CN104168685A - Loop compensation control-based dimmable LED driver - Google Patents
Loop compensation control-based dimmable LED driver Download PDFInfo
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- CN104168685A CN104168685A CN201310182113.3A CN201310182113A CN104168685A CN 104168685 A CN104168685 A CN 104168685A CN 201310182113 A CN201310182113 A CN 201310182113A CN 104168685 A CN104168685 A CN 104168685A
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Abstract
The invention relates to a loop compensation control-based dimmable LED driver. With resistors with adjustable voltages, the loop compensation voltage can be changed with the input voltage and thus the duty ratio of a switching power supply can be adjusted to change a loop current, so that the loop current is maintained to be higher than a holding current of a TRIAC light modulator and thus flickering of an LED load during the light modulation process can be eliminated. The LED driver comprises an equivalent potentiometer R and a typical primary side feedback-based power supply switch controller U1; the power supply switch controller U1 includes sampling circuits S/H1 and S/H2, an amplifier circuit A1, a control circuit CTRL, comparison circuits A2 and A3, a PWM logic circuit, a reference voltage circuit Vref, an oscillator circuit OSC, and a drive circuit DRIVER; the equivalent potentiometer R is connected between a COMP pin of the power supply switch controller U1and a ground unit and the voltage adjusting terminal is connected to an input voltage Vin.
Description
Technical field
The present invention relates to a kind of Dimmable LED driver based on loop compensation control.
Background technology
LED illumination is a kind of desirable lighting source, has the advantages such as low in energy consumption, life-span length.And traditional lighting source, as incandescent lamp, consumed power is large and the life-span is short, so just LED bulb becomes its desirable substitute.Most widely used bulb brightness regulate and control method is to adopt traditional bidirectional triode thyristor (TRIAC) phase-controlled dimmer in the market.The original design of traditional TRIAC dimmer is the incandescent lamp for regulating and controlling hectowatt grade, is made up of high-power switch device.LED bulb and TRIAC dimmer that consumed power is little can produce and influence each other in actual applications, make LED bulb occur visible flicker.So for TRIAC dimming LED (Light Emitting Diode) bulb, its maximum problem is the compatibility of dimmer.As shown in Figure 1, by Rv, the RC delay circuit of Rt and Ct composition can make TRIAC dimmer delay start to the circuit theory of tradition TRIAC dimmer.In the time that the voltage of Ct rises to the trigger voltage that triggers interchange diode (DIAC), TRIAC dimmer starts.The resistance of potentiometer Rv is larger, and start-up time is longer, and shortens the ON time of TRIAC dimmer, reduces its angle of flow, and the average power supply of input load simultaneously will reduce, and the brightness of bulb weakens thereupon.In the time of TRIAC dimmer conduction, its loop current need be greater than the electric current that maintains of dimmer, otherwise dimmer can cut out and cause lamp to go out.Because LED bulb is non-resistive load, conventionally can in drive circuit, add RC loop to provide where necessary and maintain electric current, see RwCw in Fig. 2.But, in light modulation process RC loop voltage drop along time reverse current is provided, make TRIAC dimmer cannot keep maintaining electric current, and then cause LED bulb flicker.When this situation also often occurs in less light modulation angle.
Summary of the invention
In order to overcome existing LED drive circuit in the flicker problem using in TRIAC dimmer for light control process, the invention provides a kind of light adjusting circuit and method based on loop compensation control, eliminate the flicker of LED bulb in TRIAC light modulation process.Change loop compensation voltage by voltage adjustable resistor, and then the duty ratio of by-pass cock, make loop current remain on maintaining on electric current of TRIAC dimmer.
The technical solution adopted for the present invention to solve the technical problems is: a kind of light adjusting circuit driving for LED based on loop compensation control, comprises equivalent potential meter R, power supply switch controller U1; Described power supply switch controller U1 comprises sample circuit S/H1 and S/H2, amplifier circuit A1, control circuit CTRL, error amplifier comparison circuit A2, comparison circuit A3, PWM logical circuit, reference voltage circuit Vref, pierce circuit OSC, drive circuit DRIVER etc.
Described equivalent potential meter R is connected between the COMP pin and ground connection of described power supply switch controller U1, and its voltage-regulation is connected to input voltage vin.
The input of described sample circuit S/H1 is connected to respectively CS and the GND pin of described power supply switch controller U1, and the output of described sample circuit S/H1 is connected with the input of described amplifier circuit A1.The input of described sample circuit S/H2 is connected to the FB pin of described power supply switch controller U1, and the output of described sample circuit S/H2 is connected with described control circuit CTRL.Described amplifier circuit A1 output is connected to described control circuit CTRL.The input of described error amplifier comparison circuit A2 is accessed by output and the described reference voltage circuit Vref of described control circuit CTRL respectively.The input of described comparison circuit A3 respectively with the output of described error amplifier comparison circuit A2, the COMP pin of described power supply switch controller U1, and described pierce circuit OSC is connected.The output of described comparison circuit A3 accesses described PWM logical circuit.The output of described PWM logical circuit accesses described drive circuit DRIVER, and the GATE pin of the output of described drive circuit DRIVER and described power supply switch controller U1 is connected.
The invention has the beneficial effects as follows and utilize simply that low cost circuit is eliminated the flicker of LED bulb in TRIAC light modulation process.During particularly to low-angle TRIAC light modulation, still effective.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention will be further described with concrete case study on implementation.
Fig. 1 is the circuit theory schematic diagram of traditional TRIAC dimmer
Fig. 2 is that TRIAC dimmer connects and oscillogram
Fig. 3 is circuit theory diagrams of the present invention
Fig. 4 is circuit theory oscillogram of the present invention
Fig. 5 is the circuit diagram of realizing of the present invention
Embodiment
With reference to the accompanying drawings, the embodiment of driver of the present invention is described in detail.
As shown in Figure 3, the present invention by detecting input line voltage signal, regulates equivalent potential meter resistance in TRIAC light modulation process, changes loop compensation voltage, and then the duty ratio of by-pass cock power supply, make loop current remain on maintaining on electric current of TRIAC dimmer.
Fig. 4 is specific implementation of the present invention, and a kind of light adjusting circuit driving for LED based on loop compensation control, comprises resistance R 1, R2, and R3, rectifier diode D1, MOSFET manages Q1, power supply switch controller U1; Described power supply switch controller U1 comprises sample circuit S/H1 and S/H2, amplifier circuit A1, control circuit CTRL, error amplifier comparison circuit A2, comparison circuit A3, PWM logical circuit, reference voltage circuit Vref, pierce circuit OSC, drive circuit DRIVER etc.
Described resistance R 1 and R2 are connected in series between the input voltage vin and ground connection after bridge rectifier.The positive pole of described rectifier diode D1 is connected between resistance R 1 and R2, and the negative pole of described rectifier diode D1 is connected to the grid of described MOSFET pipe Q1.The source electrode of described MOSFET pipe Q1 is connected to the COMP pin of described power supply switch controller U1 through resistance R 3.The direct ground connection of drain electrode of described MOSFET pipe Q1.
The input of described sample circuit S/H1 is connected to respectively CS and the GND pin of described power supply switch controller U1, and the output of described sample circuit S/H1 is connected with the input of described amplifier circuit A1.The input of described sample circuit S/H2 is connected to the FB pin of described power supply switch controller U1, and the output of described sample circuit S/H2 is connected with described control circuit CTRL.Described amplifier circuit A1 output is connected to described control circuit CTRL.The input of described error amplifier comparison circuit A2 is accessed by output and the described reference voltage circuit Vref of described control circuit CTRL respectively.The input of described comparison circuit A3 respectively with the output of described error amplifier comparison circuit A2, the COMP pin of described power supply switch controller U1, and described pierce circuit OSC is connected.The output of described comparison circuit A3 accesses described PWM logical circuit.The output of described PWM logical circuit accesses described drive circuit DRIVER, and the GATE pin of the output of described drive circuit DRIVER and described power supply switch controller U1 is connected.
The basic functional principle of foregoing circuit is by input line voltage dividing potential drop by resistance R 1 and R2, through rectifier diode D1 rectification, put on the grid of MOSFET pipe Q1, and the voltage of the loop compensation pin COMP of power supply switch controller U1 puts on the source electrode of MOSFET pipe Q1, make MOSFET pipe Q1 be operated in the range of linearity, as shown in Fig. 4 ellipse, form voltage adjustable resistor circuit.The load of voltage adjustable resistor changes with the variation of input voltage, makes the voltage of loop compensation pin COMP also change simultaneously thereupon.In the time of the change at the light modulation angle of TRIAC dimmer, for example, in the time of low-angle light modulation angle (shown in Fig. 2), the resistance of voltage adjustable resistor reduces, and the voltage of loop compensation pin COMP decreases.The voltage of loop compensation pin COMP obtains the duty ratio of switch periods by comparison circuit A3, drive drive circuit DRIVER to remove driven MOS pipe and change loop current by PWM logical circuit.Flow through the electric current of power MOS pipe M1 and the currents combination of RC loop (as Rw in Fig. 2 and Cw) and keep loop current to be greater than the electric current that maintains of TRIAC dimmer, make LED flicker free.
Above, describe the specific embodiment of the present invention and embodiment with reference to the accompanying drawings.But those skilled in the art can understand, without departing from the spirit and scope of the present invention in the situation that, can also do various changes and replacement to embodiment.These changes and replacement all drop in the claims in the present invention book limited range.
Claims (3)
1. the Dimmable LED driver based on loop compensation control, comprises equivalent potential meter R, power supply switch controller U1; Described power supply switch controller U1 comprises sample circuit S/H1 and S/H2, amplifier circuit A1, control circuit CTRL, error amplifier comparison circuit A2, comparison circuit A3, PWM logical circuit, reference voltage circuit Vref, pierce circuit OSC, drive circuit DRIVER;
Described equivalent potential meter R is connected between the COMP pin and ground connection of described power supply switch controller U1, and its voltage-regulation is connected to input voltage vin;
The input of described sample circuit S/H1 is connected to respectively CS and the GND pin of described power supply switch controller U1, the output of described sample circuit S/H1 is connected with the input of described amplifier circuit A1, the input of described sample circuit S/H2 is connected to the FB pin of described power supply switch controller U1, the output of described sample circuit S/H2 is connected with described control circuit CTRL, described amplifier circuit A1 output is connected to described control circuit CTRL, the input of described error amplifier comparison circuit A2 is accessed by output and the described reference voltage circuit Vref of described control circuit CTRL respectively, the input of described comparison circuit A3 respectively with the output of described error amplifier comparison circuit A2, the COMP pin of described power supply switch controller U1, and described pierce circuit OSC is connected, the output of described comparison circuit A3 accesses described PWM logical circuit, the output of described PWM logical circuit accesses described drive circuit DRIVER, the GATE pin of the output of described drive circuit DRIVER and described power supply switch controller U1 is connected.
2. the Dimmable LED driver based on loop compensation control according to claim 1, is characterized in that by changing loop compensation voltage, and then the duty ratio of by-pass cock, makes loop current remain on maintaining on electric current of TRIAC dimmer.
3. the Dimmable LED driver based on loop compensation control according to claim 1, it is characterized in that utilizing voltage adjustable resistor that loop compensation voltage is changed with input voltage, regulating loop electric current, reaches elimination LED and loads on the flicker occurring in light modulation process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182113.3A CN104168685A (en) | 2013-05-16 | 2013-05-16 | Loop compensation control-based dimmable LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182113.3A CN104168685A (en) | 2013-05-16 | 2013-05-16 | Loop compensation control-based dimmable LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104168685A true CN104168685A (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310182113.3A Pending CN104168685A (en) | 2013-05-16 | 2013-05-16 | Loop compensation control-based dimmable LED driver |
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| Country | Link |
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| CN (1) | CN104168685A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020073622A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市崧盛电子股份有限公司 | Feedback loop compensation switching circuit and driving power supply |
| CN112867207A (en) * | 2021-02-19 | 2021-05-28 | 南京工业职业技术大学 | High-linearity TRIAC dimming compatible LED driving circuit |
-
2013
- 2013-05-16 CN CN201310182113.3A patent/CN104168685A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020073622A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市崧盛电子股份有限公司 | Feedback loop compensation switching circuit and driving power supply |
| CN112867207A (en) * | 2021-02-19 | 2021-05-28 | 南京工业职业技术大学 | High-linearity TRIAC dimming compatible LED driving circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI ENPOW MICROELECTRONICS CO., LTD. Document name: Notification of Publication of the Application for Invention |
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| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI ENPOW MICROELECTRONICS CO., LTD. Document name: Notification of before Expiration of Request of Examination as to Substance |
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| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI ENPOW MICROELECTRONICS CO., LTD. Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141126 |