CN201878375U - LED (light-emitting diode) constant-voltage and constant-current driving circuit - Google Patents
LED (light-emitting diode) constant-voltage and constant-current driving circuit Download PDFInfo
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- CN201878375U CN201878375U CN2010205539580U CN201020553958U CN201878375U CN 201878375 U CN201878375 U CN 201878375U CN 2010205539580 U CN2010205539580 U CN 2010205539580U CN 201020553958 U CN201020553958 U CN 201020553958U CN 201878375 U CN201878375 U CN 201878375U
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Abstract
The utility model relates to a driving power circuit, in particular to an LED (light-emitting diode) constant-voltage and constant-current driving power circuit which comprises a bridge-type rectifying unit, a current-limiting resistor, a filtering unit and a constant-voltage and constant-current driving circuit consisting of a capacitor unit and a switching triode; a full-wave rectification bridge formed by diodes D1-D4 is used for conversion between alternating current (AC) and direct current (DC), a remote control (RC) filtering unit is used for filtering, and a semiconductor triode Q1 is used for switch voltage stabilization. By adopting the technical scheme, the LED constant-voltage and constant-current driving power circuit is realized. The circuit is simple and low in cost, and realizes constant-voltage and constant-current driving of LED lighting lamps.
Description
Technical field
The utility model relates to driving power circuit, relates in particular to the driving power circuit of LED constant pressure and flow.
Background technology
Along with the development of electric light source technology, human lighting system is also constantly progressive.Especially the proposition of light-emitting diode (LED) technology, it is exactly a kind of typical semiconductor recombination luminescence light source.The principle of luminosity of light-emitting diode (LED) is the compound light that sends of semi-conductive particle when utilizing electric current to flow through semiconductor chip.Because LED is a kind of illumination mode that electric energy can be converted into visible light, therefore have above-mentioned two kinds of traditional lighting systems incomparable advantage.It has that volume is little, consuming electric power is low, the advantage of environmental protection more, sturdy and durable, long service life.
Though can reach the useful life of LED more than at least 2.5 ten thousand～50,000 hours, be much higher than other lightings (for example 8000 of electricity-saving lamp hours), but the operating circuit of LED is a low-voltage dc power supply, other lightings are higher relatively to power requirement, therefore need special LED driving power plate that driving power is provided.Yet the power driving circuit of existing AC-DC conversion is the isolated buck circuit, and the current/voltage of drive circuit dc output end still can be subjected to the influence of fluctuations of input alternating current voltage, changes and glimmers thereby make the LED of driving that brightness take place.More extreme is, in case after the peak of fluctuation voltage has surpassed the constant withstand voltage of LED, can damage LED.Therefore, existing power driving circuit is not suitable for the LED lighting.
The utility model content
Therefore, the utility model proposes the driving power circuit that a kind of circuit structure is simple and constant pressure and flow is exported, be applicable to that the LED lighting uses.
The technical solution of the utility model is:
LED constant pressure and flow drive circuit of the present utility model comprises:
One bridge rectifier unit, the full-wave rectification bridge of forming by diode D1-D4;
One current-limiting resistance R4 is serially connected with above-mentioned bridge rectifier unit one input and exchanges an input AC2;
One filter unit is made of capacitor C 1 and resistance R 2, the R3 of parallel connection, is serially connected with another input of above-mentioned bridge rectifier unit and exchanges another input AC1;
One resistance R 1 is connected between interchange two input AC1, the AC2;
One filter capacitor C2 is connected in above-mentioned bridge rectifier unit output cathode and output negative pole, and wherein bridge rectifier unit output cathode is the anodal VCC+ of drive circuit;
Resistance R 5, the R6 unit of one series connection, an end is connected in above-mentioned drive circuit positive pole, and the other end is connected in the base stage b of an adjustable resistance RP1 one end and semiconductor triode Q1;
Semiconductor triode Q1, its base stage b are connected in the end points between a resistance R 5 and the adjustable resistance RP1, and its emitter e is connected in the other end of this adjustable resistance RP1, and its collector electrode c is drive circuit negative pole GND;
One resistance R, 7, one ends are connected in the emitter e of above-mentioned transistor Q1 and the end of adjustable resistance RP1, and the other end is connected in above-mentioned bridge rectifier unit output negative pole;
One adjustable resistance RP1, two ends are connected to base stage b and the emitter e of above-mentioned transistor Q1, and adjustable end is connected in above-mentioned bridge rectifier unit output negative pole.
Further, the described filter capacitor C2 electric capacity that is withstand voltage 400V.
Further, described transistor Q1 is 13003 switch triodes.
The utility model adopts as above technical scheme, has realized a kind of LED driving power circuit of constant pressure and flow.The utility model circuit is simple, and is with low cost, realized that the constant pressure and flow of LED lighting drives.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
LED constant pressure and flow drive circuit of the present utility model comprises:
One bridge rectifier unit, the full-wave rectification bridge of forming by diode D1-D4;
One current-limiting resistance R4 is serially connected with above-mentioned bridge rectifier unit one input and exchanges an input AC2;
One filter unit is made of capacitor C 1 and resistance R 2, the R3 of parallel connection, is serially connected with another input of above-mentioned bridge rectifier unit and exchanges another input AC1;
One resistance R 1 is connected between interchange two input AC1, the AC2;
One filter capacitor C2 is connected in above-mentioned bridge rectifier unit output cathode and output negative pole, and wherein bridge rectifier unit output cathode is the anodal VCC+ of drive circuit;
Resistance R 5, the R6 unit of one series connection, an end is connected in above-mentioned drive circuit positive pole, and the other end is connected in the base stage b of an adjustable resistance RP1 one end and semiconductor triode Q1;
Semiconductor triode Q1, its base stage b are connected in the end points between a resistance R 5 and the adjustable resistance RP1, and its emitter e is connected in the other end of this adjustable resistance RP1, and its collector electrode c is drive circuit negative pole GND;
One resistance R, 7, one ends are connected in the emitter e of above-mentioned transistor Q1 and the end of adjustable resistance RP1, and the other end is connected in above-mentioned bridge rectifier unit output negative pole;
One adjustable resistance RP1, two ends are connected to base stage b and the emitter e of above-mentioned transistor Q1, and adjustable end is connected in above-mentioned bridge rectifier unit output negative pole.
Preferably, the described filter capacitor C2 electric capacity that is withstand voltage 400V.
Preferably, described transistor Q1 is 13003 switch triodes.
The full-wave rectification bridge that the utility model is made up of diode D1-D4 carries out AC-DC conversion and the RC filter unit carries out filtering, carries out switch voltage-stabilizing by transistor Q1 again.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.
Claims (3)
1.LED the constant pressure and flow drive circuit is characterized in that: comprise
One bridge rectifier unit, the full-wave rectification bridge of forming by diode D1-D4;
One current-limiting resistance R4 is serially connected with above-mentioned bridge rectifier unit one input and exchanges an input AC2;
One filter unit is made of capacitor C 1 and resistance R 2, the R3 of parallel connection, is serially connected with above-mentioned bridge rectifier unit in addition
One input with exchange another input AC1;
One resistance R 1 is connected between interchange two input AC1, the AC2;
One filter capacitor C2 is connected in above-mentioned bridge rectifier unit output cathode and output negative pole, and wherein bridge rectifier unit output cathode is the anodal VCC+ of drive circuit;
Resistance R 5, the R6 unit of one series connection, an end is connected in above-mentioned drive circuit positive pole, and the other end is connected in the base stage b of an adjustable resistance RP1 one end and semiconductor triode Q1;
Semiconductor triode Q1, its base stage b are connected in the end points between a resistance R 5 and the adjustable resistance RP1, and its emitter e is connected in the other end of this adjustable resistance RP1, and its collector electrode c is drive circuit negative pole GND;
One resistance R, 7, one ends are connected in the emitter e of above-mentioned transistor Q1 and the end of adjustable resistance RP1, and the other end is connected in above-mentioned bridge rectifier unit output negative pole;
One adjustable resistance RP1, two ends are connected to base stage b and the emitter e of above-mentioned transistor Q1, and adjustable end is connected in above-mentioned bridge rectifier unit output negative pole.
2. LED constant pressure and flow drive circuit according to claim 1 is characterized in that: described filter capacitor C2 is the electric capacity of withstand voltage 400V.
3. LED constant pressure and flow drive circuit according to claim 1 is characterized in that: described transistor Q1 is 13003 switch triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205539580U CN201878375U (en) | 2010-10-08 | 2010-10-08 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205539580U CN201878375U (en) | 2010-10-08 | 2010-10-08 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
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| Publication Number | Publication Date |
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| CN201878375U true CN201878375U (en) | 2011-06-22 |
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| CN2010205539580U Expired - Fee Related CN201878375U (en) | 2010-10-08 | 2010-10-08 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573225A (en) * | 2011-12-23 | 2012-07-11 | 东莞市亿凌电子有限公司 | LED lamp and its power module |
| CN102612210A (en) * | 2012-02-06 | 2012-07-25 | 陈国富 | Novel LED (light emitting diode) illuminating component with constant-current, constant-voltage and protection functions |
| CN103619110A (en) * | 2013-12-10 | 2014-03-05 | 惠州市华阳光电技术有限公司 | Circuit and method for improving resistance capacitance voltage-reducing constant current accuracy |
| CN106550507A (en) * | 2016-11-03 | 2017-03-29 | 中山市荣亮照明有限公司 | LED lighting down lamp |
-
2010
- 2010-10-08 CN CN2010205539580U patent/CN201878375U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573225A (en) * | 2011-12-23 | 2012-07-11 | 东莞市亿凌电子有限公司 | LED lamp and its power module |
| CN102612210A (en) * | 2012-02-06 | 2012-07-25 | 陈国富 | Novel LED (light emitting diode) illuminating component with constant-current, constant-voltage and protection functions |
| CN103619110A (en) * | 2013-12-10 | 2014-03-05 | 惠州市华阳光电技术有限公司 | Circuit and method for improving resistance capacitance voltage-reducing constant current accuracy |
| CN103619110B (en) * | 2013-12-10 | 2016-04-06 | 惠州市华阳光电技术有限公司 | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy |
| CN106550507A (en) * | 2016-11-03 | 2017-03-29 | 中山市荣亮照明有限公司 | LED lighting down lamp |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20121008 |