CN103002643A - Constant-current drive circuit used for LED (Light Emitting Diode) lamp - Google Patents
Constant-current drive circuit used for LED (Light Emitting Diode) lamp Download PDFInfo
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- CN103002643A CN103002643A CN2012104932580A CN201210493258A CN103002643A CN 103002643 A CN103002643 A CN 103002643A CN 2012104932580 A CN2012104932580 A CN 2012104932580A CN 201210493258 A CN201210493258 A CN 201210493258A CN 103002643 A CN103002643 A CN 103002643A
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Abstract
The invention relates to a drive circuit used for an LED (Light Emitting Diode) lamp, in particular to a constant-current drive circuit used for the LED lamp. The constant-current drive circuit used for the LED lamp comprises a resistance-capacitance voltage reducing circuit (1) and a constant-current circuit (2), wherein capacitive reactance generated by a capacitor under alternating current signal frequency is utilized to limit the maximum working current of the loaded LED lamp so as to ensure that the LED lamp is incapable of being overloaded to cause damages possibly; and the constant-current circuit is connected between the resistance-capacitance voltage reducing circuit (1) and the loaded LED lamp so as to cause the current of the LED lamp to be constant and prevent the LED lamp from being damaged possibly by instability of external voltage. The constant-current drive circuit used for the LED lamp can efficiently solve the technical problem that the drive circuit is bad in stability; when the external voltage is instable, the LED lamp can be prevented from being burnt so that the service life of the LED lamp is greatly prolonged; moreover, the constant-current drive circuit is simple in structure, low in production cost, simple in working procedure and high in rate of finished products; and the drive circuit used for the LDE lamp is good in application prospect.
Description
Technical field
The present invention relates to a kind of drive circuit for the LED lamp, relate in particular to a kind of constant-current drive circuit for the LED lamp.
Background technology
On the market, general LED lamp drive circuit all is capacitance-resistance voltage reduction circuit, and the poor stability of sort circuit when external voltage is unstable, is easy to burn out the LED lamp, and reduced the useful life of LED lamp.Because above-mentioned shortcoming, people have researched and developed some novel LED lamp drive circuits, be that the Chinese patent application of 201019063019.X discloses a kind of LED lamp drive circuit such as application number, it comprises AC/DC converting circuit, comparator, the 21 triode, the 22 triode, the 23 triode, the 24 triode, the 21 resistance, the 22 resistance and diode, one end of comparator is connected with AC/DC converting circuit, the other end of comparator is connected with the base stage of the 21 triode, the collector electrode of the 21 triode is connected with an end of the 21 resistance, the other end of the 21 resistance is connected with the base stage of the 22 triode, be connected diode between the collector electrode of the 23 triode and the emitter of the 22 triode, the base stage of the 23 triode is connected with an end of the 22 resistance, and the other end of the 22 resistance is connected with the collector electrode of the 24 triode.This drive circuit has solved the unsettled problem of circuit to a certain extent really, but this circuit structure is complicated, needs a plurality of triodes, and cost is higher, is difficult to extensive use on the LED lamp.
Summary of the invention
The present invention is directed to LED lamp drive circuit complex structure of the prior art, need a plurality of triodes, cost is higher, is difficult on the LED lamp defectives such as extensive use, provides a kind of simple in structure, excellent performance, the constant-current drive circuit that is used for the LED lamp with low cost.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
A kind of constant-current drive circuit for the LED lamp, comprise capacitance-resistance voltage reduction circuit, the capacitive reactance that utilizes electric capacity to produce under the AC signal frequency limits the LED lamp maximum operating currenbt of load, to guarantee that the LED lamp can not burn out, also comprise constant-current circuit, be connected between the LED lamp of capacitance-resistance voltage reduction circuit and load, can make the current constant of LED lamp, avoid the LED lamp because external voltage burns out when unstable.Compared with prior art, between the LED of capacitance-resistance voltage reduction circuit and load lamp, access constant-current circuit, can effectively solve the technical problem of the poor stability of drive circuit, when external voltage is unstable, can avoid burning out the LED lamp, greatly increased the useful life of LED lamp, and simple in structure, cheap, do not need a plurality of triodes and comparator, production cost is low, operation is simple, rate of finished products is high, can be widely used in the middle of the drive circuit of LED lamp, even in the middle of other similar constant-current circuits.
As preferably, constant-current circuit is by a triode Q21 and three resistance R 21, R22, R23 consists of, resistance R 21 is connected an end and is connected with negative electrode with the anode of capacitance-resistance voltage reduction circuit output respectively with current sampling resistor R22, the other end of resistance R 21 is connected with the collector electrode of triode Q21, the other end of current sampling resistor R22 is connected with the base electrode of triode Q21 by resistance R 23, node between the negative electrode of capacitance-resistance voltage reduction circuit output and the current sampling resistor R22 is connected to the emitter of triode Q21, node between the anode of capacitance-resistance voltage reduction circuit output and the resistance R 21 is the anode of constant-current circuit output, and the node between resistance R 21 and the current sampling resistor R22 is the negative electrode of constant-current circuit output.This constant current circuit structure is simple, and successful can be fine solve in the LED lamp drive circuit because the inconstant technical problem of electric current that external voltage causes when unstable, and used components and parts is simply common, and cost is low.
As preferably, capacitance-resistance voltage reduction circuit is by a bridge rectifier diode VD11, VD12, VD13, VD14, a current limiting element VD15, a resistance R 11 and two capacitor C 11, C12 consists of, resistance R 11 and capacitor C 11 parallel connections, one end is connected to the anode of supply voltage, the other end is by bridge rectifier diode VD11, VD12, VD13, two relative node A of VD14, C and current limiting element VD15 are connected to the negative electrode of supply voltage, bridge rectifier diode VD11, VD12, VD13, the Node B that two other of VD14 is relative, D is connected respectively to the two ends of capacitor C 12, and the two ends of capacitor C 12 are respectively anode and the negative electrode of capacitance-resistance voltage reduction circuit output.Current limiting element VD15 is fuse or current-limiting resistance, C11 is decompression capacitor, R11 is the charge discharging resisting resistance of C11 behind the power cutoff, and the capacitive reactance that can utilize electric capacity to produce under the AC signal frequency limits the LED lamp maximum operating currenbt of load, can not burn out to guarantee the LED lamp.
The invention discloses a kind of constant-current drive circuit for the LED lamp, between the LED of capacitance-resistance voltage reduction circuit and load lamp, access constant-current circuit, can effectively solve the technical problem of the poor stability of drive circuit, when external voltage is unstable, can avoid burning out the LED lamp, greatly increased the useful life of LED lamp, and simple in structure, cheap, do not need a plurality of triodes and comparator, production cost is low, and operation is simple, rate of finished products is high, will have a good application prospect at the drive circuit that is used for the LED lamp.
Description of drawings
Fig. 1 is the structural representation of a kind of constant-current drive circuit for the LED lamp of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
Embodiment
A kind of constant-current drive circuit for the LED lamp, as shown in Figure 1: comprise capacitance-resistance voltage reduction circuit 1, the capacitive reactance that utilizes electric capacity to produce under the AC signal frequency limits the LED lamp maximum operating currenbt of load, to guarantee that the LED lamp can not burn out, also comprise constant-current circuit 2, be connected between the LED lamp of capacitance-resistance voltage reduction circuit 1 and load, can make the current constant of LED lamp, avoid the LED lamp because external voltage burns out when unstable.
Wherein, constant-current circuit 2 is by a triode Q21 and three resistance R 21, R22, R23 consists of, resistance R 21 is connected an end and is connected with negative electrode with the anode of capacitance-resistance voltage reduction circuit 1 output respectively with current sampling resistor R22, the other end of resistance R 21 is connected with the collector electrode of triode Q21, the other end of current sampling resistor R22 is connected with the base electrode of triode Q21 by resistance R 23, the negative electrode of capacitance-resistance voltage reduction circuit 1 output and the node between the current sampling resistor R22 are connected to the emitter of triode Q21, anode and the node between the resistance R 21 of capacitance-resistance voltage reduction circuit 1 output are the anode of constant-current circuit 2 outputs, and the node between resistance R 21 and the current sampling resistor R22 is the negative electrode of constant-current circuit 2 outputs.
Capacitance-resistance voltage reduction circuit 1 is by a bridge rectifier diode VD11, VD12, VD13, VD14, a current limiting element VD15, a resistance R 11 and two capacitor C 11, C12 consists of, resistance R 11 and capacitor C 11 parallel connections, one end is connected to the anode of supply voltage, the other end is by bridge rectifier diode VD11, VD12, VD13, two relative node A of VD14, C and current limiting element VD15 are connected to the negative electrode of supply voltage, current limiting element VD15 is fuse or current-limiting resistance, select fuse in the present embodiment, bridge rectifier diode VD11, VD12, VD13, the Node B that two other of VD14 is relative, D is connected respectively to the two ends of capacitor C 12, and the two ends of capacitor C 12 are respectively anode and the negative electrode of capacitance-resistance voltage reduction circuit 1 output.
In a word, the above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (3)
1. constant-current drive circuit that is used for the LED lamp, comprise capacitance-resistance voltage reduction circuit (1), the capacitive reactance that utilizes electric capacity to produce under the AC signal frequency limits the LED lamp maximum operating currenbt of load, to guarantee that the LED lamp can not burn out, it is characterized in that: also comprise constant-current circuit (2), be connected between the LED lamp of capacitance-resistance voltage reduction circuit (1) and load, can make the current constant of LED lamp, avoid the LED lamp because external voltage burns out when unstable.
2. a kind of constant-current drive circuit for the LED lamp according to claim 1, it is characterized in that: constant-current circuit (2) is by a triode (Q21) and three resistance (R21, R22, R23) consist of, resistance (R21) is connected R22 with current sampling resistor) an end be connected with negative electrode with the anode of capacitance-resistance voltage reduction circuit (1) output respectively, the other end of resistance (R21) is connected with the collector electrode of triode (Q21), the other end of current sampling resistor (R22) is connected with the base electrode of triode (Q21) by resistance (R23), the negative electrode of capacitance-resistance voltage reduction circuit (1) output and the node between the current sampling resistor (R22) are connected to the emitter of triode (Q21), anode and the node between the resistance (R21) of capacitance-resistance voltage reduction circuit (1) output are the anode of constant-current circuit (2) output, and the node between resistance (R21) and the current sampling resistor (R22) is the negative electrode of constant-current circuit (2) output.
3. a kind of constant-current drive circuit for the LED lamp according to claim 1, it is characterized in that: capacitance-resistance voltage reduction circuit (1) is by a bridge rectifier diode (VD11, VD12, VD13, VD14), a current limiting element (VD15), a resistance (R11) and two electric capacity (C11, C12) consist of, resistance (R11) and electric capacity (C11) parallel connection, one end is connected to the anode of supply voltage, the other end is by bridge rectifier diode (VD11, VD12, VD13, VD14) two relative node (A, C) and current limiting element (VD15) be connected to the negative electrode of supply voltage, bridge rectifier diode (VD11, VD12, VD13, VD14) node (B that two other is relative, D) be connected respectively to the two ends of electric capacity (C12), the two ends of electric capacity (C12) are respectively anode and the negative electrode of capacitance-resistance voltage reduction circuit (1) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104932580A CN103002643A (en) | 2012-11-27 | 2012-11-27 | Constant-current drive circuit used for LED (Light Emitting Diode) lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104932580A CN103002643A (en) | 2012-11-27 | 2012-11-27 | Constant-current drive circuit used for LED (Light Emitting Diode) lamp |
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| CN103002643A true CN103002643A (en) | 2013-03-27 |
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| CN2012104932580A Pending CN103002643A (en) | 2012-11-27 | 2012-11-27 | Constant-current drive circuit used for LED (Light Emitting Diode) lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107170260A (en) * | 2017-06-14 | 2017-09-15 | 成都雷纳斯科技有限公司 | A kind of novel traffic signal lamp |
| CN107180547A (en) * | 2017-06-14 | 2017-09-19 | 成都雷纳斯科技有限公司 | A kind of durable type traffic lights |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
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| CN101001017A (en) * | 2006-01-13 | 2007-07-18 | 汤征宁 | Anti-surge capacity voltage dropping circuit |
| CN201374838Y (en) * | 2009-03-11 | 2009-12-30 | 四川九洲铭伟半导体照明有限公司 | LED driving power source |
| CN201499346U (en) * | 2009-07-21 | 2010-06-02 | 福建大晶光电有限公司 | Lower-power LED stabilized current driving circuit |
| CN202435681U (en) * | 2012-01-09 | 2012-09-12 | 杭州鸿德照明科技有限公司 | Wide voltage input linear constant current LED (Light-Emitting Diode) driving circuit |
| CN202841601U (en) * | 2012-07-31 | 2013-03-27 | 李栋林 | Constant-current power supply circuit |
-
2012
- 2012-11-27 CN CN2012104932580A patent/CN103002643A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001017A (en) * | 2006-01-13 | 2007-07-18 | 汤征宁 | Anti-surge capacity voltage dropping circuit |
| CN201374838Y (en) * | 2009-03-11 | 2009-12-30 | 四川九洲铭伟半导体照明有限公司 | LED driving power source |
| CN201499346U (en) * | 2009-07-21 | 2010-06-02 | 福建大晶光电有限公司 | Lower-power LED stabilized current driving circuit |
| CN202435681U (en) * | 2012-01-09 | 2012-09-12 | 杭州鸿德照明科技有限公司 | Wide voltage input linear constant current LED (Light-Emitting Diode) driving circuit |
| CN202841601U (en) * | 2012-07-31 | 2013-03-27 | 李栋林 | Constant-current power supply circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107170260A (en) * | 2017-06-14 | 2017-09-15 | 成都雷纳斯科技有限公司 | A kind of novel traffic signal lamp |
| CN107180547A (en) * | 2017-06-14 | 2017-09-19 | 成都雷纳斯科技有限公司 | A kind of durable type traffic lights |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
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Application publication date: 20130327 |