WO2018157345A1

WO2018157345A1 - Led lamp and led brightness regulation circuit

Info

Publication number: WO2018157345A1
Application number: PCT/CN2017/075427
Authority: WO
Inventors: 周峰; 杨林; 杨仕军; 杨海涛
Original assignee: 深圳市豪恩光电照明股份有限公司
Priority date: 2017-03-02
Filing date: 2017-03-02
Publication date: 2018-09-07
Also published as: CN107006094B; CN107006094A

Abstract

Disclosed are an LED lamp and a regulation circuit therefor, which are applicable to the technical field of electronics. The regulation circuit for an LED lamp is connected between a constant-voltage power supply and an LED load. The regulation circuit comprises: a dimming unit, a voltage-switching unit and a constant current unit, wherein the dimming unit outputs a second direct current to the constant current unit according to a first direct current provided by the constant-voltage power supply, so that the constant current unit carries out constant-current driving on the LED load; and when the LED load is dimmed, the voltage-switching unit regulates a voltage of the second direct current, or, the dimming unit regulates the voltage of the second direct current according to a received dimming signal, or, after the voltage-switching unit regulates the voltage of the second direct current, the dimming unit regulates the voltage of the second direct current according to the received dimming signal, thereby enriching the modes for regulating the brightness of the LED load.

Description

LED lamps and LED brightness adjustment circuit

Technical field

[0001] The present invention belongs to the field of electronic technologies, and in particular, to an LED lamp and an adjustment circuit thereof.

Background technique

[0002] With the improvement of people's quality, more and more people are beginning to support and promote energy-saving and environmentally friendly lifestyles.

LED (Light Emitting Diode) is one of the recognized energy-saving lighting devices on the market. Although the existing LED lamps can realize the brightness control of the LED lamps by remote control or manual, etc., they are all realized by changing the PWM signal.

[0003] In summary, the existing LED luminaire has a problem that the brightness adjustment mode is single.

technical problem

Embodiments of the present invention provide an LED lamp and an adjustment circuit thereof, which aim to solve the problem that the existing LED lamp has a single brightness adjustment mode.

Problem solution

Technical solution

[0005] An object of the present invention is to provide an adjustment circuit for an LED lamp, which is connected between a constant voltage power source and an LED load, and the adjustment circuit includes: a dimming unit, a voltage switching unit, and a constant current unit;

[0006] The dimming unit outputs a second direct current to the constant current unit according to the first direct current provided by the constant voltage power source, so that the constant current unit performs constant current driving on the LED load;

[0007] After dimming the LED load, the voltage switching unit adjusts a voltage of the second direct current;

Or the dimming unit adjusts the voltage of the second direct current according to the received dimming signal; or

[0009] After the voltage switching unit adjusts the voltage of the second direct current, the dimming unit adjusts the voltage of the second direct current according to the received dimming signal.

[0010] Another aspect of the present invention provides a LED lamp, including an LED load,

The LED luminaire also includes an adjustment circuit for the LED luminaire as described above. Advantageous effects of the invention

Beneficial effect

[0011] The invention provides an LED lamp adjusting circuit connected between a constant voltage power source and an LED load, the adjusting circuit comprises: a dimming unit, a voltage switching unit and a constant current unit; the dimming unit is according to a constant voltage power supply The first direct current is supplied to the constant current unit to output the second direct current to enable the constant current unit to drive the LED load in a constant current; after dimming the LED load, the voltage switching unit adjusts the voltage of the second direct current; The light unit adjusts the voltage of the second direct current according to the received dimming signal; or after the voltage switching unit adjusts the voltage of the second direct current, the dimming unit applies the second direct current according to the received dimming signal. The voltage is adjusted to enrich the way the LED load is adjusted. Brief description of the drawing

DRAWINGS

1 is a schematic structural diagram of an adjustment circuit of an LED lamp according to an embodiment of the present invention;

2 is a specific circuit diagram of an adjustment circuit of an LED lamp according to an embodiment of the present invention;

3 is a schematic structural diagram of an LED lamp provided by an embodiment of the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0016] The embodiment of the invention provides an LED lamp and an adjustment circuit thereof, and aims to solve the problem that the existing LED lamp has a single brightness adjustment mode.

[0017] The implementation of the present invention is described in detail below with reference to specific embodiments:

1 shows the structure of an adjustment circuit of an LED lamp according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

[0019] As shown in FIG. 1, an adjustment circuit 100 for an LED lamp is connected between a constant voltage power source 110 and an LED load 120 for adjusting the brightness of the LED load 120. The adjustment circuit 100 of the LED lamp includes: a dimming unit 10, a voltage switching unit 20, and a constant current unit 30. [0020] The dimming unit 10 outputs the second direct current to the constant current unit 30 according to the first direct current supplied from the constant voltage power source 110.

, so that the constant current unit 30 performs constant current driving on the LED load.

[0021] After the LED load 120 is dimmed, the voltage switching unit 20 adjusts the voltage of the second direct current.

Or the dimming unit 10 adjusts the voltage of the second direct current according to the received dimming signal; or after the voltage switching unit 20 adjusts the voltage of the second direct current, the dimming unit 10 according to the received dimming The signal regulates the voltage of the second direct current.

[0022] It should be noted that the voltage switching unit 20 may include multiple loads, and the voltage switching unit 20 selects loads of different resistance values, thereby reducing or increasing the voltage of the signal output end of the dimming unit 10, thereby implementing the second direct current. The choice or switching of the voltage size.

[0023] Further, as shown in FIG. 1, the adjustment signal input end 11 of the dimming unit 10 is used to input an adjustment signal, and the voltage input end of the dimming unit 10 is connected to the first output end of the constant voltage power supply 110, and the constant current is connected. The voltage input end of the unit 30 is connected to the second output end of the constant voltage power supply 110. The signal output end of the dimming unit 10 and the output end of the voltage switching unit 20 are connected to the signal input end of the constant current unit 30, and the constant current unit 30 A signal output is coupled to the first end of the L ED load 120, and a second signal output of the constant current unit 30 is coupled to the second end of the LED load 120.

[0024] It should be noted that the selected dimming signals may also be different according to different brightness requirements.

[0025] The voltage input end of the constant current unit 30 is connected to the second output end of the constant voltage power source 110, and the constant voltage power source 110 supplies the third direct current to the constant current unit 30 as the working power of the constant current unit 30.

The first signal output end of the constant current unit 30 is connected to the first end of the LED load 120, and the second signal output end of the constant current unit 30 is connected to the second end of the LED load 120, wherein the output current of the constant current unit 30 for sure.

[0027] It can be understood that when the dimming unit 10 outputs the second direct current to the constant current unit 30 according to the first direct current, the voltage of the signal input terminal of the constant current unit 30 is further changed by the voltage switching unit 20, because the constant current unit 30 The current output to the LED load 120 is a constant value, so when the voltage at the signal input terminal of the constant current unit 30 changes 吋, in order to keep the current output from the constant current unit 30 to the LED load 120 unchanged, the input of the constant current unit 30 is second. The power level of the direct current also changes with the voltage change of the signal input terminal of the constant current unit 30, that is, the voltage of the output end of the dimming unit is changed by switching the voltage switching unit 20 to realize the selection of the power level of the second direct current.

[0028] When the power of the second direct current is determined, the power of the second direct current is changed by connecting different adjustment signals. The magnitude of the voltage, in turn, causes the magnitude of the current of the second direct current to vary with the magnitude of the voltage of the second direct current to effect dimming of the LED load 120.

[0029] It should be noted that the adjustment signal may include adjusting the voltage signal or the PWM switching frequency signal, and connecting the different regulated voltage signals or the PWM switching frequency signals, thereby changing the voltage of the second direct current, due to the second direct current The power has been determined, so dimming of the LED load 120 is achieved by varying the magnitude of the voltage of the second direct current, thereby changing the magnitude of the current that changes the second direct current.

2 shows a specific circuit of an adjustment circuit of an LED lamp provided by an embodiment of the present invention. As shown in FIG. 2, the dimming unit 10 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first bypass transistor Q1, and a first diode D1. And a first capacitor C1.

[0031] The first end of the first resistor R1 is a voltage input end of the dimming unit, and the second end of the first resistor R1 and the first end of the second resistor R2 are connected to the high potential end of the first bypass transistor Q1. The first end of the second resistor R2 and the first end of the first diode D1 are connected to the controlled end of the first switch Q1, and the controlled end of the first switch Q1 is the adjustment signal of the dimming unit 10. At the input end, the second end of the first diode D1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, the low potential end of the first bypass transistor and the third resistor R3 The first end of the third resistor R3 and the first end of the first capacitor C1 are connected to the first end of the fifth resistor R5, and the first end of the fifth resistor R5 is the signal output end of the dimming unit 10, The second end of the first capacitor C1 is co-grounded with the second end of the fifth resistor R5.

[0032] It should be noted that, when the constant voltage power supply 110 supplies the first direct current power to the dimming unit 10, the first direct current passes through the first resistor R1 and the second resistor R2, and then flows into the first bypass tube Q1, and then the first The low potential end of the bypass tube Q1 flows out to form a loop with the controlled end of the first bypass tube Q1. The voltage value of the first direct current is changed by the tube voltage drop of the first bypass tube Q1, and then divided by the third resistor R3 and the fifth resistor R5, and then outputted by the signal output end of the dimming unit 10.

[0033] Further, as shown in FIG. 2, the voltage switching unit 20 includes: a plurality of switching resistors (Rn, Rn+1, ..., Rm) and a load selection switch SW1.

[0034] The load selection switch SW1 includes at least one no-load terminal DIM and a plurality of load connection terminals, and the load-selectable no-load terminal DIM is an output end of the voltage switching unit 20, and a plurality of switching resistors (Rn, Rn+1. The first end of ..... Rm) is connected to the plurality of load connections of the load selection switch SW1, and the second ends of the plurality of switching resistors (Rn, R n+1 ... Rm) Ground. [0035] It should be noted that, since the signal output end of the dimming unit 10 and the output end of the voltage switching unit 20 are connected to the signal input end of the constant current unit 30, when the load selection switch SW1 is selected, the load selection is selected. The closed no-load terminal is connected to any of a plurality of switching resistors (Rn, Rn+1...Rm) such that a plurality of switching resistors (Rn, Rn+1...Rm) Either resistor forms a parallel relationship with the fifth resistor R5 in the dimming unit 10.

[0036] For example, if the voltage value of the first direct current is 10V, the voltage drop of the first bypass tube Q1 is 0.6V, and when the constant voltage power supply 110 supplies the first direct current to the dimming unit 10, the first closed circuit The voltage between the low potential end of Q1 and ground is Verf=10V-0.6V=9.4V.

[0037] When the toggle selection SW1 to the no-load terminal DIM吋, the voltage Verf between the low-potential terminal of the first bypass transistor Q1 and the ground is divided by the third resistor R3 and the fifth resistor R5. The second direct current is such that the voltage of the second direct current is VI, wherein Vl=VerfxR5/(R3+R5); wherein, Verf is a voltage value between the low potential end of the first bypass transistor Q1 and the ground, and R5 is The resistance value of the fifth resistor R5, and R3 is the resistance value of the third resistor R3.

[0038] When the toggle selection switch SW1 to the switching resistor Rn terminal 吋, the voltage Verf between the low potential end of the first bypass transistor Q1 and the ground is composed of the third resistor R3 and the fifth resistor R5 and the switching resistor Rn. The parallel network is divided to obtain a second direct current, so that the voltage of the second direct current is Vn, where Vn=Verfx (R5//R n) I (R3+R5//Rn); wherein, Verf is the first The voltage value between the low potential end of the bypass transistor Q1 and the ground, (R5//Rn) is the resistance value of the parallel network composed of the fifth resistor R5 and the switching resistor Rn, and R3 is the resistance value of the third resistor R3.

[0039] Similarly, when the toggle load selects the switch SW1 to the switching resistor Rm terminal, the voltage Verf between the low potential end of the first bypass transistor Q1 and the ground is switched by the third resistor R3 and the fifth resistor R5. A parallel network composed of a resistor Rm is divided to obtain a second direct current, so that the voltage of the second direct current is Vm, where Vm=Ve rfx (R5//Rm) I (R3+R5//Rm); wherein, Verf The voltage value between the low potential end of the first switch Q1 and the ground, (R5//Rm) is the resistance value of the parallel network composed of the fifth resistor R5 and the switching resistor Rm, and R3 is the resistance of the third resistor R3. value.

[0040] Further, the constant current unit 30 includes: a first chip U1, a first inductor L1, a second inductor L2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor. R10, the eleventh resistor Rl l, the twelfth resistor R12, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 The sixth capacitor C6 and the seventh capacitor C7.

[0041] The first end of the second diode D2 and the first end of the eighth resistor R8 are connected to the first end of the sixth resistor R6, and form a voltage input node, and the voltage input node is the voltage input of the constant current unit 30. The second end of the sixth resistor R6 and the first end of the seventh resistor R7 are connected to the enable end EN of the first chip U1, the second end of the seventh resistor R7 is grounded, and the first end of the fourth capacitor C4 is connected. The first end of the second diode D1 is connected to the voltage input terminal V_IN of the first chip U1, the second end of the fourth capacitor C4 is grounded, and the second end of the eighth resistor R8 is connected to the first end of the second capacitor C2. Connected, the second end of the second capacitor C2 and the second end of the second diode D2 are connected to the sensing end LX of the first chip U1, the voltage input terminal V_IN of the first chip U1 and the negative current detection of the first chip U1. The ninth resistor R9, the tenth resistor R10 and the eleventh resistor Rl l are connected in parallel between the terminals SEN, and the first end of the third capacitor C3 and the first end of the twelfth resistor _R12 are connected to the signal of the first chip _m . _(TM) input terminal, a second terminal of the third capacitor C3, the second end of the twelfth resistor R12 to the signal input terminal of the constant current unit 30, a first electrical The first end of the L1 is connected to the sensing end LX of the first chip U1, and the second end of the first inductor L1, the first end of the fifth capacitor C5, and the first end of the sixth capacitor C6 are connected to the second inductor L1. At one end, the negative current detecting end SEN of the first chip U1, the second end of the fifth capacitor C5, and the second end of the sixth capacitor C6 are connected to the second end of the second inductor L 2 , and the first end of the seventh capacitor C7 The second end of the seventh capacitor C7 is connected to the fourth end of the second inductor L2, and the first end of the seventh capacitor C7 is the first signal output end of the constant current unit 30. a second signal output end of the second terminal constant current unit 30 of the seventh capacitor C7.

[0042] It should be noted that the dimming unit 10 outputs the second direct current to the constant current unit 30 according to the first direct current, and is input to the signal input terminal TM of the first chip U1 through the second end of the twelfth resistor R12.

[0043] Since the ninth resistor R9, the tenth resistor R10, and the eleventh resistor Rl l are sequentially connected in parallel with the voltage input terminal V_IN of the first chip U1 and the negative current detecting terminal SEN of the first chip U1, the first chip is made. A voltage difference is formed between the voltage input terminal V_IN of U1 and the negative current detecting terminal SEN of the first chip U1.

[0044] It can be understood that, in the process that the first chip U1 in the constant current unit 30 operates according to the second direct current driving LED load 120, the second inductor L2 is used to filter the signal in the constant current unit 30, The first end and the second end of the seventh capacitor C7 are further output to the LED load 120.

[0045] As an embodiment of the invention, the first bypass transistor is an IGBT transistor, a triode or a MOS transistor.

[0046] Further, as a preferred embodiment of the present invention, the first bypass transistor Q1 may be an NPN transistor Q1, the base of the NPN transistor Q1 is a controlled end of the first bypass transistor Q1, and the NPN transistor Q1 is used. Collecting electricity It is extremely high that the high-potential terminal of Q1 is closed, and the emission of NPN-type transistor Q1 is extremely low at the low-potential end of the first bypass transistor Q1.

[0047] Further, as another preferred embodiment of the present invention, the first bypass transistor Q1 may be an N-type MOS transistor Q1, and the gate of the N-type MOS transistor Q1 is a controlled end of the first bypass transistor Q1, N The drain of the type MOS transistor Q1 is the high potential end of the first bypass transistor Q1, and the source of the N-type MOS transistor Q1 is the low potential terminal of the first bypass transistor Q1.

Another object of the present embodiment is to provide an LED lamp 200. As shown in FIG. 3, the LED lamp 200 includes an LED load 120, and further includes an adjustment circuit 100 of the LED lamp as described above.

[0049] Since the specific embodiment and working principle of an LED lamp provided in this embodiment related to the present invention are described in the above embodiments and in detail, therefore, no further details are provided herein.

[0050] The invention provides an adjustment circuit of an LED lamp connected between a constant voltage power source and an LED load, the adjustment circuit comprising: a dimming unit, a voltage switching unit and a constant current unit; the dimming unit is according to a constant voltage power supply The first direct current is supplied to the constant current unit to output the second direct current to enable the constant current unit to drive the LED load in a constant current; after dimming the LED load, the voltage switching unit adjusts the voltage of the second direct current; The light unit adjusts the voltage of the second direct current according to the received dimming signal; or after the voltage switching unit adjusts the voltage of the second direct current, the dimming unit applies the second direct current according to the received dimming signal. The voltage is adjusted to enrich the way the LED load is adjusted.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] An LED brightness adjustment circuit is connected between a constant voltage power supply and an LED load, wherein the LED brightness adjustment circuit comprises: a dimming unit, a voltage switching unit, and a constant current unit;

The dimming unit outputs a second direct current to the constant current unit according to the first direct current provided by the constant voltage power source, so that the constant current unit performs constant current driving on the LED load; Performing dimming, the voltage switching unit adjusting the voltage of the second direct current; or

The dimming unit adjusts a voltage of the second direct current according to the received dimming signal; or

After the voltage switching unit adjusts the voltage of the second direct current, the dimming unit adjusts the voltage of the second direct current according to the received dimming signal.

The LED brightness adjustment circuit according to claim 1 , wherein the adjustment signal input end of the dimming unit is configured to access the dimming signal, and the voltage input end of the dimming unit Connected to the first output end of the constant voltage power supply, the voltage input end of the constant current unit is connected to the second output end of the constant voltage power supply, the signal output end of the dimming unit and the voltage switching unit The output end is connected to the signal input end of the constant current unit, and the first signal output end of the constant current unit is connected to the input end of the LED load, and the second signal output end of the constant current unit and the LED The outputs of the load are connected.

The LED brightness adjustment circuit according to claim 2, wherein the dimming unit comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first a bypass tube, a first diode, and a first capacitor;

The first end of the first resistor is a voltage input end of the dimming unit, and the second end of the first resistor and the first end of the second resistor are connected to a height of the first bypass tube a first end of the second resistor and a first end of the first diode are connected to the controlled end of the first bypass tube, and the controlled end of the first bypass tube is An adjustment signal input end of the dimming unit, a second end of the first diode is connected to a first end of the fourth resistor, and a second end of the fourth resistor is grounded, the first a low potential end of the switch and the third resistor The first end of the third resistor is connected to the first end of the first capacitor to the first end of the fifth resistor, and the first end of the fifth resistor is the The signal output end of the light unit, the second end of the first capacitor and the second end of the fifth resistor are commonly grounded.

[Claim 4] The LED brightness adjustment circuit according to claim 2, wherein the voltage switching unit comprises: a plurality of switching resistors and a load selection switch;

The load selection includes at least one empty load end and a plurality of load connection ends, wherein the load selection switch empty end is the voltage switching unit output end, and the first end of the plurality of switching resistors A plurality of load connection ends of the load selection switch are respectively connected, and the second ends of the plurality of switch resistors are commonly grounded.

The LED brightness adjustment circuit according to claim 2, wherein the constant current unit comprises: a first chip, a first inductor, a second inductor, a second diode, and a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

The first end of the second diode and the first end of the eighth resistor are connected to the first end of the sixth resistor, and form a voltage input node, where the voltage input node is the constant current unit a voltage input end, the second end of the sixth resistor and the first end of the seventh resistor are connected to the enable end of the first chip, and the second end of the seventh resistor is grounded, the a first end of the fourth capacitor and a voltage input end of the first chip are connected to the first end of the second diode

The second end of the fourth capacitor is grounded, the second end of the eighth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is opposite to the second diode The second end of the first chip is connected to the sensing end of the first chip, and the ninth resistor and the tenth are sequentially connected in parallel between the voltage input end of the first chip and the negative current detecting end of the first chip. a first end of the third capacitor and a first end of the twelfth resistor are connected to a signal input end of the first chip, and a second end of the third capacitor Grounding, the second end of the twelfth resistor is a signal input end of the constant current unit, the first end of the first inductor is connected to the sensing end of the first chip, and the first inductor is The second end, the first end of the fifth capacitor, and the first end of the sixth capacitor are connected to the second inductor The first end, the negative current detecting end of the first chip, the second end of the fifth capacitor, and the second end of the sixth capacitor are connected to the second end of the second inductor, the seventh a first end of the capacitor is connected to a third end of the second inductor, a second end of the seventh capacitor is connected to a fourth end of the second inductor, and a first end of the seventh capacitor is a first signal output end of the constant current unit, a second signal of the constant current unit of the second end of the seventh capacitor, the LED brightness adjusting circuit according to claim 3, wherein the first The switch is an IGBT tube, a triode or a MOS tube.

The LED brightness adjustment circuit according to claim 6, wherein the first switch tube is an NPN type transistor, and the base of the NPN type transistor is a controlled end of the first switch tube, The collector of the NPN type transistor is a high potential end of the first bypass tube, and the emission of the NPN type transistor is extremely low end of the first bypass tube.

The adjustment circuit of the LED lamp of claim 6, wherein the first bypass transistor is an N-type MOS transistor, and the gate of the N-type MOS transistor is a controlled end of the first bypass transistor The drain of the N-type MOS transistor is a high potential end of the first bypass transistor, and the source of the N-type MOS transistor is a low potential end of the first bypass transistor.

An LED lamp comprising a constant voltage power source and an LED load, characterized in that the LED lamp further comprises the LED brightness adjusting circuit according to any one of claims 1 to 8.