CN204707313U

CN204707313U - A kind of LED protection circuit

Info

Publication number: CN204707313U
Application number: CN201520320995.XU
Authority: CN
Inventors: 尚传福
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-19
Filing date: 2015-05-19
Publication date: 2015-10-14
Anticipated expiration: 2025-05-19

Abstract

The utility model discloses a kind of LED protection circuit; comprise rectifier bridge Q, resistance R1, electric capacity C1, inductance L 1, transformer T, chip U1, diode D1 and diode D2; rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 3; reorganizer Q pin 2 connects inductance L 1, resistance R1 and electric capacity C1 respectively, and the electric capacity C1 other end is contact resistance R7, inductance L 2 and rectifier bridge Q pin 4 respectively.The utility model power circuit adopts wide operating voltage ON-OFF control circuit chip U1, can use in 80 ~ 270V electric main input range, substantially worldwide all electric main scopes are included, it can use at global anywhere, even if power network fluctuation also can not affect the illuminating effect of LED, stability is high.

Description

A kind of LED protection circuit

Technical field

The utility model relates to a kind of protective circuit, specifically a kind of LED protection circuit.

Background technology

Along with the development of electronic technology, the luminous efficiency of great power LED improves constantly, and present stage has has met or exceeded the luminous efficiency of electricity-saving lamp, and great power LED to have brightness high, color rendering is good, not easily generate heat, driving voltage is low, the distinguishing feature of overlong service life, LED semiconductor lighting has green, environmental protection, durable feature, becomes the first-selected illuminating device replacing conventional lights source.

LED is low-voltage, big current luminescent device, can not be connected directly between in AC network and use, and must have drive circuit, and due to LED be current mode device, constant current must be adopted to drive, otherwise easily burn LED.Due to conventional lights source such as screw socket, bayonet-type bulb and some shot-lights, volume own is just smaller, LED illumination will replace these conventional lights sources, just very high to the requirement of LED driver, need volume little, adapt to wide input voltage range, constant output current, efficiency is high, generates heat little, also has fail safe high, anti-electromagnetic interference, and long-life requirement.Existing interchange input great power LED power circuit, due to all restrictions, can only be accomplished a part for above-mentioned requirements or a few part, can not reach requirement completely, limit the popularization of LED semiconductor lighting.

Utility model content

The purpose of this utility model is to provide that a kind of circuit structure is simple, the LED protection circuit of wide input voltage range, 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 protection circuit, comprises rectifier bridge Q, resistance R1, electric capacity C1, inductance L 1, transformer T, chip U1, diode D1 and diode D2, described rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 3, and reorganizer Q pin 2 connects inductance L 1 respectively, resistance R1 and electric capacity C1, the electric capacity C1 other end is contact resistance R7 respectively, inductance L 2 and rectifier bridge Q pin 4, the resistance R7 other end connect electric capacity C2 respectively, chip U1 pin S, electric capacity C3, resistance R2, electric capacity C4, transformer T coil L5 and electric capacity C5 ground connection, the electric capacity C2 other end is the contact resistance R1 other end respectively, inductance L 1 other end and transformer T coil L3, the transformer T coil L3 other end connects chip U1 pin D, and chip U1 pin FB is the contact resistance R2 other end respectively, the electric capacity C4 other end and resistance R3, the chip U1 pin BP other end connects the electric capacity C3 other end and resistance R4 respectively, the resistance R4 other end connects the electric capacity C5 other end and diode D2 negative pole respectively, diode D2 positive pole contact resistance R5, the resistance R5 other end is the contact resistance R3 other end and the transformer T coil L5 other end respectively, and transformer T coil L4 one end connects electric capacity C6 respectively, resistance R6, electric capacity C7 and LED positive pole, the transformer T coil L4 other end connects diode D1 negative pole, and diode D1 positive pole connects the electric capacity C6 other end respectively, the resistance R6 other end, the electric capacity C7 other end and LED negative pole.

As the utility model further scheme: described chip U1 model is LNK605DG.

Compared with prior art; the beneficial effects of the utility model are: the utility model LED protection circuit adopts wide operating voltage ON-OFF control circuit chip U1; can use in 80 ~ 270V electric main input range; substantially worldwide all electric main scopes are included; it can use at global anywhere; even if power network fluctuation also can not affect the illuminating effect of LED, stability is high.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of LED protection 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 protection circuit, comprises rectifier bridge Q, resistance R1, electric capacity C1, inductance L 1, transformer T, chip U1, diode D1 and diode D2, rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 3, and reorganizer Q pin 2 connects inductance L 1 respectively, resistance R1 and electric capacity C1, the electric capacity C1 other end is contact resistance R7 respectively, inductance L 2 and rectifier bridge Q pin 4, the resistance R7 other end connect electric capacity C2 respectively, chip U1 pin S, electric capacity C3, resistance R2, electric capacity C4, transformer T coil L5 and electric capacity C5 ground connection, the electric capacity C2 other end is the contact resistance R1 other end respectively, inductance L 1 other end and transformer T coil L3, the transformer T coil L3 other end connects chip U1 pin D, and chip U1 pin FB is the contact resistance R2 other end respectively, the electric capacity C4 other end and resistance R3, the chip U1 pin BP other end connects the electric capacity C3 other end and resistance R4 respectively, the resistance R4 other end connects the electric capacity C5 other end and diode D2 negative pole respectively, diode D2 positive pole contact resistance R5, the resistance R5 other end is the contact resistance R3 other end and the transformer T coil L5 other end respectively, and transformer T coil L4 one end connects electric capacity C6 respectively, resistance R6, electric capacity C7 and LED positive pole, the transformer T coil L4 other end connects diode D1 negative pole, and diode D1 positive pole connects the electric capacity C6 other end respectively, the resistance R6 other end, the electric capacity C7 other end and LED negative pole.

Chip U1 model is LNK605DG.

Operation principle of the present utility model is: refer to Fig. 1, circuit comprises transient voltage suppression circuit, rectification circuit 10, filter circuit, output circuit, and ON-OFF control circuit, wherein transient voltage suppression circuit, when energized, 220V alternating current is after rectifying and wave-filtering, after eliminating differential mode interference signal and a small amount of alternating component and labile element, formed and stablize level and smooth direct current, this direct current sends into chip U1 pin D after this transformer T coil L3, there is a high-voltage constant current source to be that the electric capacity C3 that chip U1 pin BP holds charges in chip U1 pin D inside, with the voltage rise at electric capacity C3 two ends after more than 6V, the operating voltage of chip U1 is set up and is opened inner MOSFET, now in transformer T coil L3, electric current linearly increases and by stored energy in transformer coil L1, after electric current rises to the current-limiting points of chip U1, this MOSFET turns off, after this MOSFET turns off, the energy transferring being stored in this transformer T coil L3 is that LED powers to transformer T coil L4 and transformer T coil L5.

The rectifier filter circuit that electric capacity C6 and this rectifier diode D1 forms carries out filtering to output current, voltage, and this coupling capacitance C7, for filtering out the high-frequency noise of output, improves the antijamming capability of system.

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. a LED protection circuit, comprises rectifier bridge Q, resistance R1, electric capacity C1, inductance L 1, transformer T, chip U1, diode D1 and diode D2, is characterized in that, described rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 3, and reorganizer Q pin 2 connects inductance L 1 respectively, resistance R1 and electric capacity C1, the electric capacity C1 other end is contact resistance R7 respectively, inductance L 2 and rectifier bridge Q pin 4, the resistance R7 other end connect electric capacity C2 respectively, chip U1 pin S, electric capacity C3, resistance R2, electric capacity C4, transformer T coil L5 and electric capacity C5 ground connection, the electric capacity C2 other end is the contact resistance R1 other end respectively, inductance L 1 other end and transformer T coil L3, the transformer T coil L3 other end connects chip U1 pin D, and chip U1 pin FB is the contact resistance R2 other end respectively, the electric capacity C4 other end and resistance R3, the chip U1 pin BP other end connects the electric capacity C3 other end and resistance R4 respectively, the resistance R4 other end connects the electric capacity C5 other end and diode D2 negative pole respectively, diode D2 positive pole contact resistance R5, the resistance R5 other end is the contact resistance R3 other end and the transformer T coil L5 other end respectively, and transformer T coil L4 one end connects electric capacity C6 respectively, resistance R6, electric capacity C7 and LED positive pole, the transformer T coil L4 other end connects diode D1 negative pole, and diode D1 positive pole connects the electric capacity C6 other end respectively, the resistance R6 other end, the electric capacity C7 other end and LED negative pole.

2. LED protection circuit according to claim 1, is characterized in that, described chip U1 model is LNK605DG.