CN203537605U - LED multi-path current sharing circuit - Google Patents
LED multi-path current sharing circuit Download PDFInfo
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- CN203537605U CN203537605U CN201320484926.3U CN201320484926U CN203537605U CN 203537605 U CN203537605 U CN 203537605U CN 201320484926 U CN201320484926 U CN 201320484926U CN 203537605 U CN203537605 U CN 203537605U
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Abstract
The utility model relates to an LED multi-path current sharing circuit, and aims to provide a circuit with the advantages of being few in external components, 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 the LED circuit comprises a light-emitting diode, a triode and a resistor, wherein each the light-emitting diode, the collector electrode of each the triode, the emitting electrode of each the triode and each the resistor are connected in series. An adjustable resistor Rovp is further connected in a 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 utility model relates to the multi-path flow equalizing circuit of a kind of LED of being applied to.
Background technology
LED lamp is fluorescent lamp as an alternative, is widely used in commercial lighting and office lighting, and to daily life, work brings great convenience.One large feature of LED lamp is directly to power with civil power, so LED lamp will just need to provide corresponding power drives as illuminating lamp; In order to ensure designing, efficiency is high, 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 single channel Current Control is simple, and shortcoming is to be subject to LED series connection number affects, and Power Management Design limitation is large, and the power source design of different product wattage can be completely different, significantly increase product certification expense.The advantage of multichannel string mode is can be by controlling series LED quantity, and the string number of adjusting 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; Conventionally 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 need to strengthen resistance and promote constant current accuracy, and more 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.
Utility model content
The purpose of this utility model is the deficiency that overcomes above-mentioned background technology, and a kind of LED multi-path flow equalizing circuit is provided, and it is few that this circuit should have peripheral components, and circuit is simple, with low cost, the feature that Current Control precision is high.
The technical scheme that the utility model provides 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 joining 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, be also 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 beneficial effects of the utility model are: because the resistance in every paths of LEDs circuit has adopted the adjustable resistance of resistance, thereby can be by regulating resistance to control current-sharing precision, not only electric current current sharing control accuracy is high, and the LED multi-path flow equalizing circuit peripheral components providing 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.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of LED flow equalizing circuit described in the utility model.
Embodiment
Below in conjunction with embodiment shown in the drawings, further illustrate.
Circuit described in the utility model is as shown in Figure 1: this circuit comprise provide galvanic constant-current supply (normally battery or AC ?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 lights it to the LED 1～LEDn power supply 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, transistor base in each paths of LEDs circuit is common be electrically connected to after again with first via LED circuit in 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 utility model 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 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 is all subject to flowing into the size of current control of triode Q1 base stage.After in LED 1～LEDn, LEDn mono-road electric current increases, the voltage being added on Rn can increase, the voltage difference of triode Qn base stage and emitter is reduced, will limit the electric current flowing through on triode Qn, the electric current flowing through accordingly on LEDn also can be limited to reduce; Otherwise, if LEDn mono-road electric current reduces in LED 1～LEDn, the voltage being added on Rn can reduce, and the voltage difference of triode Qn base stage and emitter is increased, will increase the electric current flowing through on triode Qn, the electric current flowing 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 increasing the resistance of 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.
Because the voltage difference of triode Q1～Qn base stage and emitter is subject to the impact of resistance R 1～Rn, thus the resistance of resistance R 1～Rn to equate, strengthens resistance and can improve 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. a 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 joining 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, be also 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, 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, 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 |
|---|---|---|---|
| CN201320484926.3U CN203537605U (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320484926.3U CN203537605U (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537605U true CN203537605U (en) | 2014-04-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320484926.3U Expired - Lifetime CN203537605U (en) | 2013-08-09 | 2013-08-09 | LED multi-path current sharing circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203537605U (en) |
Cited By (4)
| 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 |
| CN104023450A (en) * | 2014-06-19 | 2014-09-03 | 电子科技大学 | Multichannel LED drive circuit |
| CN104023450B (en) * | 2014-06-19 | 2016-11-30 | 电子科技大学 | A kind of multi-channel LED drive circuit |
| CN107948537A (en) * | 2018-01-05 | 2018-04-20 | 深圳市众鑫创展科技有限公司 | Optical signal A/D convertor circuit, optical-filter switcher and optical filter switching method |
-
2013
- 2013-08-09 CN CN201320484926.3U patent/CN203537605U/en not_active Expired - Lifetime
Cited By (5)
| 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 |
| CN104023450A (en) * | 2014-06-19 | 2014-09-03 | 电子科技大学 | Multichannel LED drive circuit |
| CN104023450B (en) * | 2014-06-19 | 2016-11-30 | 电子科技大学 | A kind of multi-channel LED drive circuit |
| CN107948537A (en) * | 2018-01-05 | 2018-04-20 | 深圳市众鑫创展科技有限公司 | Optical signal A/D convertor circuit, optical-filter switcher and optical filter switching method |
| CN107948537B (en) * | 2018-01-05 | 2024-01-05 | 深圳市众鑫创展科技有限公司 | Optical signal AD conversion circuit, optical filter switcher and optical filter switching method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160530 Address after: Gao Gao Hong street Ling'an city Hangzhou City, Zhejiang Province, No. 11 311307 Patentee after: JINGYANG LIGHTING Co.,Ltd. Address before: Gao Gao Hong street Ling'an city Hangzhou City, Zhejiang Province, No. 11 311307 Patentee before: HANGZHOU YUZHONG GAOHONG LIGHTING ELECTRICAL |
|
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
|
| CX01 | Expiry of patent term |