CN202425095U

CN202425095U - Power circuit for LED (light emitting diode) lamp

Info

Publication number: CN202425095U
Application number: CN2011205719709U
Authority: CN
Inventors: 胡益锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2012-09-05
Anticipated expiration: 2021-12-31

Abstract

The utility model relates to a power circuit for an LED (light emitting diode) lamp. The power circuit is a conversion circuit for converting mains supply into direct current ripple voltage with ripple frequency being between 100Hz and 200Hz. As the power circuit for the LED lamp can convert mains supply into direct current ripple voltage, the LED is switched on to emit light only in a pulse high level receiving time interval but stops emitting light in pulse low level receiving time interval, and therefore, the LED is in an on/off alternate state, the fatigue of the LED, caused by long-time continuous working, can be avoided, the heat productivity is reduced, and further, the service life of the LED is prolonged greatly, and the consumption of nonferrous material for a radiator is reduced.

Description

A kind of LED lighting lamp power circuit

Technical field

The utility model relates to a kind of power circuit, specifically is exactly LED lighting lamp power circuit.

Background technology

Along with people's is deep further to the understanding of energy-conserving and environment-protective theory, and the encouragement of national policy, the application of led light source are just constantly promoted.The LED lamp mainly divides the LED fluorescent lamp and the small power LED lamp (in the 15W) than high-power flat street lamp (more than the 30W) and family's use of outdoor use.The relation of the luminous efficiency of LED illuminating lamp and useful life and its power circuit is very big, and existing LED illuminating lamp is all taked DC power supply circuit stably, and is to make electric current and voltage stable as best one can; Make a general survey of present more famous LED enterprise; Comprise Beijing Ou Pusi, go up that Hypon power is general, the famous LED illumination in positive Thailand in Zhejiang, Wenzhou optically focused, Shenzhen Ge Limei and brand Philip, the world or the like enterprise, all at the LED light fixture that uses traditional DC circuit to drive, they produce with Ou Pusi, just Thailand is the outdoor high-power LED street lamp of representative; All be that the employing Switching Power Supply is a drive circuit; And for low-power LED lamp (being no more than 15W), then be to be bulb type, the fluorescent lamp type household LED lamp of representative with the Philip, they have adopted traditional capacitance current-limiting full-bridge rectification formula DC power-supply circuit; The LED lamp luminous intensity of design is very high although it is so; But the most fatal shortcoming can make the lamp pearl hot exactly, and as long as LED lamp pearl is one hot, and light decay will be accelerated greatly; Thereby will obviously shorten useful life of LED, than nominal that useful life, (50,000 hours) will lack is many.Experiment proof:, will drop to the useful life of lamp pearl below 6000 hours and (refer to that light decay is greater than being end 30% o'clock useful life) if temperature rise reaches 80 ° more than the C.Therefore, how the producer of all at present production high-power LED illuminations dispels the heat and improves on the external power supply Study on Efficiency if all resting on, and all is in heat radiation, to work hard; The LED lamp that they dispatch from the factory is owing to be equipped with big volume aluminium heat sink, and the decision high-powered LED lamp can only be a slab design, and weight is not light; With the 130WLED of Ou Pu department flat lamp is example, and nominal weight reaches 15kg, is typical heavy heat radiating type; And owing to be slab design, lighting angle is no more than 120 degree.And bulb type LED will have most area to adopt aluminum metal to be used for heat radiation, and fluorescent lamp mainly relies on length long, and area is big, and built-in aluminium plate wiring board is accomplished and dispelled the heat.

Summary of the invention

The purpose of the utility model be for the deficiency that overcomes prior art provide the heating of a kind of LED of making illuminating lamp less, the LED lighting lamp power circuit that consumes of long service life, minimizing heat transmission nonferrous materials.

For realizing above-mentioned purpose, the technical solution that the utility model is taked is following: a kind of LED lighting lamp power circuit is characterized in that: said power circuit is for converting civil power into the change-over circuit of dc pulse moving voltage, and ripple frequency is at 100 to 200 hertz.

The beneficial effect of the utility model is: because this LED lighting lamp power circuit converts civil power into dc pulse moving voltage; LED only when accepting the pulse high level period conducting luminous; And when accepting the pulses low period, end not luminous; So LED just is in work rest wheel stream mode, has prevented the fatigue phenomenon that LED causes because being in long-term continuous operation, has reduced caloric value; Thereby prolonged the useful life of LED greatly, and reduced radiator and consume with nonferrous materials.Because pulse frequency is enough high, be higher than the persistence of vision frequency of people's naked eyes simultaneously, the stroboscopic of LED is also imperceptible.

To combine accompanying drawing and specific embodiment that the utility model is described further below.

Description of drawings

Accompanying drawing 1 is the utility model specific embodiment schematic block circuit diagram;

Accompanying drawing 2 is another specific embodiment schematic block circuit diagram of the utility model;

Accompanying drawing 3 is an oscillating impulse generation circuit specific embodiment schematic block circuit diagram;

Accompanying drawing 4 is another specific embodiment schematic block circuit diagram of oscillating impulse generation circuit.

Embodiment

The new LED lighting lamp power circuit of this practicality is the change-over circuit that civil power is converted into dc pulse moving voltage; Ripple frequency is at 100 to 200 hertz, and ripple frequency is crossed the low situation that then can produce stroboscopic, and ripple frequency is too high; Then cooling-down effect is not obvious, is the best with 100 to 120 hertz.Circuit can have various ways; Can adopt AC side to be serially connected with the full-bridge rectification formula dc pulse power supply circuits of current limiting capacitance for low-power LED illuminating lamp (being no more than 15W); As shown in Figure 1, different with traditional full bridge rectifier is that the direct current outlet side is not provided with filter capacitor, directly exports the power supply that dc pulse moving voltage is a low-power LED illuminating lamp; The capacity of current limiting capacitance is confirmed according to the concrete power of LED illuminating lamp, is repeated no more here.

For than high-power LED illuminating lamp (surpass 30W); As shown in Figure 2; Said change-over circuit comprises switching power supply, electronic switching circuit and oscillating impulse generation circuit; The output of said switching power supply is connected with the electronic switching circuit input, and the output of said oscillating impulse generation circuit is connected the break-make of controlling electronic switch with the control end of electronic switching circuit, and electronic switching circuit is output as the LED illuminating lamp power supply is provided.Switching power supply can be selected ripe circuit for use, because metal-oxide-semiconductor has good switching characteristic, power is big; Therefore wherein the switch element of electronic switching circuit selects for use metal-oxide-semiconductor to be advisable; Can certainly select other power components for use, like the high power switch triode, said oscillating impulse generation circuit is by being that the oscillating circuit that core and peripheral cell thereof are formed constitutes with 555 time-base circuits; As shown in Figure 3, frequency of oscillation and duty ratio can reach through the resistance of regulating resistance R A and RB; Oscillating circuit can also adopt discrete component to form; As shown in Figure 4; Complex oscillation circuit with two common triode Q1 and Q2 composition; Select for use PNP and NPN triode to form in this specific embodiment, the output of oscillating circuit is connected the conducting of control switch pipe or metal-oxide-semiconductor and ends with the grid of the base stage of switching tube or metal-oxide-semiconductor, the output square wave pulse voltage.Normally adopt many group LED lamps to form in order to adapt to high-power LED illuminating lamp; Therefore can also be provided with multiplexer electronic switching for space in the said change-over circuit and for many group LED illuminating lamps power supply is provided, multiplexer electronic switching for space is preferably time sharing power supply under oscillating circuit control.

Claims

1. LED lighting lamp power circuit is characterized in that: said power circuit is for converting civil power into the change-over circuit of dc pulse moving voltage, and ripple frequency is at 100 to 200 hertz.

2. LED lighting lamp power circuit according to claim 1 is characterized in that: said change-over circuit is the full-bridge rectification formula dc pulse power supply circuits that AC side is serially connected with current limiting capacitance.

3. LED lighting lamp power circuit according to claim 1; It is characterized in that: said change-over circuit comprises switching power supply, electronic switching circuit and oscillating impulse generation circuit; The output of said switching power supply is connected with the electronic switching circuit input; The output of said oscillating impulse generation circuit is connected the break-make of controlling electronic switch with the control end of electronic switching circuit, and electronic switching circuit is output as the LED illuminating lamp power supply is provided.

4. LED lighting lamp power circuit according to claim 3 is characterized in that: be provided with multiplexer electronic switching for space in the said change-over circuit and for many group LED illuminating lamps power supply be provided.

5. according to claim 3 or 4 described LED lighting lamp power circuit, it is characterized in that: the switch element of said electronic switching circuit is selected metal-oxide-semiconductor or switching tube for use.

6. according to claim 3 or 4 described LED lighting lamp power circuit, it is characterized in that: said oscillating impulse generation circuit is by being that the oscillating circuit that core and peripheral cell thereof are formed constitutes with 555 time-base circuits.

7. according to claim 3 or 4 described LED lighting lamp power circuit, it is characterized in that: said oscillating impulse generation circuit is the complex oscillation circuit that core is formed by two common triodes.