CN102858064A - LED (light emitting diode) centralized drive power parallel system - Google Patents
LED (light emitting diode) centralized drive power parallel system Download PDFInfo
- Publication number
- CN102858064A CN102858064A CN2012103121329A CN201210312132A CN102858064A CN 102858064 A CN102858064 A CN 102858064A CN 2012103121329 A CN2012103121329 A CN 2012103121329A CN 201210312132 A CN201210312132 A CN 201210312132A CN 102858064 A CN102858064 A CN 102858064A
- Authority
- CN
- China
- Prior art keywords
- unit
- current
- output
- led
- driving power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an LED (light emitting diode) centralized drive power parallel system which comprises more than one independent power module, more than one LED drive power unit and a monitoring unit, wherein the AC (alternating current) mains supply is converted by the independent power module and converged by a parallel bus and output to each LED drive power unit; the LED drive power unit drives an LED lamp group; and the monitoring unit detects the input current of each LED drive power unit, averages the input current and outputs the average to each independent power module to control the work of each independent power module. The system disclosed by the invention adopts a centralized control system and scattered LED drive control mode, namely that the centralized control increases the system power by use of an AC/DC module N+1 parallel mode, and then the power is scattered to each LED drive to supply power. According to the invention, the duty cycle of the power is adjusted by directly adding current detection to the controlled double closed-loop system so as to realize automatic current equalization of the module; and compared with the traditional current equalizing technology, the system is simple and practical, and the current equalizing effect is good.
Description
Technical field
The present invention discloses a kind of LED driving power source system, particularly a kind of LED centralized driving power parallel machine system.
Background technology
Along with the development of LED lighting technology, LED is more and more extensive in the application of people's daily life, the thing followed, and the LED driving power has also obtained very large development.The LED street lamp normally adopts the pattern of centrally connected power supply; a power supply box is concentrated and by bus many groups LED is powered; yet in actual use; usually can produce; the shortcomings such as current-unbalance of many group LED driver modules, LED driving power efficient is low, the life-span is short, the high in cost of production problem thereby cause.
Summary of the invention
Low for the above-mentioned LED driving power efficient of the prior art of mentioning, the life-span is short, the high in cost of production problem, the invention provides a kind of new LED centralized driving power parallel machine system, it adopts central controlled N+1 parallel operation to power to improve system power, and then power disperse is supplied with each LED drive to power, thereby the reduction cost increases the service life.
The present invention solves the technical scheme that its technical problem adopts: a kind of LED centralized driving power parallel machine system, this system comprises more than one independent current source module, more than one LED driving power unit and monitoring unit, electric main is after the independent current source module converts, conflux via parallel operation and to export to each LED driving power unit after bus is confluxed, LED driving power unit drives LED lamp group, monitoring unit detects the input current of each LED driving power unit, export to each independent current source module after averaging, control each independent current source module work.
The technical scheme that the present invention solves its technical problem employing further comprises:
Described independent current source module comprises AC/DC power conversion unit, the PWM control unit, the MCU control unit, output current sampling unit and Double closed-loop of voltage and current unit, external AC is inputted the PWM control unit after AC-DC conversion, then after the conversion of PWM control unit, after exporting to again AC/DC power conversion unit and changing into direct current, export to the parallel operation bus of confluxing, the output current of output current sampling unit sampling DC output unit, the output sampled signal is to monitoring unit, monitoring unit output control signal is to the PWM control unit, control its work, Double closed-loop of voltage and current unit sample respectively output current and the output voltage of DC output unit, after current adjustment unit and voltage-adjusting unit adjustment, export to the PWM control unit, control its work.
Described independent current source module also comprises protection relay, and AC/DC power conversion unit output DC is transferred to the parallel operation bus of confluxing through protection relay, the work of MCU control unit control protection relay.
Described AC/DC power conversion unit comprises full-bridge converter unit and DC output unit, and PWM control unit output AC electricity carries out AC-DC conversion through the full-bridge converter unit, and then exports to the parallel operation bus of confluxing through the DC output unit.
Described Double closed-loop of voltage and current unit comprises outer voltage control ring and current inner loop control ring, AC/DC power conversion unit output input voltage outer shroud control ring behind the voltage sample electric resistance partial pressure, after comparing with the VADJ signal of MCU control unit output, export to the current inner loop control ring, the current inner loop control ring is exported in the output of AC/DC power conversion unit after current sampling resistor carries out current sample, the work of current inner loop control ring output control PWM control unit.
Described outer voltage control ring adopts amplifier U1D, and sampled voltage signal and VADJ signal are inputted the inverting input of amplifier U1D simultaneously, and the in-phase input end of amplifier U1D is by resistance R 15 ground connection.
Described current inner loop control ring adopts amplifier U1B, and sample rate current signal and outer voltage control ring output signal are inputted the inverting input of amplifier U1B simultaneously, and the in-phase input end of amplifier U1B is by resistance R 7 ground connection.
Described independent current source module also comprises the sharing control ring, the sharing control ring is exported in the output of AC/DC power conversion unit after current sampling resistor carries out current sample, compare the work of output control PWM control unit with the input current average value of each LED driving power unit of monitoring unit output.
Described sharing control ring adopts amplifier U1C, the inverting input of sample rate current signal input amplifier U1C, the in-phase input end of the input current average value input amplifier U1C of each LED driving power unit of monitoring unit output.
Be connected with comparison resistance R29 between described amplifier U1C in-phase input end and the inverting input.
The invention has the beneficial effects as follows: the present invention adopts centralized control system+dispersion LED to drive control model, and namely centralized control utilizes AC/DC module N+1 parallel operation to improve system power, and then disperses each LED of supply to drive to power power.The present invention directly increases current detecting and comes the regulating power duty ratio to make module realize automatic current equalizing in the double loop system of control, compare with traditional flow equalize technology, and the method is simple and practical, and current-sharing is respond well.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is system block diagram of the present invention.
Fig. 2 is modular unit block diagram of the present invention.
Fig. 3 is modular circuit schematic diagram of the present invention.
Fig. 4 is module application circuit theory diagrams of the present invention.
Fig. 5 is system simplification circuit theory diagrams of the present invention.
Fig. 6 is application circuit schematic diagram of the present invention.
Fig. 7 is circuit system schematic diagram of the present invention.
Embodiment
The present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with the present embodiment or approximate with basic structure, all within protection range of the present invention.
Please mainly comprise more than one independent current source module, more than one LED driving power unit and monitoring unit referring to accompanying drawing 1 the present invention, after more than one independent current source module converts external electric main to direct current, conflux through parallel operation and to export to each LED driving power unit after bus is confluxed, respectively drive one group of LED lamp through LED driving power unit.Please referring to accompanying drawing 2 and accompanying drawing 3; among the present invention; independently power module mainly comprises AC/DC power conversion unit; the PWM control unit; MCU control unit (not shown in FIG.); the output current sampling unit; protection relay; Double closed-loop of voltage and current unit and sharing control unit; in the present embodiment; AC/DC power conversion unit mainly comprises full-bridge converter unit and DC output unit; external AC is inputted the PWM control unit after AC-DC conversion; after the conversion of PWM control unit; export to again the full-bridge converter unit and carry out AC-DC conversion; and then after changing into direct current through the DC output unit; export to the parallel operation bus of confluxing through protection relay; give the power supply of LED driving power unit; the output current of output current sampling unit sampling DC output unit; the output sampled signal is to the sharing control unit; sharing control unit output control signal is to the PWM control unit; control its work; Double closed-loop of voltage and current unit sample respectively output current and the output voltage of DC output unit; after current adjustment unit and voltage-adjusting unit adjustment, export to the PWM control unit; control its work, the work of MCU control unit protection relay.When short circuit appears in bus, system detects the protection relay that disconnects immediately all independent current source modules behind the fault-signal, in the present embodiment, detect the current value of sampling by monitoring unit, when the current value of sampling occurs when unusual, then be judged as and break down, notify out of order independent current source module, parting system by the RS-485 interface; Break down when system detects certain module, immediately this independent current source module is disconnected, can not affect like this normal operation of system, guaranteed the fail safe of each module.This parallel technology can satisfy the sharing control of system just with a little correct of working control loop.Please in conjunction with referring to accompanying drawing 3 to accompanying drawing 7, in the present embodiment, take one group of independent current source module as example, circuit theory of the present invention is specifically described, during implementation, N road independent current source module can be set according to actual needs, among the present invention, independently system module comprises that the AC/DC high frequency switch power (mainly comprises AC/DC power conversion unit and PWM control unit, these two unit can adopt conventional high frequency switch power structure), output current sampling resistor R1, sampling resistor R2, the Control loop of protection relay K1 and electric current and voltage, resistance R 5 wherein, resistance R 3 is connected in series the divider resistance into the power module output voltage, the VADJ signal is that (set-point VADJ can determine according to the output voltage of reality for the set-point of output voltage, usually choose VADJ=5V), in the present embodiment, the VADJ signal is exported by the MCU control unit, amplifier U1D is the voltage control loop core parts, the main amplifier U1D of outer voltage control ring, resistance R 4, resistance R 15, capacitor C 3, capacitor C 4 and resistance R 12 form (please referring to accompanying drawing 3), VADJ signal and resistance R 5, the voltage division signal of resistance R 3 is inputted respectively the inverting input of amplifier U1D, the in-phase input end of amplifier U1D is by resistance R 15 ground connection, the voltage control loop output signal is given output amplifier U1B, amplifier U1B is the current regulator core parts, the current inner loop control ring mainly comprises amplifier U1B, capacitor C 1, capacitor C 2, resistance R 6, resistance R 10, resistance R 11 and resistance R 7 form (please referring to accompanying drawing 3), as the given value of current reference value, the voltage control loop output signal is exported to current regulator U1B; Sampling resistor R1 and sampling resistor R2 are connected in parallel, output current by sampling resistor R1 and sampling resistor R2 sampling module, and sampled signal inputed to the inverting input of amplifier U1B and the inverting input of amplifier U1C, the in-phase input end of amplifier U1B is by resistance R 7 ground connection, the in-phase input end of amplifier U1C connects the I_AV signal, amplifier U1C, resistance R 8, resistance R 9 and resistance R 29 consist of the sharing control ring, and resistance R 29 is the comparison resistance between the mean value I_AV of individual module output current and N parallel operation module output current; The I_AV signal is the average current value of N parallel operation module, the sample rate current input monitoring unit of each independent current source module, after monitoring unit calculates average current value, output I_AV signal, in the present embodiment, parallel operation module (being the independent current source module) output current value is delivered to monitoring unit and is done average computation, the output current of current average and each parallel operation module compares, if the pressure drop between the two comparison resistance value is zero, illustrate that this module has reached current-sharing, when the ohmically pressure drop of the comparison value of the two is non-vanishing, illustrate that this blocks current has deviation, with the two the difference current output terminal that is added to, remove to change output current by the PWM control unit Modulating Power duty ratio of this module, make it reach current-sharing.Be connected with resistance R 29 between the in-phase input end of amplifier U1C and the inverting input, resistance R 29 is module output current and total current mean value comparison resistance, amplifier U1C is the electric current comparator/operational amplifier, with the value of current ratio after the Current Control output that is added to, goes to regulate duty ratio.Control loop among the present invention adopts two closed-loop controls, ring is the output current control ring in it, outer shroud is the output voltage control ring, the set-point of voltage is the given reference value of actual output voltage, and the output of voltage is controlled to be the reference set-point of electric current, and whole like this power-supply system has guaranteed constant output voltage and electric current by two closed-loop controls.
Operation principle of the present invention is as follows:
Two closed loop operation principles: the single module output voltage is by sampling divider resistance R5, the value of feedback of resistance R 3 and voltage given value VADJ more afterwards by PI(by resistance R 12, capacitor C 3, capacitor C 4 compositions) control ring is controlled output voltage, after adjusting, as the set-point of current inner loop and output current sampling value more afterwards by PI(by resistance R 6, capacitor C 1, capacitor C 2 compositions) control ring is controlled output current, after adjusting, remove to adjust the PWM control unit, drive the full-bridge conversion, voltage and current double closed-loop has guaranteed constant output voltage and electric current like this.
The flow equalizing ring operation principle: the single module output current compares the mean value I_AV that current value becomes magnitude of voltage and N parallel operation module output current by sampling resistor R1, wherein comparison resistance is resistance R 29, when output current value equates with mean value I_AV, the magnitude of voltage at comparison resistance R29 two ends is 0, proves this module current-sharing; When output current value and mean value I_AV are unequal, the magnitude of voltage at comparison resistance R29 two ends is for or not 0, prove this not current-sharing of module, with mean value certain error amount is arranged, this error output electric current output ring that directly is added to removes to adjust the PWM control unit, and the value of controlling to adjust output current by PWM reaches the purpose of current-sharing.
The N+1 redundant parallel module that adopts among the present invention is (in the present embodiment, adopt N+1 road independent current source module, during work, only have N independent current source module to carry out work, remaining of getting off is as backup, when certain independent current source module has fault, can not affect the normal operation of system) design mainly for present street lamp centralized control, deliver to monitoring unit after each parallel operation module output current value sampling and do average computation, the output current of calculated value and each parallel operation module compares (such as IO1 and I_AV), if the pressure drop between the two comparison resistance R29 is zero, illustrate that this module has reached current-sharing, when the voltage on the comparison resistance R29 of the two is non-vanishing, illustrate that this blocks current has deviation, with the two the difference current output terminal that is added to, adjust pwm control circuit and go to change the effect that output current value reaches current-sharing.Can parallel operation N independent current source module on this Systems Theory, power to load centralization.
The present invention adopts centralized control system+dispersion LED to drive control model, and namely centralized control utilizes AC/DC module N+1 parallel operation to improve system power, and then disperses each LED of supply to drive to power power.The present invention directly increases current detecting and comes the regulating power duty ratio to make module realize automatic current equalizing in the double loop system of control, compare with traditional flow equalize technology, and the method is simple and practical, and current-sharing is respond well.
Claims (10)
1. LED centralized driving power parallel machine system, it is characterized in that: described system comprises more than one independent current source module, more than one LED driving power unit and monitoring unit, electric main is after the independent current source module converts, conflux via parallel operation and to export to each LED driving power unit after bus is confluxed, LED driving power unit drives LED lamp group, monitoring unit detects the input current of each LED driving power unit, export to each independent current source module after averaging, control each independent current source module work.
2. LED centralized driving power parallel machine according to claim 1 system, it is characterized in that: described independent current source module comprises AC/DC power conversion unit, the PWM control unit, the MCU control unit, output current sampling unit and Double closed-loop of voltage and current unit, external AC is inputted the PWM control unit after AC-DC conversion, then after the conversion of PWM control unit, after exporting to again AC/DC power conversion unit and changing into direct current, export to the parallel operation bus of confluxing, the output current of output current sampling unit sampling DC output unit, the output sampled signal is to monitoring unit, monitoring unit output control signal is to the PWM control unit, control its work, Double closed-loop of voltage and current unit sample respectively output current and the output voltage of DC output unit, after current adjustment unit and voltage-adjusting unit adjustment, export to the PWM control unit, control its work.
3. LED centralized driving power parallel machine according to claim 2 system; it is characterized in that: described independent current source module also comprises protection relay; AC/DC power conversion unit output DC is transferred to the parallel operation bus of confluxing through protection relay, the work of MCU control unit control protection relay.
4. LED centralized driving power parallel machine according to claim 2 system, it is characterized in that: described AC/DC power conversion unit comprises full-bridge converter unit and DC output unit, PWM control unit output AC electricity carries out AC-DC conversion through the full-bridge converter unit, and then exports to the parallel operation bus of confluxing through the DC output unit.
5. LED centralized driving power parallel machine according to claim 2 system, it is characterized in that: described Double closed-loop of voltage and current unit comprises outer voltage control ring and current inner loop control ring, AC/DC power conversion unit output input voltage outer shroud control ring behind the voltage sample electric resistance partial pressure, after comparing with the VADJ signal of MCU control unit output, export to the current inner loop control ring, the current inner loop control ring is exported in the output of AC/DC power conversion unit after current sampling resistor carries out current sample, the work of current inner loop control ring output control PWM control unit.
6. LED centralized driving power parallel machine according to claim 5 system, it is characterized in that: described outer voltage control ring adopts amplifier U1D, sampled voltage signal and VADJ signal are inputted the inverting input of amplifier U1D simultaneously, and the in-phase input end of amplifier U1D is by resistance R 15 ground connection.
7. LED centralized driving power parallel machine according to claim 5 system, it is characterized in that: described current inner loop control ring adopts amplifier U1B, sample rate current signal and outer voltage control ring output signal are inputted the inverting input of amplifier U1B simultaneously, and the in-phase input end of amplifier U1B is by resistance R 7 ground connection.
8. LED centralized driving power parallel machine according to claim 2 system, it is characterized in that: described independent current source module also comprises the sharing control ring, the sharing control ring is exported in the output of AC/DC power conversion unit after current sampling resistor carries out current sample, compare the work of output control PWM control unit with the input current average value of each LED driving power unit of monitoring unit output.
9. LED centralized driving power parallel machine according to claim 8 system, it is characterized in that: described sharing control ring adopts amplifier U1C, the inverting input of sample rate current signal input amplifier U1C, the in-phase input end of the input current average value input amplifier U1C of each LED driving power unit of monitoring unit output.
10. LED centralized driving power parallel machine according to claim 9 system is characterized in that: be connected with comparison resistance R29 between described amplifier U1C in-phase input end and the inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103121329A CN102858064A (en) | 2012-08-29 | 2012-08-29 | LED (light emitting diode) centralized drive power parallel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103121329A CN102858064A (en) | 2012-08-29 | 2012-08-29 | LED (light emitting diode) centralized drive power parallel system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102858064A true CN102858064A (en) | 2013-01-02 |
Family
ID=47404155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103121329A Pending CN102858064A (en) | 2012-08-29 | 2012-08-29 | LED (light emitting diode) centralized drive power parallel system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102858064A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119264A (en) * | 2015-10-23 | 2015-12-02 | 国网天津市电力公司 | A DC distribution system layered current-sharing control method based on a Matlab |
| CN107466143A (en) * | 2017-09-15 | 2017-12-12 | 佛山市华全电气照明有限公司 | The control system of parallel redundancy power supply |
| CN111050443A (en) * | 2019-12-27 | 2020-04-21 | 江苏玖盛电器有限公司 | Centralized power supply dimming control system for lighting lamps in passenger room of high-speed rail/subway train |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700554A (en) * | 2004-05-19 | 2005-11-23 | 力博特公司 | Power supply system and method for implementing current equalization |
| CN1808829A (en) * | 2005-01-21 | 2006-07-26 | 广西新未来信息产业股份有限公司 | Current-sharing control method and system for parallel modular inverse power supply |
| CN201113787Y (en) * | 2007-09-29 | 2008-09-10 | 山东新风光电子科技发展有限公司 | AC/DC PWM converting circuit and its control device |
| KR20100040242A (en) * | 2008-10-09 | 2010-04-19 | 샤프 가부시키가이샤 | Led drive circuit, led illumination component, led illumination device, and led illumination system |
| CN101867182A (en) * | 2010-05-04 | 2010-10-20 | 浪潮电子信息产业股份有限公司 | Parallel current-sharing power supply |
| CN201616943U (en) * | 2010-02-09 | 2010-10-27 | 浙江金基电子技术有限公司 | Device for energy conversion and energy-saving control of LED streetlamp |
| CN102231261A (en) * | 2011-06-10 | 2011-11-02 | 中航华东光电有限公司 | Drive circuit of LED (light-emitting diode) backlight and control method thereof |
| CN102281013A (en) * | 2011-08-25 | 2011-12-14 | 华南理工大学 | Multi-module parallel power supply device and cooperative control method thereof |
| CN202206616U (en) * | 2011-08-26 | 2012-04-25 | 上海新华电子设备有限公司 | Constant current driving power supply for illumination of Light Emitting Diode (LED) |
| CN202209547U (en) * | 2011-08-17 | 2012-05-02 | 深圳市华彩光电有限公司 | Novel energy-saving LED daylight lamp |
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN102622037A (en) * | 2012-04-10 | 2012-08-01 | 东莞市乐科电子有限公司 | Parallel PFC (Power Factor Correction) rectifying modules and current sharing control method |
-
2012
- 2012-08-29 CN CN2012103121329A patent/CN102858064A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700554A (en) * | 2004-05-19 | 2005-11-23 | 力博特公司 | Power supply system and method for implementing current equalization |
| CN1808829A (en) * | 2005-01-21 | 2006-07-26 | 广西新未来信息产业股份有限公司 | Current-sharing control method and system for parallel modular inverse power supply |
| CN201113787Y (en) * | 2007-09-29 | 2008-09-10 | 山东新风光电子科技发展有限公司 | AC/DC PWM converting circuit and its control device |
| KR20100040242A (en) * | 2008-10-09 | 2010-04-19 | 샤프 가부시키가이샤 | Led drive circuit, led illumination component, led illumination device, and led illumination system |
| CN201616943U (en) * | 2010-02-09 | 2010-10-27 | 浙江金基电子技术有限公司 | Device for energy conversion and energy-saving control of LED streetlamp |
| CN101867182A (en) * | 2010-05-04 | 2010-10-20 | 浪潮电子信息产业股份有限公司 | Parallel current-sharing power supply |
| CN102231261A (en) * | 2011-06-10 | 2011-11-02 | 中航华东光电有限公司 | Drive circuit of LED (light-emitting diode) backlight and control method thereof |
| CN202209547U (en) * | 2011-08-17 | 2012-05-02 | 深圳市华彩光电有限公司 | Novel energy-saving LED daylight lamp |
| CN102281013A (en) * | 2011-08-25 | 2011-12-14 | 华南理工大学 | Multi-module parallel power supply device and cooperative control method thereof |
| CN202206616U (en) * | 2011-08-26 | 2012-04-25 | 上海新华电子设备有限公司 | Constant current driving power supply for illumination of Light Emitting Diode (LED) |
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN102622037A (en) * | 2012-04-10 | 2012-08-01 | 东莞市乐科电子有限公司 | Parallel PFC (Power Factor Correction) rectifying modules and current sharing control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119264A (en) * | 2015-10-23 | 2015-12-02 | 国网天津市电力公司 | A DC distribution system layered current-sharing control method based on a Matlab |
| CN107466143A (en) * | 2017-09-15 | 2017-12-12 | 佛山市华全电气照明有限公司 | The control system of parallel redundancy power supply |
| CN111050443A (en) * | 2019-12-27 | 2020-04-21 | 江苏玖盛电器有限公司 | Centralized power supply dimming control system for lighting lamps in passenger room of high-speed rail/subway train |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102447253B (en) | Direct current switching power supply parallel system current sharing control method and control device | |
| US8981654B2 (en) | LED centralized DC power supply system and operating methods thereof | |
| EP2715904A1 (en) | System and method for integrating and managing demand/response between alternative energy sources, grid power, and loads | |
| CN102548100B (en) | Load driving device and system | |
| CN106936295B (en) | Switching power supply and power supply equipment using same | |
| JP6800353B2 (en) | Lighting power system and method | |
| CN203377675U (en) | Bus station intelligent power supply system characterized by clean energy compensation | |
| CN203352863U (en) | New LED lighting system | |
| CN205040065U (en) | Adjustable output current's constant voltage constant -current drive circuit | |
| CN102858064A (en) | LED (light emitting diode) centralized drive power parallel system | |
| CN103987147B (en) | Determine the light emitting diode illuminating apparatus of power and determine the control method of power output | |
| TWI607667B (en) | Dimmable led with constant voltage plus constant current drive circuitry | |
| WO2019002110A1 (en) | A lighting power supply system and method | |
| CN105281561A (en) | Method for processing merging and current sharing problem of high-power high-frequency power supply | |
| CN107197561B (en) | A kind of LED energy saving light modulator based on DC bus-bar voltage signal | |
| KR102233773B1 (en) | System for converting power and method for controlling the system | |
| CN203206526U (en) | Light-emitting diode (LED) lighting device with certain power | |
| CN203206527U (en) | Stable-power power supply device | |
| CN104602387B (en) | Dummy load circuit | |
| CN204231000U (en) | A kind of high speed power line carrier-specific intelligent power controller | |
| CN204103500U (en) | Public domain energy-saving electricity and terminal intelligent control system | |
| CN203618199U (en) | LED intelligent driver | |
| CN202998559U (en) | Actuator for lighting device and lighting device with the same | |
| CN217213525U (en) | Upper reservoir loop storehouse way industrial television system voltage stabilizing device | |
| CN206077754U (en) | A kind of LED lamp direct current supply control system and its power supply control cabinet and LED lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130102 |