CN204291476U - LED dimming power source circuit and LED lamp - Google Patents
LED dimming power source circuit and LED lamp Download PDFInfo
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- CN204291476U CN204291476U CN201420736114.8U CN201420736114U CN204291476U CN 204291476 U CN204291476 U CN 204291476U CN 201420736114 U CN201420736114 U CN 201420736114U CN 204291476 U CN204291476 U CN 204291476U
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Abstract
A kind of LED dimming power source circuit and LED lamp, this circuit connects with high-voltage DC power supply, and comprise an adjustable electric pressure side, control module, division module, regulating filtering module, N-type metal-oxide-semiconductor and inductor, division module exports adjustable linear voltage; The drain electrode of metal-oxide-semiconductor connects the anode of a diode, and the negative electrode of this diode connects the anode of high-voltage DC power supply, and the drain electrode of metal-oxide-semiconductor connects the first end of inductor; Second end of the input inductor of regulating filtering module, exports termination LED; The source current of control module sampling metal-oxide-semiconductor, and output to the duty ratio of the pwm signal of metal-oxide-semiconductor grid according to source current and/or adjustable linear voltage-regulation, with the electric current and voltage size of the anode and negative terminal access that regulate LED.Load adjustable signal on LED dimming power source circuit by adjustable electric pressure side, thus external signal can be utilized quickly to carry out light modulation to LED; The brightness that negative-feedback signal regulates LED automatically can also be realized by the source current of metal-oxide-semiconductor of sampling.
Description
Technical field
The utility model relates to LED light regulating technology, particularly relates to a kind of LED dimming power source circuit and LED lamp.
Background technology
Current light regulating technology mainly contains three kinds: PWM (Pulse Width Modulation, pulse width modulating technology) light modulation, simulation light modulation and digital dimming.On market, a lot of LED (Light Emitting Diode, light-emitting diode) driver can both support one or more light regulating technologies wherein.PWM dimming mode is a kind of light regulating technology utilizing simple digit pulse switch White LED Driver repeatedly.The system of application person only needs to provide wide, narrow different digital type pulse, can realize simply changing output current, thus regulates the brightness of white light LEDs.
PWM light modulation in existing LED drive circuit or simulate light modulation normally used be balance chip (Balance IC), by the duty ratio (Duty) of the internal module regulation output electric current of this chip, reach the object of the brightness regulating LED.The circuit of usual balance chip is very complicated, and need to arrange corresponding light modulation (Dimming) module in the inside of this chip, major function is exactly that the pwm signal of input and the drive singal of the field effect transistor (MOSFET) realizing current balance type are done a product, field effect transistor is made to do switch motion according to pwm signal, thus the duty ratio of control LED is consistent with the duty ratio of the pwm signal of input, realize PWM light modulation or simulation light modulation, circuit design difficulty so can be caused to increase, and add production cost.
Utility model content
Based on this, be necessary to provide a kind of LED dimming power source circuit that fast can carry out light modulation to LED.
A kind of LED dimming power source circuit, connects with high-voltage DC power supply, comprises an adjustable electric pressure side, control module, division module, regulating filtering module, N-type metal-oxide-semiconductor and inductor, wherein:
Described division module connect described adjustable electric pressure side and described high-voltage DC power supply, export adjustable linear voltage; The drain electrode of described metal-oxide-semiconductor connects the anode of a diode, and the negative electrode of this diode connects the anode of described high-voltage DC power supply, and the drain electrode of described metal-oxide-semiconductor connects the first end of described inductor;
The first input end of described regulating filtering module connects the anode of high-voltage DC power supply, the second end of inductor described in the second input termination, and the first output and the second output connect anode and the negative terminal of LED respectively;
Described control module is sampled the source current of described metal-oxide-semiconductor, and output to the duty ratio of the pwm signal of described metal-oxide-semiconductor grid according to described source current and described adjustable linear voltage-regulation, with the electric current and voltage size of the anode and negative terminal access that regulate described LED.
Further, described control module has:
Start end, connects the anode of described high-voltage DC power supply;
Adjustable signal input, connects the described adjustable linear voltage of the output of described division module;
Work voltage stabilizing end, connects the negative terminal of described high-voltage DC power supply by an electric capacity;
Current sample end, connects the source electrode of described metal-oxide-semiconductor by a sampling module; And
Pwm signal output, connects the grid of described metal-oxide-semiconductor.
Further, described division module comprises the first resistance, the second resistance, the anode of high-voltage DC power supply described in described first resistance one termination, the first end of adjustable electric pressure side described in another termination and described second resistance also exports described adjustable linear voltage, the negative terminal of high-voltage DC power supply described in second termination of described second resistance, regulates described adjustable linear voltage by directly accessing adjustable potentiometer at the negative terminal of described high-voltage DC power supply and described adjustable electric pressure side.
Further, described sampling module comprises the 3rd resistance, the 4th resistance and the 5th resistance, the current sample end of control module described in first termination of described 3rd resistance and the first end of the 4th resistance, the source electrode of metal-oxide-semiconductor described in the second termination of described 3rd resistance and the first end of described 5th resistance, the negative terminal of high-voltage DC power supply described in the second end of described 4th resistance and the second termination of described 5th resistance.
Further, described regulating filtering module comprises electric capacity of voltage regulation and common mode inductance, the first end of described electric capacity of voltage regulation is as the first input end of described regulating filtering module, connect the anode of described high-voltage DC power supply and the first input end of described common mode inductance, second end of described electric capacity of voltage regulation is as the first input end of described regulating filtering module, connect the second end of described inductor, the second input of described common mode inductance and ground, the first output of described common mode inductance and the second output connect anode and the negative terminal of described LED respectively.
Further; described control module also has overvoltage protection pin; described LED dimming power source circuit also comprises overvoltage protective module; the first input end of regulating filtering module described in its input termination; export the overvoltage protection pin of control module described in termination; described control module regulates the duty ratio of described pwm signal according to the voltage signal that described overvoltage protective module exports, or turns off described pwm signal.
Further, described overvoltage protective module comprises voltage stabilizing didoe group, the 6th resistance, the 7th resistance and photoelectrical coupler, wherein:
The negative electrode of described voltage stabilizing didoe group connects the anode of high-voltage DC power supply; anode connects the first input end of described photoelectrical coupler and the first end of described 7th resistance by described 6th resistance; second end of the 7th resistance described in the second input termination of described photoelectrical coupler and ground; first of described photoelectrical coupler exports the overvoltage protection pin of control module described in termination, the negative terminal of high-voltage DC power supply described in the second output termination.
Further, described voltage stabilizing didoe group comprises the first voltage stabilizing didoe and the second voltage stabilizing didoe, the negative electrode of described first voltage stabilizing didoe is as the negative electrode of described voltage stabilizing didoe group, anode connects the negative electrode of described second voltage stabilizing didoe, and the anode of described first voltage stabilizing didoe is as the anode of described voltage stabilizing didoe group.
Further, described control module is LED illumination driver, and chip model is: HV9861.
In addition, additionally provide a kind of LED lamp, comprise above-mentioned LED dimming power source circuit.
Above-mentioned LED dimming power source circuit and LED lamp can load adjustable signal on LED dimming power source circuit by adjustable electric pressure side, thus external signal can be utilized quickly to carry out light modulation to LED; In addition, this circuit can also realize by the source current of metal-oxide-semiconductor of sampling the brightness that negative-feedback signal regulates LED automatically.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of LED dimming power source circuit in the utility model preferred embodiment.
Embodiment
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, LED dimming power source circuit in the utility model preferred embodiment connects with high-voltage DC power supply, the anode DC+ of high-voltage DC power supply is by diode D1 output voltage signal, and the negative terminal DC-of high-voltage DC power supply is by fuse F1 output voltage signal.
LED dimming power source circuit comprises adjustable electric pressure side IN, division module 100, regulating filtering module 200, control module 300, N-type metal-oxide-semiconductor Q1, diode D2 and inductor L1.
Division module 100 connect adjustable electric pressure side IN and high-voltage DC power supply, export adjustable linear voltage; The drain electrode of metal-oxide-semiconductor Q1 connects the anode of diode D2, and the negative electrode of this diode D2 meets the anode DC+ of high-voltage DC power supply, and the drain electrode of metal-oxide-semiconductor Q1 connects the first end of inductor L1; The first input end of regulating filtering module 200 meets the anode DC+ of high-voltage DC power supply, second end of the second input termination inductor L1 of regulating filtering module 200, the first output of regulating filtering module 200 and the second output connect anode and the negative terminal of LED 10 respectively.Control module 300 is sampled the source current of metal-oxide-semiconductor Q1, and outputs to the duty ratio of the pwm signal of metal-oxide-semiconductor Q1 grid according to source current and adjustable linear voltage-regulation, with the electric current and voltage size of the anode and negative terminal access that regulate LED 10.
So, can by entering variable current or voltage signal in adjustable electric pressure side IN termination, the adjustable linear voltage exported to regulate division module 100, make control module 300 can output to the duty ratio of the pwm signal of metal-oxide-semiconductor Q1 grid according to the adjustable linear voltage-regulation of change, with the electric current and voltage size of the anode and negative terminal access that regulate LED 10.In addition, control module 300 can also according to the duty ratio of the source current regulation output of the metal-oxide-semiconductor Q1 sampled to the pwm signal of metal-oxide-semiconductor Q1 grid, the electric current and voltage size accessed with the anode and negative terminal that regulate LED 10.
In the present embodiment, control module 300 is LED illumination driver U1.Preferably, chip model is: HV9861, has:
Start end VIN, meets the anode DC+ of high-voltage DC power supply by a resistance R0, for control module 300 provides starting resistor; Grounding pin GND ground connection.
Adjustable signal input LD, connects the adjustable linear voltage of the output of division module 100;
Work voltage stabilizing end VDD, met the negative terminal DC-of high-voltage DC power supply by an electric capacity C1, the control module 300 being works under rated voltage;
Current sample end CS, connects the source electrode of metal-oxide-semiconductor Q1 by a sampling module 400;
Pwm signal output GATE, connects the grid of metal-oxide-semiconductor Q1 by a resistance, output pwm signal to metal-oxide-semiconductor Q1 to control its break-make.
Further, division module 100 comprises the first resistance R1 and the second resistance R2, the anode DC+ of the one termination high-voltage DC power supply of the first resistance R1, the first end of another termination adjustable voltage end IN and the second resistance R2 also exports adjustable linear voltage, the negative terminal DC-of the second terminated high voltage DC power supply of the second resistance R2, regulates adjustable linear voltage by directly accessing adjustable potentiometer RS at the negative terminal DC-of high-voltage DC power supply and adjustable electric pressure side IN.In other embodiments, curtage signal can be accessed with the adjustable linear voltage regulating division module 100 to export at adjustable electric pressure side IN.
Further, sampling module 400 comprises the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5, the current sample end CS of the first termination control module 300 of the 3rd resistance R3 and the first end of the 4th resistance R4, the source electrode of the second termination metal-oxide-semiconductor Q1 of the 3rd resistance R3 and the first end of the 5th resistance R5, the negative terminal DC-of second end of the 4th resistance R4 and the second terminated high voltage DC power supply of the 5th resistance R5.The electric current that sampling module 400 gathers the source electrode of metal-oxide-semiconductor Q1 is input to control module 300 after dividing potential drop.
Further, regulating filtering module 200 comprises electric capacity of voltage regulation C2 and common mode inductance LF, the first end of electric capacity of voltage regulation C2 is as the first input end of regulating filtering module 200, connect the anode DC+ of high-voltage DC power supply and the first input end of common mode inductance LF, second end of electric capacity of voltage regulation C2 is as the second input of regulating filtering module 200, connect second end of inductor L1, second input of common mode inductance LF and ground, first output of common mode inductance LF and the second output connect anode and the negative terminal of LED 10 respectively.
Further; control module 300 also has overvoltage protection pin PWMD; LED dimming power source circuit also comprises overvoltage protective module 500; the first input end of its input termination regulating filtering module 200; the i.e. first end of electric capacity of voltage regulation C2; the overvoltage protection pin PWMD of the output termination control module 300 of overvoltage protective module 500, control module 300 regulates the duty ratio of pwm signal according to the voltage signal that overvoltage protective module 500 exports, or turns off pwm signal.
In the present embodiment, overvoltage protective module 500 comprises voltage stabilizing didoe group, the 6th resistance R6, the 7th resistance R7 and photoelectrical coupler U2, and with reference to shown in figure, U2 is made up of jointly U2A and U2B two parts device.
Voltage stabilizing didoe group comprises the first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2, the negative electrode of the first voltage stabilizing didoe ZD1 is as the negative electrode of voltage stabilizing didoe group, anode connects the negative electrode of the second voltage stabilizing didoe ZD2, and the anode of the first voltage stabilizing didoe ZD1 is as the anode of voltage stabilizing didoe group.The negative electrode of voltage stabilizing didoe group meets the anode DC+ of high-voltage DC power supply; the anode of voltage stabilizing didoe group connects the first input end 1 of photoelectrical coupler U2 and the first end of the 7th resistance R7 by the 6th resistance R6; second input 2 of photoelectrical coupler U2 connects the second end and the ground of the 7th resistance R7; first output 3 of photoelectrical coupler U2 meets the overvoltage protection pin PWMD of control module 300, and the second output 4 meets the negative terminal DC-of high-voltage DC power supply.
The anode DC+ input voltage of high-voltage DC power supply is added to the adjustable signal input LD of control module 300 after the first resistance R1 and the second resistance R2 dividing potential drop, the voltage of adjustable signal input LD can realize from 0 to 250mV, the voltage first of this adjustable signal input LD is in internal current sampling end CS set point 275mV, thus exportable electric current realizes programming.
In addition, additionally provide a kind of LED 10 tool, comprise above-mentioned LED dimming power source circuit.
The above embodiment only have expressed several execution mode of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a LED dimming power source circuit, connects with high-voltage DC power supply, it is characterized in that, comprises an adjustable electric pressure side, control module, division module, regulating filtering module, N-type metal-oxide-semiconductor and inductor, wherein:
Described division module connect described adjustable electric pressure side and described high-voltage DC power supply, export adjustable linear voltage; The drain electrode of described metal-oxide-semiconductor connects the anode of a diode, and the negative electrode of this diode connects the anode of described high-voltage DC power supply, and the drain electrode of described metal-oxide-semiconductor connects the first end of described inductor;
The first input end of described regulating filtering module connects the anode of described high-voltage DC power supply, the second end of inductor described in the second input termination, and the first output and the second output connect anode and the negative terminal of LED respectively;
Described control module is sampled the source current of described metal-oxide-semiconductor, and output to the duty ratio of the pwm signal of described metal-oxide-semiconductor grid according to described source current and/or described adjustable linear voltage-regulation, with the electric current and voltage size of the anode and negative terminal access that regulate described LED.
2. LED dimming power source circuit according to claim 1, it is characterized in that, described control module has:
Start end, connects the anode of described high-voltage DC power supply;
Adjustable signal input, connects the described adjustable linear voltage of the output of described division module;
Work voltage stabilizing end, connects the negative terminal of described high-voltage DC power supply by an electric capacity;
Current sample end, connects the source electrode of described metal-oxide-semiconductor by a sampling module; And
Pwm signal output, connects the grid of described metal-oxide-semiconductor.
3. LED dimming power source circuit according to claim 1 and 2, it is characterized in that, described division module comprises the first resistance and the second resistance, the anode of high-voltage DC power supply described in described first resistance one termination, the first end of adjustable electric pressure side described in another termination and described second resistance also exports described adjustable linear voltage, the negative terminal of high-voltage DC power supply described in second termination of described second resistance, regulates described adjustable linear voltage by directly accessing adjustable potentiometer at the negative terminal of described high-voltage DC power supply and described adjustable electric pressure side.
4. LED dimming power source circuit according to claim 2, it is characterized in that, described sampling module comprises the 3rd resistance, the 4th resistance and the 5th resistance, the current sample end of control module described in first termination of described 3rd resistance and the first end of the 4th resistance, the source electrode of metal-oxide-semiconductor described in the second termination of described 3rd resistance and the first end of described 5th resistance, the negative terminal of high-voltage DC power supply described in the second end of described 4th resistance and the second termination of described 5th resistance.
5. LED dimming power source circuit according to claim 1, it is characterized in that, described regulating filtering module comprises electric capacity of voltage regulation and common mode inductance, the first end of described electric capacity of voltage regulation is as the first input end of described regulating filtering module, connect the anode of described high-voltage DC power supply and the first input end of described common mode inductance, second end of described electric capacity of voltage regulation is as the second input of described regulating filtering module, connect the second end of described inductor, second input of described common mode inductance and ground, first output of described common mode inductance and the second output connect anode and the negative terminal of described LED respectively.
6. the LED dimming power source circuit according to claim 2 or 5; it is characterized in that; described control module also has overvoltage protection pin; described LED dimming power source circuit also comprises overvoltage protective module; the first input end of regulating filtering module described in its input termination; export the overvoltage protection pin of control module described in termination, described control module regulates the duty ratio of described pwm signal according to the voltage signal that described overvoltage protective module exports, or turns off described pwm signal.
7. LED dimming power source circuit according to claim 6, is characterized in that, described overvoltage protective module comprises voltage stabilizing didoe group, the 6th resistance, the 7th resistance and photoelectrical coupler, wherein:
The negative electrode of described voltage stabilizing didoe group connects the anode of high-voltage DC power supply; anode connects the first input end of described photoelectrical coupler and the first end of described 7th resistance by described 6th resistance; second end of the 7th resistance described in the second input termination of described photoelectrical coupler and ground; first of described photoelectrical coupler exports the overvoltage protection pin of control module described in termination, the negative terminal of high-voltage DC power supply described in the second output termination.
8. LED dimming power source circuit according to claim 7, it is characterized in that, described voltage stabilizing didoe group comprises the first voltage stabilizing didoe and the second voltage stabilizing didoe, the negative electrode of described first voltage stabilizing didoe is as the negative electrode of described voltage stabilizing didoe group, anode connects the negative electrode of described second voltage stabilizing didoe, and the anode of described first voltage stabilizing didoe is as the anode of described voltage stabilizing didoe group.
9. LED dimming power source circuit according to claim 1 and 2, is characterized in that, described control module is LED illumination driver.
10. a LED lamp, is characterized in that, comprises the LED dimming power source circuit described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420736114.8U CN204291476U (en) | 2014-11-28 | 2014-11-28 | LED dimming power source circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420736114.8U CN204291476U (en) | 2014-11-28 | 2014-11-28 | LED dimming power source circuit and LED lamp |
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| CN204291476U true CN204291476U (en) | 2015-04-22 |
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| CN201420736114.8U Expired - Fee Related CN204291476U (en) | 2014-11-28 | 2014-11-28 | LED dimming power source circuit and LED lamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105764185A (en) * | 2016-03-18 | 2016-07-13 | 深圳Tcl数字技术有限公司 | AC driving mixed dimming circuit and television |
| CN105889859A (en) * | 2015-10-02 | 2016-08-24 | 蒋超 | LED rod type lighting device capable of being charged by solar energy and wind energy day and night |
| CN112671211A (en) * | 2020-12-07 | 2021-04-16 | 珠海格力电器股份有限公司 | Drive protection circuit, method and power supply circuit |
| CN114364093A (en) * | 2022-03-21 | 2022-04-15 | 杭州易会通科技有限公司 | PWM signal dimming circuit and method for three-phase alternating current power supply LED lamp |
| CN114466482A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | LED constant current source circuit and control method thereof |
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2014
- 2014-11-28 CN CN201420736114.8U patent/CN204291476U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889859A (en) * | 2015-10-02 | 2016-08-24 | 蒋超 | LED rod type lighting device capable of being charged by solar energy and wind energy day and night |
| CN105764185A (en) * | 2016-03-18 | 2016-07-13 | 深圳Tcl数字技术有限公司 | AC driving mixed dimming circuit and television |
| CN112671211A (en) * | 2020-12-07 | 2021-04-16 | 珠海格力电器股份有限公司 | Drive protection circuit, method and power supply circuit |
| CN114466482A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | LED constant current source circuit and control method thereof |
| CN114466482B (en) * | 2021-12-31 | 2023-12-29 | 珠海雷特科技股份有限公司 | LED constant current source circuit and control method thereof |
| CN114364093A (en) * | 2022-03-21 | 2022-04-15 | 杭州易会通科技有限公司 | PWM signal dimming circuit and method for three-phase alternating current power supply LED lamp |
| CN114364093B (en) * | 2022-03-21 | 2022-07-05 | 杭州易会通科技有限公司 | PWM signal dimming circuit and method for three-phase alternating current power supply LED lamp |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20150422 Termination date: 20191128 |