CN112886811A - LED driving power supply capable of automatically correcting power factor - Google Patents

LED driving power supply capable of automatically correcting power factor Download PDF

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Publication number
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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CN
China
Prior art keywords
module
power supply
conversion
electrically connected
pfc control
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Pending
Application number
CN202110213754.5A
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Chinese (zh)
Inventor
华前斌
华涛
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Tongling Maxwell Technology Co ltd
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Tongling Maxwell Technology Co ltd
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Application filed by Tongling Maxwell Technology Co ltd filed Critical Tongling Maxwell Technology Co ltd
Priority to CN202110213754.5A priority Critical patent/CN112886811A/en
Publication of CN112886811A publication Critical patent/CN112886811A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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

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; the device comprises a rectification module, a PFC control module, a DC-DC conversion module, a temperature compensation module, a sampling module, a drive 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 current output by the rectifier module and the current 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 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, and the temperature compensation module is in negative feedback connection with the LED load; the invention can realize the function of real-time power factor calibration of the LED load when the LED load runs.

Description

LED driving power supply capable of automatically correcting power factor
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)

1. An LED driving power supply capable of automatically correcting power factor is characterized in that: 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 rectifier module (1), the PFC control module (2) and the DC-DC conversion module (3) are electrically connected in sequence, the input end of the rectifier 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 rectifier 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) to output and feed back to the PFC control module (2) and the DC-DC conversion module (3) through the driving isolation module (6), and the temperature compensation module (4) is connected with the LED load (9) in a negative feedback mode.
2. The LED driving power supply capable of automatically correcting the power factor according to claim 1, wherein the rectifying module (1) adopts a bridge rectifying circuit.
3. The LED driving power supply capable of automatically correcting the power factor as claimed in claim 1, wherein the PFC control module (2) adopts a boost topology, and the PFC control module (2) comprises an inductor, a transistor, a diode, a capacitor and a resistor.
4. The power factor auto-correcting LED driving power supply according to claim 1, wherein the DC-DC conversion module (3) is a converter with an electrically isolated flyback topology, the DC-DC conversion module (3) comprises a transformer, a transistor is disposed on a primary side of the transformer, and a diode, a capacitor and a resistor are disposed on a secondary side of the transformer.
5. The LED driving power supply capable of automatically correcting the power factor according to claim 1, wherein the temperature compensation module (4) comprises a temperature sensitive resistor, an adjustable resistor, an operational amplifier, two resistors and a starting resistor.
6. The LED driving power supply capable of automatically correcting the power factor is characterized in that the driving isolation module (6) comprises an optical coupling isolator, a capacitor, a diode, a triode, a transformer and four resistors.
7. The LED driving power supply capable of automatically correcting the power factor as claimed in claim 6, wherein the type of the optocoupler isolator is TLP718F, which can normally work in a temperature range of-40 ℃ to 100 ℃.
CN202110213754.5A 2021-02-26 2021-02-26 LED driving power supply capable of automatically correcting power factor Pending CN112886811A (en)

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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CN112886811A true CN112886811A (en) 2021-06-01

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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