CN102118905A - Circuit suitable for multi-path LED current-sharing control - Google Patents
Circuit suitable for multi-path LED current-sharing control Download PDFInfo
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Abstract
The invention discloses a circuit suitable for multi-path LED current-sharing control, which comprises a single-output constant current source, multiple DC/DC sharing circuits and a load including multiple LED lamps; and each DC/DC sharing circuit comprises a DC/DC converter circuit, a current-sharing control circuit and a PWM (Pulse-Width Modulation) signal generator, wherein each DC/DC sharing circuit is provided with one LED load. The invention has the benefits that firstly, when multiple LED load voltages are close, the multiple DC/DC sharing circuits all work in the high-efficiency state; secondly, the cost and the volume of the multiple DC/DC converters can be effectively reduced; thirdly, the multiple DC/DC sharing circuits are independent from the single-output constant current source, can be independently used as the modules, and are suitable for the standard single constant-current power supply; and the constant current value of the pre-stage single constant-current source is required to be changed according to the demands of dimming, the multiple DC/DC sharing circuits still can keep each path of current automatically shared.
Description
Technical field
The present invention relates to a kind of circuit that is applicable to the LED multi-path sharing control.Should be that a kind of constant-current drive circuit that is used for LED multi-path is realized the constant current control of LED multi-path load in the mode of sharing control specifically.
Background technology
For the application of LED multiple constant current Control Driver, the most frequently used scheme is: constant voltage module+multichannel non-isolation DC/DC constant-current circuit (as the BUCK circuit).With reference to Fig. 1, the output of constant voltage module is as the input of multichannel non-isolation DC/DC constant-current circuit, and every road DC/DC circuit is done constant current control separately, is easy to guarantee the current-sharing of multichannel output current.But because the output voltage (being the input voltage of every road constant-current source) and the voltage difference of LED of constant pressure source are bigger usually, therefore the efficient of back level DC/DC constant-current circuit is not very high, and volume is bigger, and cost is higher.
Summary of the invention
The present invention is directed to the problems referred to above, the high efficiency equalizing control circuit of a kind of usefulness is proposed, realize the constant current control of the well behaved multichannel output of current-sharing LED, when multichannel output LED load voltage is more or less the same, back level DC/DC constant-current circuit is operated in the high efficiency state, effectively reduces the cost and the volume of back level DC/DC constant-current circuit.
The technical scheme that addresses the above problem employing is: a kind of circuit that is applicable to the LED multi-path sharing control comprises single output constant-current source, a multichannel DC/DC flow equalizing circuit and the load of being made up of the LED multi-path lamp; Described each DC/DC flow equalizing circuit comprises a DC/DC translation circuit, an equalizing control circuit and a pwm signal generator, and DC/DC flow equalizing circuit band one a paths of LEDs load.
A kind of circuit that is applicable to the LED multi-path sharing control of the present invention is characterized in that: described single output constant-current source input termination AC-input voltage, output termination multichannel DC/DC flow equalizing circuit;
The input of described every way equalizing control circuit is all from the sampled signal of every road load current sampling resistor to this road electric current, through becoming public connecting line after the equalizing control circuit conversion separately, link together with other each road, become the current-sharing bus, its voltage is Vshare, every road current sampling signal and current-sharing bus voltage are exported the sharing control signal after this way equalizing control circuit inside compares adjusting;
Output pwm signal or level signal after the sharing control signal of described equalizing control circuit output is compared with the modulation signal in the pwm signal generator, the duty ratio of regulating the DC/DC translation circuit;
Described DC/DC translation circuit is realized the conversion of constant-current source output voltage V o to the LED load voltage, and its switching device is accepted the control of pwm signal generator.
Modulation signal in the described pwm signal generator is triangular wave or sawtooth waveforms, realizes with hardware or software.
Described DC/DC translation circuit can be BUCK, BOOST, or DC/DC translation circuit such as BUCK-BOOST.
Beneficial effect of the present invention:
The LED multi-path load voltage near the time, multichannel DC/DC flow equalizing circuit all is operated in high efficiency state.
2. can effectively reduce the cost and the volume of multichannel DC/DC converter.
3. multichannel DC/DC flow equalizing 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.When prime single channel constant-current source need change the current stabilization value because of light modulation, multichannel DC/DC flow equalizing circuit still can keep every road electric current to divide equally automatically.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 prior art circuits block diagram one.
Fig. 2 a kind of circuit structure block diagram that is applicable to the LED multi-path sharing control of the present invention.
Fig. 3 the present invention is a kind of to be applicable to first kind of implementation of DC/DC flow equalizing circuit of the circuit of LED multi-path sharing control.
Fig. 4 the present invention is a kind of to be applicable to second kind of implementation of DC/DC flow equalizing circuit of the circuit of LED multi-path sharing control.
Fig. 5 the present invention is a kind of to be applicable to the third implementation of DC/DC flow equalizing circuit of the circuit of LED multi-path sharing control.
Fig. 6 the present invention is a kind of to be applicable to the 4th kind of implementation of DC/DC flow equalizing circuit of the circuit of LED multi-path sharing control.
Specific embodiment
With reference to Fig. 2, a kind of circuit that is applicable to the LED multi-path sharing control of the present invention comprises single output constant-current source, a multichannel DC/DC flow equalizing circuit and the load of being made up of a plurality of LED lamps; Described each DC/DC flow equalizing circuit comprises a DC/DC translation circuit, an equalizing control circuit and a pwm signal generator.Described DC/DC converter can be all kinds of DC/DC translation circuits such as BUCK, BOOST, BUCK-BOOST; The input of described every way equalizing control circuit is from the sampled signal of every road sampling resistor to this road electric current, through becoming public connecting line after the equalizing control circuit conversion separately, link together with other each road, become the current-sharing bus, its voltage is Vshare; Every road current sampling signal and current-sharing bus voltage are after equalizing control circuit inside compares adjusting, produce the work duty ratio size of the corresponding DC/DC converter of pwm signal or level signal control, thereby control the size of every road electric current, realize the current-sharing of each road electric current.
With reference to Fig. 3, a kind of first kind of implementation that is applicable to the DC/DC flow equalizing circuit of LED multi-path sharing control, specifically: Vo is a prime constant-current source output voltage, Io is its output current, described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1 and sampling resistor Rs, the anode of the direct voltage Vo that the negative electrode of described diode D1 connects and the end of sampling resistor Rs, the anode of diode D1 connect the drain electrode of switching tube S1 and an end of inductance L 1, and the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, another termination LED load negative terminal of inductance L 1, another termination LED load anode of sampling resistor Rs; Described equalizing control circuit comprises the high-side current sample circuit, integrated transporting discharging IC1, resistance R 1 and resistance R 2, capacitor C 1, DC power supply Vcc, the voltage that is input as resistance R s two ends of described high-side current sample circuit, the end of its output connecting resistance R1 and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the gate pole of its output termination switching tube S1.
With reference to Fig. 4, a kind of second kind of implementation of DC/DC flow equalizing circuit of the circuit that is applicable to the LED multi-path sharing control, specifically: Vo is a prime constant-current source output voltage, Io is its output current, described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1 and sampling resistor Rs, the anode of the direct voltage Vo that the negative electrode of described diode D1 connects and the end of sampling resistor Rs, and this node is labeled as signal ground, the anode of diode D1 connects the drain electrode of switching tube S1 and an end of inductance L 1, the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, another termination LED load negative terminal of inductance L 1, another termination LED load anode of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, capacitor C 1, photoelectrical coupler IC3, DC power supply Vcc, reference power supply Vref, the end of the positive terminating resistor R1 of described LED load and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination direct voltage Vcc of resistance R 2, the light-emitting diodes tube cathode of the output termination photoelectrical coupler IC3 of another termination signal ground integrated transporting discharging IC1 of capacitor C 1, the end of its light-emitting diodes tube anode connecting resistance R4, another termination DC power supply Vcc anode of resistance R 4, the end of the phototriode collector electrode connecting resistance R3 of photoelectrical coupler IC3, the anode of another termination reference power supply Vref of resistance R 3, the phototriode emitter of photoelectrical coupler IC3 connects direct voltage Vo negative terminal; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the phototriode collector electrode of photoelectrical coupler IC3, the gate pole of its output termination switching tube S1.
With reference to Fig. 5, a kind of first kind of implementation of DC/DC flow equalizing circuit of the circuit that is applicable to the LED multi-path sharing control, specifically: Vo is a prime constant-current source output voltage, Io is its output current, described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1, sampling resistor Rs and isolation or bootstrapping drive circuit, the gate pole of described switching tube S1 connects the output of isolating or booting drive circuit, the drain electrode of switching tube S1 connects the anode of Vo, and the source electrode of switching tube S1 connects the negative electrode of diode D1 and an end of inductance L 1, another termination LED load anode of inductance L 1, the anode of diode D1 connects the negative terminal of direct voltage Vo and the end of sampling resistor Rs, another termination LED load negative terminal of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1 and resistance R 2, capacitor C 1, DC power supply Vcc, the end of described LED load negative terminal connecting resistance R1 and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the input of its output termination isolation or bootstrapping drive circuit.
With reference to Fig. 6, a kind of first kind of implementation of DC/DC flow equalizing circuit of the circuit that is applicable to the LED multi-path sharing control, specifically: Vo is a prime constant-current source output voltage, Io is its output current, described DC/DC translation circuit topology is the Boost circuit, comprise switching tube S1, diode D1, inductance L 1, sampling resistor Rs and isolation or bootstrapping drive circuit, one end of the positive termination inductance L 1 of described Vo, the drain electrode of another termination switching tube S1 of inductance L 1 and the anode of diode D1, the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, and the negative electrode of diode D1 connects an end and the LED load anode of capacitor C 2, the negative terminal of another termination direct voltage Vo of capacitor C 2 and the end of sampling resistor Rs, another termination LED load negative terminal of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1, resistance R 2 and resistance R 3, capacitor C 1, DC power supply Vcc, the end of described LED load negative terminal connecting resistance R1 and an end of resistance R 3, the reverse input end of another termination integrated transporting discharging IC1 of resistance R 3 and an end of resistance R 2, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, an end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the gate pole of its output termination switching tube S1.
Above-mentioned Fig. 3, Fig. 4, switching tube S1 also can be devices such as triode or IGBT among Fig. 5 and Fig. 6.
At above-mentioned Fig. 3, Fig. 4, the equalizing control circuit among Fig. 5 and Fig. 6 can also be a minimum value current-equalizing method etc. except the mean value current-equalizing method that provides, concrete implementation also has a variety of.Here describe in detail no longer one by one because flow equalizing circuit has the open circuit of a lot of maturations and special chip is available, no matter but which kind of current equalizing method be applied in the equalizing control circuit of this patent all in the protection range of this patent.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the 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 (9)
1. a circuit that is applicable to the LED multi-path sharing control comprises single output constant-current source, a multichannel DC/DC flow equalizing circuit and the load of being made up of the LED multi-path lamp; Described each DC/DC flow equalizing circuit comprises a DC/DC translation circuit, and an equalizing control circuit and a pwm signal generator, and DC/DC flow equalizing circuit band one a paths of LEDs load is characterized in that:
Described single output constant-current source input termination AC-input voltage, output termination multichannel DC/DC flow equalizing circuit;
The input of described every way equalizing control circuit is all from the sampled signal of every road load current sampling resistor to this road electric current, through becoming public connecting line after the equalizing control circuit conversion separately, link together with other each road, become the current-sharing bus, its voltage is V
Share, every road current sampling signal and current-sharing bus voltage are exported the sharing control signal after this way equalizing control circuit inside compares adjusting;
Output pwm signal or level signal after the sharing control signal of described equalizing control circuit output is compared with the modulation signal in the pwm signal generator, the duty ratio of regulating the DC/DC translation circuit;
Described DC/DC translation circuit is realized the conversion of constant-current source output voltage V o to the LED load voltage, and its switching device is accepted the control of pwm signal generator.
2. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 1 is characterized in that described DC/DC translation circuit is BUCK, BOOST, or BUCK-BOOST.
3. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 1 is characterized in that described pwm signal generator, and the modulation signal of its input is realized with hardware or software.
4. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 1 is characterized in that described pwm signal generator, and the modulation signal of its input is triangular wave or sawtooth waveforms.
5. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 2, it is characterized in that described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1 and sampling resistor Rs, the anode of the direct voltage Vo that the negative electrode of described diode D1 connects and the end of sampling resistor Rs, the anode of diode D1 connects the drain electrode of switching tube S1 and an end of inductance L 1, the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, another termination LED load negative terminal of inductance L 1, another termination LED load anode of sampling resistor Rs; Described equalizing control circuit comprises the high-side current sample circuit, integrated transporting discharging IC1, resistance R 1 and resistance R 2, capacitor C 1, DC power supply Vcc, the voltage that is input as resistance R s two ends of described high-side current sample circuit, the end of its output connecting resistance R1 and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the gate pole of its output termination switching tube S1.
6. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 2, it is characterized in that described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1 and sampling resistor Rs, the anode of the direct voltage Vo that the negative electrode of described diode D1 connects and the end of sampling resistor Rs, and this node is labeled as signal ground, the anode of diode D1 connects the drain electrode of switching tube S1 and an end of inductance L 1, the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, another termination LED load negative terminal of inductance L 1, another termination LED load anode of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, capacitor C 1, photoelectrical coupler IC3, DC power supply Vcc, reference power supply Vref, the end of the positive terminating resistor R1 of described LED load and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination direct voltage Vcc of resistance R 2, the light-emitting diodes tube cathode of the output termination photoelectrical coupler IC3 of another termination signal ground integrated transporting discharging IC1 of capacitor C 1, the end of its light-emitting diodes tube anode connecting resistance R4, another termination DC power supply Vcc anode of resistance R 4, the end of the phototriode collector electrode connecting resistance R3 of photoelectrical coupler IC3, the anode of another termination reference power supply Vref of resistance R 3, the phototriode emitter of photoelectrical coupler IC3 connects direct voltage Vo negative terminal; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the phototriode collector electrode of photoelectrical coupler IC3, the gate pole of its output termination switching tube S1.
7. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 2, it is characterized in that described DC/DC translation circuit topology is the Buck circuit, comprise switching tube S1, diode D1, inductance L 1, sampling resistor Rs and isolation or bootstrapping drive circuit, the gate pole of described switching tube S1 connects the output of isolating or booting drive circuit, the drain electrode of switching tube S1 connects the anode of Vo, the source electrode of switching tube S1 connects the negative electrode of diode D1 and an end of inductance L 1, another termination LED load anode of inductance L 1, the anode of diode D1 connects the negative terminal of direct voltage Vo and the end of sampling resistor Rs, another termination LED load negative terminal of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1 and resistance R 2, capacitor C 1, DC power supply Vcc, the end of described LED load negative terminal connecting resistance R1 and the reverse input end of integrated transporting discharging IC1, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, one end of resistance R 2, one end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the input of its output termination isolation or bootstrapping drive circuit.
8. the circuit that is applicable to the LED multi-path sharing control as claimed in claim 2, it is characterized in that described DC/DC translation circuit topology is the Boost circuit, comprise switching tube S1, diode D1, inductance L 1, sampling resistor Rs and isolation or bootstrapping drive circuit, one end of the positive termination inductance L 1 of described Vo, the drain electrode of another termination switching tube S1 of inductance L 1 and the anode of diode D1, the source electrode of switching tube S1 connects the negative terminal of direct voltage Vo, the negative electrode of diode D1 connects an end and the LED load anode of capacitor C 2, the negative terminal of another termination direct voltage Vo of capacitor C 2 and the end of sampling resistor Rs, another termination LED load negative terminal of sampling resistor Rs; Described equalizing control circuit comprises integrated transporting discharging IC1, resistance R 1, resistance R 2 and resistance R 3, capacitor C 1, DC power supply Vcc, the end of described LED load negative terminal connecting resistance R1 and an end of resistance R 3, the reverse input end of another termination integrated transporting discharging IC1 of resistance R 3 and an end of resistance R 2, the positive input of another termination integrated transporting discharging IC1 of resistance R 1, an end of capacitor C 1 and current-sharing bus, another termination DC power supply Vcc of resistance R 2, another termination direct voltage Vo negative terminal of capacitor C 1; Described pwm signal generator comprises comparator IC2 and triangular signal, and described triangular signal connects the reverse input end of comparator IC2, and its positive input connects the output of integrated transporting discharging IC1, the gate pole of its output termination switching tube S1.
9. as any one described circuit that is applicable to the LED multi-path sharing control of claim 5-8, it is characterized in that described switching tube S1 replaces with triode or IGBT.
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| CN102594128A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Average current control device for direct current (DC) average current output system |
| CN103248231A (en) * | 2013-04-02 | 2013-08-14 | 浙江大学 | Multiphase current-sharing controlled parallel-connection adjusting circuit and control method |
| CN103248231B (en) * | 2013-04-02 | 2015-12-23 | 浙江大学 | The Circuit tuning control method in parallel of heterogeneous sharing control |
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| CN103369797B (en) * | 2013-07-25 | 2015-06-03 | 华南理工大学 | Light adjustment device and method of LED (Light Emitting Diode) high-voltage direct current centralized power supply system |
| CN104283543A (en) * | 2014-10-29 | 2015-01-14 | 西安磁林电气有限公司 | Correlation type photoelectric detection switch |
| CN104283543B (en) * | 2014-10-29 | 2017-12-05 | 西安磁林电气有限公司 | A kind of correlation photoelectric detection switch |
| CN104900190A (en) * | 2015-06-23 | 2015-09-09 | 京东方科技集团股份有限公司 | Power supply circuit and organic light-emitting diode display device |
| US9799263B2 (en) | 2015-06-23 | 2017-10-24 | Boe Technology Group Co., Ltd. | Power supply circuit and organic light-emitting diode display device |
| CN104900190B (en) * | 2015-06-23 | 2018-02-06 | 京东方科技集团股份有限公司 | Power circuit, organic LED display device |
| CN105515389A (en) * | 2015-07-31 | 2016-04-20 | 深圳市皓文电子有限公司 | Primary side current sharing method and apparatus for power system having plurality of conversion units |
| CN105515389B (en) * | 2015-07-31 | 2018-04-24 | 深圳市皓文电子有限公司 | The primary side current equalizing method and device of power-supply system with multiple converter units |
| CN105024568A (en) * | 2015-08-05 | 2015-11-04 | 宁波赛耐比光电科技股份有限公司 | Frequency conversion and constant current BUCK circuit |
| CN106102238A (en) * | 2016-07-01 | 2016-11-09 | 安徽亮亮电子科技有限公司 | A kind of circuit being applicable to multipath LED constant current driving |
| CN108183612A (en) * | 2018-03-13 | 2018-06-19 | 北京比特大陆科技有限公司 | Expansible parallel operation DC-DC power source device |
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