CN204761761U

CN204761761U - LED drive circuit

Info

Publication number: CN204761761U
Application number: CN201520339644.3U
Authority: CN
Inventors: 刘利霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-22
Filing date: 2015-05-22
Publication date: 2015-11-11
Anticipated expiration: 2025-05-22

Abstract

The utility model discloses a LED drive circuit, including transformer T, the rectifier bridge, electric capacity C1, electric capacity C2, resistance R1, triode VT1, MOS pipe VR and one -way silicon controlled rectifier VS, transformer T coil L1 connects 220V alternating current both ends respectively in both ends, electric capacity C2 and rectifier bridge Q pin 1 are connected respectively to transformer T coil L2 one end, the transformer T coil L2 other end is connected to rectifier bridge Q pin 3, electric capacity C1 is connected respectively to rectifier bridge Q pin 4, electric capacity C6, one -way silicon controlled rectifier VS's the A utmost point, electric capacity C4, diode D7 negative pole and LED negative pole, it is anodal that diode D6 is connected respectively to rectifier bridge Q pin 2, electric capacity C3 and MOS pipe VR's the D utmost point. The utility model discloses a practical MOS pipe VR and the cooperation of one -way silicon controlled rectifier VS, can be stable provide constant current drive for LED, do not use any chip element, the interference killing feature is strong, stability is very high, circuit structure is simple moreover, and is with low costs, especially adapted using widely.

Description

A kind of LED drive circuit

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, the most complex structure of existing LED drive circuit, cost is high and efficiency is low.

Utility model content

The purpose of this utility model is to provide a kind of circuit structure simple 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 LED drive circuit, comprises transformer T, rectifier bridge, electric capacity C1, electric capacity C2, resistance R1, triode VT1, metal-oxide-semiconductor VR and one-way SCR VS, described transformer T coil L1 two ends connect 220V alternating current two ends respectively, transformer T coil L2 one end connects electric capacity C2 and rectifier bridge Q pin 1, the rectifier bridge Q pin 3 connection transformer T coil L2 other end respectively, and rectifier bridge Q pin 4 connects electric capacity C1 respectively, electric capacity C6, the A pole of one-way SCR VS, electric capacity C4, diode D7 negative pole and LED negative pole, rectifier bridge Q pin 2 connects diode D6 positive pole respectively, the D pole of electric capacity C3 and metal-oxide-semiconductor VR, diode D6 negative pole is connecting band woman's C2 other end and diode D5 positive pole respectively, and diode D5 negative pole connects the electric capacity C3 other end and resistance R1 respectively, and the resistance R1 other end connects the electric capacity C6 other end respectively, the G pole of metal-oxide-semiconductor VR, the K pole of triode VT1 collector electrode and one-way SCR VS, triode VT1 base stage connects S pole and the resistance R2 of metal-oxide-semiconductor VR respectively, and the resistance R2 other end is connecting triode VT1 emitter respectively, resistance R4, electric capacity C5 and resistance R5, the resistance R5 other end connects LED positive pole, and the described electric capacity C5 other end connects diode D7 positive pole and resistance R3 respectively, and the resistance R3 other end is the contact resistance R4 other end respectively, the G pole of the electric capacity C4 other end and one-way SCR VS.

As the utility model further scheme: described one-way SCR VS model is TL431.

Compared with prior art, the beneficial effects of the utility model are: the utility model coordinates by using metal-oxide-semiconductor VR and one-way SCR VS, can be stable provide constant current to drive to LED, do not use any chip component, antijamming capability is strong, and stability is very high, and circuit structure is simple, cost is low, is applicable to very much promoting the use of.

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, comprises transformer T, rectifier bridge, electric capacity C1, electric capacity C2, resistance R1, triode VT1, metal-oxide-semiconductor VR and one-way SCR VS, transformer T coil L1 two ends connect 220V alternating current two ends respectively, transformer T coil L2 one end connects electric capacity C2 and rectifier bridge Q pin 1, the rectifier bridge Q pin 3 connection transformer T coil L2 other end respectively, and rectifier bridge Q pin 4 connects electric capacity C1 respectively, electric capacity C6, the A pole of one-way SCR VS, electric capacity C4, diode D7 negative pole and LED negative pole, rectifier bridge Q pin 2 connects diode D6 positive pole respectively, the D pole of electric capacity C3 and metal-oxide-semiconductor VR, diode D6 negative pole is connecting band woman's C2 other end and diode D5 positive pole respectively, and diode D5 negative pole connects the electric capacity C3 other end and resistance R1 respectively, and the resistance R1 other end connects the electric capacity C6 other end respectively, the G pole of metal-oxide-semiconductor VR, the K pole of triode VT1 collector electrode and one-way SCR VS, triode VT1 base stage connects S pole and the resistance R2 of metal-oxide-semiconductor VR respectively, and the resistance R2 other end is connecting triode VT1 emitter respectively, resistance R4, electric capacity C5 and resistance R5, the resistance R5 other end connects LED positive pole, and the electric capacity C5 other end connects diode D7 positive pole and resistance R3 respectively, and the resistance R3 other end is the contact resistance R4 other end respectively, the G pole of the electric capacity C4 other end and one-way SCR VS.

One-way SCR VS model is TL431.

Operation principle of the present utility model is: refer to Fig. 1, 220V alternating current is through transformer T step-down, rectifier bridge Q rectification and electric capacity C1 filtering, in addition diode D5, diode D6, electric capacity C2 and electric capacity C3 forms voltage-multiplying circuit, resistance R4 and resistance R3 forms bleeder circuit, one-way SCR VS and resistance R1 forms sampling amplification circuit, triode VT1 and resistance R2 forms current-limiting protection circuit, metal-oxide-semiconductor VR adjusts pipe, electric capacity C5 is output filter capacitor, when output voltage reduces, f point current potential reduces, amplifying through one-way SCR VS inside makes e point voltage increase, after metal-oxide-semiconductor VR adjusts, b point current potential raises, otherwise, when output voltage increases, f point current potential raises, and e point current potential reduces, after metal-oxide-semiconductor VR adjusts, b point current potential reduces, thus make the constant current of stable output, when output current is greater than 5A, triode VT1 is in cut-off, within making output current be limited in 5A, thus reach the object of current limliting.

Claims

1. a LED drive circuit, comprises transformer T, rectifier bridge, electric capacity C1, electric capacity C2, resistance R1, triode VT1, metal-oxide-semiconductor VR and one-way SCR VS, it is characterized in that, described transformer T coil L1 two ends connect 220V alternating current two ends respectively, transformer T coil L2 one end connects electric capacity C2 and rectifier bridge Q pin 1 respectively, the rectifier bridge Q pin 3 connection transformer T coil L2 other end, rectifier bridge Q pin 4 connects electric capacity C1 respectively, electric capacity C6, the A pole of one-way SCR VS, electric capacity C4, diode D7 negative pole and LED negative pole, rectifier bridge Q pin 2 connects diode D6 positive pole respectively, the D pole of electric capacity C3 and metal-oxide-semiconductor VR, diode D6 negative pole is connecting band woman's C2 other end and diode D5 positive pole respectively, and diode D5 negative pole connects the electric capacity C3 other end and resistance R1 respectively, and the resistance R1 other end connects the electric capacity C6 other end respectively, the G pole of metal-oxide-semiconductor VR, the K pole of triode VT1 collector electrode and one-way SCR VS, triode VT1 base stage connects S pole and the resistance R2 of metal-oxide-semiconductor VR respectively, and the resistance R2 other end is connecting triode VT1 emitter respectively, resistance R4, electric capacity C5 and resistance R5, the resistance R5 other end connects LED positive pole, and the described electric capacity C5 other end connects diode D7 positive pole and resistance R3 respectively, and the resistance R3 other end is the contact resistance R4 other end respectively, the G pole of the electric capacity C4 other end and one-way SCR VS.

2. LED drive circuit according to claim 1, is characterized in that, described one-way SCR VS model is TL431.