CN103188837A

CN103188837A - Power circuit for light emitting diode (LED) illuminating lamp

Info

Publication number: CN103188837A
Application number: CN2011104598650A
Authority: CN
Inventors: 胡益锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2013-07-03

Abstract

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

Description

A kind of LED lighting lamp power circuit

Technical field

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

Background technology

Along with people's deep further to the understanding of energy-conserving and environment-protective theory, the encouragement of national policy, the application of led light source are just constantly promoted.The LED lamp mainly divides 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, existing LED illuminating lamp is all taked DC power supply circuit stably, and be 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, last Hypon power is general, Zhejiang is just safe, Wenzhou optically focused, Shenzhen Ge Limei, and the famous LED illumination in brand Philip, the world etc. enterprise, all at the LED light fixture that uses traditional DC circuit to drive, they produce with Ou Pusi, the positive safe outdoor high-power LED street lamp of representative that is, all be that the employing Switching Power Supply is drive circuit, and for low-power LED lamp (being no more than 15W), then be to be the bulb type of representative with the Philip, fluorescent lamp type household LED lamp, they have adopted traditional capacitance current-limiting full-bridge rectification formula DC power-supply circuit, She Ji LED lamp luminous intensity 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, 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.Experimental results show that: if temperature rise reaches 80 ° more than the C, 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).Therefore, at present the producer of all production high-power LED illuminations all rests on and how to dispel the heat and improve on the external power supply Study on Efficiency, all be to work hard in heat radiation, the LED lamp that they dispatch from the factory determines that high-powered LED lamp can only be slab design because the large volume aluminium heat sink is housed, and weight is not light, be example with the 130WLED of Ou Pu department flat lamp, 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 of 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 finished heat radiation.

Summary of the invention

The objective of the invention is to for overcome the deficiencies in the 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 achieving the above object, the technical solution that the present invention takes is as follows: a kind of LED lighting lamp power circuit is characterized in that: described power circuit is for being converted to civil power the change-over circuit of dc pulse moving voltage, and ripple frequency is at 100 to 200 hertz.

The invention has the beneficial effects as follows: because this LED lighting lamp power circuit is converted to dc pulse moving voltage with civil power, 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, prevented the fatigue phenomenon that LED causes because being in long-term continuous operation, 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.

The invention will be further described below in conjunction with the drawings and specific embodiments.

Description of drawings

Accompanying drawing 1 is specific embodiment of the invention schematic block circuit diagram;

Accompanying drawing 2 is another specific embodiment schematic block circuit diagram of the present invention;

Accompanying drawing 3 is 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.

Specific embodiment

The new LED lighting lamp power circuit of this practicality is the change-over circuit that civil power is converted to 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 the interchange 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 does not arrange filter capacitor, directly the output dc pulse moving voltage is the power supply of low-power LED illuminating lamp, the capacity of current limiting capacitance is determined according to the concrete power of LED illuminating lamp, is repeated no more herein.

For than high-power LED illuminating lamp (surpass 30W), as shown in Figure 2, described change-over circuit comprises switching power supply, electronic switching circuit and oscillating impulse generation circuit, the output of described switching power supply is connected with the electronic switching circuit input, the output of described 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, as the high power switch triode, described 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 by 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 described change-over circuit and provide power supply for many group LED illuminating lamps, 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: described power circuit is for being converted to civil power 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: described change-over circuit is for exchanging the full-bridge rectification formula dc pulse power supply circuits that side is serially connected with current limiting capacitance.

3. LED lighting lamp power circuit according to claim 1, it is characterized in that: described change-over circuit comprises switching power supply, electronic switching circuit and oscillating impulse generation circuit, the output of described switching power supply is connected with the electronic switching circuit input, the output of described 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 described change-over circuit and provide power supply for many group LED illuminating lamps.

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