CN103415112A - LED multi-path current sharing circuit - Google Patents
LED multi-path current sharing circuit Download PDFInfo
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- CN103415112A CN103415112A CN2013103451465A CN201310345146A CN103415112A CN 103415112 A CN103415112 A CN 103415112A CN 2013103451465 A CN2013103451465 A CN 2013103451465A CN 201310345146 A CN201310345146 A CN 201310345146A CN 103415112 A CN103415112 A CN 103415112A
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Abstract
The invention relates to an LED multi-path current sharing circuit which aims to have the advantages of being few in external component, simple in circuit, low in cost and high in current control precision. According to the technical scheme, the LED multi-path current sharing circuit is characterized in that the circuit comprises a constant current power supply supplying direct currents and a plurality of LED circuits which are connected in parallel and then are connected with the constant current power supply. Each LED circuit comprises a light-emitting diode, a triode and a resistor, wherein each light-emitting diode, the collector electrode of each triode, the emitting electrode of each triode and each resistor are connected in series. An adjustable resistor Rovp is further connected in the first path LED circuit in series, and the base electrodes of the triodes of all the LED circuits are connected together and then are electrically connected with the collector electrode of the triode in the first LED circuit.
Description
Technical field
The present invention relates to the multi-path flow equalizing circuit of a kind of LED of being applied to.
Background technology
The LED lamp is fluorescent lamp as an alternative, is widely used in commercial lighting and office lighting, and work brings great convenience to daily life.One large characteristics of LED lamp are directly to power with civil power, so the LED lamp will just need to provide corresponding power drives as illuminating lamp; Efficiency is high in order to ensure designing, output current LED lamp driving power source stably, common design adopt plurality of LEDs all series connection or multichannel string and mode.All the advantage of series system is that the single channel Current Control is simple, and shortcoming is to be subjected to LED series connection number affects, and the Power Management Design limitation is large, and the power source design of different product wattage can be fully different, significantly increase the product certification expense.The advantage of multichannel string mode is can be by controlling series LED quantity, and the string number of regulating parallel connection LED obtains the product of different capacity, and what will make like this is only the size that changes electric power outputting current; Shortcoming is to guarantee that the size of current on every string LED is consistent.Due to the difference of every LEDs heat radiation, forward conduction voltage, can directly affect the life-span that goes out optical property and LED itself of LED; Usually the method that adopts current-limiting resistance or multiple constant current to control IC is controlled the size of every road electric current.Current-limiting resistance is to seal in resistance in every paths of LEDs, although 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 more the high resistance loss is larger for resistance, and power-efficient is lower.The advantage of multiple constant current IC is, control precision is high, and efficiency is high, and modulability is good, and shortcoming is that peripheral components is many, complex circuit, volume is large, cost is high.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned background technology, a kind of LED multi-path flow equalizing circuit is provided, this circuit should have that peripheral components is few, and circuit is simple, with low cost, the characteristics that the Current Control precision is high.
Technical scheme provided by the invention is: a kind of LED multi-path flow equalizing circuit is characterized in that: this circuit comprises provides after galvanic constant-current supply and parallel connection the LED multi-path circuit joined with constant-current supply again; Every paths of LEDs circuit includes a light-emitting diode, a triode and a resistance, and light-emitting diode wherein, the collector electrode of triode, transistor emitter and resistance serial connection communicate; And in first via LED circuit, also be connected in series adjustable resistance Rovp, in each paths of LEDs circuit, the base stage of triode is common be electrically connected to after again with first via LED circuit in the collector electrode electric connection of triode.
Resistance in described every paths of LEDs circuit is all identical.
Resistance in described every paths of LEDs circuit is adjustable resistance.
The invention has the beneficial effects as follows: because the resistance in every paths of LEDs circuit has adopted the adjustable resistance of resistance, thereby can control the current-sharing precision by regulating resistance, not only the electric current current sharing control accuracy is high, and the LED multi-path flow equalizing circuit peripheral components provided is few, without IC, circuit is simple, easy to control, with low cost; Can reduce the quantity of power supply output control line in addition, and can be integrated on lamp plate with LED.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of LED flow equalizing circuit of the present invention.
Embodiment
Below in conjunction with embodiment shown in the drawings, further illustrate.
Circuit of the present invention is by shown in Figure 1: this circuit comprise provide galvanic constant-current supply (normally battery or AC ?the DC power supply, by positive terminal V+ and negative pole end V ?direct current is provided) and parallel connection after the LED multi-path circuit that joins with constant-current supply again, direct current is divided into multichannel, and power supply is lighted it to the LED 1～LEDn in each paths of LEDs circuit; Every paths of LEDs circuit includes a LED (having shown LED 1, LED2, LED3, LEDn in each paths of LEDs circuit in figure), a triode (having shown triode G1, G2, G3, Gn in each paths of LEDs circuit in figure) and a resistance (having shown resistance R 1, R2, R3, Rn in each paths of LEDs circuit in figure), and LED wherein, transistor collector, transistor emitter and resistance serial connection communicate; Wherein in first via LED circuit, go back series resistor Rovp, the transistor base in each paths of LEDs circuit is common be electrically connected to after again with first via LED circuit in the transistor collector electric connection.
As preferably, the resistance in described every paths of LEDs circuit is all identical.
As preferably, the resistance in described every paths of LEDs circuit is adjustable resistance.
Operation principle of the present invention is: after electric current flows through respectively LED 1～LEDn, can enter triode Q1～Qn, due to the base stage of triode Q1～Qn all with the short company of the collector electrode of triode Q1, make the base voltage of triode Q1～Qn equal the collector voltage of triode Q1, so described triode Q1～Qn is operated in amplification region, and the electric current of the LED 1～LEDn that flows through respectively all is subject to flowing into the size of current control of triode Q1 base stage.After the mono-road electric current of LEDn in LED 1～LEDn increases, the voltage be added on Rn can increase, the voltage difference of triode Qn base stage and emitter is reduced, will limit the electric current flow through on triode Qn, the electric current flow through accordingly on LEDn also can be limited to reduce; Otherwise, if in LED 1～LEDn, LEDn mono-road electric current reduces, the voltage be added on Rn can reduce, and the voltage difference of triode Qn base stage and emitter is increased, will increase the electric current flow through on triode Qn, the electric current flow through accordingly on LEDn also can increase.If the voltage of LED 1 is too small, the base voltage of triode Q1 is too high, can compensate by the resistance that increases resistance R ovp the voltage difference of LED 1 and other LED so.Played the effect of controlling the electric current current-sharing of every road.
Due to the voltage difference of triode Q1～Qn base stage and emitter, be subjected to the impact of resistance R 1～Rn, thus the resistance of resistance R 1～Rn to equate, strengthens resistance and 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 (3)
1. LED multi-path flow equalizing circuit is characterized in that: this circuit comprises provides after galvanic constant-current supply and parallel connection the LED multi-path circuit joined with constant-current supply again; Every paths of LEDs circuit includes a light-emitting diode, a triode and a resistance, and light-emitting diode wherein, the collector electrode of triode, transistor emitter and resistance serial connection communicate; And in first via LED circuit, also be connected in series adjustable resistance (Rovp), in each paths of LEDs circuit, the base stage of triode is common be electrically connected to after again with first via LED circuit in the collector electrode electric connection of triode.
2. a kind of LED multi-path flow equalizing circuit according to claim 1, it is characterized in that: the resistance in described every paths of LEDs circuit is all identical.
3. a kind of LED multi-path flow equalizing circuit according to claim 2, it is characterized in that: the resistance in described every paths of LEDs circuit is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103451465A CN103415112A (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103451465A CN103415112A (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103415112A true CN103415112A (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103451465A Pending CN103415112A (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
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| CN (1) | CN103415112A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023051698A1 (en) * | 2021-09-29 | 2023-04-06 | 嘉兴山蒲照明电器有限公司 | Led filament and bulb lamp applying same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201611970U (en) * | 2010-02-04 | 2010-10-20 | 深圳市麦格米特电气技术有限公司 | Novel multiple-way LED constant current drive circuit |
| KR20120004852U (en) * | 2010-12-24 | 2012-07-04 | 리 웬 마오 | Array constant-current multi-driving circuit |
| CN103298222A (en) * | 2013-07-03 | 2013-09-11 | 上海顿格电子贸易有限公司 | Light-emitting diode (LED) multi-channel current-sharing circuit |
| CN203298222U (en) * | 2013-06-19 | 2013-11-20 | 苏州信亚科技有限公司 | Movable outdoor LED lamp support |
| CN203537605U (en) * | 2013-08-09 | 2014-04-09 | 杭州宇中高虹照明电器有限公司 | LED multi-path current sharing circuit |
-
2013
- 2013-08-09 CN CN2013103451465A patent/CN103415112A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201611970U (en) * | 2010-02-04 | 2010-10-20 | 深圳市麦格米特电气技术有限公司 | Novel multiple-way LED constant current drive circuit |
| KR20120004852U (en) * | 2010-12-24 | 2012-07-04 | 리 웬 마오 | Array constant-current multi-driving circuit |
| CN203298222U (en) * | 2013-06-19 | 2013-11-20 | 苏州信亚科技有限公司 | Movable outdoor LED lamp support |
| CN103298222A (en) * | 2013-07-03 | 2013-09-11 | 上海顿格电子贸易有限公司 | Light-emitting diode (LED) multi-channel current-sharing circuit |
| CN203537605U (en) * | 2013-08-09 | 2014-04-09 | 杭州宇中高虹照明电器有限公司 | LED multi-path current sharing circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023051698A1 (en) * | 2021-09-29 | 2023-04-06 | 嘉兴山蒲照明电器有限公司 | Led filament and bulb lamp applying same |
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Application publication date: 20131127 |