CN101861012A - Device utilizing current and voltage feedback to realize constant current control - Google Patents
Device utilizing current and voltage feedback to realize constant current control Download PDFInfo
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- CN101861012A CN101861012A CN 201010151462 CN201010151462A CN101861012A CN 101861012 A CN101861012 A CN 101861012A CN 201010151462 CN201010151462 CN 201010151462 CN 201010151462 A CN201010151462 A CN 201010151462A CN 101861012 A CN101861012 A CN 101861012A
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Abstract
The invention discloses a device utilizing current and voltage feedback to realize constant current control, comprising a constant voltage source, a constant current source module, an LED lamp, a signal detection device and a main control center (MCU), wherein a constant-current source is connected with commercial power, the constant current source module has three contact points respectively connected with the constant voltage source, the LED lamp and the MCU, two ends of the signal detection device are respectively connected on the LED lamp and the MCU, the current and voltage signals flowing out from the LED lamp are processed by the signal detection device and then flow into the MCU, an electrical signal is processed by the MCU to generate a PWM modulation signal, and the PWM modulation signal flows into the constant current source module to control the output current of the constant current source module. The invention uses current detection and voltage detection at the same time, thus ensuring accuracy of the signal and the light-emitting life of the LED lamp.
Description
Technical field
The present invention relates to a kind of power control, relate in particular to a kind of constant-current control device.
Background technology
Along with going from strength to strength of LED industry, the every nook and cranny of life is infiltrated in the use of LED gradually, and all LED can relate to the configuration power issue, LED a large amount of popularize with power supply unit design progressive inseparable.Yet the LED electric power system can only play the effect into LED unit or array power supply usually at present, usually it is not equipped with the constant current controlled function of LED luminescence unit, this just causes electric power system can't conveniently regulate its output voltage in use, also limited the quantity of its energy series LED, cause the inconvenience of actual use, and because the crossing current of each branch line of lack of wisdomization control, in case LED luminescence unit of serial connection takes place partly to damage or be removed on it, then the conversion efficiency of whole power supply unit all can sharply descend, increased loss greatly, the waste electric energy, very not environmental protection.
China's utility application prospectus (open day: on January 21st, 2009; Publication number: CN 101350564A) disclose a kind of device of realizing constant current constant voltage control, it has comprised EMI circuit, pfc circuit, PWM controller, switch transformer, DC output circuit and sample circuit, comparison circuit and feedback control circuit, it also can realize constant current control, but circuit complexity, electronic devices and components are many, and loss is big.
Summary of the invention
The present invention has proposed a kind of device that utilizes the current/voltage feedback to carry out constant current control in order to solve the problem of above existence, and the present invention can effectively realize constant current control, guarantees the luminescent lifetime of LED light fixture.
The invention provides following technical scheme: utilize the current/voltage feedback to realize the device of light fixture constant current control, it is characterized in that, comprise constant pressure source, constant-current source module, LED light fixture, signal supervisory instrument, main control centre MCU, described constant-current source links to each other with civil power, described constant-current source module has three contacts, link to each other with constant pressure source, LED light fixture, main control centre MCU respectively, described signal supervisory instrument two ends are connected on LED light fixture and the main control centre MCU.
Further, described signal supervisory instrument comprises voltage signal checkout gear and current signal checkout gear, described voltage signal checkout gear and the parallel connection of current signal checkout gear.
Further again, described current signal checkout gear comprises sample circuit and amplifying circuit, filter circuit, described current signal is flowed through and is obtained sampled signal after sample circuit is sampled, described sampled signal enters amplifying circuit, current signal after the amplification is wave circuit after filtration again, obtains galvanic current and presses signal, enters Master Control Center MCU.
Further again, described filter circuit comprises two rc filter circuits, described two rc filter circuits series connection.
Further, described voltage signal checkout gear comprises capacitance-resistance pressure drop circuit, and described capacitance-resistance pressure drop circuit comprises resistance R 103B, capacitor C 101B and voltage-stabiliser tube D23B, and described capacitor C 101B and voltage-stabiliser tube D23B are in parallel to connect with resistance R 103B simultaneously.
The described signal of telecommunication is handled through main control centre MCU and is produced the PWM modulation signal later, and the PWM modulation signal flows into the constant-current source module, the output current of control constant-current source module.
Beneficial effect of the present invention is:
First: circuit structure is simple, and electronic devices and components are few, has reduced loss;
Second: the present invention has adopted current detecting and voltage detecting simultaneously, has guaranteed the accuracy of signal;
The the 3rd: the luminescent lifetime that can guarantee the LED lamp.
Description of drawings
Fig. 1 constant-current control device principle assumption diagram of the present invention;
Fig. 2 current sensing means feedback circuit of the present invention schematic diagram;
Fig. 3 voltage check device circuit diagram of the present invention.
Embodiment
The present invention is described in more detail below in conjunction with drawings and Examples:
In conjunction with Fig. 1, the constant-current control device principle assumption diagram, constant pressure source connects civil power, described constant-current source module has three contacts, link to each other with constant pressure source, LED light fixture, main control centre MCU respectively, described signal supervisory instrument two ends are connected on LED light fixture and the main control centre MCU, and constant pressure source and constant-current source module provide required electric current for the LED light fixture.Signal supervisory instrument comprises voltage signal checkout gear and current signal checkout gear, described voltage signal checkout gear and the parallel connection of current signal checkout gear.Voltage signal and current signal flow into voltage signal checkout gear and current signal checkout gear respectively after the LED light fixture flows out, after voltage signal checkout gear and the processing of current signal checkout gear, all become stable voltage signal and flow into main control centre MCU, voltage signal is after main control centre MCU handles, produce the PWM modulation signal, the PWM modulation signal flows into the constant-current source module, by the output current of PWM modulation signal control constant-current source module, thus the operating state of control LED lamp.
In conjunction with Fig. 2, be current sensing means feedback circuit schematic diagram, current signal inflow current signal supervisory instrument from the LED outflow, current signal flows into the sample rate current that arrives of sample circuit earlier, sample rate current flows into from CUR-IN, after resistance R 116, enter amplifying circuit, the feedback circuit of amplifying circuit provides feedback signal by resistance R 117 for amplifying circuit, resistance R 118 1 ends are connected with resistance R 117, and other end ground connection is after electric current amplifies by amplifying circuit, be introduced into first rc filter circuit, after resistance R 127 and capacitor C 114 filtering, current signal flows into second rc filter circuit again, after resistance R 128 and capacitor C 113 filtering, obtain galvanic current and press, export to Master Control Center MCU from the CUR end.
In conjunction with Fig. 3, be voltage signal checkout gear schematic diagram, voltage signal flows out the back from the LED light fixture and enters the voltage signal checkout gear from the VOL-IN end, flow into capacitance-resistance pressure drop circuit, after resistance R 103B and capacitor C 101B filtering and voltage-stabiliser tube D23B pressure limiting, flow into resistance R 102B, obtain stable voltage after, flow into main control centre MCU from the VOL end.
Though preferred embodiment of the present invention is disclosed with the purpose as illustration, it will be appreciated by those skilled in the art that various modifications, interpolation and replacement are possible, as long as it does not break away from the spirit and scope of the present invention that describe in detail in the claims.
Claims (7)
1. one kind is utilized the current/voltage feedback to realize the device that the light fixture constant current is controlled, it is characterized in that, comprise constant pressure source, the constant-current source module by regulating exportable constant current, the LED light fixture that constant voltage is provided, signal supervisory instrument, the main control centre MCU that can carry out the current and voltage signals detection, described constant-current source links to each other with civil power, described constant-current source module has three contacts, link to each other with constant pressure source, light fixture, main control centre MCU respectively, described signal supervisory instrument two ends are connected on LED light fixture and the main control centre MCU.
2. device according to claim 1 is characterized in that, described signal supervisory instrument comprises voltage signal checkout gear and current signal checkout gear, described voltage signal checkout gear and the parallel connection of current signal checkout gear.
3. device according to claim 2, it is characterized in that, described current signal checkout gear comprises sample circuit and amplifying circuit, filter circuit, described current signal is flowed through and is obtained sampled signal after the sample circuit sampling, and described sampled signal enters amplifying circuit, and the current signal after the amplification is wave circuit after filtration again, obtain galvanic current and press signal, enter Master Control Center MCU.
4. device according to claim 3 is characterized in that, described filter circuit comprises two rc filter circuits, described two rc filter circuits series connection.
5. device according to claim 2, it is characterized in that, described voltage signal checkout gear comprises capacitance-resistance pressure drop circuit, described capacitance-resistance pressure drop circuit comprises resistance R 103B, capacitor C 101B and voltage-stabiliser tube D23B, and described capacitor C 101B and voltage-stabiliser tube D23B are in parallel to connect with resistance R 103B simultaneously.
6. according to the arbitrary described device of claim 3-5, it is characterized in that the described signal of telecommunication is handled through main control centre MCU and produced the PWM modulation signal later.
7. device according to claim 6 is characterized in that, the PWM modulation signal flows into the constant-current source module, the output current of control constant-current source module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010151462 CN101861012A (en) | 2010-04-20 | 2010-04-20 | Device utilizing current and voltage feedback to realize constant current control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010151462 CN101861012A (en) | 2010-04-20 | 2010-04-20 | Device utilizing current and voltage feedback to realize constant current control |
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| CN101861012A true CN101861012A (en) | 2010-10-13 |
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| CN 201010151462 Pending CN101861012A (en) | 2010-04-20 | 2010-04-20 | Device utilizing current and voltage feedback to realize constant current control |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN102256417A (en) * | 2011-07-12 | 2011-11-23 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN102548083A (en) * | 2010-12-07 | 2012-07-04 | 西安博昱新能源有限公司 | Circuit control system of multiple groups of LED (light-emitting diode) lamps |
| CN102999072A (en) * | 2012-11-27 | 2013-03-27 | 南京普天大唐信息电子有限公司 | Intelligent power supply system capable of quickly adjusting output current/voltage in wide range |
| CN104541575A (en) * | 2012-08-07 | 2015-04-22 | 皇家飞利浦有限公司 | Power supply device |
| CN111741570A (en) * | 2020-07-24 | 2020-10-02 | 武汉精立电子技术有限公司 | Voltage adaptive constant current circuit and calibration device and method |
| WO2021008384A1 (en) * | 2019-07-17 | 2021-01-21 | 深圳市洲明科技股份有限公司 | Power supply feedback adjustment system, and display screen |
| CN112286273A (en) * | 2020-09-28 | 2021-01-29 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
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| EP1429584A2 (en) * | 1997-04-24 | 2004-06-16 | Incerti & Simonini di Incerti Edda & C. S.n.c. | Control circuit governing functioning of the led of a low-tension lighting device |
| CN2899372Y (en) * | 2006-03-17 | 2007-05-09 | 昆明新长江信息产业有限公司 | Urban electric LED illuminating driver |
| 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 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1429584A2 (en) * | 1997-04-24 | 2004-06-16 | Incerti & Simonini di Incerti Edda & C. S.n.c. | Control circuit governing functioning of the led of a low-tension lighting device |
| CN2899372Y (en) * | 2006-03-17 | 2007-05-09 | 昆明新长江信息产业有限公司 | Urban electric LED illuminating driver |
| 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 |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548083A (en) * | 2010-12-07 | 2012-07-04 | 西安博昱新能源有限公司 | Circuit control system of multiple groups of LED (light-emitting diode) lamps |
| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN102186288B (en) * | 2011-04-08 | 2015-07-08 | 浙江萤尔光电科技有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN102256417A (en) * | 2011-07-12 | 2011-11-23 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN102256417B (en) * | 2011-07-12 | 2013-12-18 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN104541575A (en) * | 2012-08-07 | 2015-04-22 | 皇家飞利浦有限公司 | Power supply device |
| CN104541575B (en) * | 2012-08-07 | 2017-02-22 | 皇家飞利浦有限公司 | power distribution system |
| CN102999072A (en) * | 2012-11-27 | 2013-03-27 | 南京普天大唐信息电子有限公司 | Intelligent power supply system capable of quickly adjusting output current/voltage in wide range |
| WO2021008384A1 (en) * | 2019-07-17 | 2021-01-21 | 深圳市洲明科技股份有限公司 | Power supply feedback adjustment system, and display screen |
| CN111741570A (en) * | 2020-07-24 | 2020-10-02 | 武汉精立电子技术有限公司 | Voltage adaptive constant current circuit and calibration device and method |
| CN112286273A (en) * | 2020-09-28 | 2021-01-29 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
| CN112286273B (en) * | 2020-09-28 | 2021-11-19 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
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Application publication date: 20101013 |