CN201557300U - Two-path flow-equalizing control circuit suitable for LED driver - Google Patents

Two-path flow-equalizing control circuit suitable for LED driver Download PDF

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Publication number
CN201557300U
CN201557300U CN2009202682705U CN200920268270U CN201557300U CN 201557300 U CN201557300 U CN 201557300U CN 2009202682705 U CN2009202682705 U CN 2009202682705U CN 200920268270 U CN200920268270 U CN 200920268270U CN 201557300 U CN201557300 U CN 201557300U
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China
Prior art keywords
triode
resistance
led
control circuit
voltage
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Expired - Lifetime
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CN2009202682705U
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Chinese (zh)
Inventor
华桂潮
葛良安
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Inventronics Hangzhou Co Ltd
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Inventronics Hangzhou Co Ltd
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Abstract

The utility model discloses a two-path flow-equalizing control circuit, which includes a constant flow source, a flow equalizing control circuit, two paths of loads consisting of a plurality of LEDs. The two-path flow-equalizing control circuit is characterized in that 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 are included. The two-path flow-equalizing control circuit has the benefits as follows: two paths of flow-equalizing control circuits are simple, the cost is low, and the control circuit dispenses with the auxiliary power supply; and the two paths of flow-equalizing control circuits are arranged independently from the single-output constant flow source and used as an independent module, and the control circuit is applicable to a standard single path of constant current source.

Description

A kind of dual-way equalizing control circuit that is applicable to led driver
Technical field
The utility model 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, is difficult to obtain desirable current-sharing effect when two paths of LED pressure reduction is big.The flow equalizing circuit that common mean value current-equalizing method, maximum current-equalizing method etc. are made of operational amplifier or special-purpose current-sharing chip, current-sharing precision height but circuit complexity, need not to be suitable for small-power LED application scenario cheaply additionally for flow equalizing circuit provides accessory power supply.
Summary of the invention
The utility model proposes a kind of simple circuit of using at the problems referred to above, realizes 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 utility model is: the voltage that supposition LED1 props up the paths of LEDs lamp is low, and LED2 props up the voltage height of paths of LEDs lamp, and then the electric current of LED1 branch road is big, resistance R S1Both end voltage 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 S2Both end voltage V RS2Low, make triode Q 12Collector electrode and emitter both end 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, when LED1 props up the modulating voltage height of paths of LEDs, 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.
The beneficial effects of the utility model:
1. dual-way equalizing control circuit is simple in structure, and cost is low, and control circuit does not need to 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
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a kind of dual-way equalizing control circuit that is applicable to led driver of the present utility model.
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 utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.

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.
CN2009202682705U 2009-11-05 2009-11-05 Two-path flow-equalizing control circuit suitable for LED driver Expired - Lifetime CN201557300U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102595680A (en) * 2011-01-07 2012-07-18 英飞特电子（杭州）有限公司 Multi-output LED (Light-Emitting Diode) constant-current driving circuit
CN102595714A (en) * 2012-01-19 2012-07-18 江苏好的节能光电科技有限公司 Shunt constant-current control circuit for LED chip matrix light source
CN101715267B (en) * 2009-11-05 2012-11-28 英飞特电子（杭州）股份有限公司 Dual-way equalizing control circuit suitable for LED driver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101715267B (en) * 2009-11-05 2012-11-28 英飞特电子（杭州）股份有限公司 Dual-way equalizing control circuit suitable for LED driver
CN102595680A (en) * 2011-01-07 2012-07-18 英飞特电子（杭州）有限公司 Multi-output LED (Light-Emitting Diode) constant-current driving circuit
CN102595680B (en) * 2011-01-07 2014-02-12 英飞特电子（杭州）股份有限公司 Multi-output LED (Light-Emitting Diode) constant-current driving circuit
CN102595714A (en) * 2012-01-19 2012-07-18 江苏好的节能光电科技有限公司 Shunt constant-current control circuit for LED chip matrix light source

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GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20100818

Effective date of abandoning: 20091105

RGAV Abandon patent right to avoid regrant