CN112886811A - LED driving power supply capable of automatically correcting power factor - Google Patents
LED driving power supply capable of automatically correcting power factor Download PDFInfo
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- CN112886811A CN112886811A CN202110213754.5A CN202110213754A CN112886811A CN 112886811 A CN112886811 A CN 112886811A CN 202110213754 A CN202110213754 A CN 202110213754A CN 112886811 A CN112886811 A CN 112886811A
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- led driving
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 238000002955 isolation Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/08—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
本发明涉及LED驱动电源技术领域，具体涉及一种自动校正功率因数的LED驱动电源；本发明包括整流模块、PFC控制模块、DC‑DC变换模块、温度补偿模块、采样模块、驱动隔离模块和DSP控制器；整流模块、PFC控制模块和DC‑DC变换模块依次电连接，整流模块的输入端电连接有交流电源，DC‑DC变换模块的输出端电连接有LED负载，整流模块输出的电流和DC‑DC变换模块输出的电流分别与DSP控制器上对应的A/D转换通道之间通过电流采样电路电连接，PFC控制模块输出的电压和DC‑DC变换模块输出的电压分别与DSP控制器上对应的A/D转换通道之间通过电压采样电路电连接，温度补偿模块与LED负载负反馈式的连接；本发明能够在LED负载运行时实现对其进行实时功率因数校准的功能。
The invention relates to the technical field of LED driving power supplies, in particular to an LED driving power supply that automatically corrects power factor; the invention comprises a rectifier module, a PFC control module, a DC-DC conversion module, a temperature compensation module, a sampling module, a drive isolation module and a DSP The controller; the rectifier module, the PFC control module and the DC-DC conversion module are electrically connected in sequence, the input end of the rectifier module is electrically connected with the AC power supply, the output end of the DC-DC conversion module is electrically connected with the LED load, and the output current of the rectifier module is The current output by the DC-DC conversion module is electrically connected to the corresponding A/D conversion channel on the DSP controller through a current sampling circuit, and the voltage output by the PFC control module and the voltage output by the DC-DC conversion module are respectively connected to the DSP controller. The corresponding A/D conversion channels are electrically connected through a voltage sampling circuit, and the temperature compensation module is connected with the LED load in a negative feedback manner; the invention can realize the function of real-time power factor calibration when the LED load is running.
Description
Technical Field
The invention relates to the technical field of LED driving power supplies, in particular to an LED driving power supply capable of automatically correcting a power factor.
Background
The LED lighting system is a novel lighting source system, has the advantages of remarkable energy conservation and emission reduction, and has comprehensively replaced the traditional light source. In LED lighting systems, the performance and efficiency of their driving power supplies is critical. The power factor of the LED driving power supply is an important index when the LED driving power supply is actually operated, because the power factor determines the actual effective power of the LED load driven by the LED driving power supply, and the load with low power factor may cause pollution to the power transmission network, especially when the number of the LED loads with unqualified power factors is large.
Therefore, there is a need for a device capable of performing real-time automatic calibration on the power factor of an LED load when the LED load is running, so as to improve the effective utilization rate of the LED load on electric energy and reduce pollution to a power transmission network.
Disclosure of Invention
The present invention is directed to solving the problems of the prior art, and the problems set forth in the background above.
In order to achieve the purpose, the invention adopts the following technical scheme:
an LED driving power supply capable of automatically correcting power factors comprises a rectifying module, a PFC control module, a DC-DC conversion module, a temperature compensation module, a sampling module, a driving isolation module and a DSP controller; the rectifier module, the PFC control module and the DC-DC conversion module are electrically connected in sequence, the input end of the rectifier module is electrically connected with an alternating current power supply, the output end of the DC-DC conversion module is electrically connected with an LED load, the sampling module comprises a current sampling circuit and a voltage sampling circuit, the current output by the rectifier module and the current output by the DC-DC conversion module are respectively and electrically connected with the corresponding A/D conversion channel on the DSP controller through the current sampling circuit, the voltage output by the PFC control module and the voltage output by the DC-DC conversion module are respectively and electrically connected with the corresponding A/D conversion channel on the DSP controller through the voltage sampling circuit, the DSP controller drives the PWM module to respectively output and feed back to the PFC control module and the DC-DC conversion module through the optical coupling driving isolation circuit, and the temperature compensation module is connected with the LED load in a negative feedback manner.
Furthermore, the rectifier module adopts a bridge rectifier circuit.
Furthermore, the PFC control module adopts a boost topology, and comprises an inductor, a triode, a diode, a capacitor and a resistor.
Furthermore, the DC-DC conversion module adopts a converter with an electrically isolated flyback topological structure, and comprises a transformer, wherein a triode is arranged on the primary side of the transformer, and a diode, a capacitor and a resistor are arranged on the secondary side of the transformer.
Furthermore, the temperature compensation module comprises a temperature sensitive resistor, an adjustable resistor, an operational amplifier, two resistors and a starting resistor.
Furthermore, the optical coupling drive isolation circuit comprises an optical coupling isolator, a capacitor, a diode, a triode, a transformer and four resistors.
Further, the optocoupler isolator is model TLP 718F.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, through the addition of the rectifying module, the PFC control module and the DC-DC conversion module, the input end of the current module is electrically connected with an alternating current power supply, the output end of the DC-DC conversion module is electrically connected with an LED load, and the current output by the rectifying module and the current output by the DC-DC conversion module are respectively and electrically connected with the corresponding A/D conversion channel on the DSP controller through the current sampling circuit. The voltage output by the PFC control module and the voltage output by the DC-DC conversion module are respectively and electrically connected with a corresponding A/D conversion channel on the DSP controller through a voltage sampling circuit, the DSP controller drives the PWM module through the optical coupler driving isolation circuit to respectively output and feed back to the PFC control module and the DC-DC conversion module, and the temperature compensation module and the LED load are in a negative feedback type connection design. The invention can automatically calibrate the real-time factor of the running LED load power, thereby improving the effective utilization rate of the LED load to the electric energy and reducing the pollution effect to the power transmission network.
Drawings
FIG. 1 is a block diagram of the control principle of the present invention;
FIG. 2 is a circuit schematic of the rectifier module of the present invention;
fig. 3 is a schematic circuit diagram of the PFC control module of the present invention;
FIG. 4 is a circuit schematic of the DC-DC conversion module of the present invention;
FIG. 5 is a schematic circuit diagram of a temperature compensation module of the present invention;
FIG. 6 is a circuit schematic of the drive isolation module of the present invention;
illustration of the drawings:
1-a rectifying module; 2-PFC control module; a 3-DC-DC conversion module; 4-a temperature compensation module; 5-a sampling module; 6-driving the isolation module; 7-a DSP controller; 8-alternating current power supply; 9-LED load; 10-a current sampling circuit; 11-a voltage sampling circuit; 12-PWM module.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
An LED driving power supply capable of automatically correcting power factor according to this embodiment is described with reference to fig. 1 to 6: the device comprises a rectification module 1, a PFC control module 2, a DC-DC conversion module 3, a temperature compensation module 4, a sampling module 5, a drive isolation module 6 and a DSP controller 7; the rectifying module 1, the PFC control module 2 and the DC-DC conversion module 3 are electrically connected in sequence, the input end of the rectifying module 1 is electrically connected with an alternating current power supply 8, the output end of the DC-DC conversion module 3 is electrically connected with an LED load 9, the sampling module 5 comprises a current sampling circuit 10 and a voltage sampling circuit 11, the current output by the rectifying module 1 and the current output by the DC-DC conversion module 3 are respectively and electrically connected with a corresponding A/D conversion channel on the DSP controller 7 through the current sampling circuit 10, the voltage output by the PFC control module 2 and the voltage output by the DC-DC conversion module 3 are respectively and electrically connected with a corresponding A/D conversion channel on the DSP controller 7 through the voltage sampling circuit 11, the DSP controller 7 drives the PWM module 12 through an optical coupling driving isolation circuit to respectively output and feed back to the PFC control module 2 and the DC-DC conversion module 3, the temperature compensation module 4 is connected with the LED load 9 in a negative feedback mode.
The rectification module 1 adopts a bridge rectification circuit; because it has the advantages of being beneficial to filtering, high in rectification efficiency, small in transformer size (no need of taps), low in cost and the like.
The PFC control module 2 adopts a boost topological structure, and the PFC control module 2 comprises an inductor, a triode, a diode, a capacitor and a resistor; because the inductance in series is connected in the input end of the boost (boost) topological structure, the control of the input current can be more convenient, and the boost (boost) topological structure also has the following advantages: (1) the input current is equal to the inductive current, a high power factor can be obtained, and the THD value is small; (2) the structure is simple; (3) the converter efficiency is high, etc.
The DC-DC conversion module 3 adopts a converter with an electrically isolated flyback topological structure, the DC-DC conversion module 3 comprises a transformer, a triode is arranged on the primary side of the transformer, and a diode, a capacitor and a resistor are arranged on the secondary side of the transformer; because it has the advantages of high safety, strong reliability, low cost and the like.
The temperature compensation module 4 comprises a temperature sensitive resistor, an adjustable resistor, an operational amplifier, two resistors and a starting resistor.
The optical coupling driving isolation circuit comprises an optical coupling isolator, a capacitor, a diode, a triode, a transformer and four resistors; this is because the driving capability of the PWM module 12 sending the PWM signal from the DSP controller 7 is too weak, and a switching tube driving circuit needs to be added between the DSP controller 7 and the MOSFET power switching tube to help drive the switching tube to operate. The drive circuit selects an isolation drive mode.
The opto-coupler isolator is model TLP718F because it has the ability to function normally at temperatures ranging from-40 ℃ to 100 ℃.
The working principle is as follows:
in the present embodiment, the ac power supply 8 uses 200v (ac) and f =50HZ commercial power.
Firstly, the rectification module 1 rectifies the AC voltage input by the AC power supply 8 to obtain the DC power needed by the subsequent LED power supply DC conversion circuit,
secondly, the front-stage PFC control module 2 circuit is used for voltage conversion and power factor correction,
and thirdly, the direct current processed by the PFC module in the second step is further converted into low-voltage direct current voltage required by the LED through a DC-DC conversion module 3.
Fourthly, the inductive current i of the processing module is sampled by a sampling circuitzOutput voltage upfcAnd an output current i of the DC-DC conversion module 3oOutput voltage uoSampling and conditioning the signals;
fifthly, the processed sampling signal is sent to an A/D conversion channel inside the DSP controller 7 and converted into a digital signal, and the DSP controller 7 carries out calculation processing;
sixthly, after the digital signal is regulated by the voltage loop and the current loop PI, the updated comparison value is input into a comparison register of the DSP in real time to determine the duty ratio of the PWM waveform, so that the purpose of updating the PWM waveform output in real time is achieved, and the digital control of a front-stage PFC control module 2 and a rear-stage DC-DC conversion module 3 in the LED driving power supply is realized;
it is worth noting that, because the driving power supply of the LED is designed as a constant current source which does not change with temperature, when the ambient temperature of the LED load 9 is lower than the safe temperature point, the maximum allowable current is output and kept unchanged; when the temperature around the LED load 9 is above the safety temperature point, the operating current is not in the safety zone, which results in a performance of the LED load 9 that is much lower than the nominal value. If the temperature around the LED load 9 is too high, it is caused by the LED load 9 itself generating heat, so in order to ensure that the performance and lifetime of the LED load 9 are not affected, this problem must be solved by the compensation function of the temperature compensation module 4.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213754.5A CN112886811A (en) | 2021-02-26 | 2021-02-26 | LED driving power supply capable of automatically correcting power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213754.5A CN112886811A (en) | 2021-02-26 | 2021-02-26 | LED driving power supply capable of automatically correcting power factor |
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| Publication Number | Publication Date |
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| CN112886811A true CN112886811A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110213754.5A Withdrawn CN112886811A (en) | 2021-02-26 | 2021-02-26 | LED driving power supply capable of automatically correcting power factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115955123A (en) * | 2023-03-13 | 2023-04-11 | 深圳市高斯宝电气技术有限公司 | Control method of CRM-PFC flyback converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080113947A (en) * | 2007-06-26 | 2008-12-31 | 주식회사 우영 | Power supply and LED lighting device having the same |
| CN201422183Y (en) * | 2009-05-26 | 2010-03-10 | 郑州光华灯具有限公司 | High-power LED lamp drive device |
| CN101834541A (en) * | 2010-06-02 | 2010-09-15 | 英飞特电子（杭州）有限公司 | Constant current circuit with high power factor |
| CN104993690A (en) * | 2015-08-10 | 2015-10-21 | 电子科技大学 | Full digit single period power factor correction circuit based on triangular wave pulse modulation |
| CN212064446U (en) * | 2020-05-26 | 2020-12-01 | 四川长虹电子部品有限公司 | Constant-voltage LED driving power supply circuit with temperature compensation and limited power output |
-
2021
- 2021-02-26 CN CN202110213754.5A patent/CN112886811A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080113947A (en) * | 2007-06-26 | 2008-12-31 | 주식회사 우영 | Power supply and LED lighting device having the same |
| CN201422183Y (en) * | 2009-05-26 | 2010-03-10 | 郑州光华灯具有限公司 | High-power LED lamp drive device |
| CN101834541A (en) * | 2010-06-02 | 2010-09-15 | 英飞特电子（杭州）有限公司 | Constant current circuit with high power factor |
| CN104993690A (en) * | 2015-08-10 | 2015-10-21 | 电子科技大学 | Full digit single period power factor correction circuit based on triangular wave pulse modulation |
| CN212064446U (en) * | 2020-05-26 | 2020-12-01 | 四川长虹电子部品有限公司 | Constant-voltage LED driving power supply circuit with temperature compensation and limited power output |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115955123A (en) * | 2023-03-13 | 2023-04-11 | 深圳市高斯宝电气技术有限公司 | Control method of CRM-PFC flyback converter |
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Application publication date: 20210601 |