CN101977468B

CN101977468B - Power supply module for high-power light-emitting diode (LED) lamp

Info

Publication number: CN101977468B
Application number: CN2010105404588A
Authority: CN
Inventors: 罗耀光
Original assignee: HUNAN HULIANAN HIGH-TECH ENERGY-SAVING ENGINEERING Co Ltd
Current assignee: HUNAN HULIANAN HIGH-TECH ENERGY-SAVING ENGINEERING Co Ltd
Priority date: 2010-11-11
Filing date: 2010-11-11
Publication date: 2013-03-13
Anticipated expiration: 2030-11-11
Also published as: CN102917507B; CN101977468A; CN102917507A; CN102917506A; CN102917506B

Abstract

The invention relates to a power supply module for a high-power light-emitting diode (LED) lamp. The module comprises an alternating current power supply, a plurality of alternating current-direct current power modules and a plurality of high-power LED strings, wherein the alternating current input ends of all alternating current-direct current power modules are connected to the port of an alternating current voltage source; a ground wire at an alternating current input end and a ground wire at a module power supply output end are directly connected with a lamp shell; and the direct current output end of each module power supply is connected with one high-power LED string respectively. Respective independent alternating current-direct current power module supplies power to each LED string respectively, so that the reliability of the high-power LED lamp is enhanced greatly and the service life of the high-power LED lamp is prolonged greatly.

Description

A kind of high-power LED lamp supply module

Technical field

The present invention relates to a kind of LED light fixture, say more specifically a kind of high-power LED lamp supply module.

Background technology

At present, based on the develop rapidly of modern semiconductor technology, high-power LED lamp is widely used at commercial and industrial circle in recent years.Utilizing high power LED light fixture in illuminator, its major advantage are can be in its greatly energy-saving and emission-reduction of whole life period, and this will have far-reaching impact to the economic long-run development of China.If use properly, high-power illumination equipment is more much longer than traditional high pressure sodium lamp life-span.But because high-powered LED lamp is semiconductor device, if design or improper use also will cause device to damage too early, cause unnecessary communal facility service disruption.The initial outlay price of LED light fixture still is higher than traditional light fixture far away at present, and the purpose that reach the energy-saving and emission-reduction of LED light fixture just must increase the reliability of LED illuminator.

Even state-of-the-art single led lamp also only provides the seldom lumen degree of amount.Reach the illumination same with the conventional high-tension sodium vapor lamp such as need, numerous LED must be used together.The method of a plurality of LED fluorescent tubes of traditional connection generally comprises being connected in series as shown in Figure 1, connection in series-parallel as shown in Figures 2 and 3 connects.Being connected in series a large amount of great power LED pipes often is infeasible to reach with the same illumination of conventional high-tension sodium vapor lamp in actual applications, there are two problems in this series system, one: power supply or led driver need very high VD, this can increase difficult design for satisfying the safety standard, simultaneously field service is produced unnecessary trouble.Its two: cause open circuit if in a string LED, there is LED to damage, just whole light fixture can extinguish.

Parallel connection or connection in series-parallel also exist other shortcomings.Because the great power LED pipe needs constant current operation, LED tube short circuit or open failure can cause electric current to redistribute in each branch of every other parallel connection and series connection.Electric current can increase more at high current branch, the result causes the light fixture local temperature to raise, and causes that successively electric current is more uneven, so that the local temperature continuation is risen, final, a LED pipe damages and can cause part or whole LED pipe electricity to damage or cause thermal damage.The situation that this damage mechanism damages than above the first is more serious.

Summary of the invention

The object of the invention is to overcome the deficiency in the prior art, the high-power LED lamp supply module of a kind of high efficiency, high reliability is provided.

In order to solve the problems of the technologies described above, the present invention adopts following technical proposals: comprise AC power, a plurality of AC-DC modular power source and great power LED string, the ac input end of all AC-DC modular power sources is also received on the port of alternating-current voltage source, the ground wire of ac input end is connected ground wire and directly is connected with lamp outer casing with the modular power source output, the dc output end of each modular power source connects with a great power LED series winding respectively, is connected with electronic timer and switch between described ac power input end and the AC-DC modular power source; Described AC-DC modular power source is not for the AC-DC modular power source of power factor compensation, describedly do not comprise electromagnetic interface filter with the AC-DC modular power source of power factor compensation, full-wave rectifier, isolated DC-DC converter, the great power LED array, the energy storage module, former limit control module, isolation module and secondary control module, described electromagnetic interface filter, full-wave rectifier, isolated DC-DC converter is connected with the great power LED array and is connected, the energy storage module is connected between full-wave rectifier and the isolated DC-DC converter, the output of secondary control module, isolation module be connected the input of limit control module and connect successively, the input of secondary control module is connected with the dc output end of isolated DC-DC converter, and the output of former limit control module is connected with isolated DC-DC converter.

Owing to adopt technique scheme, the invention has the beneficial effects as follows: several are identical but have separate AC-DC power supply module to connect with the LED that is connected in series with some numbers series winding respectively, the corresponding a string LED string of each AC-DC power supply module, can both high efficiencyly operate so that every string LED goes here and there, and in the situation of turning off a modular power source, do not affect the as usual running of other modular power source; And between ac power input end and N piece AC-DC power supply module, also be connected with electronic timer and switch, can within the predefined time, turn-off certain a part of power supply of light fixture, reach energy-conservation effect.

Description of drawings

Fig. 1 is the structural representation that traditional high-power LED lamp supply module series system connects.

Fig. 2 is the structural representation that traditional high-power LED lamp supply module series-parallel system connects.

Fig. 3 is the structural representation that traditional another kind of series-parallel system of high-power LED lamp supply module connects.

Fig. 4 is structural representation of the present invention.

Fig. 5 is with the high-power LED lamp supply module structural representation of darkening among the present invention.

Fig. 6 is not with the typical AC-DC power supply block diagram of power factor compensation among the present invention.

Fig. 7 be among the present invention band with the typical AC-DC power supply block diagram of power factor compensation.

Fig. 8 is with the single-stage AC-DC power supply block diagram of power factor compensation among the present invention.

Embodiment

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:

As shown in Figure 4, be a kind of structural representation of high-power LED lamp supply module among the present invention, it indicates with system 400.It by some identical but independently the AC-DC power supply module form, be denoted as respectively 401,402,403 ... etc..The quantity of modular power source can increase and can subtract according to designing requirement in the light fixture, and the ac input end of each modular power source all is parallel-connected on the port of alternating-current voltage source.The ground wire of ac input end and modular power source (401,402,403 ... etc.) ground wire of output directly is connected to satisfy security regulations with lamp outer casing.The output of each modular power source is direct current output, and it only connects with a LED series winding, so the driving of each LED string has the current circuit of oneself, only just is connected with ground at each modular power source negative terminal equipped at outlet port.410,411,412 ... etc. all be identical great power LED string, the quantity of every string LED pipe can be different from the heat dissipation equipment maximum permissible value according to illuminance, light fixture Machine Design.Although the pipe of the LED in every whole string is all connected, it is flexibility and changeability that the internal electric of in fact every substring LED connects, and it is even to realize like this reaching approximate illumination when darkening is moved in different applications.Because each great power LED string is drive, the contingent phenomenon that finally can cause light fixture to damage because of forward voltage and current characteristics mismatch can not occur in native system between each LED string.At arbitrary LED wick, or in the situation of arbitrary modular power source damage, light fixture still can continue operation, and can not extinguish fully.

As shown in Figure 5, realize the structural representation of high-power LED lamp supply module darkening for a kind of straightforward procedure.Compared to Figure 1, Fig. 2 has only increased a timer 1001 and a switch S.In this example, switch S is connected to the ac input end of modular power source 2.Its effect is under the control of timer 1001, according to presetting, turn-offs a part of power supply of light fixture.Owing to be mutually independently between each modular power source and other modular power sources in the light fixture, and the design of modular power source under given LED load with the peak efficiency running, do not affect other modular power sources and as usual operate so turn off a modular power source.The present invention can realize the light fixture darkening easily, reaches energy-conservation effect, and the running of whole light fixture still can keep needed power supply conversion efficiency and power factor.

As shown in Figure 6, for the typical case not with the functional-block diagram of the power supply 500 of power factor compensation.It is represented by Electricity Functional square frame 501-508 respectively: 501 are electromagnetic interface filter, can effectively suppress High-frequency Interference in the AC network to the impact of equipment, 502 is full-wave rectifier, to become direct current by the AC rectification of filtering, the 503rd, isolated DC-DC converter, direct current is become another fixed voltage, the direct current of constant current, for great power LED provides stable constant voltage, the constant current direct current, 504 is the great power LED array, a plurality of LED luminous tubes are connected in series, form one group of light emitting module, 505 is the secondary control module, is responsible for the control of synchronous rectification, 506 is isolation module, be used for signal isolation and anti-interference, 507 is former limit control module, and it utilizes former limit feedback operation principle, to guarantee galvanic constant voltage, constant current accuracy, 508 is large capacity storage capacitor, and the current capacity of stabilizing is arranged, and plays peak clipping, fill out the effect of paddy.Based on the operation principle of full-wave rectifier 502 to large capacity storage capacitor 508, the electric current of ac input end comprises first-harmonic and a large amount of high order harmonic components.Wherein only have fundametal compoment to participate in exchanging the Energy Transfer that is input to dc output end, and the existence of high order harmonic component increases the effective value of power supply input current.This electric current can cause unnecessary power loss in the ac power supply system, so for the LED light fixture, the input power of this reactive factor offset supply of standard code is limited to below 25 W, to reach the purpose that reduces transmission line harmonic pollution and distribution system energy loss.

As shown in Figure 7, be the functional-block diagram of typical case with the power supply 600 of power factor compensation.It is represented by Electricity Functional square frame 601-608 respectively: 601 are electromagnetic interface filter, can effectively suppress High-frequency Interference in the AC network to the impact of equipment, 602A is full-wave rectifier, to become direct current by the AC rectification of filtering, 602B is power factor compensation (Boost) converter that boosts, effective harmonic carcellation source, 603 is isolated DC-DC converter, direct current is become another fixed voltage, the direct current of constant current is for great power LED provides stable constant voltage, the constant current direct current, 604 is the great power LED array, a plurality of LED luminous tubes are connected in series, form one group of light emitting module, 605 is the secondary control module, is responsible for the control of synchronous rectification, 606 is isolation module, be used for signal isolation and anti-interference, 607 is former limit control module, and it utilizes former limit feedback operation principle, to guarantee galvanic constant voltage, constant current accuracy, 608 is large capacity storage capacitor, and the current capacity of stabilizing is arranged, and plays peak clipping, fill out the effect of paddy.Compare with the power supply 500 among Fig. 6, increased an extra power factor compensation converter 602B, to satisfy the standard code requirement.Power-factor compensator 602B generally is boost converter, but voltage-dropping type or buck-boost type also can be used for this purpose.The input of booster converter is the sine wave through full-wave rectification, and its output is the high voltage direct current output with 608 stored energys.The isolated A.C.-D.C. converter of subordinate is supplied with in the output of booster converter, and it forms by 603,605,606 and 607.The circuit types of isolated interchange one DC converter is preferably decided according to the inverter power size requirements.The general power of typical LED lighting only is 25 W-100 W, and behind the increase one-level PFC circuit, the cost of power supply will improve a lot.

As shown in Figure 8, be single-stage AC-DC power supply 700 functional-block diagrams with power factor compensation.701 is electromagnetic interface filter, can effectively suppress High-frequency Interference in the AC network to the impact of equipment, 702 is full-wave rectifier, to become direct current by the AC rectification of filtering, 703 is power factor compensation and isolated DC-DC converter, direct current is become another fixed voltage, the direct current of constant current, for great power LED provides stable constant voltage, the constant current direct current, and effective harmonic carcellation source, 704 is the great power LED array, a plurality of LED luminous tubes are connected in series, form one group of light emitting module, 705 is the secondary control module, is responsible for the control of synchronous rectification, and 706 is isolation module, be used for signal isolation and anti-interference, 707 is former limit control module, and the current capacity of stabilizing is arranged, and plays peak clipping, fill out the effect of paddy.Power supply 700 exchanges 602B among Fig. 6 one DC converter 603 and is integrated with isolation among Fig. 8.This power supply does not have energy storage level 608 among Fig. 6, and its optimum output power scope is about 25 W-80 W.This design performance cost ratio that can offer the best can satisfy the specification requirement of most of LED light fixtures.

Claims

1. high-power LED lamp supply module, it is characterized in that: comprise AC power, a plurality of AC-DC modular power source and great power LED string, the ac input end of all AC-DC modular power sources is also received on the port of alternating-current voltage source, the ground wire of ac input end is connected ground wire and directly is connected with lamp outer casing with the modular power source output, the dc output end of each modular power source connects with a great power LED series winding respectively, is connected with electronic timer and switch between described ac power input end and the AC-DC modular power source; Described AC-DC modular power source is not for the AC-DC modular power source of power factor compensation, describedly do not comprise electromagnetic interface filter with the AC-DC modular power source of power factor compensation, full-wave rectifier, isolated DC-DC converter, the great power LED array, the energy storage module, former limit control module, isolation module and secondary control module, described electromagnetic interface filter, full-wave rectifier, isolated DC-DC converter is connected with the great power LED array and is connected, the energy storage module is connected between full-wave rectifier and the isolated DC-DC converter, the output of secondary control module, isolation module be connected the input of limit control module and connect successively, the input of secondary control module is connected with the dc output end of isolated DC-DC converter, and the output of former limit control module is connected with isolated DC-DC converter.