CN204836679U

CN204836679U - Intelligence LED drive circuit

Info

Publication number: CN204836679U
Application number: CN201520512894.2U
Authority: CN
Inventors: 傅亚蓉
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-07-14
Filing date: 2015-07-14
Publication date: 2015-12-02
Anticipated expiration: 2025-07-14

Abstract

The utility model discloses an intelligence LED drive circuit, including electric capacity C1, inductance L1, rectifier bridge Q, opto -coupler U1, chip U2, transformer T and diode D1, 220V alternating current one end and rectifier bridge Q pin 1 are connected respectively to electric capacity C1 one end, inductance L1 is connected to rectifier bridge Q pin 3, the electric capacity C1 other end and the 220V alternating current other end are connected respectively to the inductance L1 other end, electric capacity C2 is connected respectively to rectifier bridge Q pin 2, electric capacity C3, resistance R1, diode D2 negative pole, electric capacity C4, resistance R3 and LED are anodal, chip U2 pin 1 is connected respectively to rectifier bridge Q pin 4, the electric capacity C2 other end, the electric capacity C3 other end, electric capacity C6 and transformer T coil L2, it is anodal that diode D1 is connected to the transformer T coil L2 other end. The utility model discloses intelligence LED drive circuit can complete control LED drive current, the constant current precision is high, high efficiency, low -power consumption, circuit structure is simple in addition, and is small, with low costs, is fit for using widely.

Description

A kind of intelligent LED drive circuit

Technical field

The utility model relates to a kind of drive circuit, specifically a kind of intelligent 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 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 driving, how to provide stability is high, cost is low LED power 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 intelligent 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 intelligent LED drive circuit, comprises electric capacity C1, inductance L 1, rectifier bridge Q, optocoupler U1, chip U2, transformer T and diode D1, described electric capacity C1 one end connects 220V alternating current one end and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects inductance L 1, and inductance L 1 other end connects the electric capacity C1 other end and the 220V alternating current other end respectively, and rectifier bridge Q pin 2 connects electric capacity C2 respectively, electric capacity C3, resistance R1, diode D2 negative pole, electric capacity C4, resistance R3 and LED positive pole, rectifier bridge Q pin 4 connects chip U2 pin 1 respectively, the electric capacity C2 other end, the electric capacity C3 other end, electric capacity C6 and transformer T coil L2, the transformer T coil L2 other end connects diode D1 positive pole, and diode D1 negative pole is the contact resistance R1 other end respectively, the electric capacity C6 other end, diode D3 negative pole, resistance R8 and chip U2 pin 5, diode D3 positive pole contact resistance R6 respectively, resistance R7 and the resistance R8 other end ground connection, the resistance R6 other end connects S pole and the chip U2 pin 4 of field effect transistor Q1 respectively, the G pole contact resistance R7 other end and the resistance R9 respectively of field effect transistor Q1, the resistance R9 other end connects chip U2 pin 6, the D pole of field effect transistor Q1 connects diode D2 positive pole and transformer T coil L3 respectively, and the transformer T coil L3 other end connects the electric capacity C4 other end respectively, the resistance R3 other end, resistance R4, resistance R5 and optocoupler U1 pin 3, the resistance R4 other end connect LED negative pole respectively, the resistance R5 other end and optocoupler U1 pin 4, optocoupler U1 pin 1 distinguishes contact resistance R10 and electric capacity C5, electric capacity C5 other end contact resistance R11 and ground connection, and the resistance R11 other end connects chip U2 pin 3, the chip U2 pin 2 contact resistance R10 other end, described chip U2 is ST6850.

As further program of the utility model: described optocoupler U1 model is 4N25.

As the utility model further scheme: described diode D3 is voltage stabilizing didoe.

Compared with prior art, the beneficial effects of the utility model are: the utility model intelligent LED drive circuit can the drive current of control LED completely, and constant current accuracy is high, high efficiency, low-power consumption, circuit structure is simple in addition, and volume is little, cost is low, is applicable to promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of intelligent 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 intelligent LED drive circuit, comprises electric capacity C1, inductance L 1, rectifier bridge Q, optocoupler U1, chip U2, transformer T and diode D1, electric capacity C1 one end connects 220V alternating current one end and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects inductance L 1, and inductance L 1 other end connects the electric capacity C1 other end and the 220V alternating current other end respectively, and rectifier bridge Q pin 2 connects electric capacity C2 respectively, electric capacity C3, resistance R1, diode D2 negative pole, electric capacity C4, resistance R3 and LED positive pole, rectifier bridge Q pin 4 connects chip U2 pin 1 respectively, the electric capacity C2 other end, the electric capacity C3 other end, electric capacity C6 and transformer T coil L2, the transformer T coil L2 other end connects diode D1 positive pole, and diode D1 negative pole is the contact resistance R1 other end respectively, the electric capacity C6 other end, diode D3 negative pole, resistance R8 and chip U2 pin 5, diode D3 positive pole contact resistance R6 respectively, resistance R7 and the resistance R8 other end ground connection, the resistance R6 other end connects S pole and the chip U2 pin 4 of field effect transistor Q1 respectively, the G pole contact resistance R7 other end and the resistance R9 respectively of field effect transistor Q1, the resistance R9 other end connects chip U2 pin 6, the D pole of field effect transistor Q1 connects diode D2 positive pole and transformer T coil L3 respectively, and the transformer T coil L3 other end connects the electric capacity C4 other end respectively, the resistance R3 other end, resistance R4, resistance R5 and optocoupler U1 pin 3, the resistance R4 other end connect LED negative pole respectively, the resistance R5 other end and optocoupler U1 pin 4, optocoupler U1 pin 1 distinguishes contact resistance R10 and electric capacity C5, electric capacity C5 other end contact resistance R11 and ground connection, and the resistance R11 other end connects chip U2 pin 3, the chip U2 pin 2 contact resistance R10 other end, chip U2 is ST6850.

Optocoupler U1 model is 4N25.

Diode D3 is voltage stabilizing didoe.

Operation principle of the present utility model is: refer to Fig. 1, circuit adopts 220V to exchange access, pass through bridge rectifier, directly be sent to LED positive pole, then field effect transistor Q1 is got back to by LED negative pole through transformer, last get back to 220V by rectifier bridge Q again and exchange the other end, this loop is the primary circuit of this circuit when having a LED load.When not having LED load, resistance R3 serves as load protection circuit, and ensure that circuit can not short circuit, electric capacity C4 serves filtering here and carrys out the effect of balanced load LED both end voltage with discharge and recharge form, and D2 is fly-wheel diode, ensures that transformer T normally works; Fig. 1 the latter half, form feedback regulating circuit primarily of chip U2, optocoupler U1 and field effect transistor Q1, the high frequency switching circuit fast that Q1 can send according to chip U2, sends high-frequency current to transformer T, thus make this circuit export high-frequency current, feedback control procedure is as follows, and when load LED current is transshipped, electric current arrives optocoupler U1, optocoupler U1 output end voltage is reduced, feed back to chip U2, i.e. adjustable voltage and frequency, thus it is luminous to make circuit export constant current driven LED simultaneously.

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

1. an intelligent LED drive circuit, comprises electric capacity C1, inductance L 1, rectifier bridge Q, optocoupler U1, chip U2, transformer T and diode D1, it is characterized in that, described electric capacity C1 one end connects 220V alternating current one end and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects inductance L 1, inductance L 1 other end connects the electric capacity C1 other end and the 220V alternating current other end respectively, and rectifier bridge Q pin 2 connects electric capacity C2 respectively, electric capacity C3, resistance R1, diode D2 negative pole, electric capacity C4, resistance R3 and LED positive pole, rectifier bridge Q pin 4 connects chip U2 pin 1 respectively, the electric capacity C2 other end, the electric capacity C3 other end, electric capacity C6 and transformer T coil L2, the transformer T coil L2 other end connects diode D1 positive pole, and diode D1 negative pole is the contact resistance R1 other end respectively, the electric capacity C6 other end, diode D3 negative pole, resistance R8 and chip U2 pin 5, diode D3 positive pole contact resistance R6 respectively, resistance R7 and the resistance R8 other end ground connection, the resistance R6 other end connects S pole and the chip U2 pin 4 of field effect transistor Q1 respectively, the G pole contact resistance R7 other end and the resistance R9 respectively of field effect transistor Q1, the resistance R9 other end connects chip U2 pin 6, the D pole of field effect transistor Q1 connects diode D2 positive pole and transformer T coil L3 respectively, and the transformer T coil L3 other end connects the electric capacity C4 other end respectively, the resistance R3 other end, resistance R4, resistance R5 and optocoupler U1 pin 3, the resistance R4 other end connect LED negative pole respectively, the resistance R5 other end and optocoupler U1 pin 4, optocoupler U1 pin 1 distinguishes contact resistance R10 and electric capacity C5, electric capacity C5 other end contact resistance R11 and ground connection, and the resistance R11 other end connects chip U2 pin 3, the chip U2 pin 2 contact resistance R10 other end, described chip U2 is ST6850.

2. intelligent LED drive circuit according to claim 1, is characterized in that, described optocoupler U1 model is 4N25.

3. intelligent LED drive circuit according to claim 1, is characterized in that, described diode D3 is voltage stabilizing didoe.