CN201937914U - Light-emitting diode (LED) drive circuit - Google Patents
Light-emitting diode (LED) drive circuit Download PDFInfo
- Publication number
- CN201937914U CN201937914U CN2010206973736U CN201020697373U CN201937914U CN 201937914 U CN201937914 U CN 201937914U CN 2010206973736 U CN2010206973736 U CN 2010206973736U CN 201020697373 U CN201020697373 U CN 201020697373U CN 201937914 U CN201937914 U CN 201937914U
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- Prior art keywords
- isolating transformer
- factor correction
- led
- power factor
- correction controller
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a light-emitting diode (LED) drive circuit which utilizes devices, such as a power factor correction controller, an isolation transformer, a ceramic capacitor and the like, thereby enabling the LED in the lamps and the drive circuit of the LED to have matched service life and being capable of effectively ensuring the stable light of the LED.
Description
Technical field
The utility model relates to a kind of led drive circuit.
Background technology
Existing led drive circuit has electrochemical capacitor in the circuit, because the electrochemical capacitor employing is that electrolyte is as medium.When the amount of electrolyte reduced to certain limit, the electric capacity life-span had also just stopped.The electrochemical capacitor non-refractory, the life-span of electrochemical capacitor and temperature have exponential relation.The leakage current of electrochemical capacitor is bigger, so electrochemical capacitor was easily lost efficacy by electrical network surge and impacting with high pressure.(ESR) is bigger for equivalent series resistance, so ripple current and operating frequency can cause that all electrochemical capacitor easily lost efficacy.Based on above known reason, what the life-span of current electrolysis electric capacity was general has only several thousand hours, the longest also can only reach 20,000 hours, thereby be complementary 50,000 hours average lives of very difficult and LED, this has just caused the LED in the light fixture and has not seriously matched the useful life of its drive circuit, has so just caused the wasting of resources.
In addition, the circuit structure of existing led drive circuit is too simple, can't guarantee the current stabilization of led array, influences the luminous efficiency and the useful life of led array.
The utility model content
The utility model wants the technical solution problem to provide a kind of led drive circuit, this led drive circuit adopts devices such as power factor correction controller, isolating transformer and ceramic capacitor, make in the light fixture LED and be complementary the useful life of its drive circuit, and can ensure effectively that LED is luminous stable.
The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:
A kind of led drive circuit, the dc voltage output end of current rectifying and wave filtering circuit is held through the MULT that first resistance connects power factor correction controller, and the ground end of current rectifying and wave filtering circuit is the ground of led drive circuit, the GND end ground connection of power factor correction controller; The dc voltage output end of current rectifying and wave filtering circuit connects the 1st end of isolating transformer, the D utmost point of the 2nd termination metal-oxide-semiconductor of isolating transformer, and the G utmost point of metal-oxide-semiconductor joins by the GD end of second resistance and power factor correction controller; The S utmost point of metal-oxide-semiconductor joins by the CS end of the 3rd resistance and power factor correction controller; The S utmost point of metal-oxide-semiconductor is by the 5th grounding through resistance; The power supply termination dc power supply terminal of power factor correction controller;
The 3rd pin of isolating transformer connects the positive pole of diode, and the negative pole of diode is a dc power supply terminal, and first ceramic condenser is connected across between dc power supply terminal and the ground, the 4th pin ground connection of isolating transformer;
Second ceramic condenser is connected across between the 5th end and the 6th end of isolating transformer; The public positive pole of the 6th termination led array of isolating transformer is connected to the 4th resistance between the 5th end of isolating transformer and the public negative pole of led array;
The public negative pole of an input termination led array of operational amplifier, another input termination reference voltage of operational amplifier; The 1st pin of the output termination optocoupler of operational amplifier; The 2nd pin of optocoupler connects the 6th end of isolating transformer; The 3rd pin ground connection of optocoupler; The 3rd pin of optocoupler connects the INV end of power factor correction controller.
Described first ceramic electrical perhaps second ceramic condenser is formed in parallel by a plurality of ceramic condenser monomers.
Current rectifying and wave filtering circuit is the bridge rectifier of routine and the ripe circuit that capacitor filtering combines.
The beneficial effects of the utility model:
Led drive circuit of the present utility model adopts devices such as power factor correction controller, isolating transformer and ceramic capacitor, because ceramic condenser and electrochemical capacitor are relatively, its advantage is more high temperature resistant, nonpolarity, easy to use, (ESR) is little for equivalent series resistance, and the average life of life-span and LED is suitable; Power factor correction controller can effectively ensure power supply quality, adopts isolating transformer can effectively reduce the current interference of power end to LED, ensures the LED steady operation.Therefore, led drive circuit of the present utility model make in the light fixture LED and be complementary the useful life of its drive circuit, and can ensure effectively that LED is luminous stable.
Description of drawings
Fig. 1 is the led drive circuit schematic diagram.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
As shown in Figure 1, a kind of led drive circuit is characterized in that, the dc voltage output end of current rectifying and wave filtering circuit connects the MULT end of power factor correction controller TC1 through first resistance R 1, the ground end of current rectifying and wave filtering circuit is the ground of led drive circuit, the GND end ground connection of power factor correction controller; The dc voltage output end of current rectifying and wave filtering circuit connects the 1st end of isolating transformer T1, the D utmost point of the 2nd termination metal-oxide-semiconductor QS1 of isolating transformer T1, and the G utmost point of metal-oxide-semiconductor QS1 joins by the GD end of second resistance R 2 with power factor correction controller; The S utmost point of metal-oxide-semiconductor QS1 joins by the CS end of the 3rd resistance R 3 with power factor correction controller; The S utmost point of metal-oxide-semiconductor QS1 is by the 5th resistance R 5 ground connection; The power supply termination dc power supply terminal VCC of power factor correction controller;
The 3rd pin of isolating transformer connects the positive pole of diode D6, and the negative pole of diode D6 is dc power supply terminal VCC, and the first ceramic condenser Cvccs is connected across between dc power supply terminal and the ground, the 4th pin ground connection of isolating transformer;
The second ceramic condenser Couts is connected across between the 5th end and the 6th end of isolating transformer T1; The public positive pole of the 6th termination led array LEDS of isolating transformer T1 is connected to the 4th resistance R 4 between the 5th end of isolating transformer T1 and the public negative pole of led array LEDS;
The public negative pole of the input termination led array LEDS of operational amplifier IC2, another input termination reference voltage Vref of operational amplifier IC2; The 1st pin of the output termination optocoupler IC3 of operational amplifier IC2; The 2nd pin of optocoupler IC3 connects the 6th end of isolating transformer T1; The 3rd pin ground connection of optocoupler; The 3rd pin of optocoupler connects the INV end of power factor correction controller.
Described first ceramic condenser (Cvccs) or second ceramic condenser (Couts) are formed in parallel by a plurality of ceramic condenser monomers.
IC1 is that power factor correction (PFC) controller, R1 are that the provide detection signal, the T1 that finish power factor correction by giving IC1 after its step-down is that the 3-4 coil windings of high-frequency isolation transformer, T1 is auxiliary winding, by diode D6 rectification, to the 1-2 coil windings of IC power supply, T1, it is that many again groups composed in parallel after a plurality of LED connected to LED power supply, LEDS that metal-oxide-semiconductor QS1, R2, R3, R5, R4 and operational amplifier IC2, photoelectrical coupler IC3 form constant-current circuit together behind the first ceramic condenser Cvccs filter shape that a plurality of ceramic condensers are formed.
The second ceramic condenser Couts that is made up of a plurality of ceramic paster electric capacity makes the output smoothing electric current to ensure the LED steady operation.
The specification and the model of each device in the circuit are as follows:
The model of power factor correction controller: ST6562/0B6563;
T1 model: 20WDJ-T2-3;
Electric capacity, resistance model: SMD1206/SMD0805;
Amplifier: LM358;
Optocoupler model: PC817;
QS1：AUK8N60；
The magnitude of voltage that Vref is: 2.5V;
LEDs is: 12 strings 30 also;
Cvccs is the parallel connection of 6 SMD1206 encapsulation 16V10UF electric capacity;
Couts is the parallel connection of 50 SMD1206 encapsulation 50V4.7UF electric capacity.
Claims (2)
1. led drive circuit, it is characterized in that, the dc voltage output end of current rectifying and wave filtering circuit is held through the MULT that first resistance (R1) connects power factor correction controller (TC1), and the ground end of current rectifying and wave filtering circuit is the ground of led drive circuit, the GND end ground connection of power factor correction controller; The dc voltage output end of current rectifying and wave filtering circuit connects the 1st end of isolating transformer (T1), the D utmost point of the 2nd termination metal-oxide-semiconductor (QS1) of isolating transformer (T1), and the G utmost point of metal-oxide-semiconductor (QS1) joins by the GD end of second resistance (R2) with power factor correction controller; The S utmost point of metal-oxide-semiconductor (QS1) joins by the CS end of the 3rd resistance (R3) with power factor correction controller; The S utmost point of metal-oxide-semiconductor (QS1) is by the 5th resistance (R5) ground connection; The power supply termination dc power supply terminal (VCC) of power factor correction controller;
The 3rd pin of isolating transformer connects the positive pole of diode (D6), and the negative pole of diode (D6) is dc power supply terminal (VCC), and first ceramic condenser (Cvccs) is connected across between dc power supply terminal and the ground, the 4th pin ground connection of isolating transformer;
Second ceramic condenser (Couts) is connected across between the 5th end and the 6th end of isolating transformer (T1); The public positive pole of the 6th termination led array (LEDS) of isolating transformer (T1) is connected to the 4th resistance (R4) between the public negative pole of the 5th end of isolating transformer (T1) and led array (LEDS);
The public negative pole of an input termination led array (LEDS) of operational amplifier (IC2), another input termination reference voltage (Vref) of operational amplifier (IC2); The 1st pin of the output termination optocoupler (IC3) of operational amplifier (IC2); The 2nd pin of optocoupler (IC3) connects the 6th end of isolating transformer (T1); The 3rd pin ground connection of optocoupler; The 3rd pin of optocoupler connects the INV end of power factor correction controller.
2. led drive circuit according to claim 1 is characterized in that, described first ceramic condenser (Cvccs) or second ceramic condenser (Couts) are formed in parallel by a plurality of ceramic condenser monomers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206973736U CN201937914U (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206973736U CN201937914U (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937914U true CN201937914U (en) | 2011-08-17 |
Family
ID=44449415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206973736U Expired - Fee Related CN201937914U (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201937914U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925621A (en) * | 2013-01-16 | 2014-07-16 | 广东美的厨房电器制造有限公司 | Microwave oven and control method thereof |
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
| CN106507654A (en) * | 2016-10-14 | 2017-03-15 | 国网上海市电力公司 | A kind of anti-interference isolation and communication device for extra-high voltage equipment vibration-testing |
-
2010
- 2010-12-31 CN CN2010206973736U patent/CN201937914U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925621A (en) * | 2013-01-16 | 2014-07-16 | 广东美的厨房电器制造有限公司 | Microwave oven and control method thereof |
| CN103925621B (en) * | 2013-01-16 | 2016-08-03 | 广东美的厨房电器制造有限公司 | Microwave oven and control method thereof |
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
| CN106507654A (en) * | 2016-10-14 | 2017-03-15 | 国网上海市电力公司 | A kind of anti-interference isolation and communication device for extra-high voltage equipment vibration-testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHENZHEN HOMI LIGHTING CO., LTD. Assignor: Shenzhen Siolux Lighting Technology Co., Ltd. Contract record no.: 2014440020101 Denomination of utility model: LED drive circuit and portable lamp Granted publication date: 20110817 License type: Exclusive License Record date: 20140403 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Shenzhen Siolux Lighting Technology Co., Ltd. Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Shenzhen Siolux Lighting Technology Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20141231 |
|
| EXPY | Termination of patent right or utility model |