CN103096564B - A kind of LED emergency luminaire and drive circuit thereof - Google Patents
A kind of LED emergency luminaire and drive circuit thereof Download PDFInfo
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- CN103096564B CN103096564B CN201110341412.8A CN201110341412A CN103096564B CN 103096564 B CN103096564 B CN 103096564B CN 201110341412 A CN201110341412 A CN 201110341412A CN 103096564 B CN103096564 B CN 103096564B
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Abstract
The invention discloses a kind of LED emergency luminaire and drive circuit thereof, described drive circuit comprises: electric main unit, DC standby power unit, switch control unit, constant current voltage limiting unit; Constant current voltage limiting unit input is connected with DC standby power unit and switch control unit, and output is connected with LED load; Switch control unit controls to start constant current voltage limiting unit after the power down of electric main unit, there is provided constant current by constant current voltage limiting unit for LED load by DC standby power unit, the impulse current produced when avoiding relay to change produces harmful effect to LED load.Constant current voltage limiting unit is connected between switch control unit and LED load, switch control unit is avoided directly to be connected with LED load, thus avoid the phenomenon that relay produces arcing and electric discharge, improve the useful life of relay, thus improve the reliability of LED emergency luminaire circuit.
Description
Technical field
The present invention relates to LED emergency light field, particularly relate to a kind of LED emergency luminaire and drive circuit thereof.
Background technology
Emergency light is a kind of very important lighting device, and when main power source normal power supply automatically to backup battery charging, the backup battery that automatically switches after main power source power down is powered, to provide emergency lighting.Be used widely in the place of the densely populated place such as skyscraper, teaching building, market and public place of entertainment.When it may be used for building breaking out of fire, safe escape, the content such as fire emergency and navigation direction of personnel, therefore play very important role, be even referred to as " lamp of life " in the life of people.And LED is owing to having that the life-span is long, energy consumption is low, color rendering is high, easy care, volume are little, speed of lighting is fast, without stroboscopic, luminous efficiency advantages of higher, be used widely in emergency light field.
At present, be switched to from main power source powered lighting that the process of emergency power supply illumination mainly realized by the interlock of relay and main power source, namely when main power source normal power supply, relay disconnection emergency power supply and emergency lighting load; When main power source power down, relay connects emergency power supply and emergency lighting load.Owing to there being the existence of emergency lighting load, easily making relay arcing when transfer contact, electric discharge, shorten the useful life of relay; And also can cause larger infringement to emergent lighting load at the impulse current of the moment generation of relay conversion, have impact on the reliability of emergency lighting circuit.
Summary of the invention
Technical problem to be solved by this invention is, a kind of drive circuit and LED emergency luminaire of LED emergency luminaire are provided, LED load is wherein connected with relay by constant current voltage limiting unit, thus arcing when relay contact can be avoided to change, electric discharge, and avoid producing impulse current in circuit, ensure emergency circuit constant current operation, improve the reliability of emergency circuit.
In order to solve the problems of the technologies described above, on the one hand, embodiments of the invention provide a kind of drive circuit of LED emergency luminaire, comprising: electric main unit, DC standby power unit, constant current voltage limiting unit, switch control unit; The input of described constant current voltage limiting unit is connected with described DC standby power unit, and output is connected with LED load; Described switch control unit is connected with described electric main unit and described constant current voltage limiting unit respectively, and control to start described constant current voltage limiting unit after the power down of described electric main unit, be that described LED load is powered by described DC standby power unit by described constant current voltage limiting unit.
Described constant current voltage limiting unit comprises constant current chip, fly-wheel diode, energy storage inductor; Described constant current chip comprises switch output pin (1), starts auxiliary foot (2), current feedback pin (5), job control pin (6), power supply input pin (8); The negative pole of described afterflow diode is connected to switch output pin (1), plus earth, and described energy storage inductor one end is connected to switch output pin (1), and the other end is connected to the anode of described LED load; Described DC standby power unit is connected to power supply input pin (8), described switch control unit is connected to job control pin (6), be connected with pull-up resistor R3 between described job control pin (6) and described power supply input pin (8), the negative electrode of described LED load is by sampling resistor R5 ground connection.
The RC filter circuit be made up of R4 and C6 is connected with between the negative electrode of described current feedback pin (5) and described LED load.
Described drive circuit also comprises storage capacitor C5, and the positive pole of described storage capacitor C5 is connected with the anode of described LED load, minus earth.
Described DC standby power unit comprises DC power supply, the storage capacitor C1 being connected in parallel on described DC power supply two ends respectively and filter capacitor C2.
Described switch control unit comprises Z-type relay, switch element, and described Z-type relay is connected with described switch element.
Described switch element is triode or metal-oxide-semiconductor field effect transistor.
The coil of described Z-type relay is connected with described electric main unit, moving contact is connected with described DC standby power unit by the first divider resistance R1, a fixed contact is connected with the base stage of triode or the grid of metal-oxide-semiconductor field effect transistor and passes through the second divider resistance R2 ground connection, and another fixed contact is unsettled.
Described constant current chip is LM3402 chip.
On the other hand, the present invention also provides a kind of LED emergency luminaire, the LED load comprising above-mentioned drive circuit and be connected with above-mentioned drive circuit.
Embodiment of the present invention tool has the following advantages or beneficial effect:
The drive circuit of LED emergency luminaire in the embodiment of the present invention, adopts switch control unit to control the operating state of constant current voltage limiting unit, and can direct the power supply for LED load with stand-by power supply of the operating state of constant current voltage limiting unit associate; LED load is not directly connected with switch control unit, and is connected by constant current voltage limiting unit, therefore, it is possible to the arcing produced due to the existence of LED load when avoiding relay contact to change and electric discharge phenomena, improves the useful life of relay.In addition, owing to have employed constant current voltage limiting unit, for LED load provides constant operation electric current, the impulse current produced when avoiding relay to change causes harmful effect to LED load, thus improves the reliability of emergency circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of drive circuit in the embodiment of the present invention;
Fig. 2 is the circuit structure diagram of drive circuit in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, it is the structured flowchart of the drive circuit of LED emergency luminaire in an embodiment of the present invention.Drive circuit comprises DC standby power unit 200, switch control unit 300, constant current voltage limiting unit 400.The input of wherein said constant current voltage limiting unit 400 is connected with described DC standby power unit 200, output is connected with LED load 500, for the electricity in stand-by power supply is outputted to LED load 500 with the form of constant current, thus the impulse current produced when emergency circuit starts can be avoided to cause harmful effect to LED load 500, and ensure that the brightness of LED load 500 there will not be excessive fluctuation.This drive circuit realizes the monitoring to electric main unit 100 by connecting valve control unit 300 and electric main unit 100.Switch control unit 300 is connected with the working state control end of constant current voltage limiting unit 400, when 100 power down of electric main unit, switch control unit 300 starts constant current voltage limiting unit 400 by control signal, constant current voltage limiting unit 400 is normally worked, thus driving comprises DC standby power unit 200, the emergency circuit that constant current voltage limiting unit 400 and LED load 500 are connected to form successively, thus make LED emergency luminaire enter emergency lighting state, avoid switch control unit 300 to be directly connected with LED load 500, thus avoid, in transfer process, damage is caused to the relay of switch control unit 300, improve the useful life of relay.
In one embodiment, during electric main unit 100 normal power supply, switch control unit 300 forms low level signal by the working state control end at constant current voltage limiting unit 400, thus makes constant current voltage limiting unit 400 be in closed condition; When 100 power down of electric main unit, switch control unit 300 forms high level signal by the working state control end at constant current voltage limiting unit 400, thus startup constant current voltage limiting unit 400 works, and enters emergency lighting state.
By adopting constant current voltage limiting unit 400 that relay can be avoided directly to be connected with LED load 500, thus avoiding relay to produce the phenomenon of arcing electric discharge, improve the useful life of relay; In addition, under constant current voltage limiting unit 400 can make LED load 500 be operated in a constant current, the impulse current produced in relay contact transfer process is avoided to cause harmful effect to LED load 500.
Please refer to Fig. 2, be wherein depicted as a kind of physical circuit building-block of logic of drive circuit of the present invention.Wherein switch control unit 300 comprises a Z-type relay K 1 and a switch element, and this switch element comprises triode and metal-oxide-semiconductor field effect transistor in one embodiment.Below for this switch element for triode Q1 is described switch control unit 300, when adopting metal-oxide-semiconductor field effect transistor, its grid corresponds to the base stage of triode Q1, drain electrode corresponds to the collector electrode of triode Q1, source electrode corresponds to triode Q1 emitter.Wherein the coil of Z-type relay K 1 is connected with electric main unit 100, moving contact is connected with DC standby power unit 200 by the first divider resistance R1, a fixed contact is connected with the base stage of triode Q1 and passes through the second divider resistance R2 ground connection, and another fixed contact is unsettled.The grounded emitter of triode Q1 in addition, collector electrode is connected to the job control pin 6 (please refer to hereinafter about the introduction of each pin of constant current chip) of constant current chip.
Constant current voltage limiting unit 400 comprises constant current chip, afterflow diode D1, energy storage inductor L1.This constant current chip comprises switch output pin 1, starts auxiliary foot 2, brightness adjustment control pin 3, GND pin 4, current feedback pin 5, job control pin 6, internal electric source output pin 7, power supply input pin 8; Sustained diode 1 negative pole is connected to switch output pin 1, plus earth, the anode that energy storage inductor L1 one end is connected to switch output pin 1, the other end is connected to LED load 500.Afterflow diode D1 uses together with energy storage inductor L1 can prevent electric current and voltage jump, for LED load 500 provides protection.In a kind of preferred embodiment, also comprise a storage capacitor C5, the positive pole of C5 is connected to anode, the minus earth of LED load 500, adopts multiple energy storage device can more effectively prevent current/voltage from suddenling change, for emergency light provides protection.
The job control pin 6 of constant current chip is connected with the collector electrode of triode Q1, and is connected to DC standby power unit 200 by pull-up resistor R3.In addition, DC standby power unit 200 is connected with the power supply input pin 8 of constant current chip.The switch output pin 1 of constant current chip is connected with startup auxiliary foot 2 by electric capacity C3.Brightness adjustment control pin 3 is unsettled in the present embodiment, GND pin 4 ground connection, and internal electric source output pin 7 is by ceramic disc capacitor C4 ground connection.Current feedback pin 5 place is provided with the filtering RC circuit be made up of electric capacity C6 and resistance R4, and the other end of this filter circuit is connected to the negative electrode of LED load 500, and by sampling resistor R5 ground connection.
In one embodiment, constant current chip adopts LM3402 chip.The operation principle of this constant current chip is integrated MOS pipe between switch output pin 1 and power supply input pin 8, and automatically adjusts the duty ratio of inner MOS switch according to the pressure drop on sampling resistor R5.In one-period, when metal-oxide-semiconductor conducting, whole current circuit is open-minded, and LED load 500 is lit, and energy storage inductor and storage capacitor storage power; When metal-oxide-semiconductor ends, current circuit disconnects, and the electricity that LED load 500 relies on energy-storage travelling wave tube to provide works on, until next cycle metal-oxide-semiconductor is open-minded, thus reaches constant current object.As long as determine the value of sampling resistor R5, output current just determines.This is because, sampling pin 5 and and the reference voltage source of constant current chip inside form a comparator, the contrast according to the voltage sampled and reference voltage adjusts the duty ratio controlling metal-oxide-semiconductor pulse automatically.Particularly, when sampled voltage is greater than reference voltage, when namely output current is greater than set point, reduces the duty ratio of metal-oxide-semiconductor pulse, output current is reduced to set point; When sampled voltage is less than reference voltage, when namely output current is less than set point, improves the duty ratio of metal-oxide-semiconductor pulse, output current is increased to set point.
In addition, DC standby power unit 200 comprises DC power supply, storage capacitor C1, filter capacitor C2, and storage capacitor C1 and filter capacitor C2 is connected in parallel on the two ends of DC power supply to ensure its stability of powering.
It should be noted that, on the basis of this circuit logic structure chart, the circuit logic structure chart adopting other identical components and parts of function to replace corresponding device in this circuit logic structure chart also belongs to protection scope of the present invention.
Now provide the parameter of each components and parts shown in a set of Fig. 2 for the ease of enforcement of the present invention, but these parameters can not as limitation of the present invention, other parameters that can realize said function also should be included in protection scope of the present invention.The resistance of the first divider resistance R1 is 10K ohm, and the resistance of the second divider resistance R2 is 2K ohm, and the resistance of pull-up resistor R3 is 200K ohm, and the resistance of sampling resistor R4 is 2K ohm, and the resistance of sampling resistor R5 is 0.6 ohm; The capacitance of filter capacitor C2 is 0.1uF, and the capacitance of ceramic disc capacitor C4 is 0.1uF, and the capacitance of electric capacity C3 is 0.1nF, and the electric capacity of filter capacitor C6 is 1nF; The specification of energy storage inductor L1 is 22uH/1A, and the specification of storage capacitor C5 is 4.7uF/25V.
Brief description is carried out to the process adopting the drive circuit in the embodiment of the present invention to carry out emergency lighting below.When electric main unit 100 normal power supply, the moving contact 1 of relay K 1 contacts with fixed contact 3, DC power supply provides high level voltage by divider resistance R1, R2 to the base stage of triode Q1, triode Q1 conducting, its collector electrode exports as low level, namely the job control pin 6 of constant current chip is low level, and therefore constant current chip turns off.When electric main power down, the moving contact 1 of relay K 1 contacts with fixed contact 2, triode Q1 base stage is low level, triode Q1 turns off, its collector electrode exports as high level, and namely constant current chip job control pin 6 is high level, and constant current chip starts, stand-by power supply is by constant current chip for LED load 500 provides power supply, and circuit enters emergency lighting state.
Present invention also offers a kind of LED emergency luminaire, it LED load 500 comprising above-mentioned drive circuit and be connected with above-mentioned drive circuit on the other hand.
Adopt switch control unit to control the operating state of constant current voltage limiting unit for the drive circuit of LED emergency luminaire in the embodiment of the present invention, and can the operating state determination stand-by power supply of constant current voltage limiting unit power for LED load; LED load is not directly connected with switch control unit, and is connected by constant current voltage limiting unit, therefore, it is possible to the arcing produced due to the existence of LED load when avoiding relay contact to change and electric discharge phenomena, improves the useful life of relay.In addition, owing to have employed constant current voltage limiting unit, make LED load be operated in the state of constant current voltage limiting, the impulse current produced when avoiding relay conversion on the impact of LED load, thus improves the reliability of emergency circuit.On the other hand, during afterflow diode and energy storage are set in circuit, ensure that LED load is operated in constant electric current further, thus make its in the course of the work brightness do not have too large change.
LED emergency luminaire in the embodiment of the present invention and drive circuit thereof are applied in the emergent places such as cabin staircase, passageway, rest room, reliably can link with main circuit, after main circuit power down, start emergency lighting in time.
Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying performing creative labour, are namely appreciated that and implement.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (7)
1. a drive circuit for LED emergency luminaire, is characterized in that, comprising: electric main unit, DC standby power unit, constant current voltage limiting unit, switch control unit; The input of described constant current voltage limiting unit is connected with described DC standby power unit, and output is connected with LED load; Described switch control unit is connected with described electric main unit and described constant current voltage limiting unit respectively, and control to start described constant current voltage limiting unit after the power down of described electric main unit, be that described LED load is powered by described DC standby power unit by described constant current voltage limiting unit;
Described switch control unit comprises Z-type relay, switch element, and described Z-type relay is connected with described switch element, and described switch element is triode or metal-oxide-semiconductor field effect transistor;
When described switch element is described triode, the coil of described Z-type relay is connected with described electric main unit, moving contact is connected with described DC standby power unit by the first divider resistance R1, a fixed contact is connected with the base stage of described triode and passes through the second divider resistance R2 ground connection, and another fixed contact is unsettled; The grounded emitter of described triode; The collector electrode of described triode is connected with the control pin of constant current voltage limiting unit, simultaneously the collector electrode of described triode be also connected with described DC standby power unit by pull-up resistor;
When described switch element is described metal-oxide-semiconductor field effect transistor, the coil of described Z-type relay is connected with described electric main unit, moving contact is connected with described DC standby power unit by the first divider resistance R1, a fixed contact is connected with the grid of described metal-oxide-semiconductor field effect transistor and passes through the second divider resistance R2 ground connection, and another fixed contact is unsettled; The source ground of described metal-oxide-semiconductor field effect transistor; The drain electrode of described metal-oxide-semiconductor field effect transistor is connected with the control pin of constant current voltage limiting unit, the drain electrode of described metal-oxide-semiconductor field effect transistor simultaneously is also connected with described DC standby power unit by pull-up resistor.
2. the drive circuit of LED emergency luminaire as claimed in claim 1, it is characterized in that, described constant current voltage limiting unit comprises constant current chip, fly-wheel diode, energy storage inductor; Described constant current chip comprises switch output pin (1), starts auxiliary foot (2), current feedback pin (5), job control pin (6), power supply input pin (8); The negative pole of described afterflow diode is connected to switch output pin (1), plus earth, and described energy storage inductor one end is connected to switch output pin (1), and the other end is connected to the anode of described LED load; Described DC standby power unit is connected to power supply input pin (8), described switch control unit is connected to job control pin (6), be connected with pull-up resistor R3 between described job control pin (6) and described power supply input pin (8), the negative electrode of described LED load is by sampling resistor R5 ground connection.
3. the drive circuit of LED emergency luminaire as claimed in claim 2, is characterized in that, between the negative electrode of described current feedback pin (5) and described LED load, be connected with the RC filter circuit be made up of R4 and C6.
4. the drive circuit of LED emergency luminaire as claimed in claim 2, it is characterized in that, also comprise storage capacitor C5, the positive pole of described storage capacitor C5 is connected with the anode of described LED load, minus earth.
5. the drive circuit of LED emergency luminaire as claimed in claim 1, it is characterized in that, described DC standby power unit comprises DC power supply, the storage capacitor C1 being connected in parallel on described DC power supply two ends respectively and filter capacitor C2.
6. the drive circuit of the LED emergency luminaire as described in as arbitrary in claim 1-5, it is characterized in that, described constant current chip is LM3402 chip.
7. a LED emergency luminaire, is characterized in that, comprise drive circuit according to any one of claim 1-6 and with as described in drive circuit be connected as described in LED load.
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| CN201110341412.8A CN103096564B (en) | 2011-11-02 | 2011-11-02 | A kind of LED emergency luminaire and drive circuit thereof |
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| CN201110341412.8A CN103096564B (en) | 2011-11-02 | 2011-11-02 | A kind of LED emergency luminaire and drive circuit thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104684153B (en) * | 2013-11-28 | 2019-01-29 | 深圳市海洋王照明工程有限公司 | Emergency lighting lamp control circuit and lamps and lanterns |
| CN104333953B (en) * | 2014-10-16 | 2017-04-26 | 刘胜泉 | Intelligent lamp circuit |
| CN106231746B (en) * | 2016-07-26 | 2018-05-18 | 合肥联信电源有限公司 | A kind of emergency lighting distributes electric control circuit |
| CN107979899A (en) * | 2017-12-27 | 2018-05-01 | 苏州菲达旭微电子有限公司 | A kind of linear general pump feeds constant-current circuit and has its LED light |
| CN109640479A (en) * | 2018-12-18 | 2019-04-16 | 苏州科思尼克照明科技有限公司 | A kind of lighting device of and constant power output emergency driving |
| CN109874200B (en) * | 2019-03-13 | 2021-11-02 | 广州纽威光电科技有限公司 | Multi-mode LED lamp for automobile |
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| JP2008166165A (en) * | 2006-12-28 | 2008-07-17 | Toshiba Lighting & Technology Corp | Lighting device |
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| CN2543319Y (en) * | 2002-04-19 | 2003-04-02 | 广州市番禹区胜捷消防设备有限公司 | Domestic emergency illuminating lamp device |
| CN101932153B (en) * | 2009-06-24 | 2012-12-26 | 海洋王照明科技股份有限公司 | LED emergency light circuit supplied by wide voltage power supply |
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