CN205142616U - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
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- CN205142616U CN205142616U CN201520903350.9U CN201520903350U CN205142616U CN 205142616 U CN205142616 U CN 205142616U CN 201520903350 U CN201520903350 U CN 201520903350U CN 205142616 U CN205142616 U CN 205142616U
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- circuit
- constant current
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Abstract
The utility model provides a LED constant current driving circuit, includes rectification filter circuit, voltage stabilizing circuit, constant current amplifier circuit, constant current LED current circuit and feedback circuit, the outside communication electricity loops through rectification filter circuit, voltage stabilizing circuit, constant current amplifier circuit drive constant current LED current circuit, and constant current amplifier circuit's current signal passes through the output that feedback circuit feeds back voltage stabilizing circuit control constant current amplifier circuit. The utility model discloses utilize the IC who replaces the specialty including rectification filter circuit, voltage stabilizing circuit, constant current amplifier circuit, constant current LED current circuit and feedback circuit's simple circuit, effective reduce cost to efficiency can reach the percent more than 85, the design of circuit is simpler than switching power supply, and is durable, and not to the communication, broadcast equipment produces the interference, output current through feedback resistance R2 control constant current amplifier circuit guarantees constant current drive LED. (U /)
Description
Technical field
The utility model is applicable to LED illumination and electronic circuit design field, specifically a kind of simple constant current driver circuit for LED efficiently exchanging input.
Background technology
LED is called as forth generation lighting source or green light source, has the features such as energy-saving and environmental protection, the life-span is long, volume is little, can be widely used in the fields such as various instruction, display, decoration, backlight, general lighting and urban landscape.Due to the semiconductor device that LED is characteristic sensitivity, again there is negative temperature characteristic, thus need to carry out steady-working state and protection to it in application process, thus create the concept of driving.LED component is to the requirement of driving power near harshness, and LED, unlike common incandescent lamp bulb, directly can connect the electric main of 220V.LED is the low voltage drive of 2 ~ 3 volts, and must design complicated translation circuit, the LED of different purposes, be equipped with different power supply adaptors.On international market, foreign customers is changed the efficiency of LED drive power, the requirement of effective power, constant current accuracy, power source life, electromagnetic compatibility is all very high, design a good power supply and must consider these factors, because the effect of power supply in whole light fixture is like important as human heart.Light characteristic due to LED is all described as the function of electric current usually, instead of the function of voltage, and luminous flux (φ V) and the relation curve of IF, therefore, adopt constant-current source to drive and can control brightness better.The constant current of LED drives the drive IC of large fecund specialty on the market at present, which increases driving cost.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of constant current driver circuit for LED, the problem that the IC overcoming tradition needs specialty drives, and reduce cost, and efficiency can reach more than 85 percent.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of constant current driver circuit for LED, comprises current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit, constant-current LED series circuit and feedback circuit; External communication electricity drives constant-current LED series circuit by current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit successively, and the current signal of constant current amplifying circuit feeds back to by feedback circuit the output that voltage stabilizing circuit controls constant current amplifying circuit.
As improvement, described current rectifying and wave filtering circuit comprises rectifier bridge and filter capacitor C1, and the output of rectifier bridge is in parallel with filter capacitor C1, and described rectifier bridge is connected and composed by four diode D1 ~ D4 head and the tail.Alternating current becomes direct current by the rectification of circuit bridge, then spike electricity is removed in electric capacity C1 filtering after filtering, obtains metastable direct current.
As improvement, described voltage stabilizing circuit comprises the resistance R1, diode D5 and the diode D6 that are sequentially connected in series, and described voltage stabilizing circuit is in parallel with the output of current rectifying and wave filtering circuit.When enough large voltage, the forward voltage drop due to diode is a stationary value, so the triode Q1 base stage be connected with diode obtains fixed voltage.
As improvement, described constant current amplifying circuit comprises NPN triode Q1, PNP triode Q2 and feedback resistance R2, the base stage of described triode Q1 is connected between resistance R1 and diode D5, the emitter of triode Q1 is connected with the negative electrode of diode D6 by feedback resistance R2, the collector electrode of triode Q1 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with constant-current LED series circuit, and the collector electrode of triode Q2 is connected with the emitter of triode Q1.Feedback resistance R2 is simultaneously as feedback circuit, and feedback resistance R2 does current detecting, and when the electric current flowing through feedback resistance R2 increases, the feedback resistance R2 voltage rise that powers on is high, and the electric current of triode Q1 can increase, and the electric current of triode Q2 can reduce; When the electric current flowing through feedback resistance R2 reduces, on feedback resistance R2, voltage drop is low, and the electric current of triode Q1 can reduce, and the electric current of triode Q2 can increase, thus ensures the constant current of constant-current LED series circuit.
As improvement, described constant-current LED series circuit is made up of the LED of some mutual series connection, and the positive pole of constant-current LED series circuit is connected with the output head anode of current rectifying and wave filtering circuit, and the negative pole of constant-current LED series circuit is connected with the emitter of triode Q2.
As improvement, described triode Q1 is 2N5551, and triode Q2 is TIP32A.
As improvement, the emitter of described triode Q1 is connected with the base stage of triode Q2 by resistance R3.The design protection triode Q1 of resistance R3 is not breakdown.
The beneficial effect that the utility model is compared with prior art brought is:
The utility model utilizes the ball bearing made using comprising current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit, constant-current LED series circuit and feedback circuit to replace the IC of specialty, effectively reduce costs, and efficiency can reach more than 85 percent; The design of circuit is simpler than Switching Power Supply, durable, and not to communication, broadcasting equipment produces interference; Controlled the output current of constant current amplifying circuit by feedback resistance R2, ensure constant-current driving LED.
Accompanying drawing explanation
Fig. 1 is the utility model block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.
As shown in Figure 1, a kind of constant current driver circuit for LED, comprises current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit, constant-current LED series circuit and feedback circuit; External communication electricity drives constant-current LED series circuit by current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit successively, and the current signal of constant current amplifying circuit feeds back to by feedback circuit the output that voltage stabilizing circuit controls constant current amplifying circuit.
As shown in Figure 2, described current rectifying and wave filtering circuit comprises rectifier bridge and filter capacitor C1, and the output of rectifier bridge is in parallel with filter capacitor C1, and described rectifier bridge is connected and composed by four diode D1 ~ D4 head and the tail.Alternating current becomes direct current by the rectification of circuit bridge, then spike electricity is removed in electric capacity C1 filtering after filtering, obtains metastable direct current.
Described voltage stabilizing circuit comprises the resistance R1, diode D5 and the diode D6 that are sequentially connected in series, one end of resistance R1 is connected with the output head anode of current rectifying and wave filtering circuit, the anode of the other end diode D5 of resistance R1 connects, the negative electrode of diode D5 is connected with the anode of diode D6, and the negative electrode of diode D6 is connected with the negative pole of output end of current rectifying and wave filtering circuit.When enough large voltage, the forward voltage drop due to diode is a stationary value, so the triode Q1 base stage be connected with diode obtains fixed voltage.
Described constant current amplifying circuit comprises NPN triode Q1, PNP triode Q2 and feedback resistance R2.The optional 2N5551 of described triode Q1, the optional TIP32A of triode Q2.The base stage of described triode Q1 is connected between resistance R1 and diode D5; the emitter of triode Q1 is connected with the negative electrode of diode D6 by feedback resistance R2; the collector electrode of triode Q1 is connected with the base stage of triode Q2 by resistance R3, and triode Q1 can be protected not breakdown.The emitter of described triode Q2 is connected with constant-current LED series circuit, and the collector electrode of triode Q2 is connected with the emitter of triode Q1.Feedback resistance R2 is simultaneously as feedback circuit, and feedback resistance R2 does current detecting, and when the electric current flowing through feedback resistance R2 increases, the feedback resistance R2 voltage rise that powers on is high, and the electric current of triode Q1 can increase, and the electric current of triode Q2 can reduce; When the electric current flowing through feedback resistance R2 reduces, on feedback resistance R2, voltage drop is low, and the electric current of triode Q1 can reduce, and the electric current of triode Q2 can increase, thus ensures the constant current of constant-current LED series circuit.
Described constant-current LED series circuit is made up of the LED of some mutual series connection, and the positive pole of constant-current LED series circuit is connected with the output head anode of current rectifying and wave filtering circuit, and the negative pole of constant-current LED series circuit is connected with the emitter of triode Q2.
When line voltage is rated value, the pressure drop on constant-current source is about 50V, and now, the efficiency of drive circuit is more than 85%, higher than the typical efficiencies of Switching Power Supply.The utility model circuit design is simpler than Switching Power Supply, durable, and cost is low and not to communication, broadcasting equipment produces interference.
Claims (8)
1. a constant current driver circuit for LED, is characterized in that: comprise current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit, constant-current LED series circuit and feedback circuit; External communication electricity drives constant-current LED series circuit by current rectifying and wave filtering circuit, voltage stabilizing circuit, constant current amplifying circuit successively, and the current signal of constant current amplifying circuit feeds back to by feedback circuit the output that voltage stabilizing circuit controls constant current amplifying circuit.
2. a kind of constant current driver circuit for LED according to claim 1, it is characterized in that: described current rectifying and wave filtering circuit comprises rectifier bridge and filter capacitor C1, the output of rectifier bridge is in parallel with filter capacitor C1, and described rectifier bridge is connected and composed by four diode D1 ~ D4 head and the tail.
3. a kind of constant current driver circuit for LED according to claim 2, is characterized in that: described voltage stabilizing circuit comprises the resistance R1, diode D5 and the diode D6 that are sequentially connected in series, and described voltage stabilizing circuit is in parallel with the output of current rectifying and wave filtering circuit.
4. a kind of constant current driver circuit for LED according to claim 3, it is characterized in that: described constant current amplifying circuit comprises NPN triode Q1, PNP triode Q2 and feedback resistance R2, the base stage of described triode Q1 is connected between resistance R1 and diode D5, the emitter of triode Q1 is connected with the negative electrode of diode D6 by feedback resistance R2, the collector electrode of triode Q1 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with constant-current LED series circuit, and the collector electrode of triode Q2 is connected with the emitter of triode Q1.
5. a kind of constant current driver circuit for LED according to claim 4, is characterized in that: described feedback circuit comprises feedback resistance R2.
6. a kind of constant current driver circuit for LED according to claim 5, it is characterized in that: described constant-current LED series circuit is made up of the LED of some mutual series connection, the positive pole of constant-current LED series circuit is connected with the output head anode of current rectifying and wave filtering circuit, and the negative pole of constant-current LED series circuit is connected with the emitter of triode Q2.
7. a kind of constant current driver circuit for LED according to claim 4, is characterized in that: described triode Q1 is 2N5551, and triode Q2 is TIP32A.
8. a kind of constant current driver circuit for LED according to claim 4, is characterized in that: the emitter of described triode Q1 is connected with the base stage of triode Q2 by resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903350.9U CN205142616U (en) | 2015-11-13 | 2015-11-13 | LED constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903350.9U CN205142616U (en) | 2015-11-13 | 2015-11-13 | LED constant current driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205142616U true CN205142616U (en) | 2016-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520903350.9U Expired - Fee Related CN205142616U (en) | 2015-11-13 | 2015-11-13 | LED constant current driving circuit |
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| CN (1) | CN205142616U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
-
2015
- 2015-11-13 CN CN201520903350.9U patent/CN205142616U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
| CN116471723B (en) * | 2023-05-25 | 2023-09-15 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Guangzhou City, Guangdong province 510800 city car Fengshen Avenue South of Huadu District Patentee after: Rayton Intelligent Photoelectric Co., Ltd. Patentee after: Guangdong University of Technology Address before: 510800 Guangdong Province, Guangzhou Huadu District Fengshen Avenue Ling Xi Lu leiteng Industrial Park Patentee before: Guangzhou Rayton Lighting Science & Technology Co., Ltd. Patentee before: Guangdong University of Technology |
|
| 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: 20160406 Termination date: 20181113 |