CN204465966U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN204465966U CN204465966U CN201520110215.9U CN201520110215U CN204465966U CN 204465966 U CN204465966 U CN 204465966U CN 201520110215 U CN201520110215 U CN 201520110215U CN 204465966 U CN204465966 U CN 204465966U
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Abstract
The utility model discloses a kind of LED drive circuit, comprise inductance L 1, inductance L 2, resistance R1, electric capacity C1, LED group and triode VT1.The utility model circuit is with all-wave current-limit mode, from AC power Direct driver white LED lamp group, thus realize a kind of flicker free, the solid-state lighting lamp of high energy efficiency, circuit can at driving voltage just, negative bias moves period, adopt alternately electric switch working method, LED exciting current in the negative half period of driving voltage and positive half cycle is controlled and maintains a constant level, this processing mode can do the rectification of Current Control to alternating voltage, make it the direct current supply voltage becoming series LED lamp group, there is the electric current of clean almost ripple-free, considerably improve power factor, efficiency is high.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of LED drive circuit.
Background technology
In energy crisis and climate warming problem more and more serious today, energy-conservationly become social focus subject under discussion with environmental protection.LED gets more and more people's extensive concerning because of features such as plurality of advantages such as it is efficient, energy-saving and environmental protection, life-span length, rich color, little, the resistance to flicker of volume, reliability are high, regulation and control are convenient, is considered to 21 century the most promising lighting source.Traditional incandescent lamp efficiency is low, power consumption is high; Fluorescent lamp power saving, but useful life is short, frangible, and there is mercury pollution in discarded object; There is the shortcomings such as efficiency is low, power consumption is high, the life-span is short, hazards of electromagnetic radiation in high-intensity gas discharge lamp; If current poor efficiency, the traditional lighting of highly energy-consuming can be replaced with LED illumination, current more and more urgent energy shortage and ecological deterioration problem can be alleviated undoubtedly.Due to voltage-current characteristic and the temperature characterisitic of LED self, make the susceptibility of LED to electric current be higher than susceptibility to voltage, therefore can not be powered directly to LED by traditional power supply.Therefore, make with LED the problem that first lighting source will solve power drives, regulate although traditional LED drive power can realize LED luminance, can not realize power factor correction, input power factor is lower, and harmonic ratio is comparatively large, and efficiency is low.
Utility model content
The purpose of this utility model is to provide the LED drive circuit that a kind of power factor is high, efficiency is high, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of LED drive circuit, comprise inductance L 1, inductance L 2, resistance R1, electric capacity C1, LED group and triode VT1, described inductance L 1 one end connects 220V alternating current, the 220V alternating current other end connects inductance L 2, inductance L 2 other end connects diode D3 positive pole respectively, diode D4 negative pole and electric capacity C4, the electric capacity C4 other end is contact resistance R9 and inductance L 1 other end respectively, the resistance R9 other end connects electric capacity C3 and resistance R8 respectively, the resistance R8 other end connects the electric capacity C3 other end respectively, diode D6 positive pole and diode D5 negative pole, diode D5 positive pole connects LED group negative pole and diode D4 positive pole respectively, LED group positive pole is contact resistance R6 respectively, resistance R7, triode VT3 emitter, triode VT4 emitter, diode D1 negative pole, electric capacity C2, resistance R1 and electric capacity C1, the electric capacity C1 other end is the contact resistance R1 other end respectively, the electric capacity C2 other end and diode D1 positive pole ground connection, the described resistance R6 other end is connecting triode VT3 base stage respectively, triode VT2 collector electrode and triode VT1 emitter, triode VT1 collector electrode connects diode D7 negative pole, diode D7 positive pole connects diode D6 negative pole and resistance R2 respectively, the resistance R2 other end is contact resistance R3 respectively, triode VT2 emitter and triode VT1 base stage, the resistance R3 other end is connecting triode VT2 base stage and triode VT3 collector electrode respectively, the described resistance R7 other end is connecting triode VT4 base stage respectively, triode VT5 collector electrode and triode VT6 emitter, triode VT6 collector electrode connects diode D2 negative pole, diode D2 positive pole connects diode D3 negative pole and resistance R5 respectively, the resistance R5 other end is contact resistance R4 respectively, triode VT5 emitter and triode VT6 base stage, the resistance R4 other end is connecting triode VT4 collector electrode and triode VT5 base stage respectively.
As the utility model further scheme: described diode D3 and diode D6 is voltage stabilizing didoe.
Compared with prior art, the beneficial effects of the utility model are: the utility model circuit is with all-wave current-limit mode, from AC power Direct driver white LED lamp group, thus realize a kind of flicker free, the solid-state lighting lamp of high energy efficiency, circuit can at driving voltage just, negative bias moves period, adopt alternately electric switch working method, LED exciting current in the negative half period of driving voltage and positive half cycle is controlled and maintains a constant level, this processing mode can do the rectification of Current Control to alternating voltage, make it the direct current supply voltage becoming series LED lamp group, there is the electric current of clean almost ripple-free, considerably improve power factor, efficiency is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of LED drive circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of LED drive circuit, comprise inductance L 1, inductance L 2, resistance R1, electric capacity C1, LED group and triode VT1, inductance L 1 one end connects 220V alternating current, the 220V alternating current other end connects inductance L 2, inductance L 2 other end connects diode D3 positive pole respectively, diode D4 negative pole and electric capacity C4, the electric capacity C4 other end is contact resistance R9 and inductance L 1 other end respectively, the resistance R9 other end connects electric capacity C3 and resistance R8 respectively, the resistance R8 other end connects the electric capacity C3 other end respectively, diode D6 positive pole and diode D5 negative pole, diode D5 positive pole connects LED group negative pole and diode D4 positive pole respectively, LED group positive pole is contact resistance R6 respectively, resistance R7, triode VT3 emitter, triode VT4 emitter, diode D1 negative pole, electric capacity C2, resistance R1 and electric capacity C1, the electric capacity C1 other end is the contact resistance R1 other end respectively, the electric capacity C2 other end and diode D1 positive pole ground connection, the resistance R6 other end is connecting triode VT3 base stage respectively, triode VT2 collector electrode and triode VT1 emitter, triode VT1 collector electrode connects diode D7 negative pole, diode D7 positive pole connects diode D6 negative pole and resistance R2 respectively, the resistance R2 other end is contact resistance R3 respectively, triode VT2 emitter and triode VT1 base stage, the resistance R3 other end is connecting triode VT2 base stage and triode VT3 collector electrode respectively, the resistance R7 other end is connecting triode VT4 base stage respectively, triode VT5 collector electrode and triode VT6 emitter, triode VT6 collector electrode connects diode D2 negative pole, diode D2 positive pole connects diode D3 negative pole and resistance R5 respectively, the resistance R5 other end is contact resistance R4 respectively, triode VT5 emitter and triode VT6 base stage, the resistance R4 other end is connecting triode VT4 collector electrode and triode VT5 base stage respectively.
Diode D3 and diode D6 is voltage stabilizing didoe.
Operation principle of the present utility model is: transistor VT1 ~ VT6 and diode D2, D7 is all configured to the voltage controlled current switches of connecting, form two arms of H bridge, diode D4 and D5 forms two other arm of bridge, LED group is connected between the mid point of bridge, two points are VLED+ and VLEDGND respectively, alternating current is by a current limliting PTC resistance R9, electric capacity C3 and inductance L 1 are applied on circuit, equally, the neutral line of main alternating current is connected to the earth of circuit by inductance L 2, in positive half cycle, AC power bus is just relative to the earth, transistor VT1 obtains suitable base bias by resistance R2, electric current flows through diode D7, transistor VT1 and resistance R6, then LED group is flow through, the earth is entered by diode D4, equally, when negative half period, AC power bus is negative relative to the earth, transistor VT6 obtains base bias by resistance R5.Electric current flows through diode D2, transistor VT6 and resistance R4, then flows through LED group, enters AC power bus by diode D5, and like this, in a complete cycle, electric current flows through LED strip with equidirectional, obtains the effect of a full-wave rectification bridge.
Base-emitter due to transistor VT3 and VT4 is connected on current sense resistor R6 and R7, when the pressure drop rise on R6 and R7 to VT3 and VT4 base radio pressure above time, two transistor turns, this point, the base stage of triode VT1 and VT6 is all dragged down, and has upset the electric current by them in corresponding AC power half cycle, and the electric current flowing through transistor keeps constant by this way, exceed certain threshold value never, this threshold value is arranged by selecting the value of R6 and R7.The base current of VT1 and VT6 is limited in a safety value (being approximately 150 μ A) by VT2 and VT5, guarantees that they are crossed never and drives.When base radio pressure has exceeded the pressure drop on R6 and R8 that connect with R1 and R2 respectively to VT1 and VT6 separately, the suitable major part of VT1 and VT6 base current is by VT2 and VT5, by shunting to R6 and R7, the alternating current amplitude entering bus is subject to the restriction of CEFF reactance (1/2 π fCEFF) under basic frequency, can change by selecting C3 and C4.Inductance L 1 and L2 and electric capacity C4 help to reduce energy consumption, improve power factor simultaneously.
Claims (2)
1. a LED drive circuit, comprise inductance L 1, inductance L 2, resistance R1, electric capacity C1, LED group and triode VT1, it is characterized in that, described inductance L 1 one end connects 220V alternating current, the 220V alternating current other end connects inductance L 2, inductance L 2 other end connects diode D3 positive pole respectively, diode D4 negative pole and electric capacity C4, the electric capacity C4 other end is contact resistance R9 and inductance L 1 other end respectively, the resistance R9 other end connects electric capacity C3 and resistance R8 respectively, the resistance R8 other end connects the electric capacity C3 other end respectively, diode D6 positive pole and diode D5 negative pole, diode D5 positive pole connects LED group negative pole and diode D4 positive pole respectively, LED group positive pole is contact resistance R6 respectively, resistance R7, triode VT3 emitter, triode VT4 emitter, diode D1 negative pole, electric capacity C2, resistance R1 and electric capacity C1, the electric capacity C1 other end is the contact resistance R1 other end respectively, the electric capacity C2 other end and diode D1 positive pole ground connection, the described resistance R6 other end is connecting triode VT3 base stage respectively, triode VT2 collector electrode and triode VT1 emitter, triode VT1 collector electrode connects diode D7 negative pole, diode D7 positive pole connects diode D6 negative pole and resistance R2 respectively, the resistance R2 other end is contact resistance R3 respectively, triode VT2 emitter and triode VT1 base stage, the resistance R3 other end is connecting triode VT2 base stage and triode VT3 collector electrode respectively, the described resistance R7 other end is connecting triode VT4 base stage respectively, triode VT5 collector electrode and triode VT6 emitter, triode VT6 collector electrode connects diode D2 negative pole, diode D2 positive pole connects diode D3 negative pole and resistance R5 respectively, the resistance R5 other end is contact resistance R4 respectively, triode VT5 emitter and triode VT6 base stage, the resistance R4 other end is connecting triode VT4 collector electrode and triode VT5 base stage respectively.
2. LED drive circuit according to claim 1, is characterized in that, described diode D3 and diode D6 is voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520110215.9U CN204465966U (en) | 2015-02-15 | 2015-02-15 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520110215.9U CN204465966U (en) | 2015-02-15 | 2015-02-15 | A kind of LED drive circuit |
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| Publication Number | Publication Date |
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| CN204465966U true CN204465966U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520110215.9U Expired - Fee Related CN204465966U (en) | 2015-02-15 | 2015-02-15 | A kind of LED drive circuit |
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| CN (1) | CN204465966U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678567A (en) * | 2016-12-26 | 2017-05-17 | 海宁泰诺照明电器有限公司 | LED lamp and driver thereof |
-
2015
- 2015-02-15 CN CN201520110215.9U patent/CN204465966U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678567A (en) * | 2016-12-26 | 2017-05-17 | 海宁泰诺照明电器有限公司 | LED lamp and driver thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20160215 |
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| CF01 | Termination of patent right due to non-payment of annual fee |