CN205093010U - Light -emitting diode (LED) driving circuit - Google Patents
Light -emitting diode (LED) driving circuit Download PDFInfo
- Publication number
- CN205093010U CN205093010U CN201520822121.4U CN201520822121U CN205093010U CN 205093010 U CN205093010 U CN 205093010U CN 201520822121 U CN201520822121 U CN 201520822121U CN 205093010 U CN205093010 U CN 205093010U
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- connects
- drive circuit
- led drive
- stage unit
- trigger
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Abstract
The utility model is suitable for an integrated circuit field provides a light -emitting diode (LED) driving circuit, include: first switch tube, second switch pipe, turn -on signal generator, shutoff signal comparison ware, trigger, driver stage unit. The grid of first switch tube and second switch pipe is even driven by the driver stage unit together, constitutes the power switch pipe, undertakes the effect that flows in the power electric current, the turn -on signal generator provides respectively with shutoff signal comparison ware and opens and turn -off the signal, and synthetic switching signal sent the driver stage unit to after the trigger was received and is opened and turn -off the signal, and the drive function of power tube is realized to the driver stage unit.
Description
Technical field
The utility model belongs to integrated circuit fields, particularly relates to a kind of LED drive circuit.
Background technology
Fig. 1 shows existing LED drive circuit, holds pin, feedback voltage pin FB, switching tube M1, sampling resistor R1, start signal generator, cut-off signals comparator, trigger, driving stage unit comprising grounding pin gnd, power pins VCC, DRAIN.
Fig. 2 shows a kind of application circuit of the existing LED drive circuit of Fig. 1, and four diodes D0, D3, D4, D8 add an electric capacity C1 and form rectifier bridge, AC power VSN rectification are gone out a direct voltage; Resistance R2, electric capacity C2, diode D9 form absorbing circuit, occur too high peak voltage for preventing the drain electrode of switching tube M1; Starting resistance R10, electric capacity C3 and diode D10 form power supply circuits, power for giving power pins VCC; Resistance R4 and R5 forms feedback circuit, inputs a feedback signal for giving feedback voltage pin FB; Transformer T1 is made up of former limit, secondary and three grades, auxiliary limit; Output stage is made up of diode D11, electric capacity C4 and load led.
The operation principle of this application circuit is that starting resistance R10 charges to electric capacity C3, after the voltage of VCC pin reaches certain value, the LED drive circuit of Fig. 1 is started working, switching tube M1 opens, voltage on sampling resistor R1 starts to rise, after rising to inner VREF value, cut-off signals comparator sends out cut-off signals to trigger, through driving stage unit, switching tube M1 is turned off.After switching tube M1 turns off, the electric current of M1 becomes 0, and the energy of transformer T1 transfers to secondary by former limit, and transformer enters the demagnetization cycle, Power supply led load.After feedback circuit detects that demagnetization completes, send start signal to trigger by start signal generator, through driving stage unit, then open switching tube M1, carry out the action of switch so again and again.
Utility model content
The purpose of this utility model is to provide a kind of LED drive circuit, is intended to solve existing application circuit more complicated, the problem that cost is higher.
LED drive circuit involved by the utility model, comprise grounding pin gnd, sampling resistor R1, start signal generator, driving stage unit, it is characterized in that, described LED drive circuit also comprises:
Power pins VCC, for inputting starting resistor or supply power voltage;
DRAIN holds pin, for introducing power switch electric current or providing charging current to described power pins VCC;
First switching tube M1, its drain electrode connects described DRAIN and holds pin, and grid connects the output of described driving stage unit, and source electrode connects the first input end of described start signal generator;
Second switch pipe M2, its drain electrode connects the source electrode of described first switching tube M1, and grid connects the output of described driving stage unit, and source electrode connects the first end of described sampling resistor R1;
Cut-off signals comparator, the first input end of described cut-off signals comparator connects the first end of described sampling resistor R1, and the second input of described cut-off signals comparator connects benchmark VREF; And
Trigger, the first input end of described trigger connects the output of described start signal generator, and the second input of described trigger connects the output of described cut-off signals comparator, and the output of described trigger connects the input of described driving stage unit,
Second input of described start signal generator connects described power pins VCC,
Second end of described sampling resistor R1 connects described grounding pin gnd.
In the utility model, alternatively, also comprise voltage-stabiliser tube ZD1, the anode of described voltage-stabiliser tube ZD1 connects described grounding pin gnd, and negative electrode connects the source electrode of described first switching tube M1.
In the utility model, alternatively, described trigger is rest-set flip-flop.
In the utility model, alternatively, described trigger is d type flip flop.
In the utility model, alternatively, described start signal generator, by detecting the described first switching tube M1 of series connection and the intermediate point of described second switch pipe M2, determines the current zero-crossing point flow through.
In the utility model, alternatively, described driving stage unit has an output.
Accompanying drawing explanation
Fig. 1 is the structure chart of existing LED drive circuit;
Fig. 2 is the structure chart of the application circuit of existing LED drive circuit;
The structure chart of the LED drive circuit of Fig. 3 involved by execution mode of the present utility model;
The structure chart of the application circuit of the LED drive circuit of Fig. 4 involved by execution mode of the present utility model;
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage 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.
In the present embodiment, utilize switching tube to be connected in series, from the intermediate connection point receiving feedback signals of tandem tap pipe, by peripheral applications circuit reduction, reach system board succinct, the effect that cost reduces.
Fig. 3 illustrates the structure of the LED drive circuit involved by execution mode of the present utility model, for convenience of explanation, illustrate only the part relevant to the utility model.
As the LED drive circuit involved by present embodiment, comprise grounding pin gnd, sampling resistor R1, start signal generator 201, driving stage unit 204, it is characterized in that, LED drive circuit also comprises:
Power pins VCC, for inputting starting resistor or supply power voltage;
DRAIN holds pin, for introducing power switch electric current or providing charging current to power pins VCC;
First switching tube M1, its drain electrode connects DRAIN and holds pin, and grid connects the output of driving stage unit 204, and source electrode connects the first input end of start signal generator 201;
Second switch pipe M2, the source electrode of its drain electrode connection first switching tube M1, grid connects the output of driving stage unit 204, and source electrode connects the first end of sampling resistor R1;
Cut-off signals comparator 202, the first input end of cut-off signals comparator 202 connects the first end of sampling resistor R1, and the second input of cut-off signals comparator 202 connects internal voltage reference VREF;
Trigger 203, the first input end of trigger 203 connects the output of start signal generator 201, and the second input of trigger 203 connects the output of cut-off signals comparator 202, and the output of trigger 203 connects the input of driving stage unit 204;
Voltage-stabiliser tube ZD1, the anode of voltage-stabiliser tube ZD1 connects grounding pin gnd, the negative electrode of voltage-stabiliser tube ZD1 connects the source electrode of the first switching tube M1, voltage-stabiliser tube ZD1 can play the effect of pressure limiting, make the magnitude of voltage that the voltage of the tie point between the first switching tube M1 and second switch pipe M2 can not be limit higher than voltage-stabiliser tube ZD1, thus play a protective role;
Second input of start signal generator 201 connects power pins VCC;
Second end of sampling resistor R1 connects grounding pin gnd.
Fig. 4 illustrates the structure of the application circuit of the LED drive circuit involved by execution mode of the present utility model, for convenience of explanation, illustrate only the part relevant to the utility model.
The application circuit of this LED drive circuit can be used in light fixture and LED drive circuit.
Application circuit as the LED drive circuit involved by execution mode of the present utility model includes rectification circuit, rectification circuit is made up of four diodes D0, D3, D4, D8 and an electric capacity C1, or rectification circuit is made up of an a diode D3 and electric capacity C1, it is characterized in that, application circuit also comprises:
Transformer T1, transformer T1 are made up of former limit and secondary two-stage, and the Same Name of Ends on former limit connects the output of rectification circuit, and the different name end on former limit connects the DRAIN end pin of LED drive circuit;
The positive pole of VCC filter capacitor C3, filter capacitor C3 is connected to the power pins VCC of LED drive circuit, and the negative pole of filter capacitor C3 is connected to the grounding pin gnd of LED drive circuit;
Output-stage circuit, output-stage circuit is composed in series by diode D11 and electric capacity C4, the anode of diode D11 is connected with the different name end of the secondary of transformer T1 as the first input end of output-stage circuit, the negative pole of electric capacity C4 is connected with the Same Name of Ends of the secondary of transformer T1 as the second input of output-stage circuit, and the intermediate connection point of diode D11 and electric capacity C4 is as the output of output-stage circuit.
These are only preferred embodiment 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 (6)
1. a LED drive circuit, comprise grounding pin gnd, sampling resistor R1, start signal generator, driving stage unit, it is characterized in that, described LED drive circuit also comprises:
Power pins VCC, for inputting starting resistor or supply power voltage;
DRAIN holds pin, for introducing power switch electric current or providing charging current to described power pins VCC;
First switching tube M1, its drain electrode connects described DRAIN and holds pin, and grid connects the output of described driving stage unit, and source electrode connects the first input end of described start signal generator;
Second switch pipe M2, its drain electrode connects the source electrode of described first switching tube M1, and grid connects the output of described driving stage unit, and source electrode connects the first end of described sampling resistor R1;
Cut-off signals comparator, the first input end of described cut-off signals comparator connects the first end of described sampling resistor R1, and the second input of described cut-off signals comparator connects benchmark VREF; And
Trigger, the first input end of described trigger connects the output of described start signal generator, and the second input of described trigger connects the output of described cut-off signals comparator, and the output of described trigger connects the input of described driving stage unit,
Second input of described start signal generator connects described power pins VCC,
Second end of described sampling resistor R1 connects described grounding pin gnd.
2. LED drive circuit as claimed in claim 1, it is characterized in that, also comprise voltage-stabiliser tube ZD1, the anode of described voltage-stabiliser tube ZD1 connects described grounding pin gnd, and negative electrode connects the source electrode of described first switching tube M1.
3. LED drive circuit as claimed in claim 1, it is characterized in that, described trigger is rest-set flip-flop.
4. LED drive circuit as claimed in claim 1, it is characterized in that, described trigger is d type flip flop.
5. LED drive circuit as claimed in claim 1, is characterized in that, described start signal generator, by detecting the described first switching tube M1 of series connection and the intermediate point of described second switch pipe M2, determines the current zero-crossing point flow through.
6. LED drive circuit as claimed in claim 1, it is characterized in that, described driving stage unit has an output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822121.4U CN205093010U (en) | 2015-10-22 | 2015-10-22 | Light -emitting diode (LED) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822121.4U CN205093010U (en) | 2015-10-22 | 2015-10-22 | Light -emitting diode (LED) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205093010U true CN205093010U (en) | 2016-03-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520822121.4U Expired - Fee Related CN205093010U (en) | 2015-10-22 | 2015-10-22 | Light -emitting diode (LED) driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205093010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105208737A (en) * | 2015-10-22 | 2015-12-30 | 南宁市桂芯微电子科技有限公司 | LED drive circuit |
-
2015
- 2015-10-22 CN CN201520822121.4U patent/CN205093010U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105208737A (en) * | 2015-10-22 | 2015-12-30 | 南宁市桂芯微电子科技有限公司 | LED drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190121 Address after: 518000 Building A 6088, Yikang Business Building, 33 Huarong Road, Dalang Street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Lixin Microelectronics Co., Ltd. Address before: 530007 No. 1213, 12th Floor, Office Building, 2nd Group, 10th Team, Luolai Village, 89 Gaoxin Avenue, Nanning City, Guangxi Zhuang Autonomous Region Patentee before: NANNING GUIXIN MICROELECTRONICS TECHNOLOGY CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160316 Termination date: 20191022 |