CN103079311A - Double loop controlled LED (Light Emitting Diode) driving circuit - Google Patents
Double loop controlled LED (Light Emitting Diode) driving circuit Download PDFInfo
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- CN103079311A CN103079311A CN2012105777188A CN201210577718A CN103079311A CN 103079311 A CN103079311 A CN 103079311A CN 2012105777188 A CN2012105777188 A CN 2012105777188A CN 201210577718 A CN201210577718 A CN 201210577718A CN 103079311 A CN103079311 A CN 103079311A
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Abstract
The invention discloses a double loop controlled LED (Light Emitting Diode) driving circuit, which comprises an alternating current power supply, a rectifying circuit, a load circuit, an output current sampling control loop and an input voltage sampling control loop connected in sequence, wherein the load circuit comprises a plurality of serial or parallel LED light sources, a power triode Q1, a sampling resistor Rs and a bias resistor Rb; the output current sampling control loop comprises a control triode Q2 and a sampling resistor Rs; and the input voltage sampling control loop comprises a control triode Q3 and sampling resistors R1 and R2. By using the double loop controlled LED driving circuit, power consumption of a power tube is reduced along with rise of input voltage, so that the power efficiency is increased, the heating is reduced, and the safety performance of a lamp is enhanced.
Description
Technical field
The present invention relates to a kind of led drive circuit, especially a kind of led drive circuit of dicyclo control.
Background technology
At present, many LED light fixtures adopt the drive scheme of high voltage low current.Wherein to have a circuit simple for the drive scheme of current regulator diode series LED, the advantages such as volume is little begin to be used, and current regulator diode makes constant output current in certain voltage range, when input voltage produces fluctuation, can the proof load electric current substantially constant, therefore be suitable as LED and drive.Because current regulator diode connects with load, the LED load voltage is substantially constant, when input voltage and load voltage do not wait, its pressure reduction will all be added on the current regulator diode, and pressure reduction is larger, and the current regulator diode power consumption is larger, temperature sharply rises, if it is bad to dispel the heat, then jeopardizes the stable and safety of circuit.
In addition, at present household LED illumination drives and trends towards low-cost miniaturization, traditional resistance-capacitance depressurization is propagated its belief on a large scale, but its intrinsic defective (non-isolation, non-constant current, overvoltage are impacted) limited the application in the LED illumination, the Switching Power Supply complex structure, cost is high, and is not suitable for the LED driving of the little electric current of high voltage; Linear power supply has simple in structure, the advantages such as Electro Magnetic Compatibility is good, it is the preferred option of high voltage small current driving, but because the adjustment pipe of linear power supply is connected with LED, the power consumption of adjusting pipe is large, produce a large amount of heat, reduced the efficient of power supply, strengthened simultaneously the heat dissipation design difficulty of light fixture.
Summary of the invention
The technical problem to be solved in the present invention provides the led drive circuit that a kind of power-efficient is high, heat radiation is low.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of led drive circuit of dicyclo control comprises the AC power, rectification circuit, the load circuit that connect successively; Described load circuit comprises led light source, pliotron Q1, sampling resistor Rs and the biasing resistor Rb of some serial or parallel connections; Described pliotron Q1 collector electrode is connected with the negative pole of led light source, and emitter contact resistance Rs is connected biasing resistor Rb between the output cathode of base stage and rectification circuit; This led drive circuit also comprises:
One output current controlling of sampling loop comprises control triode Q2 and sampling resistor Rs; The base stage of described control triode Q2 links to each other with the emitter of pliotron Q1, and collector electrode is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit;
One input voltage controlling of sampling loop comprises control triode Q3, sampling resistor R1 and R2; The collector electrode of described control triode Q3 is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit, and the output positive and negative electrode of base stage and rectification circuit is contact resistance R1 and R2 respectively.
Further, described rectification circuit is full bridge rectifier.
The present invention utilizes the led drive circuit of dicyclo control, and the power consumption of power tube is reduced along with the rising of input voltage, has improved power-efficient, has reduced heating, has increased the security performance of light fixture.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
Fig. 1 is the circuit diagram of led drive circuit of the present invention;
Output current wave figure when Fig. 2 is led drive circuit input voltage 220V of the present invention;
Output current wave figure when Fig. 3 is led drive circuit input voltage 230V of the present invention;
Output current wave figure when Fig. 4 is led drive circuit input voltage 240V of the present invention;
Output current wave figure when Fig. 5 is led drive circuit input voltage 250V of the present invention;
Output current wave figure when Fig. 6 is led drive circuit input voltage 265V of the present invention.
Embodiment
As shown in Figure 1, be a kind of led drive circuit of dicyclo control, comprise the AC power 1, rectification circuit 2, the load circuit 3 that connect successively, and output current controlling of sampling loop 4, input voltage controlling of sampling loop 5; Wherein, load circuit 3 comprises led light source, pliotron Q1, sampling resistor Rs and the biasing resistor Rb of some series connection; Pliotron Q1 collector electrode is connected with the negative pole of led light source, and emitter contact resistance Rs is connected biasing resistor Rb between the output cathode of base stage and rectification circuit 2.
It is pointed out that rectification circuit 2 of the present invention is not limited only to full bridge rectifier, other rectification circuits 2 commonly used all belong to conventional design, such as Half bridge rectifier circuit, voltage doubling rectifing circuit.In addition, AC power 1 is actually the external communication electrical network.
As shown in Figure 1, output current controlling of sampling loop 4 comprises control triode Q2 and sampling resistor Rs; The base stage of described control triode Q2 links to each other with the emitter of pliotron Q1, and collector electrode is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit 2.
As shown in Figure 1, input voltage controlling of sampling loop 5 comprises control triode Q3, sampling resistor R1 and R2; The collector electrode of described control triode Q3 is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit 2, and the output positive and negative electrode of base stage and rectification circuit 2 is contact resistance R1 and R2 respectively.
The led drive circuit course of work of dicyclo control of the present invention is:
1), AC power 1 input sinusoidal ac, after full bridge rectifier 2 rectifications, become the Rectified alternating current of half cycle, when the voltage of Rectified alternating current rises to the cut-in voltage of LED, pliotron Q1 conducting, for LED provides current path, when voltage falls back to the cut-in voltage of LED when following, pliotron Q1 cut-off, cut off the LED current path, so LED drives with pulsating current luminous.
2), described output current controlling of sampling loop 4 is comprised of output current sampling resistor Rs and control triode Q2, sampling resistor is connected among the load circuit 3.When the output current in the loop rises along with the rising of input voltage, pressure drop on the sampling resistor Rs is also risen thereupon, pressure drop on sampling resistor Rs will reach the required voltage of triode Q2 conducting, triode Q2 begins conducting, the pliotron Q1 base current of major loop is reduced by the shunting of Current Control triode Q2 collector electrode, thereby the collector current of pliotron Q1 is reduced, and main circuit current is limited at set point.
3), input voltage controlling of sampling loop 5 is comprised of input voltage dividing potential drop sampling resistor R1 and R2, control triode Q3, when input voltage was normal, the base voltage of Q3 was in and makes under the required voltage levvl of its conducting, the Q3 cut-off; When input voltage was higher than normal voltage, the Q3 base voltage was increased to and makes the Q3 conducting, and the Q1 base current is further shunted by the Q3 collector electrode, and output current reduces, and the Q1 power consumption reduces.
Such as Fig. 2-shown in Figure 6, be respectively the input voltage 220V of led drive circuit, 230V, 240V, corresponding output current wave when 250V and 265V.As seen from the figure, when input voltage was rated voltage 220V, current constant during the LED conducting showed that current controlled circuit 4 has played effective control action; Along with the rising of voltage, sinking appears in the electric current during the LED conducting, shows that input voltage controlling of sampling loop 5 works, and the power consumption of pliotron Q1 is defined within the specific limits.
The present invention utilizes the led drive circuit of dicyclo control, and the power consumption of power tube is reduced along with the rising of input voltage, has improved power-efficient, has reduced heating, has increased the security performance of light fixture.And its circuit is simple, and reliability is high, and cost is low, without electric capacity, and long service life.
The above only is preferential execution mode of the present invention, and the present invention is not limited to above-mentioned execution mode, as long as realize that with basic identical means the technical scheme of the object of the invention all belongs within protection scope of the present invention.
Claims (2)
1. the led drive circuit of a dicyclo control comprises the AC power (1), rectification circuit (2), the load circuit (3) that connect successively; Described load circuit (3) comprises led light source, pliotron Q1, sampling resistor Rs and the biasing resistor Rb of some serial or parallel connections; Described pliotron Q1 collector electrode is connected with the negative pole of led light source, and emitter contact resistance Rs is connected biasing resistor Rb between the output cathode of base stage and rectification circuit (2); Characterized by further comprising:
One output current controlling of sampling loop (4) comprises control triode Q2 and sampling resistor Rs; The base stage of described control triode Q2 links to each other with the emitter of pliotron Q1, and collector electrode is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit (2);
One input voltage controlling of sampling loop (5) comprises control triode Q3, sampling resistor R1 and R2; The collector electrode of described control triode Q3 is connected with the base stage of pliotron Q1, and emitter is connected with the output negative pole of rectification circuit (2), and the output positive and negative electrode of base stage and rectification circuit (2) is contact resistance R1 and R2 respectively.
2. the led drive circuit of a kind of dicyclo control according to claim 1 is characterized in that described rectification circuit (2) is full bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105777188A CN103079311A (en) | 2012-12-27 | 2012-12-27 | Double loop controlled LED (Light Emitting Diode) driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105777188A CN103079311A (en) | 2012-12-27 | 2012-12-27 | Double loop controlled LED (Light Emitting Diode) driving circuit |
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| CN103079311A true CN103079311A (en) | 2013-05-01 |
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| CN2012105777188A Pending CN103079311A (en) | 2012-12-27 | 2012-12-27 | Double loop controlled LED (Light Emitting Diode) driving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455245A (en) * | 2015-08-10 | 2017-02-22 | 法雷奥电机设备公司 | Protective circuit used for drive circuit |
| CN109348579A (en) * | 2018-10-29 | 2019-02-15 | 宁波耀泰电器有限公司 | A kind of LED constant current circuit |
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| CN201018696Y (en) * | 2007-03-16 | 2008-02-06 | 林万炯 | Control circuit of LED drive power supply |
| CN201550315U (en) * | 2009-11-26 | 2010-08-11 | 付会芬 | LED driving circuit |
| CN102469655A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN202374531U (en) * | 2011-12-21 | 2012-08-08 | 韦挽澜 | White light-emitting diode (LED) drive circuit without electrolytic capacitor |
| CN202385341U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED power supply constant-current device |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
| CN203086799U (en) * | 2012-12-27 | 2013-07-24 | 木林森股份有限公司 | LED driving circuit under double-loop control |
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2012
- 2012-12-27 CN CN2012105777188A patent/CN103079311A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201018696Y (en) * | 2007-03-16 | 2008-02-06 | 林万炯 | Control circuit of LED drive power supply |
| CN201550315U (en) * | 2009-11-26 | 2010-08-11 | 付会芬 | LED driving circuit |
| CN102469655A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN202385341U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED power supply constant-current device |
| CN202374531U (en) * | 2011-12-21 | 2012-08-08 | 韦挽澜 | White light-emitting diode (LED) drive circuit without electrolytic capacitor |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
| CN203086799U (en) * | 2012-12-27 | 2013-07-24 | 木林森股份有限公司 | LED driving circuit under double-loop control |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455245A (en) * | 2015-08-10 | 2017-02-22 | 法雷奥电机设备公司 | Protective circuit used for drive circuit |
| CN106455245B (en) * | 2015-08-10 | 2020-05-12 | 法雷奥电机设备公司 | Protection circuit for driving circuit |
| CN109348579A (en) * | 2018-10-29 | 2019-02-15 | 宁波耀泰电器有限公司 | A kind of LED constant current circuit |
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Application publication date: 20130501 |