CN102014544B - LED (Light-Emitting Diode) lamp driving circuit - Google Patents
LED (Light-Emitting Diode) lamp driving circuit Download PDFInfo
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- CN102014544B CN102014544B CN201010226550.7A CN201010226550A CN102014544B CN 102014544 B CN102014544 B CN 102014544B CN 201010226550 A CN201010226550 A CN 201010226550A CN 102014544 B CN102014544 B CN 102014544B
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Abstract
The invention relates to an LED (Light-Emitting Diode) lamp driving circuit in which a constant-current source and multiple paths of current mirror circuits are used to form a multi-path constant-current current-sharing circuit. The LED lamp driving circuit comprises a constant-current source, a constant-current driving circuit, a sampling circuit, at least one load circuit and current mirror circuits correspondingly connected with the load circuits, wherein the load circuits are connected in parallel with a power supply, the sampling circuit is used for collecting the logic combination voltage of the current mirror circuits, and the constant-current driving circuit is connected with the sampling circuit and the current mirror circuits and controls the current-sharing adjustment of the current mirror circuits according to the voltage collected by the sampling circuit. The LED lamp driving circuit of the invention controls the current mirror circuits to perform current-sharing adjustment by collecting the logic combination voltage of the current mirror circuits, thereby not only meeting the high current-sharing accuracy, but also improving the driving efficiency; in addition, the LED (Light-Emitting Diode) lamp driving circuit has the advantage of simple circuit and low cost.
Description
Technical field
The present invention relates to drive circuit technical field, particularly a kind of LED lamp drive circuit.
Background technology
Along with intensifying of world energy sources crisis, reduce energy consumption, protection of the environment has become common recognition.LED illumination will replace the low first generation and the second generation lighting technology of efficiency.For LED illuminating lamp, TI, ONSEMI, PIDeng company have developed many products.Circuit topology comprises BUCK, BOOST, FLYBACK, LLC and linear current stabilization etc., and the technology of employing comprises following two kinds:
(1) current mode PWM control technology, by the electric current of Direct Sampling series LED, compares this sample rate current and reference voltage, and adjusts duty ratio according to comparative result, thereby controls the operating current of LED.
(2) linear steady flow, by the electric current of Direct Sampling series LED, compares this sample rate current and reference voltage, and according to comparative result, adjusts the conduction impedance of barretter, thereby controls the operating current of LED.
Existing high-power LED illuminating lamp is general adopts many LED series connection, and every a string LED needs corresponding constant-current source to drive separately.Therefore,, when multi-string LED parallel operation, need the constant current source power supply of corresponding number.And each road constant-current source is necessary complete independently current sample all, the power consumption of its sampling resistor will increase, and design a plurality of constant-current sources simultaneously and also make cost increase.Can simplified design if adopt a road constant-current source and multichannel current mirror circuit to form multiple constant current flow equalizing circuit, but the power consumption of uncontrollable flow equalizing circuit.
Summary of the invention
Main purpose of the present invention is to provide a kind of LED lamp drive circuit, is intended to reduce the cost of LED lamp drive circuit, improves drive efficiency.
The invention provides a kind of LED lamp drive circuit, comprising: the current mirror circuit of constant-current source, constant-current drive circuit, sample circuit, at least one road load circuit and connection corresponding to load circuit, wherein said load circuit and power supply are connected in parallel; Described sample circuit is for gathering the voltage of current mirror circuit logical combination; Described constant-current drive circuit is connected with sample circuit and current mirror circuit, and the voltage gathering according to Acquisition Circuit is controlled current mirror circuit and carried out current-sharing adjusting.
Preferably, above-mentioned current mirror circuit comprises the switching tube of connection corresponding to load circuit, and the drain electrode of described switching tube is connected with load circuit, and grid is all connected with constant-current drive circuit, according to the control of constant-current drive circuit, load circuit is carried out to current-sharing adjusting.
Preferably, the voltage of the current mirror circuit logical combination of above-mentioned Acquisition Circuit collection comprises minimum voltage, average voltage or maximum voltage.
Preferably, above-mentioned constant-current drive circuit comprises operational amplifier, and the normal phase input end of described operational amplifier is connected with sample circuit, and inverting input is connected with the source electrode of switching tube, and output is connected with the grid of switching tube; Described operational amplifier, according to normal phase input end signal and anti-phase input end signal, produces output signal, controls current mirror circuit load circuit is carried out to current-sharing adjusting.
Preferably, above-mentioned constant-current drive circuit also comprises feedback resistance and divider resistance, and one end of described feedback resistance is connected with the output of operational amplifier, and the other end is connected with the inverting input of operational amplifier; One end of divider resistance is connected with the inverting input of feedback resistance and operational amplifier, and the other end is connected with the source electrode of switching tube.
Preferably, above-mentioned feedback resistance and divider resistance are adjustable resistance.
Preferably, above-mentioned switching tube mosfet transistor or BIPOLAR transistor.
Preferably, above-mentioned load circuit comprises that at least two LED are connected in series.
LED lamp drive circuit of the present invention, by gathering the voltage of current mirror circuit logical combination, is controlled current mirror circuit and is carried out current-sharing adjusting, can meet high current-sharing precision, can improve drive efficiency again.And its circuit is simple, cheap.
Accompanying drawing explanation
Fig. 1 is the structural representation of LED lamp drive circuit one embodiment of the present invention;
Fig. 2 is the electrical block diagram of LED lamp drive circuit one embodiment of the present invention;
Fig. 3 is the output characteristic schematic diagram of the switching tube that LED lamp drive circuit of the present invention is relevant;
Fig. 4 is the laboratory report of switching tube in LED lamp drive circuit of the present invention;
Fig. 5 is the artificial circuit figure of LED lamp drive circuit one embodiment of the present invention;
Fig. 6 is the simulation result figure of LED lamp drive circuit in above-described embodiment.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is the structural representation of a kind of embodiment of LED lamp drive circuit of the present invention.
The present embodiment LED lamp drive circuit adopts constant-current source and multichannel current mirror circuit formation multiple constant current flow equalizing circuit, comprise constant-current source 10, constant-current drive circuit 20, sample circuit 30, at least one road load circuit 40 and with the current mirror circuit 50 of the corresponding connection of load circuit 40.Wherein, multichannel loading circuit 40 is connected in parallel with constant-current source 10.Sample circuit 30 is for gathering the voltage of current mirror circuit 50 logical combinations.Constant-current drive circuit 20 is connected with wherein a road load circuit 40, sample circuit 30, and the voltage gathering according to sample circuit 30 is controlled current mirror circuit 50 and carried out current-sharing adjusting.
Fig. 2 is the circuit structure diagram of LED lamp drive circuit of the present invention.In the present embodiment LED lamp drive circuit, load circuit 40 is 3 tunnels.
The voltage of current mirror circuit 50 logical combinations that above-mentioned sample circuit 30 gathers comprises minimum voltage, average voltage or maximum voltage.
Constant-current drive circuit 20 comprises operational amplifier X1, feedback resistance R2 and divider resistance R3.The normal phase input end of this operational amplifier X1 is connected with the drain electrode of switching tube, and inverting input is connected with feedback resistance R2 and divider resistance R3.Operational amplifier X1, according to normal phase input end signal and anti-phase input end signal, produces output signal, and exports the grid of switching tube to, and control switch pipe carries out current-sharing adjusting to load circuit 40.One end of feedback resistance R2 is connected with the output of operational amplifier X1, and the other end is connected with the inverting input of operational amplifier X1, and for the negative feedback of operational amplifier X1, the constant current that has realized load circuit 40 drives.One end of divider resistance R3 is connected with the source electrode of switching tube, and the other end is connected with the inverting input of feedback resistance R2 and operational amplifier X1.This operational amplifier X1, feedback resistance R2 and divider resistance R3 can form minimum power consumption constant current Drive and Control Circuit.
Above-mentioned constant-current source also can replace with constant pressure source, makes this constant pressure source can reach the effect that constant-current source is equal to, for load provides constant current according to the impedance operator of load.
Fig. 3 is the output characteristic curve figure of MOSFET.This MOSFET is with reference to the switching tube of the model BSH105 of Philip.As shown in Figure 3, the ID electric current of this switching tube BSH105 is subject to the control of VGS, and wherein VGS is the voltage between switching tube BSH105 source electrode and grid.When VGS is 1.1V, its ID current constant, be about 0.3A.VDS is the drain electrode of switching tube BSH105 and the voltage between source electrode, can in the voltage range of 0.5V～2V, change.And VDS is higher, the loss of switching tube is larger.
Because the VGS of the switching tube of multichannel loading circuit 40 correspondences in the present embodiment is equal, the electric current that flows through switching tube also equates.Therefore the total current I that constant-current source 10 provides, by 3 parts of average out to, flows through respectively the switching tube of each road load circuit 40 correspondence.When I is 1.05A, the electric current I D that flows through the switching tube of each road load current 40 correspondence is 350mA.Therefore, by adjusting the ratio of feedback resistance R2, divider resistance R3, thereby the size of by-pass cock pipe VGS meets the precision of current-sharing.And select maximum VDS by sample circuit, can obtain minimum power consumption.
Fig. 4 is the laboratory report of switching tube in LED lamp drive circuit of the present invention.The switching tube of the BS296 model that wherein this switching tube is Siemens Company.As shown in Figure 4,1 tunnel load, 46 LED lamp of connecting, input current is 1.05A, if make current-sharing effect best (each road load current is respectively 0.363A, 0.353A, 0.343A), current error is only 5.51%.The loss of MOSFET large (total power consumption of MOSFET reaches 0.79W).If make power consumption minimum (total power consumption of MOSFET is 0.499W), current-sharing effect relatively poor (load current is respectively 0.354A, 0.390A, 0.317A), current error is up to 18.72%.Therefore, the adjusting of the logical combination of the current mirror circuit gathering by Acquisition Circuit 30, feedback resistance R2 and divider resistance R3 resistance, can reach the object that current-sharing effect is better and power consumption is minimum.
Fig. 5 is the artificial circuit of the present embodiment LED lamp drive circuit, and the parameter of each element as shown in Figure 5.
Impedance between first via load circuit and No. second load circuit differs 220m Ω, and the impedance between Third Road load circuit differs 470m Ω.The switching tube of connection corresponding to load circuit is the switching tube of the BSH105 model of PHILIPS Co..The voltage that sample circuit gathers switching tube logical combination is maximum voltage, gathers the voltage VDS of the switching tube that first via load circuit is corresponding.The resistance of feedback resistance R2 is 22K Ω, and the resistance of divider resistance R3 is 10K Ω.The electric current of constant-current source is 1.05A.
Fig. 6 is the simulation result of the present embodiment LED lamp drive circuit.
As shown in Figure 6, in the present embodiment LED lamp drive circuit, the electric current I D1 of switching tube Q1 is 358mA, and the electric current I D2 of switching tube Q2 is 351mA, and the electric current I D3 of switching tube Q3 is 334mA.The VDS1 of switching tube Q1 is 1V, and the VDS2 of switching tube Q2 is 0.962V, and the VDS3 of switching tube Q3 is 0.928V.Therefore, the power consumption of switching tube Q1 is 149.6mW, and the power consumption of switching tube Q2 is 131mW, and the power consumption of switching tube Q3 is 115.8mW.
LED lamp drive circuit of the present invention, by gathering the voltage of current mirror circuit logical combination, is controlled current mirror circuit and is carried out current-sharing adjusting, can meet high current-sharing precision, can improve drive efficiency again.And its circuit is simple, cheap.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a LED lamp drive circuit, is characterized in that, comprises the current mirror circuit of constant-current source, constant-current drive circuit, sample circuit, at least one road load circuit and connection corresponding to load circuit, and wherein said load circuit and power supply are connected in parallel; Described sample circuit is for gathering the voltage of current mirror circuit logical combination; Described constant-current drive circuit is connected with sample circuit and current mirror circuit, and the voltage of the described current mirror circuit logical combination gathering according to Acquisition Circuit is controlled current mirror circuit and carried out current-sharing adjusting;
Wherein, described constant-current drive circuit comprises operational amplifier, feedback resistance and divider resistance, the normal phase input end of described operational amplifier is connected with sample circuit, and inverting input is connected with feedback resistance and divider resistance in described constant-current drive circuit, and output is connected with the grid of switching tube; One end of described feedback resistance is connected with the output of operational amplifier, and the other end is connected with the inverting input of operational amplifier; One end of divider resistance is connected with the inverting input of feedback resistance and operational amplifier, and the other end is connected with the source electrode of switching tube; Described operational amplifier, according to normal phase input end signal and anti-phase input end signal, produces output signal, controls current mirror circuit load circuit is carried out to current-sharing adjusting.
2. LED lamp drive circuit according to claim 1, it is characterized in that, described current mirror circuit comprises the switching tube of connection corresponding to load circuit, the drain electrode of described switching tube is connected with load circuit, grid is all connected with constant-current drive circuit, according to the control of constant-current drive circuit, load circuit is carried out to current-sharing adjusting.
3. LED lamp drive circuit according to claim 2, is characterized in that, the voltage of the current mirror circuit logical combination of described Acquisition Circuit collection comprises minimum voltage, average voltage or maximum voltage.
4. LED lamp drive circuit according to claim 1, is characterized in that, described feedback resistance and divider resistance are adjustable resistance.
5. according to the LED lamp drive circuit described in any one in claim 2 to 4, it is characterized in that, described switching tube is mosfet transistor or BIPOLAR transistor.
6. according to the LED lamp drive circuit described in any one in claim 1 to 4, it is characterized in that, described load circuit comprises that at least two LED are connected in series.
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| CN201010226550.7A CN102014544B (en) | 2010-07-13 | 2010-07-13 | LED (Light-Emitting Diode) lamp driving circuit |
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| CN201010226550.7A CN102014544B (en) | 2010-07-13 | 2010-07-13 | LED (Light-Emitting Diode) lamp driving circuit |
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| CN102014544B true CN102014544B (en) | 2014-04-16 |
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| CN103067076A (en) * | 2012-12-27 | 2013-04-24 | 武汉华工正源光子技术有限公司 | Detection circuit of optical module burst luminous power |
| JP6199721B2 (en) * | 2013-12-06 | 2017-09-20 | 株式会社小糸製作所 | Vehicle lighting |
| CN104244515B (en) * | 2014-08-20 | 2017-03-22 | 张家港麦智电子科技有限公司 | Multiplexed output constant current source |
| CN104270875B (en) * | 2014-10-27 | 2017-01-18 | 圣邦微电子（北京）股份有限公司 | LED (Light Emitting Diode)-driven control device and method |
| CN105611688A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | LED current sharing circuit |
| US9829905B2 (en) * | 2016-02-26 | 2017-11-28 | GM Global Technology Operations LLC | Methods and apparatus for balancing current across parallel loads |
| CN107071988B (en) * | 2017-06-19 | 2019-05-03 | 合肥惠科金扬科技有限公司 | Multiple constant current output driving circuit and display equipment |
| CN111145683B (en) * | 2020-01-10 | 2021-04-06 | 中科芯集成电路有限公司 | Constant current driving self-adaptive adjusting circuit of LED display screen |
| CN112286270B (en) * | 2020-09-16 | 2022-04-26 | 深圳市崧盛电子股份有限公司 | Multi-output automatic current-equalizing circuit and driving power supply |
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| CN1766963A (en) * | 2004-10-27 | 2006-05-03 | 雅捷科技股份有限公司 | Parallel-connected type light-emitting diode driving device |
| CN1802057A (en) * | 2006-01-16 | 2006-07-12 | 启攀微电子（上海）有限公司 | Current source circuit for driving parallel LED |
| CN1913736A (en) * | 2006-08-30 | 2007-02-14 | 启攀微电子（上海）有限公司 | Current source circuit of multiplex parallel LED driven by one reference current |
| JP4953979B2 (en) * | 2007-08-20 | 2012-06-13 | 三菱電機株式会社 | Light emitting diode lighting circuit and guide lamp lighting device. |
| CN100584135C (en) * | 2008-11-03 | 2010-01-20 | 深圳市联德合微电子有限公司 | Multi-path LED drive circuit |
| CN201426197Y (en) * | 2009-06-04 | 2010-03-17 | 吉林大学 | Mirror image proportion constant-current source circuit for driving multi-way LEDs |
| CN201869400U (en) * | 2010-07-13 | 2011-06-15 | 深圳市航嘉驰源电气股份有限公司 | LED (light-emitting diode) lamp drive circuit |
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