CN103298222A - Light-emitting diode (LED) multi-channel current-sharing circuit - Google Patents
Light-emitting diode (LED) multi-channel current-sharing circuit Download PDFInfo
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- CN103298222A CN103298222A CN2013102753345A CN201310275334A CN103298222A CN 103298222 A CN103298222 A CN 103298222A CN 2013102753345 A CN2013102753345 A CN 2013102753345A CN 201310275334 A CN201310275334 A CN 201310275334A CN 103298222 A CN103298222 A CN 103298222A
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Abstract
The invention relates to an LED multi-channel current-sharing circuit. The LED multi-channel current-sharing circuit comprises an LED circuit formed by parallel connection of LED1-LEDn with direct current provided by a constant current power supply, the LED1-LEDn in the LED circuit are connected with triodes Q1-Qn and resistors R1-Rn in series respectively, a resistor Rovp is connected between the LED1 and the triode R1 in series, bases of the triodes Q1-Qn are in short connection with the collector of the triode Q1, the error accuracy of the current of each LED is controlled through adjusting sizes of the Rovp and the resistors R1-Rn, and resistances of the resistors R1-Rn are equal. According to the LED multi-channel current-sharing circuit, peripheral devices are few, an IC is not needed, the circuit is simple and easy to control, the cost is low, and the current-sharing control accuracy is high; and the amount of power output control lines is reduced, and the circuit and LEDs can be integrated onto a lamp panel.
Description
Technical field
The present invention relates to the multichannel flow equalizing circuit of a kind of LED of being applied to, particularly a kind of LED electric current flow equalizing circuit.
Background technology
The LED lamp is fluorescent lamp as an alternative, and in commercial lighting, office lighting uses popularity, and work brings great convenience to daily life.LED lamp one big characteristics are directly to power with civil power, therefore the LED lamp will just need provide corresponding power drives as illuminating lamp, second in order to ensure designing high efficiency, output current is the LED lamp driving power source stably, now on the market can LED be designed to many all series connection or multichannel string and circuit modes.The advantage of series system is entirely, and the single channel Current Control is simple, and shortcoming is to be subjected to LED series connection number affects, and the power supply design limitations is big, and the power source design of different product wattage can be different fully, significantly increase the product certification expense.Multichannel string mode also can effectively address the above problem, and its advantage is exactly that the string number of regulating parallel connection LED obtains the product of different capacity by control series LED quantity, and what will make like this only is the size that changes electric power outputting current.Shortcoming is to guarantee that the size of current on every string LED is consistent, because the difference of the heat radiation of every LEDs, forward conduction voltage, meeting directly influence the life-span that goes out optical property and LED itself of LED.Usually the method for using current-limiting resistance or multiple constant current control IC is controlled the size of every road electric current.Current-limiting resistance is to seal in resistance in every paths of LEDs, though method is simple, components and parts are few, and constant current accuracy is poor, and needs the increasing resistance to promote constant current accuracy, and resistance more high resistance loss is more big, and power-efficient is more low.The advantage of multiple constant current IC is, the control precision height, and the efficient height, modulability is good, and shortcoming is that peripheral components is many, complex circuit, volume is big, cost is high.
Summary of the invention
Purpose of the present invention for overcome after the existing LED combination in parallel can't sharing control shortcoming, provide a kind of peripheral components few, circuit is simple, and is with low cost, the LED multichannel flow equalizing circuit that the Current Control precision is high.
For achieving the above object, technical scheme of the present invention is: a kind of LED multichannel flow equalizing circuit, comprise by constant-current supply galvanic many led circuits that LED 1 ~ LEDn composes in parallel are provided, it is characterized in that: be connected in series triode Q1 ~ Qn and resistance R 1 ~ Rn respectively in the LED 1 ~ LEDn parallel connection in the described led circuit, series resistor Rovp between described LED 1 and triode Q1 wherein, the collector electrode of the base stage of described triode Q1 ~ Qn and triode Q1 is short to be connected, by regulating the error precision that resistance R ovp and resistance R 1 ~ Rn resistance are controlled the electric current on every paths of LEDs.The resistance of resistance R 1 ~ Rn is equal,
The invention has the beneficial effects as follows: LED multichannel current-sharing led circuit peripheral components provided by the present invention is few, need not IC, and circuit is simple, and is easy to control, with low cost, electric current current sharing control accuracy height.Reduce the quantity of power supply output control line, and can be integrated on the lamp plate with LED.
Description of drawings
Fig. 1 is LED flow equalizing circuit schematic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, LED flow equalizing circuit of the present invention, give LED 1 ~ LEDn power supply by direct current, it is lighted, pass through triode Q1 ~ Qn and resistance R 1 ~ Rn then respectively, between LED 1 and triode Q1, seal in resistance R ovp, the base stage of triode Q1 ~ Qn is all linked up with the collector electrode weak point of described triode Q1.
Operation principle of the present invention: because, after electric current flows through LED 1 ~ LEDn respectively, can enter triode Q1 ~ Qn, because the base stage of triode Q1 ~ Qn all connects with the collector electrode of triode Q1 is short, make the base voltage of triode Q1 ~ Qn equal the collector voltage of triode Q1, so described triode Q1 ~ Qn is operated in the amplification region.And the electric current of the LED 1 ~ LEDn that flows through respectively all is subjected to flowing into the size of current control of triode Q1 base stage.After LEDn one road electric current among LED 1 ~ LEDn increases, voltage on resistance R n then can increase so, the voltage difference of triode Qn base stage and emitter is reduced, will limit the electric current that flows through on the triode Qn, the electric current that flows through accordingly on the LEDn also can be limited to reduce; Otherwise, if LEDn one road electric current reduces among LED 1 ~ LEDn, the voltage on resistance R n then can reduce so, and the voltage difference of triode Qn base stage and emitter is increased, will increase the electric current that flows through on the triode Qn, the electric current that flows through accordingly on the LEDn also can increase.If the voltage of LED 1 is too small, the base voltage of triode Q1 is too high, can compensate the voltage difference of LED 1 and other LED so by the resistance that increases resistance R ovp.Played the effect of controlling the electric current current-sharing of every road.
Because the voltage difference of triode Q1 ~ Qn base stage and emitter is subjected to the influence of resistance R 1 ~ Rn, so the resistance of resistance R 1 ~ Rn will equate that the increasing resistance can improve the current-sharing precision, and triode Q1 ~ Qn also wants the same.This circuit is suitable among the parallel connection LED circuit of DC power supply.
Claims (2)
1. LED multichannel flow equalizing circuit, comprise by constant-current supply galvanic many led circuits that LED 1 ~ LEDn composes in parallel are provided, it is characterized in that: be connected in series triode Q1 ~ Qn and resistance R 1 ~ Rn respectively in the LED 1 ~ LEDn parallel connection in the described led circuit, series resistor Rovp between described LED 1 and triode Q1 wherein, the collector electrode of the base stage of described triode Q1 ~ Qn and triode Q1 is short to be connected, by regulating the error precision that resistance R ovp and resistance R 1 ~ Rn resistance are controlled the electric current on every paths of LEDs.
2. LED multichannel flow equalizing circuit according to claim 1 is characterized in that: the resistance of described resistance R 1 ~ Rn equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102753345A CN103298222A (en) | 2013-07-03 | 2013-07-03 | Light-emitting diode (LED) multi-channel current-sharing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102753345A CN103298222A (en) | 2013-07-03 | 2013-07-03 | Light-emitting diode (LED) multi-channel current-sharing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103298222A true CN103298222A (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102753345A Pending CN103298222A (en) | 2013-07-03 | 2013-07-03 | Light-emitting diode (LED) multi-channel current-sharing circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103415112A (en) * | 2013-08-09 | 2013-11-27 | 杭州宇中高虹照明电器有限公司 | LED multi-path current sharing circuit |
| CN109804327A (en) * | 2017-04-19 | 2019-05-24 | 深圳市大疆创新科技有限公司 | Voltage regulator circuit and power supply circuit, remote controler with the voltage regulator circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201388310Y (en) * | 2008-12-30 | 2010-01-20 | 深圳市中联数源电子有限公司 | LED constant current drive circuit |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| KR20120004852U (en) * | 2010-12-24 | 2012-07-04 | 리 웬 마오 | Array constant-current multi-driving circuit |
-
2013
- 2013-07-03 CN CN2013102753345A patent/CN103298222A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201388310Y (en) * | 2008-12-30 | 2010-01-20 | 深圳市中联数源电子有限公司 | LED constant current drive circuit |
| KR20120004852U (en) * | 2010-12-24 | 2012-07-04 | 리 웬 마오 | Array constant-current multi-driving circuit |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
Non-Patent Citations (1)
| Title |
|---|
| 江磊等: "一种新的发光二极管多路均流电路设计", 《光源与照明》, 30 June 2013 (2013-06-30), pages 16 - 20 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103415112A (en) * | 2013-08-09 | 2013-11-27 | 杭州宇中高虹照明电器有限公司 | LED multi-path current sharing circuit |
| CN109804327A (en) * | 2017-04-19 | 2019-05-24 | 深圳市大疆创新科技有限公司 | Voltage regulator circuit and power supply circuit, remote controler with the voltage regulator circuit |
| CN109804327B (en) * | 2017-04-19 | 2021-05-04 | 深圳市大疆创新科技有限公司 | Voltage stabilizing circuit, power supply circuit with same and remote controller |
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Application publication date: 20130911 |