CN201928486U - Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit - Google Patents
Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit Download PDFInfo
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- CN201928486U CN201928486U CN2010206561651U CN201020656165U CN201928486U CN 201928486 U CN201928486 U CN 201928486U CN 2010206561651 U CN2010206561651 U CN 2010206561651U CN 201020656165 U CN201020656165 U CN 201020656165U CN 201928486 U CN201928486 U CN 201928486U
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Abstract
The utility model discloses a pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit which is characterized in that the driving circuit comprises a voltage stabilizing circuit, a constant current and PWM dimming control circuit, an output filter circuit and an auxiliary power supply circuit, wherein the voltage stabilizing circuit comprises an operational amplifier IC2, a diode D4, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a precision voltage benchmark IC3, a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor C7, the constant current and PWM dimming control circuit comprises the operational amplifier IC2, a diode D3, a capacitor C2, a capacitor C3, a capacitor C8, a resistor R2, a resistor R5, a resistor R6, the resistor R10, a resistor R11, a resistor R12, a resistor R13, the precision voltage benchmark IC3, the capacitor C2, the capacitor C3, a capacitor C7, the capacitor C8 and a transistor Q1, the output filter circuit comprises an electrolytic capacitor EC1, an electrolytic capacitor EC2, an electrolytic capacitor EC3, an inductor L1 and an inductor L2, and the auxiliary power supply circuit comprises a winding T1B of a transformer T1, a diode D2, a resistor R3 and an electrolytic capacitor EC4. The PWM dimming LED driving circuit has the advantages of simplifying the circuits, reducing the cost, and being excellent in dynamic performance and simple in structure.
Description
Technical field
The utility model relates to a kind of PWM dimming LED drive circuit, be specifically a kind ofly simplify circuit, reduce cost, have good dynamic property, PWM dimming LED drive circuit simple in structure.
Background technology
At present, adopt the civil power input can realize that the LED driving power of PWM (pulsewidth adjustment) light modulation generally adopts the Two Stages structure, prime adopts the AC/DC converter, the back level adopts band PWM dimming function DC/DC constant current chip, because the general input voltage of DC/DC constant current chip is all below 75VDC, necessary dual-purpose Two Stages when adopting the civil power input, front stage converter converts civil power to low-voltage DC, the back level is again by constant current chip drives LED load, pwm signal is input to the ON time of the light modulation pin control switch pipe of chip and adjusts its output current, reaches the purpose of light modulation.
Usually, the PWM light adjusting circuit shown in figure one, the access DC/DC constant-current circuit of the output voltage of prime AC/DC converter, the core of constant-current circuit is IC1, pwm signal is input to the brightness adjustment control pin (DIM) of IC1, when input signal is Low, the DIM pin of IC1 can be received the GND pin, this moment, IC1 stopped action, do not have electric current to flow through LED, dimming function is by IC1, when input signal is High, IC1 can move once more, and electric current flows through LED once more.
Adopt the weak point of foregoing circuit to be: owing to increased one-level DC/DC constant-current circuit, the circuit structure complexity has not only improved production cost, and has reduced the conversion efficiency of complete machine, limited by the power output of chip, is not easy to realize big electric current output.
As mentioned above, need a kind of reliable and practical PWM light adjusting circuit to solve above problem.
Summary of the invention
The purpose of this utility model provide a kind ofly simplify circuit, reduce cost, have good dynamic property, PWM dimming LED drive circuit simple in structure.
The purpose of this utility model is achieved through the following technical solutions.
A kind of PWM dimming LED drive circuit is characterized in that: described drive circuit comprises voltage stabilizing circuit, constant current and PWM adjusting control circuit, output filter circuit and auxiliary power supply circuit; Voltage stabilizing circuit comprises operational amplifier IC2, diode D4, resistance R 7, resistance R 8, resistance R 9, resistance R 10, standard of precision voltage IC3, capacitor C 4, capacitor C 5, capacitor C 6 and capacitor C 7; Constant current and PWM adjusting control circuit comprise operational amplifier IC2, diode D3, capacitor C 2, capacitor C 3, capacitor C 8, resistance R 2, resistance R 5, resistance R 6, resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, standard of precision voltage IC3, capacitor C 2, capacitor C 3, capacitor C 7, capacitor C 8 and transistor Q1; Output filter circuit comprises electrochemical capacitor EC1, electrochemical capacitor EC2, electrochemical capacitor EC3, inductance L 1 and inductance L 2; The auxiliary power supply circuit comprises winding T1B, diode D2, the resistance R 3 and electrochemical capacitor EC4 of transformer T1.
In the described voltage stabilizing circuit, resistance R 10 is connected on the positive pole of auxiliary power supply output electrochemical capacitor EC4 and in-phase input end the 3rd pin of operational amplifier IC2,1 pin of standard of precision voltage operational amplifier IC3 and the 3rd pin of receiving operational amplifier IC2 after 3 pin link to each other, resistance R 8 is connected between 2 pin of the negative pole of output diode D1 and operational amplifier IC2, and resistance R 9 is connected between 2 pin and ground of operational amplifier IC2.
In described constant current and the PWM adjusting control circuit, resistance R 11 is connected between the 3rd pin and the 5th pin of operational amplifier IC2, resistance R 12, capacitor C 3, be connected after capacitor C 8 parallel connections between 5 pin and ground of operational amplifier IC2, resistance R 13 1 ends link to each other with 5 pin of operational amplifier IC2, the collector electrode of another termination triode Q1, the grounded emitter of Q1, resistance R 14 is connected between the base stage and ground of triode Q1, external PWM signal is received the base stage of triode Q1, resistance R 6 one ends link to each other with the 6th pin of operational amplifier IC2, and the other end links to each other with the node of inductance L 2 with sample resistance R2.
The utility model compared with prior art has the following advantages:
The utility model compared with prior art owing to reduced one-level DC/DC constant current conversion, directly adds the PWM light adjusting circuit at AC/DC output feedback end, simplifies circuit, reduces cost.Have good dynamic property, simple in structure, have certain actual application value.
Description of drawings
Fig. 1 is the prior PWM dimming LED drive circuit;
Fig. 2 is the PWM dimming LED drive circuit of transistor Q1 for the utility model switching tube;
Fig. 3 the utility model switching tube is the PWM dimming LED drive circuit of field effect transistor Q1.
Embodiment
Below in conjunction with accompanying drawing the utility model PWM dimming LED drive circuit is described in further detail.
As shown in Figure 2, PWM light adjusting circuit described in the utility model, operational amplifier IC2 and D4, R7-R10, standard of precision voltage IC3, capacitor C 4-C7 constitute voltage stabilizing circuit, winding T1B and the D2 of transformer T1, R3, EC4 constitutes the auxiliary power supply circuit.Resistance R 10 is connected on the positive pole of auxiliary power supply output EC4 and in-phase input end the 3rd pin of IC2, R8 is connected between 2 pin of the negative pole of output diode D1 and IC2, R9 is connected between 2 pin and ground of IC2,1 pin of standard of precision voltage IC3 and the 3rd pin of receiving IC2 after 3 pin link to each other, then the voltage of 3 pin be by clamper in 2.5V as reference voltage, maximum output voltage Vo=(1+R8/R9) the * 2.5V of power supply then.The process of voltage stabilizing is: when output voltage V o raises, the 2 pin voltages of IC3 rise, 1 pin is output as low level, the diode section input current of photoelectrical coupler IC1 increases, the built-in triode of IC1 is delivered to induced signal the feedback control circuit of elementary control chip, adjust the width of output signal, reduce output voltage, reach the voltage stabilizing purpose.The main effect of accessory power supply is when the power supply output short-circuit, still has voltage can keep the operate as normal of IC2, has strengthened the reliability of short-circuit protection.The operation principle of constant current and PWM adjusting control circuit is: R11 is connected between the 3rd pin and the 5th pin of IC2, R12, C3 is connected after the C8 parallel connection between 5 pin and ground of IC2, and R13 one end links to each other with 5 pin of IC2, the collector electrode of another termination triode Q1, the grounded emitter of Q1, R14 is connected between the base stage and ground of Q1, and external PWM signal is received the base stage of Q1, R6 one end links to each other with the 6th pin of IC2, and the other end links to each other with the node of inductance L 2 with sample resistance R2.When not having the input of PWM dim signal, the 5 pin voltages of IC2 are V1=2.5*[R12/ (R11+R12)], then electric power outputting current Io ≈ V1/R2. is when the LED load open circuit, constant current and PWM light adjusting circuit are inoperative, output voltage is controlled in the maximum output voltage scope of setting by voltage stabilizing circuit, when inserting the LED load in the circuit, its voltage stabilizing circuit is with effect out of hand, output voltage is by the pressure drop decision of the LED lamp pearl of series connection, output current determined by constant current and PWM adjusting control circuit, when pwm signal is imported, and the mean value Rave ≈ D*R13 of resistance R 13 then, D is the positive duty ratio of input pwm signal, this moment, R13 was equivalent to an end ground connection adjustable resistance, therefore, can change the 5 pin voltages of IC2 by pwm signal, and then the size of control output current, reach the effect of light modulation.
As shown in Figure 3, the difference of present embodiment and the described embodiment of Fig. 2 is that diode D3 and D4 both positive and negative polarity are reverse, and the in-phase input end and the inverting input of operational amplifier are exchanged, and Q1 changes to field effect transistor by original transistor.Its operation principle and process and example 1 are identical.
Claims (3)
1. PWM dimming LED drive circuit, it is characterized in that: described drive circuit comprises voltage stabilizing circuit, constant current and PWM adjusting control circuit, output filter circuit and auxiliary power supply circuit; Voltage stabilizing circuit comprises operational amplifier IC2, diode D4, resistance R 7, resistance R 8, resistance R 9, resistance R 10, standard of precision voltage IC3, capacitor C 4, capacitor C 5, capacitor C 6 and capacitor C 7; Constant current and PWM adjusting control circuit comprise operational amplifier IC2, diode D3, capacitor C 2, capacitor C 3, capacitor C 8, resistance R 2, resistance R 5, resistance R 6, resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, standard of precision voltage IC3, capacitor C 2, capacitor C 3, capacitor C 7, capacitor C 8 and transistor Q1; Output filter circuit comprises electrochemical capacitor EC1, electrochemical capacitor EC2, electrochemical capacitor EC3, inductance L 1 and inductance L 2; The auxiliary power supply circuit comprises winding T1B, diode D2, the resistance R 3 and electrochemical capacitor EC4 of transformer T1.
2. PWM dimming LED drive circuit according to claim 1, it is characterized in that: in the described voltage stabilizing circuit, resistance R 10 is connected on the positive pole of auxiliary power supply output electrochemical capacitor EC4 and in-phase input end the 3rd pin of operational amplifier IC2,1 pin of standard of precision voltage operational amplifier IC3 and the 3rd pin of receiving operational amplifier IC2 after 3 pin link to each other, resistance R 8 is connected between 2 pin of the negative pole of output diode D1 and operational amplifier IC2, and resistance R 9 is connected between 2 pin and ground of operational amplifier IC2.
3. PWM dimming LED drive circuit according to claim 1, it is characterized in that: in described constant current and the PWM adjusting control circuit, resistance R 11 is connected between the 3rd pin and the 5th pin of operational amplifier IC2, resistance R 12, capacitor C 3, be connected after capacitor C 8 parallel connections between 5 pin and ground of operational amplifier IC2, resistance R 13 1 ends link to each other with 5 pin of operational amplifier IC2, the collector electrode of another termination triode Q1, the grounded emitter of Q1, resistance R 14 is connected between the base stage and ground of triode Q1, external PWM signal is received the base stage of triode Q1, resistance R 6 one ends link to each other with the 6th pin of operational amplifier IC2, and the other end links to each other with the node of inductance L 2 with sample resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206561651U CN201928486U (en) | 2010-12-10 | 2010-12-10 | Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206561651U CN201928486U (en) | 2010-12-10 | 2010-12-10 | Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit |
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| CN201928486U true CN201928486U (en) | 2011-08-10 |
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| CN2010206561651U Expired - Fee Related CN201928486U (en) | 2010-12-10 | 2010-12-10 | Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378452A (en) * | 2011-11-08 | 2012-03-14 | 山东浪潮华光照明有限公司 | Electronic control type 1-10 V generator of LED (Light-Emitting Diode) light-dimming power supply |
| CN103152939A (en) * | 2013-02-26 | 2013-06-12 | 茂硕电源科技股份有限公司 | Four-in-one light-dimming circuit of light-emitting diode (LED) power source |
| CN106851909A (en) * | 2017-02-09 | 2017-06-13 | 中山自信照明科技有限公司 | LED illumination lamp constant-current circuit |
| CN108508801A (en) * | 2018-03-30 | 2018-09-07 | 山东泰开电力电子有限公司 | A kind of the intake Acquisition Circuit and method of adaptive remote signalling power supply |
-
2010
- 2010-12-10 CN CN2010206561651U patent/CN201928486U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378452A (en) * | 2011-11-08 | 2012-03-14 | 山东浪潮华光照明有限公司 | Electronic control type 1-10 V generator of LED (Light-Emitting Diode) light-dimming power supply |
| CN103152939A (en) * | 2013-02-26 | 2013-06-12 | 茂硕电源科技股份有限公司 | Four-in-one light-dimming circuit of light-emitting diode (LED) power source |
| CN106851909A (en) * | 2017-02-09 | 2017-06-13 | 中山自信照明科技有限公司 | LED illumination lamp constant-current circuit |
| CN108508801A (en) * | 2018-03-30 | 2018-09-07 | 山东泰开电力电子有限公司 | A kind of the intake Acquisition Circuit and method of adaptive remote signalling power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 528200, No. 1, Rui Xiang Road, Daliang Industrial Park, Shunde District, Guangdong, Foshan, Fengxiang Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., LTD. Address before: 528200 Guangdong province Foshan city Shunde District Daliang Industrial Park Fengxiang Huaye Road No. 1 Patentee before: Foshan Shunde Realdesign Electronics Industry Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20151210 |
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| EXPY | Termination of patent right or utility model |