CN201904959U - LED drive circuit with long service life - Google Patents
LED drive circuit with long service life Download PDFInfo
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- CN201904959U CN201904959U CN2010206817884U CN201020681788U CN201904959U CN 201904959 U CN201904959 U CN 201904959U CN 2010206817884 U CN2010206817884 U CN 2010206817884U CN 201020681788 U CN201020681788 U CN 201020681788U CN 201904959 U CN201904959 U CN 201904959U
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Abstract
The utility model relates to an LED drive circuit with long service life. The LED drive circuit comprises a rectifier bridge circuit (1) for rectifying an AC supply to a DC input, and an LED light-emitting circuit (2) comprising a plurality of sets of LEDs (LED1-LED4); The LED drive circuit further comprise a low-voltage benchmark module (3), a sampling resistor circuit (4), an LED voltage-limiting circuit (5) and a feedback constant-current adjusting circuit (6), wherein the low-voltage benchmark module (3) outputs a constant low-voltage to serve as a reference voltage; the sampling resistor circuit (4) controls the current passing the LED light-emitting circuit to be the constant current through the constant current generated by the reference voltage; the LED voltage-limiting circuit (5) limits the pressure drop of the LED light-emitting circuit; and the feedback constant-current adjusting circuit (6) controls the sampling resistor circuit (4) to maintain the constant current through feedback when the load of the LED drive circuit varies, so that the current passing the LED light-emitting circuit (2) keeps constant. The LED drive circuit with long service life adopts the constant low-voltage serving as the benchmark to realize constant current, reduces the pressure drop of the LED light-emitting element, keeps the current of the LED light-emitting element constant through feedback to realize voltage-limiting and constant-current drive power supply, and meets the requirements for driving LED light-emitting element for a long time.
Description
Technical field
The utility model relates to the LED lighting technology, more specifically, relates to a kind of long-life LED illumination driving circuit.
Background technology
LED (Light Emitting Diode) is a light-emitting diode, utilizes the solid semiconductor chip as luminescent material, and when two ends add forward voltage, the charge carrier in the semiconductor takes place compound, emits superfluous energy and causes that photo emissions produces visible light.
The LED illumination has plurality of advantages, comprising: energy-efficient; Light does not contain infrared ray and ultraviolet radiation; Luminous no stroboscopic helps vision health; The dependence low-voltage direct drives, and can be suitable for battery and solar powered; The coefficient of safety height; The optical efficiency height, heating is few, or the like.Therefore, along with reaching its maturity of technology, the LED illumination is used widely.Replace existing energy-saving lamp with the LED illumination and become domestic and international a kind of development trend.
Aspect the life-span of LED illuminating product, the life-span that present LED is a light-emitting diode itself has reached 100,000 hours in theory.Yet LED is very strict to the requirement of its power driving circuit, so LED illuminating product reliability and life-span are that situation by led drive circuit directly determines.Only experiment showed, that under the prerequisite of stable constant current that keeps degree of precision of drive circuit and pressure limiting LED could guarantee that brightness evenly and work reliably and with long-term.
Yet in existing LED illuminating product, the ubiquity power driving circuit can't be stablized the situation that realizes the constant current pressure limiting, causes the quickening of LED light decay, the lost of life even damage.Though the power driving circuit performance of high-end LED illuminating product is relatively stable, adopt special chip control power supply, cost is higher, does not utilize and applies.Therefore, press for a kind of can stablizing in the existing LED illuminating product and realize that constant current pressure limiting power supply keeps lower-cost led drive circuit simultaneously.
The utility model content
Above-mentioned various defectives at existing led drive circuit, the utility model provides a kind of improved long-lived led drive circuit, it adopts low-voltage as benchmark, effectively reduce the pressure drop of LED illuminating circuit, and can provide stable constant current by feedback, thereby realized pressure limiting and constant current power supply, reached the purpose that makes LED illuminating circuit longevity, and can keep lower cost the LED illuminating circuit.
Long-lived led drive circuit of the present utility model comprises: rectifier circuit (1) is the direct current input with the Alternating Current Power Supply rectification; And LED illuminating circuit (2), form by the some groups of LED (LED1-LED4) that connect; It is characterized in that, also comprise:
Low-voltage base modules (3) is exported constant low-voltage as reference voltage;
Sample resistance circuit (4) produces constant current by described reference voltage, and control flows is a constant current through the electric current of LED illuminating circuit;
LED pressure limiting circuit (5), the pressure drop on the restriction LED illuminating circuit;
Circuit (6) is adjusted in the feedback constant current, when the load variations of led drive circuit, keeps described constant current by FEEDBACK CONTROL sample resistance circuit (4), is constant current with the electric current of the LED illuminating circuit (2) that keeps flowing through.
Preferably, wherein, described sample resistance circuit (4) comprises the parallel circuits of first, second sample resistance (R6, R7); Described LED pressure limiting circuit (5) comprises the parallel circuits and the 3rd divider resistance (R2) of first, second divider resistance (R4, R5); And the reference voltage output end of described low-voltage base modules (3) connects the parallel circuits of described first, second divider resistance (R4, R5); The parallel circuits of first, second divider resistance (R4, R5) is connected with the parallel circuits of described first, second sample resistance (R6, R7), and be connected serially to the direct current input of described rectifier circuit (1) by described the 3rd divider resistance (R2), reduce pressure drop on the LED illuminating circuit (2) by first, second divider resistance (R4, R5) and the 3rd divider resistance (R2).And wherein, the reference voltage of described low-voltage base modules (3) output is 1.24V.Still more preferably, described low-voltage base modules (3) is TL432 (U1), and the reference utmost point by TL432 (U1) is as reference voltage output end.
Preferably, it is MOSFET triode (Q1) that circuit is adjusted in described feedback constant current, and the negative pole of the D utmost point of MOSFET triode (Q1) connection LED illuminating circuit 2, and the positive pole of LED illuminating circuit (2) connects the direct current input of described rectifier circuit (1); The S utmost point of MOSFET triode (Q1) is by the parallel circuits ground connection of described first, second sample resistance (R6, R7); The G utmost point of MOSFET triode (Q1) is connected to described low-voltage base modules (3) and constitutes feedback loop.
The utility model adopts the constant low-voltage of low-voltage base modules to realize constant current as benchmark, reduced the voltage of sample resistance circuit, and by the pressure drop on the divider resistance value reduction LED light-emitting component of adjusting the LED pressure limiting circuit, the current constant that keeps the LED light-emitting component by feedback, thereby realize the pressure limiting constant-current driving power supply, satisfy the long-lived requirement that drives of LED light-emitting component.
Description of drawings
Fig. 1 is the electrical block diagram of the long-lived led drive circuit of the utility model embodiment.
Embodiment
By describing technology contents of the present utility model, structural feature in detail, realized purpose and effect, give explanation below in conjunction with embodiment and conjunction with figs. are detailed.
Fig. 1 is the electrical block diagram of the long-lived led drive circuit of the utility model embodiment.As shown in Figure 1, described long-lived led drive circuit comprises rectifier circuit 1, is made up of rectifier bridge D2 and capacitor C 1 and C2, and being used for the Alternating Current Power Supply rectification is the direct current input.Led drive circuit also comprises LED illuminating circuit 2, is made up of the some groups of LED that connect, and for example, the LED illuminating circuit 2 shown in Fig. 1 comprises two groups of series LEDs, i.e. LED1, LED 3 and LED2, LED4.
Described long-lived led drive circuit is realized constant current with constant low-voltage as reference voltage.As Fig. 1, the constant low-voltage of low-voltage base modules 3 outputs is as reference voltage.In the present embodiment, this module can adopt TL432 chip U1.The TL432 chip is this area voltage stabilizing chip commonly used, it is with reference to extremely exporting the constant low-voltage of 1.24V, in the present embodiment with the plus earth of TL432 chip U1, negative pole is connected to the direct current output of rectifier circuit 1 by resistance R 1 and diode D1, with reference to the utmost point as reference voltage output end, thereby as reference voltage, on the sample resistance circuit, generate constant current with the constant low-voltage of 1.24V.TL431 commonly used in the state of the art provides 2.4V voltage as reference voltage, adopts the constant low-voltage of 1.24V as lower reference voltage in the utility model, effectively reduces the voltage on the sample resistance circuit.
Sample resistance circuit 4 produces constant current by described reference voltage, and control flows is a constant current through the electric current of LED illuminating circuit 2.Sample resistance circuit 4 comprises the parallel circuits of the first sample resistance R6, the second sample resistance R7, because reference voltage is constant, making the electric current of flow through R6 and R7 is a constant current, thereby makes the electric current of the LED illuminating circuit 2 of flowing through also be constant current.LED pressure limiting circuit 5 is used to limit the pressure drop on the LED illuminating circuit; Described LED pressure limiting circuit 5 comprises parallel circuits and the 3rd divider resistance R2 of the first divider resistance R4, the second divider resistance R5.As shown in Figure 1, the reference voltage output end of described low-voltage base modules 3 connects the parallel circuits that described first, second divider resistance R4, R5 form; The parallel circuits other end of first, second divider resistance R4, R5 is connected with the parallel circuits of described first, second sample resistance R6, R7, and is connected serially to the direct current input of described rectifier circuit 1 by described the 3rd divider resistance R2.Thereby, by the resistance value of first, second divider resistance of appropriate design R4, R 5 and the 3rd divider resistance R2, can control the pressure drop that reduces on the LED illuminating circuit 2, thereby satisfy the requirement that the long-lived necessary pressure limiting of LED drives.
When the load variations of led drive circuit, the feedback constant current is adjusted circuit 6 and is kept described constant current by feedback loop control sample resistance circuit 4, is constant current with the electric current of the LED illuminating circuit 2 that keeps flowing through, thereby realizes more stable constant-current driving.As Fig. 1, it is MOSFET triode Q1 that circuit is adjusted in described feedback constant current, and the negative pole of the D utmost point of MOSFET triode Q1 connection LED illuminating circuit 2, and the positive pole of LED illuminating circuit 2 connects the direct current input of described rectifier circuit 1; The S utmost point of MOSFET triode Q1 is by the parallel circuits ground connection of described first, second sample resistance R6, R7; The negative pole that the G utmost point of MOSFET triode Q1 is connected to the TL432 of described low-voltage base modules 3 constitutes feedback loop.Q1 keeps certain conducting state, when the load variations of led drive circuit, the feedback that obtains from sample resistance circuit 4 is also along with variation, causes the conducting state of Q1 to change and carries out feedback adjusting, makes the electric current of first, second sample resistance R6, R7 keep constant.Thereby LED illuminating circuit 2 can obtain a constant current value, and can not be subjected to the change of load and magnitude of voltage and change, and forms high-precision constant-current source.
Long-lived led drive circuit of the present utility model realizes that by low reference voltage and the feedback constant current adjustment circuit of TL432 high-precision constant current and pressure limiting drive, has following advantage: under the prerequisite that satisfies the low-cost requirement in market, provide resistance step-down constant-current drive circuit and high precision constant current power supply, guaranteed the life-span of LED luminous component; The led drive circuit no electrolytic capacitor, all devices all can reach nearly 100,000 hours working life, and bridge rectifier is supported AC and DC power supply, directionless requirement; Constant current accuracy reaches 1% scope, satisfies the drive characteristic of LED fully, is suitable for substituting existing product on the market.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (5)
1. long-lived led drive circuit comprises:
Rectifier circuit (1) is the direct current input with the Alternating Current Power Supply rectification, and
LED illuminating circuit (2) is made up of the some groups of LED (LED1-LED4) that connect;
It is characterized in that, also comprise:
Low-voltage base modules (3) is exported constant low-voltage as reference voltage;
Sample resistance circuit (4) produces constant current by described reference voltage, and control flows is a constant current through the electric current of LED illuminating circuit;
LED pressure limiting circuit (5), the pressure drop on the restriction LED illuminating circuit;
Circuit (6) is adjusted in the feedback constant current, when the load variations of led drive circuit, keeps described constant current by FEEDBACK CONTROL sample resistance circuit (4), is constant current with the electric current of the LED illuminating circuit (2) that keeps flowing through.
2. long-lived led drive circuit according to claim 1 is characterized in that, described sample resistance circuit (4) comprises the parallel circuits of first, second sample resistance (R6, R7); Described LED pressure limiting circuit (5) comprises the parallel circuits and the 3rd divider resistance (R2) of first, second divider resistance (R4, R5); And the reference voltage output end of described low-voltage base modules (3) connects the parallel circuits of described first, second divider resistance (R 4, R5); The parallel circuits of first, second divider resistance (R4, R5) is connected with the parallel circuits of described first, second sample resistance (R6, R7), and be connected serially to the direct current input of described rectifier circuit (1) by described the 3rd divider resistance (R2), reduce pressure drop on the LED illuminating circuit (2) by first, second divider resistance (R4, R5) and the 3rd divider resistance (R2).
3. long-lived led drive circuit according to claim 2 is characterized in that, the reference voltage of described low-voltage base modules (3) output is 1.24V.
4. long-lived led drive circuit according to claim 3 is characterized in that, described low-voltage base modules (3) is TL432, and the reference utmost point by TL432 is as reference voltage output end.
5. long-lived led drive circuit according to claim 2, it is characterized in that, it is MOSFET triode (Q1) that circuit is adjusted in described feedback constant current, and the D utmost point of MOSFET triode (Q1) connects the negative pole of LED illuminating circuit 2, and the positive pole of LED illuminating circuit (2) connects the direct current input of described rectifier circuit (1); The S utmost point of MOSFET triode (Q1) is by the parallel circuits ground connection of described first, second sample resistance (R6, R7); The G utmost point of MOSFET triode (Q1) is connected to described low-voltage base modules (3) and constitutes feedback loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206817884U CN201904959U (en) | 2010-12-27 | 2010-12-27 | LED drive circuit with long service life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206817884U CN201904959U (en) | 2010-12-27 | 2010-12-27 | LED drive circuit with long service life |
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| CN201904959U true CN201904959U (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206817884U Expired - Fee Related CN201904959U (en) | 2010-12-27 | 2010-12-27 | LED drive circuit with long service life |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103068107A (en) * | 2012-11-08 | 2013-04-24 | 陈盛文 | Light-emitting diode (LED) drive circuit |
| CN104869698A (en) * | 2015-04-20 | 2015-08-26 | 付志民 | Medical headlamp circuit |
| WO2016041121A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Led drive power supply |
| CN110246369A (en) * | 2019-07-22 | 2019-09-17 | 西南交通大学 | A kind of parking stall measure system and detection method |
-
2010
- 2010-12-27 CN CN2010206817884U patent/CN201904959U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103068107A (en) * | 2012-11-08 | 2013-04-24 | 陈盛文 | Light-emitting diode (LED) drive circuit |
| WO2016041121A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Led drive power supply |
| CN104869698A (en) * | 2015-04-20 | 2015-08-26 | 付志民 | Medical headlamp circuit |
| CN110246369A (en) * | 2019-07-22 | 2019-09-17 | 西南交通大学 | A kind of parking stall measure system and detection method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20151227 |
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| EXPY | Termination of patent right or utility model |