so that the LED lamp driving unit 80 is driven at a safe voltage.

Hereinafter, with reference to the accompanying drawings, the LED lamp driving apparatus according to the present invention will be described in detail.

2 is a circuit diagram of a resonance control unit of the LED lamp driving apparatus according to an embodiment of the present invention, Figure 3 is an explanatory diagram for explaining the resonance control unit of Figure 2 in connection with the electronic ballast.

The resonance controller 45 includes a resonance capacitor unit 50, a resonance switching unit 60, and a voltage monitoring unit 70.

The resonant capacitor unit 50 is a capacitor mounted to each of the third electrode J3 and the fourth electrode J4 of the second power input terminal 20, and is connected in series with the electronic ballast to resonate with the electronic ballast. That is, the resonant capacitor unit 50 is connected to the zero capacitor C0 and the zero inductor L0 of the electronic ballast to resonate. The third capacitor C3, which is a resonance capacitor, is mounted to the third electrode J3, and the fourth capacitor C4, which is a resonance capacitor, is mounted to the fourth electrode J4. At this time, the first electrode J1 and the second electrode J2 of the first power input terminal 10 are connected to each other and shorted.

Here, the first power input terminal 10 and the second power input terminal 20 are terminals for receiving AC power from an electronic ballast of an existing fluorescent lighting system. The first power input terminal 10 is the first electrode J1 and the second electrode J2 for connecting to the electrodes S1 and S2 of the first connection terminal 11 of the conventional fluorescent lighting system (electronic ballast), respectively. And a second power input terminal 20 for connecting to electrodes S3 and S4 of the second connection terminal 21 of the conventional fluorescent lighting system (electronic ballast), and The fourth electrode J4 is provided. The first power input terminal 10 and the second power input terminal 20 may be referred to as a power input unit.

The resonance switching unit 60 is a switching means for turning resonance on and off, and is controlled by the instruction of the voltage monitoring unit 70. The resonance switching unit 60 is composed of two switching elements, that is, the third transistor Q3 and the fourth transistor Q4, and the third transistor Q3 and the fourth transistor Q4 are field effect transistors (hereinafter referred to as FETs). Drain D is connected to the resonant capacitors C3 and C4, the source S is connected to ground, and the gate G is connected to the output terminal Vout of the voltage detector 72. Connected. Accordingly, the gate G is turned on and off in accordance with the output of the voltage detector 72, and the drain D and the source (B) are turned on as the gate G is turned on and off. S) is connected or not connected, so resonance may or may not occur.

The voltage monitoring unit 70 monitors the driving voltage V1. When the voltage rises excessively due to resonance, the resonance switching unit is turned off to lower the driving voltage V1, and the driving voltage V1 is too low. In this difficult case, the resonance control switching unit is turned on to cause the electronic safety device to resonate.

Here, the driving voltage V1 is output by full-wave rectifying the AC voltage input from the power

supply input units

10 and 20 in the rectifying unit 30, and is a voltage for driving the LED unit 90. Therefore, the driving voltage V1 may be referred to as an LED driving voltage.

The voltage monitoring unit 70 connects an intermediate connection point 74 of the first resistor R1 and the second resistor R2 connected in series between the driving voltage V1 and the ground to the input terminal Vin of the voltage detector 72. The output terminal Vout of the voltage detector 72 is connected to each of the third transistor Q3 and the gate G of the fourth transistor Q4 of the resonance switching unit 60, and also the voltage detector 72. The output terminal of is connected to the driving voltage V1 through the third resistor R3. The voltage detector 72 may be made of a commercially available voltage detector element.

In other words, when the voltage detector 72 receives a voltage (that is, a voltage proportional to the driving voltage V1) to the input terminal Vin, and the input voltage is greater than the preset reference voltage (set voltage), the voltage detector 72 receives the first voltage. A voltage (for example, 0 V) is output to the output terminal Vout, and if the input voltage is less than or equal to a preset reference voltage, a second voltage (for example, 5 V) is output to the output terminal Vout. In this case, the first voltage is a voltage for turning off the third transistor Q3 and the fourth transistor Q4, and the second voltage is a voltage for turning on the third transistor Q3 and the fourth transistor Q4.

If the driving voltage V1 rises excessively due to resonance and the voltage proportional to the driving voltage V1 inputted to the input terminal Vin of the voltage detector 72 is greater than the predetermined reference voltage, the first voltage ( For example, 0V is output to the output terminal Vout. Accordingly, the third transistor Q3 and the fourth transistor Q4 are turned off, so that resonance does not occur, and the driving voltage V1 falls.

If the driving voltage V1 becomes too low, if the voltage proportional to the driving voltage V1 input to the input terminal Vin of the voltage detector 72 is less than or equal to the preset reference voltage, the second voltage For example, 5V is output to the output terminal Vout, and accordingly, the third transistor Q3 and the fourth transistor Q4 are turned on, so that resonance occurs, and the driving voltage V1 is raised.

4 is a circuit diagram of a rectifying unit of the LED lamp driving apparatus according to an embodiment of the present invention.

In the rectifier 30, the first electrode J1 and the second electrode J2 of the first power input terminal 10 are connected to each other and shorted, and the first electrode J1 and the second electrode ( The first rectifying part 32 is attached to the connection point 12 of J2, and in some cases, between the connection point 12 of the first electrode J1 and the second electrode J2 and the first rectifying part 32. The first fuse F1 may be installed. For convenience of description, the first fuse F1 is omitted and described.

In addition, the rectifier 30 connects the bridge circuit with the third diodes D3 to the sixth diode D6 between the third electrode J3 and the fourth electrode J4 of the second power input terminal 10. Including the second rectifying section 34, the AC power input from the second power input terminal 20 is full-wave rectified.

The first rectifier 32 rectifies AC power input from the first power input terminal 10 as a double voltage rectifier circuit. The first rectifying unit 32 is connected to the first diode D1 and the second diode D2 in series, and the connection point between the first diode D1 and the second diode D2 is the first electrode J1. It is connected to the connection point 12 of the second electrode (J2), one side (anode end) of the first diode (D1) and the second diode (D2) connected in series is connected to the ground. The first capacitor C1 is mounted in parallel with the first diode D1, and the second capacitor C2 is mounted in parallel with the second diode D2.

The second rectifying unit 34 has a fifth diode D5 and a sixth diode D6 connected in series, and a connection point between the fifth diode D5 and the sixth diode D6 is connected to the third electrode J3. One side (anode end) of the fifth diode D5 and the sixth diode D6 connected in series is connected to the ground. In addition, the third diode D3 and the fourth diode D4 are connected in series, and the connection point of the third diode D3 and the fourth diode D4 is connected to the fourth electrode J4 and is connected in series. One side (anode end) of the third diode D3 and the fourth diode D4 is connected to ground.

The other end (cathode end) of the first diode D1 and the second diode D2 connected in series, the other end (cathode end) of the third diode D3 and the fourth diode D4 connected in series, and in series The other end (cathode end) of the connected fifth diode D5 and the sixth diode D6 is connected to one point, which is an output terminal 37 of the rectifying unit 30, and is connected to the smoothing unit 47. In some cases, the second fuse F2 may be positioned between the output terminal 37 of the rectifying unit 30 and the smoothing unit 47. For convenience of description, the second fuse F2 will be omitted.

FIG. 5 is an example of the LED lamp driving apparatus to which the resonance control unit of FIG. 2 is applied, and includes a first power input terminal 10, a second power input terminal 20, a rectifier 30, a resonance control unit 45, and a smoothing unit ( 47), the LED lamp driving unit 80, the LED unit 90 is made.

Since the first power input terminal 10, the second power input terminal 20, the resonance controller 45, and the rectifier 30 are the same as those of FIGS. 2 to 4, detailed descriptions thereof will be omitted.

The smoothing unit 47 includes a capacitor having one or more polarities to smooth the AC power supplied from the rectifying unit output stage 37. A capacitor having two polarities, that is, a fifth capacitor C5 and a sixth capacitor C6, is connected between the rectifier output terminal 37 and ground. The fifth capacitor C5 and the sixth capacitor C6 are capacitors having a high frequency high voltage polarity, and electrolytic capacitors, tantalum capacitors, and the like can be used. In addition, the smoothing unit 47 may further include a varistor SVR1 to protect the devices from being broken due to sparks and surges. Here, the rectifier output terminal 37, that is, the output terminal of the smoothing unit 47 is used as the driving voltage V1.

The LED lamp driver 80 is a means for driving the LEDs of the LED unit 90. The LED lamp driver 80 includes a PWM driver 100 and a fifth transistor Q5 which is a field effect transistor (FET), and the driving voltage V1. ) Outputs an LED control signal consisting of a pulse train from the output terminal GATE of the PWM driver 100, and the LED control signal is transmitted to the gate G of the fifth transistor Q5, thereby controlling the LED control signal. As a result, the fifth transistor Q5 switches to drive the LED unit 90. Here, the PWM driver 100 is composed of a dedicated drive IC (PWM-IC) or LED drive IC for the pulse width modulation control.

The power input terminal VIN of the PWM driver 100 is connected to the driving voltage V1.

The seventh resistor R7 is connected between the oscillation frequency adjusting resistor terminal ROSC of the PWM driver 100 and the ground.

The output terminal GATE of the PWM driver 100 is connected to the gate G of the fifth transistor Q5.

The fifth resistor R5 and the fourth resistor R4 are connected in parallel between the source S of the fifth transistor Q5 and the ground, and the source S and the PWM driver of the fifth transistor Q5 are connected to each other. The sixth resistor R6 is connected to the current sensing terminal CS of the terminal 100. In addition, a seventh capacitor C7 is connected between the current sensing terminal CS and the ground to protect the current sensing terminal CS.

The first coil L1 is connected between the drain D of the fifth transistor Q5 and one end of the LED unit 90, that is, between the cathode terminal 92 of the LEDs of the LED unit 90, and the fifth coil L1. An eighth diode D8 is connected between the drain D of the transistor Q5 and the driving voltage V1, and an anode of the eighth diode D8 is connected to the drain D of the fifth transistor Q5. The cathode of the eighth diode D8 is connected to the driving voltage.

The other end of the LED unit 90, that is, the anode terminal 94 of the LEDs of the LED unit 90 is connected to the driving voltage V1. In addition, a ninth capacitor C9 for protecting the LED unit 90 is mounted between the cathode end 92 and the anode end 94 of the LED unit 90.

In FIG. 5, the LED unit 90 is shown as having only one LED, but this is shown for convenience, and thus it is not intended to limit the present invention. LED unit 90 may be composed of a plurality of LEDs.

The present invention provides a resonance comprising a voltage monitoring unit 70, a resonance switching unit 60, and a resonance capacitor unit 50 for voltage control obtained by oscillation of an electronic ballast required for driving an LED using an electronic ballast. The controller 45 is provided to generate an LED driving voltage.

As shown in FIG. 2, the resonance control unit 45 of the present invention uses the resonance switching unit 60 to cause the electronic ballast to oscillate when the voltage monitoring unit 70 has a low voltage and falls below a set voltage value (reference voltage). The oscillation circuit is connected to the oscillation circuit through the resonant capacitor unit 50 to perform resonance, and the fifth capacitor C5 and the sixth capacitor C6 of the smoothing unit 47 are charged and charged with the high voltage obtained during resonance. If the set voltage is higher than the voltage set by the voltage monitoring unit 70, the oscillation stops and the operation of turning off the resonance switching unit 60 to stop the oscillation is performed continuously so that the driving voltage V1 is constant and the LED lamp driving unit 80 Drive at a safe voltage.

The resonance controller 45 of the present invention connects (shorts) the first terminal J1 and the second terminal J2 of the first power input terminal 10 to each other, and the third of the second power input terminal 20. The electrode J3 is connected to the drain D of the third transistor Q3 via the third capacitor C3, which is a resonance capacitor, and the fourth electrode J4 of the second power input terminal 20 is for resonance. The fourth capacitor C4, which is a capacitor, is connected to the drain D of the fourth transistor Q4, the source S of the third transistor Q3 and the fourth transistor Q4 is connected to ground, and The gate G of the third transistor Q3 and the fourth transistor Q4 is connected to the output terminal Vout of the voltage detector 72, and the driving voltage V1 is connected to the input terminal Vin of the voltage detector 72. The middle connection point 74 of the first resistor R1 and the second resistor R2 connected in series between the grounds is connected, and the output terminal Vout of the voltage detector 72 is connected to the driving voltage through the third resistor R3. A third transistor Q3 connected to V1) and formed of a FET; And the resonance (oscillation) is turned on and off using the fourth transistor Q4.

According to the present invention, the voltage of the LED lamp driving unit 80, that is, the driving voltage V1 is divided by the first resistor R1 and the second resistor R2 and inputted to the voltage detector 72 to input the voltage detector 72. The third transistor Q3 and the fourth transistor Q4 are turned on or off in accordance with the output of the power supply, and the voltage monitoring unit 70 monitors the voltage.

The present invention is provided with a resonant capacitor unit 50 for determining the oscillation frequency of the drive voltage V1 even if the time constants of the coil and the capacitor of the electronic ballast are varied, so that the LED lamp can be stably maintained in accordance with the oscillation system conditions of the electronic ballast. Drive it.

In the rectifying unit 30 of the present invention, the first electrode J1 and the second electrode J2 of the first power input terminal 10 are connected to each other and shorted, and the first electrode J1 and the second electrode are shorted. At the connection point 12 of the electrode J2, a first rectifying part 32 constituting a double voltage rectifying circuit is formed by the first diode D1 and the second diode D2, and the second power input terminal 10 is provided. And a second rectifying portion 34 bridged by a third diode D3 to a sixth diode D6 between the third electrode J3 and the fourth electrode J4 of the first electrode. The first fuse F1 is mounted between the connection point 12 of the J1 and the second electrode J2 and the first rectifying part 32. This connection simplifies the circuit, reducing the cost of fuses and rectifier diode elements.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Therefore, the spirit of the present invention should be grasped only by the claims set out below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

The present invention is applied to an LED lamp driving device in which the LED lamp driving device drives the LED lamp stably in accordance with the oscillation system conditions of the electronic ballast even if the time constants of the coil and the capacitor of the electronic ballast are changed.

Claims

A third capacitor having one end mounted on one of the two electrodes of the power input terminal inserted into one of the two connection terminals of the electronic ballast, and one end of the other electrode of the two electrodes of the power input terminal A resonant capacitor part, comprising a fourth capacitor mounted thereon;

A third transistor and a fourth transistor comprising a field effect transistor, the other end of the third capacitor is connected to the drain of the third transistor, the other end of the fourth capacitor is connected to the drain of the fourth transistor, and a third transistor A source of the transistor and the fourth transistor includes a resonance switching unit connected to ground;

A first resistor having a voltage detector, a gate of the third transistor and a fourth transistor connected to an output terminal Vout of the voltage detector, and a first resistor connected in series between the driving voltage V1 and ground to an input terminal Vin of the voltage detector; A voltage monitoring unit connected to an intermediate connection point of the second resistor;

LED lamp driving device, characterized in that comprises a resonance control unit made of.
The first electrode and the second electrode of the first power input terminal inserted into the first connection terminal of the electronic ballast are connected to each other and short-circuited, and the first diode and the second diode are connected in series, and the first diode and the second diode are connected in series. The connection point of the diode is connected to the connection point of the first electrode and the second electrode, one side of the first diode and the second diode connected in series is connected to the ground, and the first capacitor is mounted in parallel with the first diode, A first rectifying unit comprising a second capacitor mounted in parallel with the two diodes;

A second rectifying unit forming a bridge circuit with three diodes to sixth diodes, which are four diodes, between the third electrode and the fourth electrode of the second power input terminal inserted into the second connection terminal of the electronic ballast;

LED lamp driving device, characterized in that it comprises a rectifier made of.
The method of claim 1, wherein the power input terminal

A first power input terminal having a first electrode and a second electrode inserted into the first connection terminal of the electronic ballast, and a second power supply having a third electrode and a fourth electrode inserted into the second connection terminal of the electronic ballast LED lamp driving device characterized in that one of the input terminals.
The method of claim 3,

The power input terminal is a second power input terminal,

LED lamp driving device, characterized in that the first electrode and the second electrode of the first power input terminal is connected to each other and short-circuited.
The method of claim 2,

The LED lamp driving device, characterized in that the first fuse is mounted between the connection point of the first electrode and the second electrode and the first rectifying portion.
The method of claim 4, wherein

The first diode and the second diode is connected in series, the connection point of the first diode and the second diode, the connection point of the first electrode and the second electrode is connected, one side of the first diode and the second diode connected in series A first rectifier connected to a ground and having a first capacitor mounted in parallel with the first diode, and a second capacitor mounted in parallel with the second diode;

A second rectifying unit forming a bridge circuit with three diodes to sixth diodes, which are four diodes, between the third electrode and the fourth electrode of the second power input terminal inserted into the second connection terminal of the electronic ballast;

LED lamp driving device, characterized in that further comprises a rectifier made of.
The method of claim 5,

A resonant capacitor unit including a third capacitor having one end mounted on the third electrode and a fourth capacitor having one end mounted on the fourth electrode;

A third transistor and a fourth transistor comprising a field effect transistor, the other end of the third capacitor is connected to the drain of the third transistor, the other end of the fourth capacitor is connected to the drain of the fourth transistor, and a third transistor A source of the transistor and the fourth transistor includes a resonance switching unit connected to ground;

A first resistor having a voltage detector, a gate of the third transistor and a fourth transistor connected to an output terminal Vout of the voltage detector, and a first resistor connected in series between the driving voltage V1 and ground to an input terminal Vin of the voltage detector; A voltage monitoring unit connected to an intermediate connection point of the second resistor;

LED lamp driving device, characterized in that comprises a resonance control unit made of.
The method according to any one of claims 6 to 7,

A smoothing part formed by connecting two polarizing capacitors in parallel, between the rectifying part output end and ground;

A PWM driver comprising a dedicated driving element for pulse width modulation control and a fifth transistor, which is a field effect transistor, are included. The LED control signal consisting of a pulse train is output from the output terminal of the PWM driver according to the driving voltage V1. An LED lamp driving unit configured to output the LED unit control signal to a gate of the fifth transistor, and switch the fifth transistor according to the LED unit control signal to drive the LED unit;

LED lamp driving device, characterized in that further comprises.