CN204859703U - Energy -conserving LED drive circuit - Google Patents

Abstract

The utility model discloses an energy -conserving LED drive circuit, including diode VD1, electric capacity C1, resistance R1, field effect transistor VS, transformer T and audion V1, the diode VD1 positive pole VCC that connects, electric capacity C1 is connected respectively to diode VD1 negative pole, resistance R1, resistance R3, resistance R6, triode V2 collecting electrode, resistance R7 and triode V4 collecting electrode, electric capacity C2 is connected respectively to the resistance R1 other end, resistance R2 and diode VD2 are anodal, the electric capacity C2 other end is the connecting resistance R2 other end and triode V1 base respectively, triode V1 collecting electrode is the connecting resistance R3 other end and electric capacity C3 respectively, the electric capacity C3 other end is connecting resistance R4 and triode V4 projecting pole respectively. The utility model discloses energy -conserving LED drive circuit does not use the control of any chip element, and the interference killing feature is strong, and stability is high, and circuit structure is simple, and is with low costs, small, especially adapted using widely.

Description

A kind of energy-saving LED drive circuit

Technical field

The utility model relates to a kind of LED, specifically a kind of energy-saving 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, how to provide stability is high, cost is low, fail safe is high LED drive circuit to become the research direction of Ge great LED producer.

Utility model content

The purpose of this utility model is to provide a kind of energy-saving LED drive circuit, 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 energy-saving LED drive circuit, comprise diode VD1, electric capacity C1, resistance R1, field effect transistor VS, transformer T and triode V1, described diode VD1 positive pole connects power supply VCC, diode VD1 negative pole connects electric capacity C1 respectively, resistance R1, resistance R3, resistance R6, triode V2 collector electrode, resistance R7 and triode V4 collector electrode, the resistance R1 other end connects electric capacity C2 respectively, resistance R2 and diode VD2 positive pole, the electric capacity C2 other end is the contact resistance R2 other end and triode V1 base stage respectively, triode V1 collector electrode is the contact resistance R3 other end and electric capacity C3 respectively, the electric capacity C3 other end is contact resistance R4 and triode V4 emitter respectively, the resistance R4 other end is connecting triode V3 base stage and resistance R5 respectively, triode V3 collector electrode is the contact resistance R6 other end and triode V2 base stage respectively, triode V2 emitter connects diode VD3 positive pole respectively, the G pole of electric capacity C4 and field effect transistor VS, diode VD3 negative pole connects diode VD2 negative pole, D pole connection transformer T coil L1 and the diode VD4 positive pole respectively of field effect transistor VS, diode VD4 negative pole connects diode VD5 negative pole, diode VD5 positive pole connects the S pole of field effect transistor VS respectively, the electric capacity C4 other end, triode V3 emitter, the resistance R5 other end, triode V1 emitter and the electric capacity C1 other end, the described transformer T coil L1 other end is connecting triode V4 base stage and the resistance R7 other end respectively, transformer T coil L2 one end contact resistance R8, the resistance R8 other end connects LED string, the LED string other end connection transformer T coil L2 other end.

As further program of the utility model: described power supply VCC voltage is 24V.

As the utility model further scheme: described field effect transistor VS adopts IRF1644.

Compared with prior art, the beneficial effects of the utility model are: the utility model energy-saving LED drive circuit does not use any chip component to control, and antijamming capability is strong, and stability is high, and circuit structure is simple, and cost is low, and volume is little, is applicable to very much promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of energy-saving 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 energy-saving LED drive circuit, comprise diode VD1, electric capacity C1, resistance R1, field effect transistor VS, transformer T and triode V1, diode VD1 positive pole connects power supply VCC, diode VD1 negative pole connects electric capacity C1 respectively, resistance R1, resistance R3, resistance R6, triode V2 collector electrode, resistance R7 and triode V4 collector electrode, the resistance R1 other end connects electric capacity C2 respectively, resistance R2 and diode VD2 positive pole, the electric capacity C2 other end is the contact resistance R2 other end and triode V1 base stage respectively, triode V1 collector electrode is the contact resistance R3 other end and electric capacity C3 respectively, the electric capacity C3 other end is contact resistance R4 and triode V4 emitter respectively, the resistance R4 other end is connecting triode V3 base stage and resistance R5 respectively, triode V3 collector electrode is the contact resistance R6 other end and triode V2 base stage respectively, triode V2 emitter connects diode VD3 positive pole respectively, the G pole of electric capacity C4 and field effect transistor VS, diode VD3 negative pole connects diode VD2 negative pole, D pole connection transformer T coil L1 and the diode VD4 positive pole respectively of field effect transistor VS, diode VD4 negative pole connects diode VD5 negative pole, diode VD5 positive pole connects the S pole of field effect transistor VS respectively, the electric capacity C4 other end, triode V3 emitter, the resistance R5 other end, triode V1 emitter and the electric capacity C1 other end, the transformer T coil L1 other end is connecting triode V4 base stage and the resistance R7 other end respectively, transformer T coil L2 one end contact resistance R8, the resistance R8 other end connects LED string, the LED string other end connection transformer T coil L2 other end.

Power supply VCC voltage is 24V.

Field effect transistor VS adopts IRF1644.

Operation principle of the present utility model is: refer to Fig. 1, and+24V voltage again by after electric capacity C1 filtering, forms galvanic current pressure by diode VD1, this voltage is added to the base stage of triode V1 through resistance R1 and R2, V1 obtains base current, V1 saturation conduction, the current collection very low level of V1.

Simultaneously, 24v voltage is added to the collector electrode of V3 by resistance R6, but owing to just starting, triode V3 does not have base voltage and ends, therefore, and the current collection very high level of V3, so, 24V voltage is added to again the base stage of triode V2 by R6, make triode V2 conducting, the G very high level of field effect transistor VS, VS conducting, source current is by the primary coil L1 of R7 and transformer T, and meanwhile, electric capacity C4 is charged, after VS conducting, because R7 has certain voltage, this is just for triode V4 provides a base voltage, V4 conducting.

Supply voltage is added to the right-hand member of C3 by the collection-emitter-base bandgap grading of V4, and start C3 charging, along with the carrying out of charging, C3 right-hand member current potential constantly rises, when the base voltage rising to V3 is 0.7V, and V3 conducting, the current collection very low level of V3.At this moment, due to the effect of diode VD2, reduce the voltage of resistance R1 lower end, also dragged down V1 base voltage simultaneously, made triode V1 become cut-off from conducting, the current collection very high level of V1.Because electric capacity C3 both end voltage can not be suddenlyd change, electric current in the other direction is at this moment had to continue conducting by C3, V3, while V3 conducting, electric capacity C2 start electric discharge, when discharge into make the grid voltage of VS lower than cut-in voltage time, VS ends, and is blocked by the electric current of transformer T coil L1.

After VS cut-off, V4 ends owing to can not get base voltage, at this moment, source current continues charging by R3, R4 and R5 to C3, and along with the carrying out of charging, electric current constantly reduces, when the base voltage being charged to V3 is lower than 0.7V, V3 ends, the current collection very high level of V3.Then repetition said process is started.

Change electric capacity C3 and C4 and can change operating frequency.Wherein diode VD1 connects the reverse current instead for blocking electric power polarity, and VD3 is for C4 provides discharge loop, and C2 is used for the voltage of level and smooth R2, and the object of diode VD4 and VD5 is that the peak voltage preventing transformer T from producing punctures field effect transistor VS.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

Claims (3)

1. an energy-saving LED drive circuit, comprise diode VD1, electric capacity C1, resistance R1, field effect transistor VS, transformer T and triode V1, it is characterized in that, described diode VD1 positive pole connects power supply VCC, diode VD1 negative pole connects electric capacity C1 respectively, resistance R1, resistance R3, resistance R6, triode V2 collector electrode, resistance R7 and triode V4 collector electrode, the resistance R1 other end connects electric capacity C2 respectively, resistance R2 and diode VD2 positive pole, the electric capacity C2 other end is the contact resistance R2 other end and triode V1 base stage respectively, triode V1 collector electrode is the contact resistance R3 other end and electric capacity C3 respectively, the electric capacity C3 other end is contact resistance R4 and triode V4 emitter respectively, the resistance R4 other end is connecting triode V3 base stage and resistance R5 respectively, triode V3 collector electrode is the contact resistance R6 other end and triode V2 base stage respectively, triode V2 emitter connects diode VD3 positive pole respectively, the G pole of electric capacity C4 and field effect transistor VS, diode VD3 negative pole connects diode VD2 negative pole, D pole connection transformer T coil L1 and the diode VD4 positive pole respectively of field effect transistor VS, diode VD4 negative pole connects diode VD5 negative pole, diode VD5 positive pole connects the S pole of field effect transistor VS respectively, the electric capacity C4 other end, triode V3 emitter, the resistance R5 other end, triode V1 emitter and the electric capacity C1 other end, the described transformer T coil L1 other end is connecting triode V4 base stage and the resistance R7 other end respectively, transformer T coil L2 one end contact resistance R8, the resistance R8 other end connects LED string, the LED string other end connection transformer T coil L2 other end.

2. energy-saving LED drive circuit according to claim 1, is characterized in that, described power supply VCC voltage is 24V.

3. energy-saving LED drive circuit according to claim 1, is characterized in that, described field effect transistor VS adopts IRF1644.