CN101715267B - Dual-way equalizing control circuit suitable for LED driver - Google Patents

Dual-way equalizing control circuit suitable for LED driver Download PDF

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Publication number
CN101715267B
CN101715267B CN2009102213552A CN200910221355A CN101715267B CN 101715267 B CN101715267 B CN 101715267B CN 2009102213552 A CN2009102213552 A CN 2009102213552A CN 200910221355 A CN200910221355 A CN 200910221355A CN 101715267 B CN101715267 B CN 101715267B
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triode
resistance
led
control circuit
voltage
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CN101715267A (en
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华桂潮
葛良安
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Inventronics Hangzhou Co Ltd
Led One Hangzhou Co Ltd
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Led One Hangzhou Co Ltd
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Abstract

The invention discloses a dual-way equalizing control circuit of a LED driver. The control circuit comprises a constant-current source, an equalizing control circuit and a dual-way load composed of a plurality of LED lamps. The control circuit of the invention is characterized in that the equalizing control circuit comprises a triode Q11, a triode Q12, a triode Q21, a triode Q22, a voltage stabilizing tube ZD1, a voltage stabilizing tube ZD2, a resistor RS1, a resistor RS2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4. The beneficial effects of the invention are as follows: 1. the dual-way equalizing control circuit has simple structure and low cost and does not need an auxiliary power; and 2. the dual-way equalizing control circuit is independent to the single output constant-current source, and can be used as a module to be used independently, thus being applicable to the standard one-way constant-current source.

Description

A kind of dual-way equalizing control circuit that is applicable to led driver
Technical field
The present invention relates to a kind of dual-way equalizing control circuit that is applicable to led driver.Should be a kind of constant-current drive circuit that is used for LED, the technology of current-sharing in the time of can realizing two paths of LED load parallel connection use specifically.
Background technology
When the single channel constant-current LED driver directly drives the LED of two-way parallel connection, because the difference of the pressure drop of two paths of LED will cause the imbalance of electric current.A common current equalizing method is a series resistance in two paths of LED, utilizes falling of resistance voltage to help to realize current-sharing.The big more current-sharing precision of the resistance of flows resistance is high more, but loss is also big more, when two paths of LED pressure reduction is big, is difficult to obtain desirable current-sharing effect.The flow equalizing circuit that common mean value current-equalizing method, maximum current-equalizing method etc. are made up of operational amplifier or special-purpose current-sharing chip; Current-sharing precision height but complicated circuit; Need be extra for flow equalizing circuit provides accessory power supply, be not suitable for small-power LED application scenario cheaply.
Summary of the invention
The present invention is directed to the problems referred to above, propose a kind of simple circuit of using, realize the sharing control of two paths of LED driver.
The technical scheme that addresses the above problem employing is: a kind of dual-way equalizing control circuit of led driver, comprise constant-current source, and equalizing control circuit, the load that a plurality of LED lamps of two routes are formed is characterized in that:
Described equalizing control circuit comprises triode Q 11, triode Q 12, triode Q 21, triode Q 22, voltage-stabiliser tube ZD 1, voltage-stabiliser tube ZD 2, resistance R S1, resistance R S2, resistance R 1, resistance R 2, resistance R 3, resistance R 4Specifically: triode Q 11Base stage connecting resistance R 1An end and voltage-stabiliser tube ZD 1Negative electrode, triode Q 11Collector electrode connecting resistance R S1An end and resistance R 4An end, resistance R S1The other end and voltage-stabiliser tube ZD 1Plus earth, resistance R 1Another termination triode Q 12Collector electrode, triode Q 12Grounded emitter, triode Q 12Base stage connecting resistance R 3An end, resistance R 3Other end connecting resistance R S2An end and triode Q 21Collector electrode, triode Q 21Base stage meet voltage-stabiliser tube ZD 2Negative electrode and resistance R 2An end, resistance R S2The other end and voltage-stabiliser tube ZD 2Plus earth, resistance R 2Another termination triode Q 22Collector electrode, triode Q 22Base stage connecting resistance R 4The other end, triode Q 22Grounded emitter; Described LED load comprises LED1 branch road and LED2 branch road, and LED1 props up route LED 11LED N1Be composed in series, LED2 props up route LED 21LED 2nBe composed in series, the constant-current source output cathode meets LED 11Anode and LED 21Anode, LED 1nNegative electrode meet triode Q 11Emitter, LED 2nNegative electrode meet triode Q 21Emitter, constant-current source output negative pole ground connection.
Equalizing control circuit principle of the present invention is: the voltage that supposition LED1 props up the paths of LEDs lamp is low, and the voltage that LED2 props up the paths of LEDs lamp is high, and then the electric current of LED1 branch road is big, resistance R S1Voltage V RS1Height makes triode Q 22Collector electrode and emitter voltage reduce triode Q 21Base current increases, and can adjust the LED2 branch current suitably increases; The electric current of LED2 branch road is little, then resistance R S2Voltage V RS2Low, make triode Q 12Collector electrode and emitter voltage improve triode Q 11Base current reduces, and can adjust the LED1 branch current and suitably reduce, thereby the automatic current equalizing of realizing two paths of LED is regulated.Because the symmetry of circuit, the modulating voltage that props up paths of LEDs as LED1 is high, and LED2 props up the modulating voltage of paths of LEDs when low, and the current-sharing adjustment process is similar.
Described equalizing control circuit, its current-sharing precision and Q 12And Q 22The comformity relation of current amplification factor is very big, Q 12And Q 22Choose the approaching triode of multiplication factor as far as possible and could obtain better current-sharing performance.
Beneficial effect of the present invention:
1. dual-way equalizing control circuit is simple in structure, and cost is low, and control circuit need not provide accessory power supply.
2. dual-way equalizing control circuit is independent of single output constant-current source, can be used as module and independently uses, and is applicable to the single channel constant-current supply of standard.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is a kind of dual-way equalizing control circuit that is applicable to led driver of the present invention.
Specific embodiment
With reference to Fig. 1, a kind of dual-way equalizing control circuit of led driver comprises AC-input voltage Vac, constant-current source, equalizing control circuit, the load that a plurality of LED lamps of two routes are formed, i.e. LED 11LED N1, and LED 21LED 2n, specifically: described AC-input voltage Vac gives the two paths of LED electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source; Described equalizing control circuit comprises triode Q 11, triode Q 12, triode Q 21, triode Q 22, voltage-stabiliser tube ZD 1, voltage-stabiliser tube ZD 2, resistance R S1, resistance R S2, resistance R 1, resistance R 2, resistance R 3, resistance R 4Specifically: triode Q 11Base stage connecting resistance R 1An end and voltage-stabiliser tube ZD 1Negative electrode, triode Q 11Collector electrode connecting resistance R S1An end and resistance R 4An end, resistance R S1The other end and voltage-stabiliser tube ZD 1Plus earth, resistance R 1Another termination triode Q 12Collector electrode, triode Q 12Grounded emitter, triode Q 12Base stage connecting resistance R 3An end, resistance R 3Other end connecting resistance R S2An end and triode Q 21Collector electrode, triode Q 21Base stage meet voltage-stabiliser tube ZD 2Negative electrode and resistance R 2An end, resistance R S2The other end and voltage-stabiliser tube ZD 2Plus earth, resistance R 2Another termination triode Q 22Collector electrode, triode Q 22Base stage connecting resistance R 4The other end, triode Q 22Grounded emitter; Described LED load is made up of LED1 branch road and LED2 branch road, and LED1 props up route LED 11LED N1Be composed in series, LED2 props up route LED 21LED 2nBe composed in series, the constant-current source output cathode meets LED 11Anode and LED 21Anode, LED 1nNegative electrode meet triode Q 11Emitter, LED 2nNegative electrode meet triode Q 21Emitter, constant-current source output negative pole ground connection.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought the protection range of inventing.

Claims (2)

1. the dual-way equalizing control circuit of a led driver comprises constant-current source, equalizing control circuit, and the load that a plurality of LED lamps of two routes are formed is characterized in that described equalizing control circuit comprises triode Q 11, triode Q 12, triode Q 21, triode Q 22, voltage-stabiliser tube ZD 1, voltage-stabiliser tube ZD 2, resistance R S1, resistance R S2, resistance R 1, resistance R 2, resistance R 3And resistance R 4, triode Q 11Base stage connecting resistance R 1An end and voltage-stabiliser tube ZD 1Negative electrode, triode Q 11Collector electrode connecting resistance R S1An end and resistance R 4An end, resistance R S1The other end and voltage-stabiliser tube ZD 1Plus earth, resistance R 1Another termination triode Q 12Collector electrode, triode Q 12Grounded emitter, triode Q 12Base stage connecting resistance R 3An end, resistance R 3Other end connecting resistance R S2An end and triode Q 21Collector electrode, triode Q 21Base stage meet voltage-stabiliser tube ZD 2Negative electrode and resistance R 2An end, resistance R S2The other end and voltage-stabiliser tube ZD 2Plus earth, resistance R 2Another termination triode Q 22Collector electrode, triode Q 22Base stage connecting resistance R 4The other end, triode Q 22Grounded emitter; Described LED load comprises LED1 branch road and LED2 branch road, and LED1 props up route LED 11LED N1Be composed in series, LED2 props up route LED 21LED 2nBe composed in series, the constant-current source output cathode meets LED 11Anode and LED 21Anode, LED 1nNegative electrode meet triode Q 11Emitter, LED 2nNegative electrode meet triode Q 21Emitter, constant-current source output negative pole ground connection.
2. the dual-way equalizing control circuit of led driver as claimed in claim 1 is characterized in that triode Q 12With triode Q 22Multiplication factor identical or approaching.
CN2009102213552A 2009-11-05 2009-11-05 Dual-way equalizing control circuit suitable for LED driver Active CN101715267B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102271440B (en) * 2010-06-01 2014-03-12 浙江思朗照明有限公司 Current-sharing control circuit for multi-path light-emitting diode (LED)
CN102856892B (en) * 2012-04-18 2016-03-30 张宏志 A kind of power supply
CN114845436B (en) * 2022-07-04 2022-10-28 深圳贝特莱电子科技股份有限公司 LED drive circuit multiplexing in general IO port of touch MCU

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005259565A (en) * 2004-03-12 2005-09-22 Matsushita Electric Ind Co Ltd Led driving circuit
JP2008283206A (en) * 2008-06-19 2008-11-20 Aw Japan:Kk Led lighting device
CN201252662Y (en) * 2008-05-09 2009-06-03 深圳市东辰科技有限公司 Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip
CN201557300U (en) * 2009-11-05 2010-08-18 英飞特电子（杭州）有限公司 Two-path flow-equalizing control circuit suitable for LED driver

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005259565A (en) * 2004-03-12 2005-09-22 Matsushita Electric Ind Co Ltd Led driving circuit
CN201252662Y (en) * 2008-05-09 2009-06-03 深圳市东辰科技有限公司 Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip
JP2008283206A (en) * 2008-06-19 2008-11-20 Aw Japan:Kk Led lighting device
CN201557300U (en) * 2009-11-05 2010-08-18 英飞特电子（杭州）有限公司 Two-path flow-equalizing control circuit suitable for LED driver

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Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309

Applicant after: LED One (Hangzhou) Co.,Ltd.

Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309

Applicant before: Inventronics (Hangzhou) Co., Ltd.

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