CN101790265A - Multichannel constant current control circuit - Google Patents
Multichannel constant current control circuit Download PDFInfo
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- CN101790265A CN101790265A CN200910214477A CN200910214477A CN101790265A CN 101790265 A CN101790265 A CN 101790265A CN 200910214477 A CN200910214477 A CN 200910214477A CN 200910214477 A CN200910214477 A CN 200910214477A CN 101790265 A CN101790265 A CN 101790265A
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Abstract
The invention discloses a multichannel constant current control circuit, comprising a plurality of connected load terminals, multipath constant current circuits, multipath feedback voltage comparison circuits and a photoelectric coupling isolation circuit, wherein a path constant current circuit is connected between each of the connected load terminals and the ground; the voltage signal of each connected load terminal outputs a comparison signal via a path feedback voltage comparison circuit; and the comparison signals output by the multipath feedback voltage comparison signals are transmitted to the input end of the photoelectric coupling isolation circuit, and the output end of the photoelectric coupling isolation circuit outputs feedback signals. In addition, the invention also can be provided with a sampling voltage drive circuit, a connected power supply terminal, and another path feedback voltage comparison circuit, the voltage signals of the connected power supply terminal outputs comparison signals by the feedback voltage comparison circuit and then output to the input end of the photoelectric coupling isolation circuit. The invention fuses the PWM constant voltage technology with the direct current constant current technology, has low cost and high efficiency, realizes multipath independent constant current, and meets the constant current requirement of multi-group LEDs of small and medium power lighting lamps.
Description
Technical field:
The present invention relates to a kind of multichannel constant current control circuit, be applied to multichannel loading constant current control, be mainly used in many group LED constant current controls.
Background technology:
Because the brightness of LED is controlled by constant current, and the main series connection by many groups LED of middle high-power LED illumination realizes, because the difference of LED junction voltage, many groups structure in parallel can't guarantee the constant current of LED, the possibility that has chain reaction simultaneously, i.e. one group of damage causes a chain of the damage.Multiple constant current is an optimal scheme, and voltage source+the multi-channel PWM constant-current source is good scheme to adopt AC/DC, but cost is too high, and the following constant-current source of 120W adopts this scheme price to be difficult to bear.
Summary of the invention:
Purpose of the present invention is exactly at the too high problem of present domestic illumination LED constant-current source cost, proposes the high multichannel constant current control circuit of a kind of cost performance.
For achieving the above object, a kind of multichannel constant current control circuit of the present invention, comprise a plurality of connection face terminals, multiple constant current circuit, multichannel feedback voltage comparison circuit, optical coupling isolation circuit, a plurality of connection face terminals, its each with ground between be connected No. one constant-current circuit, its each voltage signal is through one road feedback voltage comparison circuit output comparison signal, the comparison signal of described multichannel feedback voltage comparison circuit output is all transported to the input of optical coupling isolation circuit, the output output feedback signal of optical coupling isolation circuit.
Also the sampled voltage drive circuit can be set between the input of above-mentioned each connection face terminals and feedback voltage comparison circuit.
Can comprise that also connects a power supply terminal, above-mentioned multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
In one embodiment, above-mentioned constant-current circuit comprises the sampling resistor that is connected between connection face terminals and the ground.
In a kind of preferred implementation, above-mentioned constant-current circuit comprises electric current and adjusts element, sampling resistor, voltage comparator circuit, electric current is connected between connection face terminals and the ground after adjusting element and sampling resistor series connection, electric current is adjusted the input of the voltage signal input voltage comparison circuit of element and sampling resistor tie point, and the output output comparison signal of voltage comparator circuit is adjusted the control end of element to electric current.Electric current is adjusted element and be can be field effect transistor, and then the control end of this electric current adjustment element is the grid of field effect transistor, and electric current is adjusted element and also be can be triode, and then the control end of this electric current adjustment element is the base stage of triode.
The present invention adopts independently constant-current circuit realization multiple constant current of multichannel, avoids one group of damage, causes a chain of the damage, by each being connected the voltage signal sampling feedback of face terminals, realize the closed-loop control of electric power output voltage, make it to reach the minimum voltage of best constant current conditions, reduce power consumption.By to connecting the voltage signal sampling feedback of power supply terminal, realize the closed-loop control of electric power output voltage, the output voltage of avoiding opening a way is too high.In a kind of preferred implementation, adopt independently closed-loop control field effect transistor of multichannel or triode to realize the constant current of multichannel independence, by sampling feedback to field effect transistor or triode voltage across poles, realize the adjustment of electric power output voltage, make it to reach minimum voltage and the field effect transistor or the triode lowest power consumption of best constant current conditions, thereby reach the highest efficient.
PWM manostatic technique and direct current constant current technology have been merged in the present invention, and be with low cost, realized the constant current of multichannel independence simultaneously, and the efficient height satisfies the constant current requirement that the middle low power lighting is organized LED more fully.
AC/DC voltage source+multi-channel PWM constant-current source the scheme and the AC/DC single channel constant-current source scheme that are different from absolute construction.Voltage source+multi-channel PWM current source scheme cost height, AC/DC single channel constant-current source can't satisfy the current-sharing of LED between group, also has chain reaction hidden danger.The present invention has solved cost problem and equal flow problem, efficient height simultaneously well.
Description of drawings:
Fig. 1 is for using circuit working principle schematic of the present invention;
Fig. 2 is the operation principle block diagram of the embodiment of the invention one;
Fig. 3 is the circuit theory diagrams of Fig. 2 constant-current circuit An and sampled voltage drive circuit Bn;
Fig. 4 is Fig. 2 feedback voltage comparison circuit E1, E2 ... the circuit theory diagrams of En, F and optical coupling isolation circuit G;
Fig. 5 is the circuit theory diagrams of the embodiment of the invention two.
Embodiment:
As shown in Figure 1, many group LED are the output loading of Switching Power Supply, a plurality of connection face terminals H1, the H2 of M4CM of the present invention ... Hn is negative pole LED1-, the LED2-of serial connection group LED respectively ... LEDn-, one connects the feeder ear LED+ that power supply terminal OVP connects many group LED, for the purpose of directly perceived, a plurality of connection face terminals that embodiment describes are LED1-to LEDn-, and one connects power supply terminal is LED+, and M4CM output feedback signal FB of the present invention is to the PWMMCU control chip of Switching Power Supply.
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Embodiment one:
As shown in Figure 2, the embodiment of the invention one comprises a plurality of connection face terminals LED1-to LEDn-, one connects power supply terminal LED+, multiple constant current circuit A1 to An, multi-channel sampling Voltag driving circuit B1 to Bn and feedback voltage comparison circuit E1 to En and F, optical coupling isolation circuit G, a plurality of connection face terminals LED1-to LEDn-, its each with ground between be connected No. one constant-current circuit, its each voltage signal is successively through one road sampled voltage drive circuit, feedback voltage comparison circuit output comparison signal, a voltage signal that connects power supply terminal LED+ is through feedback voltage comparison circuit F output comparison signal, multi-channel sampling connects the feedback voltage comparison circuit E1 to En of face terminals, the comparison signal of the feedback voltage comparison circuit F output of one tunnel sampling connection power supply terminal is all transported to the input of optical coupling isolation circuit G, the output output feedback signal FB of optical coupling isolation circuit G.
As shown in Figure 3, be the circuit theory diagrams of Fig. 2 No. one constant-current circuit An and one road sampled voltage drive circuit Bn; Constant-current circuit An comprises electric current and adjusts element field effect transistor Q2, sampling resistor Rsense, voltage comparator circuit, voltage comparator circuit comprises operational amplifier U6A, be connected after field effect transistor Q2 and the sampling resistor Rsense series connection and connect between face terminals LEDn-and the ground, the voltage signal of field effect transistor Q2 and sampling resistor Rsense tie point is through the input of resistance R 6 input operational amplifier U6A, another input of operational amplifier U6A connects reference voltage V e, and the output output comparison signal of operational amplifier U6A is to the grid of field effect transistor Q2.Constant-current circuit An realizes circuit turn-on, and forms closed-loop control by Voltage Feedback and the reference voltage V e of sampling resistor Rsense for adopting operational amplifier output control field effect transistor Q2, realizes the constant of electric current.Sampled voltage drive circuit Bn is an operational amplifier U6B amplifying circuit, is in-phase amplification circuit, realizes that the sampling of the voltage signal Vd of connection face terminals LEDn-drives amplification.
As shown in Figure 4, connect the feedback voltage comparison circuit E1 to En of face terminals, the feedback voltage comparison circuit F of one tunnel sampling connection power supply terminal and the circuit theory diagrams of light-coupled isolation G for Fig. 2 multi-channel sampling; The feedback voltage comparison circuit comprises voltage adjustment TL431, and voltage is adjusted the corresponding voltage signal of input input of TL431.Fig. 4 is that multichannel connects face terminals is connected power supply terminal with one tunnel voltage sample feedback, by light-coupled isolation U2 control PWM MCU control chip.
Vcc is an operating voltage, has adopted among Fig. 3 and Fig. 4+12V, if adopt other voltages, corresponding resistance R 21/R31/R22/R32 ... Deng the needs adjustment of being correlated with.
Amplify by the signal of adjusting sampled voltage, realize the adjustment of electric power output voltage, make it to reach the minimum voltage and the field effect transistor lowest power consumption of best constant current conditions, thereby reach the highest efficient.The field effect transistor internal resistance difference of different model, tube voltage drop is deviation slightly, therefore adopts the field effect transistor of different model, and sample circuit also needs suitable adjustment.
It is field effect transistor Q2 that above-mentioned electric current is adjusted element, also can adopt triode.Above-mentioned sampled voltage drive circuit Bn is the operational amplifier amplifying circuit, also can adopt transistor amplifier.Above-mentioned feedback voltage comparison circuit adopts voltage to adjust TL431, voltage is adjusted the corresponding voltage signal of input input of TL431, also can adopt operational amplifier, a corresponding voltage signal of input input of operational amplifier, another input connects reference voltage, or the like.Operation principle is identical, does not enumerate one by one.
Embodiment two:
As shown in Figure 5, be the circuit theory diagrams of the embodiment of the invention two.Different with embodiment one is, with sampling resistor Rs1, Rs2 ... Rsn has replaced constant-current circuit A1, the A2 of embodiment one ... An has saved sampled voltage drive circuit B1, B2Bn.Sampling resistor Rs1, Rs2 ... the value of Rsn guarantees to flow through the maximum current of load less than rated current, and the voltage sample feedback by a plurality of connection face terminals LED1-to LEDn-realizes multiple constant current.
All the other are identical with embodiment one, the few description.
Claims (10)
1. multichannel constant current control circuit, it is characterized in that, comprise a plurality of connection face terminals, multiple constant current circuit, multichannel feedback voltage comparison circuit, optical coupling isolation circuit, a plurality of connection face terminals, its each with ground between be connected No. one constant-current circuit, its each voltage signal is through one road feedback voltage comparison circuit output comparison signal, the comparison signal of described multichannel feedback voltage comparison circuit output is all transported to the input of optical coupling isolation circuit, the output output feedback signal of optical coupling isolation circuit.
2. circuit according to claim 1 is characterized in that: between the input of described each connection face terminals and feedback voltage comparison circuit the sampled voltage drive circuit is set.
3. circuit according to claim 2 is characterized in that: described sampled voltage drive circuit is the operational amplifier amplifying circuit, perhaps, is transistor amplifier.
4. circuit according to claim 2, it is characterized in that: comprise that also connects a power supply terminal, described multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
5. circuit according to claim 1, it is characterized in that: comprise that also connects a power supply terminal, described multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
6. according to each described circuit of claim 1 to 5, it is characterized in that: described feedback voltage comparison circuit comprises operational amplifier, a corresponding voltage signal of input input of operational amplifier, and another input connects reference voltage; Perhaps, described feedback voltage comparison circuit comprises voltage adjustment TL431, and voltage is adjusted the corresponding voltage signal of input input of TL431.
7. according to each described circuit of claim 1 to 5, it is characterized in that: described constant-current circuit comprises the sampling resistor that is connected between connection face terminals and the ground.
8. according to each described circuit of claim 1 to 5, it is characterized in that: described constant-current circuit comprises electric current and adjusts element, sampling resistor, voltage comparator circuit, electric current is connected between connection face terminals and the ground after adjusting element and sampling resistor series connection, electric current is adjusted the input of the voltage signal input voltage comparison circuit of element and sampling resistor tie point, and the output output comparison signal of voltage comparator circuit is adjusted the control end of element to electric current.
9. circuit according to claim 8, it is characterized in that: described voltage comparator circuit comprises operational amplifier, an input input current of operational amplifier is adjusted the voltage signal of element and sampling resistor tie point, and another input connects reference voltage.
10. circuit according to claim 8 is characterized in that: it is field effect transistor that described electric current is adjusted element, and the control end that this electric current is adjusted element is the grid of field effect transistor; Perhaps, it is triode that described electric current is adjusted element, and the control end that this electric current is adjusted element is the base stage of triode.
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| CN200910214477A CN101790265A (en) | 2009-12-31 | 2009-12-31 | Multichannel constant current control circuit |
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| CN200910214477A CN101790265A (en) | 2009-12-31 | 2009-12-31 | Multichannel constant current control circuit |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005748A (en) * | 2010-11-10 | 2011-04-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | Isolation type positive-negative output constant current protective device |
| WO2012092781A1 (en) * | 2011-01-07 | 2012-07-12 | 英飞特电子（杭州）有限公司 | Multi-output, constant current driving circuit for light emitting diode |
| CN102752917A (en) * | 2012-06-13 | 2012-10-24 | 冠德科技(北海)有限公司 | Multi-path constant current output control device |
| CN102843838A (en) * | 2012-08-31 | 2012-12-26 | 上海遍发电子科技有限公司 | Multipath LED (Light Emitting Diode) current-sharing circuit and LED light |
| CN102841242A (en) * | 2012-08-23 | 2012-12-26 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN103188837A (en) * | 2011-12-31 | 2013-07-03 | 胡益锋 | Power circuit for light emitting diode (LED) illuminating lamp |
| CN103476189A (en) * | 2013-10-12 | 2013-12-25 | 中山市迈得照明有限公司 | Switching type output transformation and variable current LED (Light-Emitting Diode) driving power supply circuit |
| CN103561516A (en) * | 2013-11-05 | 2014-02-05 | 苏州德龙激光股份有限公司 | Controller used for visual imaging LED light source |
| CN103987162A (en) * | 2014-05-08 | 2014-08-13 | 深圳市智华照明科技有限公司 | Load self-adaptation LED power supply |
| CN104768290A (en) * | 2012-12-28 | 2015-07-08 | 电子科技大学 | Multi-path current source switching device |
| CN105101547A (en) * | 2014-08-07 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Multipath LED constant-current drive circuit and driving method and LED drive power |
| CN105739355A (en) * | 2014-12-08 | 2016-07-06 | 四方特变电工智能电气有限公司 | Isolated signal multiplier for PWM constant current source conversion |
| CN106384934A (en) * | 2015-09-11 | 2017-02-08 | 北京特安电源科技有限公司 | Realization method of multipath semiconductor laser driving power supply |
| CN111417235A (en) * | 2020-03-27 | 2020-07-14 | 深圳市蓝色起源发展有限公司 | Constant current output control system |
| CN112098902A (en) * | 2020-08-31 | 2020-12-18 | 贵州天义电器有限责任公司 | Multichannel load on-off state acquisition circuit based on 28V DC power circuit |
| CN114300935A (en) * | 2021-12-28 | 2022-04-08 | 昂纳信息技术（深圳）有限公司 | Laser driving system, laser device, and driving method |
-
2009
- 2009-12-31 CN CN200910214477A patent/CN101790265A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005748A (en) * | 2010-11-10 | 2011-04-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | Isolation type positive-negative output constant current protective device |
| CN102005748B (en) * | 2010-11-10 | 2013-09-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Isolation type positive-negative output constant current protective device |
| WO2012092781A1 (en) * | 2011-01-07 | 2012-07-12 | 英飞特电子（杭州）有限公司 | Multi-output, constant current driving circuit for light emitting diode |
| CN103188837A (en) * | 2011-12-31 | 2013-07-03 | 胡益锋 | Power circuit for light emitting diode (LED) illuminating lamp |
| CN102752917A (en) * | 2012-06-13 | 2012-10-24 | 冠德科技(北海)有限公司 | Multi-path constant current output control device |
| CN102841242B (en) * | 2012-08-23 | 2015-06-17 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN102841242A (en) * | 2012-08-23 | 2012-12-26 | 青岛海信电器股份有限公司 | Sampling circuit and electronic equipment |
| CN102843838B (en) * | 2012-08-31 | 2015-05-06 | 上海遍发电子科技有限公司 | Multipath LED (Light Emitting Diode) current-sharing circuit and LED light |
| CN102843838A (en) * | 2012-08-31 | 2012-12-26 | 上海遍发电子科技有限公司 | Multipath LED (Light Emitting Diode) current-sharing circuit and LED light |
| CN104768290B (en) * | 2012-12-28 | 2017-06-09 | 电子科技大学 | Multipath current-source switching device |
| CN104768290A (en) * | 2012-12-28 | 2015-07-08 | 电子科技大学 | Multi-path current source switching device |
| CN103476189A (en) * | 2013-10-12 | 2013-12-25 | 中山市迈得照明有限公司 | Switching type output transformation and variable current LED (Light-Emitting Diode) driving power supply circuit |
| CN103476189B (en) * | 2013-10-12 | 2018-05-01 | 中山市迈得照明有限公司 | A kind of switching regulator conversion output and the LED drive power circuit of variable current |
| CN103561516A (en) * | 2013-11-05 | 2014-02-05 | 苏州德龙激光股份有限公司 | Controller used for visual imaging LED light source |
| CN103987162B (en) * | 2014-05-08 | 2017-03-08 | 深圳市智华照明科技有限公司 | A kind of loaded self-adaptive LED power |
| CN103987162A (en) * | 2014-05-08 | 2014-08-13 | 深圳市智华照明科技有限公司 | Load self-adaptation LED power supply |
| CN105101547A (en) * | 2014-08-07 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Multipath LED constant-current drive circuit and driving method and LED drive power |
| CN105101547B (en) * | 2014-08-07 | 2018-03-09 | 矽力杰半导体技术(杭州)有限公司 | A kind of multipath LED constant current drive circuit, driving method and LED drive power |
| CN105739355A (en) * | 2014-12-08 | 2016-07-06 | 四方特变电工智能电气有限公司 | Isolated signal multiplier for PWM constant current source conversion |
| CN106384934A (en) * | 2015-09-11 | 2017-02-08 | 北京特安电源科技有限公司 | Realization method of multipath semiconductor laser driving power supply |
| CN111417235A (en) * | 2020-03-27 | 2020-07-14 | 深圳市蓝色起源发展有限公司 | Constant current output control system |
| CN112098902A (en) * | 2020-08-31 | 2020-12-18 | 贵州天义电器有限责任公司 | Multichannel load on-off state acquisition circuit based on 28V DC power circuit |
| CN114300935A (en) * | 2021-12-28 | 2022-04-08 | 昂纳信息技术（深圳）有限公司 | Laser driving system, laser device, and driving method |
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Application publication date: 20100728 |