CN203086799U - LED driving circuit under double-loop control - Google Patents
LED driving circuit under double-loop control Download PDFInfo
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- CN203086799U CN203086799U CN 201220732403 CN201220732403U CN203086799U CN 203086799 U CN203086799 U CN 203086799U CN 201220732403 CN201220732403 CN 201220732403 CN 201220732403 U CN201220732403 U CN 201220732403U CN 203086799 U CN203086799 U CN 203086799U
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Abstract
The utility model discloses an LED driving circuit under double-loop control. The LED driving circuit 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 which are connected in sequence. The load circuit includes a plurality of LED light sources connected in series or in parallel, a power triode Q1, a sampling resistor Rs and a bias resistor Rb; the output current sampling control loop includes a control triode Q2 and a sampling resistor Rs; and the input voltage sampling control loop includes a control triode Q3 and sampling resistors R1 and R2. Due to the adoption of the LED driving circuit under double-loop control, the power consumption of the power tube is enabled to decrease with the increase of the input voltage, the power efficiency is improved, the heat radiation is reduced, and the safety performance of lamps is increased.
Description
Technical field
The utility model 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, advantages such as volume is little begin to be used, and current regulator diode makes output current constant in certain voltage range, when input voltage produces fluctuation, can the proof load electric current constant substantially, therefore be suitable as LED and drive.Because current regulator diode connects with load, the LED load voltage is constant substantially, 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 big more, and the current regulator diode power consumption is big more, temperature sharply rises, if it is bad to dispel the heat, then jeopardizes the stable and safety of circuit.
In addition, household LED illumination at present 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, the cost height, and the LED that is not suitable for the little electric current of high voltage drives; Linear power supply has simple in structure, advantages such as Electro Magnetic Compatibility is good, it is the preferred option of the little current drives of high voltage, but because the adjustment pipe of linear power supply is connected with LED, the power consumption of adjusting pipe is big, produce a large amount of heat, reduced the efficient of power supply, strengthened the heat dissipation design difficulty of light fixture simultaneously.
The utility model content
The technical problems to be solved in the utility model provides the led drive circuit of a kind of power-efficient height, heat dispersion excellence.
For solving the problems of the technologies described above, the technical solution adopted in the utility model 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 connects resistance R s, 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 base stage is connected resistance R 1 and R2 respectively with the output positive and negative electrode of rectification circuit.
Further, described rectification circuit is a full bridge rectifier.
The utility model 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 embodiment of the present utility model is described further.
Fig. 1 is the circuit diagram of the utility model led drive circuit;
Output current wave figure when Fig. 2 is the utility model led drive circuit input voltage 220V;
Output current wave figure when Fig. 3 is the utility model led drive circuit input voltage 230V;
Output current wave figure when Fig. 4 is the utility model led drive circuit input voltage 240V;
Output current wave figure when Fig. 5 is the utility model led drive circuit input voltage 250V;
Output current wave figure when Fig. 6 is the utility model led drive circuit input voltage 265V.
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 connects resistance R s, 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 utility model is not limited only to full bridge rectifier, other rectification circuits 2 commonly used all belong to conventional design, as half-bridge rectification 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 base stage is connected resistance R 1 and R2 respectively with the output positive and negative electrode of rectification circuit 2.
The led drive circuit course of work of the utility model dicyclo control 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 ends, cut off the LED current path, so LED is with the pulsating current driven for emitting lights.
2), described output current controlling of sampling loop 4 is made up 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 made up of input voltage dividing potential drop sampling resistor R1 and R2, control triode Q3, when input voltage just often, the base voltage of Q3 is in and makes under the required voltage levvl of its conducting, Q3 ends; 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.
As Fig. 2-shown in Figure 6, be respectively the input voltage 220V of led drive circuit, 230V, 240V, the output current wave of correspondence 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 utility model 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, the reliability height, and cost is low, no electric capacity, long service life.
The above only is a preferential execution mode of the present utility model, and the utility model is not limited to above-mentioned execution mode, as long as realize that with basic identical means the technical scheme of the utility model purpose all belongs within the protection range of the present utility model.
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 connects resistance R s, is connected biasing resistor Rb between the output cathode of base stage and rectification circuit (2); It is characterized in that also 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 base stage is connected resistance R 1 and R2 respectively with the output positive and negative electrode of rectification circuit (2).
2. the led drive circuit of a kind of dicyclo control according to claim 1 is characterized in that described rectification circuit (2) is a full bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220732403 CN203086799U (en) | 2012-12-27 | 2012-12-27 | LED driving circuit under double-loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220732403 CN203086799U (en) | 2012-12-27 | 2012-12-27 | LED driving circuit under double-loop control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086799U true CN203086799U (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220732403 Expired - Fee Related CN203086799U (en) | 2012-12-27 | 2012-12-27 | LED driving circuit under double-loop control |
Country Status (1)
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| CN (1) | CN203086799U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079311A (en) * | 2012-12-27 | 2013-05-01 | 木林森股份有限公司 | Double loop controlled LED (Light Emitting Diode) driving circuit |
| CN103476185B (en) * | 2013-09-27 | 2015-10-28 | 惠州市华阳多媒体电子有限公司 | A kind of drive circuit of light-emitting diode |
| 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 |
| CN108170196A (en) * | 2016-12-08 | 2018-06-15 | 西门子公司 | For the circuit arrangement and peripheral assembly of the digital input end of peripheral assembly |
-
2012
- 2012-12-27 CN CN 201220732403 patent/CN203086799U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079311A (en) * | 2012-12-27 | 2013-05-01 | 木林森股份有限公司 | Double loop controlled LED (Light Emitting Diode) driving circuit |
| CN103476185B (en) * | 2013-09-27 | 2015-10-28 | 惠州市华阳多媒体电子有限公司 | A kind of drive circuit of light-emitting diode |
| CN108170196A (en) * | 2016-12-08 | 2018-06-15 | 西门子公司 | For the circuit arrangement and peripheral assembly of the digital input end of peripheral assembly |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20181227 |