CN113783262A - Charger power feedback regulation and control circuit - Google Patents

Charger power feedback regulation and control circuit Download PDF

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Publication number
CN113783262A
CN113783262A CN202111080150.4A CN202111080150A CN113783262A CN 113783262 A CN113783262 A CN 113783262A CN 202111080150 A CN202111080150 A CN 202111080150A CN 113783262 A CN113783262 A CN 113783262A
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China
Prior art keywords
circuit
voltage
output
regulation
current
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Pending
Application number
CN202111080150.4A
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Chinese (zh)
Inventor
杨亮
李高垒
孙奥
王佳斐
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Huaihai Mechanical And Electronic Technology Co ltd
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Huaihai Mechanical And Electronic Technology Co ltd
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Priority to CN202111080150.4A priority Critical patent/CN113783262A/en
Publication of CN113783262A publication Critical patent/CN113783262A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a charger power feedback regulation and control circuit which comprises an EMI filter circuit, a bridge rectifier filter circuit, a half-bridge converter circuit, a power feedback regulation and control circuit, a transformer circuit, an output filter circuit, an MCU control circuit, a direct current power supply output circuit and the like. The invention realizes the output of the set reference signals with different levels by regulating the duty ratio of the PWM fixed frequency pulse by a program, and enlarges the application range; meanwhile, a power feedback regulation and control circuit is added, and the input pulse voltage semaphore of the transformer circuit is fed back and regulated through the half-bridge converter circuit according to the feedback signal level (0 or 1), so that the purpose of feedback regulation and control of the power output of the charger is achieved.

Description

Charger power feedback regulation and control circuit
Technical Field
The invention relates to a feedback regulation and control circuit, in particular to a charger power feedback regulation and control circuit.
Background
With the popularization and application of new energy technology and new energy batteries, the charging device has multiple power applicability. In different charging modes and different charging devices, the voltage and current for charging the battery need to be adjusted according to the characteristics of the battery, otherwise the energy loss and the service life of the battery are affected. At present, the output power of most chargers is relatively single; in addition, with the popularization of new energy vehicles and the laying of charging piles, no matter a vehicle-mounted charger or a charging pile and a split type charger, feedback regulation and control of power output are necessary, and the application scene is narrow.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a charger power feedback regulation and control circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the power supply circuit comprises an EMI filter circuit, a bridge rectifier filter circuit, a half-bridge converter circuit, a power feedback regulation and control circuit, a transformer circuit, an output filter circuit, an MCU control circuit, a direct current power supply output circuit and the like;
further, the power feedback regulation and control circuit comprises a comparator circuit, an isolation feedback circuit, a constant voltage regulation and control comparator A circuit, a secondary RC filter A circuit, a system setting voltage calibration signal acquisition A circuit, a constant current regulation and control comparator B circuit, a secondary RC filter B circuit, a system setting current calibration signal acquisition B circuit, a voltage clamping circuit of a voltage setting signal and a direct current supply output current signal acquisition circuit,
furthermore, the comparator circuit consists of two operational amplifiers of U1A and U1B; the isolation feedback circuit consists of a U2 optocoupler, a D2 and a D3 Schottky diode; the circuit A of the constant voltage regulation and control comparator consists of a constant voltage regulation and control circuit, a U1A operational amplifier, R1, C1 and C2; the two-stage RC filtering A circuit consists of R7, C4, R8 and C5, the system setting voltage calibration signal acquisition A circuit consists of R6 and C3, and the B circuit of the constant current regulation comparator consists of a constant current regulation circuit, a U1B operational amplifier, R9 and C6; the two-stage RC filtering B circuit consists of R14, C9, R15 and C10; the system setting current calibration signal acquisition B circuit consists of R13 and C11; the voltage clamping circuit of the voltage setting signal consists of D4, R19 and R20; the direct current supply output current signal acquisition circuit is composed of R12 and C8.
Compared with the prior art, the invention has the beneficial effects that:
1. the singlechip regulates the duty ratio of the PWM fixed frequency pulse through a program according to the demand parameters set by the product, realizes the output of set reference signals with different levels, and enlarges the application range.
2. The half-bridge converter circuit feeds back and adjusts the pulse voltage semaphore input by the transformer circuit according to the feedback signal level (0 or 1), thereby realizing the purpose of regulating and controlling the power output of the charger by feedback.
Drawings
FIG. 1 is a block diagram of a power output feedback regulation charger system according to the present invention;
fig. 2 is a schematic diagram of a charger power output feedback regulation circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1, the system mainly comprises an EMI filter circuit, a bridge rectifier filter circuit, a half-bridge converter circuit, a power feedback regulation circuit, a transformer circuit, an output filter circuit, an MCU control circuit, and a dc power supply output circuit. The 220V alternating current voltage is output as direct current voltage about 310V through EMI filtering and bridge rectifier filtering, then the input pulse voltage of the transformer circuit is adjusted through half-bridge conversion circuit conversion, the transformer circuit realizes voltage transformation output according to the input pulse voltage signal and the direction and turn ratio of the transformer coil, and the output filtering circuit realizes relatively smooth direct current voltage output. The power feedback regulation and control circuit collects voltage (such as voltage signal of Vout DC output in figure 1) and current (such as ISENSE _ AMPL in figure 1) output by the DC power supply as output reference signals. The MCU control circuit outputs PWM signals, Vref _ PWM and Iref _ PWM through an IO port of the single chip microcomputer, the PWM signals realize direct-current voltage signal output through two-stage RC filtering and serve as reference signals set by a system, the single chip microcomputer adjusts the duty ratio of PWM fixed-frequency pulses according to required parameters set by a product through a program to realize the output of the set reference signals with different levels, see FIG. 1, the Vref _ PWM is a constant-voltage regulation PWM signal, and the Iref _ PWM is a constant-current regulation PWM signal. The system circuit is additionally provided with a feedback calibration signal acquisition circuit of a reference signal set by a system, as shown in fig. 1, Vref _ calibration is a system setting voltage calibration acquisition signal, Iref _ calibration is a current calibration acquisition signal set by the system, and the MCU control circuit finely adjusts duty ratios of PWM signals output by Vref _ PWM and Iref _ PWM according to Vref _ calibration and Iref _ calibration to accurately set the reference signal in a closed loop. In fig. 1, the ISENSE _ MCU is a current signal output by the dc power supply collected by the MCU, and the single chip microcomputer converts the current signal collected by the ADC into an output current value as a reference for constant current regulation and control current. The power feedback regulation and control circuit compares the collected direct current power supply output reference signals (Vout and ISENSE _ AMPL) with the filtered levels of the reference signals (Vref _ PWM and Iref _ PWM) set by the MCU system, and feeds back the reference signals to the half-bridge conversion circuit through the circuit, as shown in FIG. 1, and Duty _ Ref is a feedback signal of the power feedback regulation and control circuit. The half-bridge converter circuit feeds back and adjusts the pulse voltage semaphore input by the transformer circuit according to the feedback signal level (0 or 1), thereby realizing the purpose of regulating and controlling the power output of the charger by feedback.
As shown IN fig. 2, the constant voltage regulation circuit, U1A operational amplifier, R1, C1 and C2 constitute a constant voltage regulation comparator a circuit, IN fig. 2, VOUT is a voltage signal output by dc power supply, and is divided by R2 and R3 resistors to be used as an input signal of the U1A comparator circuit IN-; IN fig. 2, R7, C4, R8 and C5 form a two-stage RC filter a circuit, so as to filter a constant voltage regulation PWM signal set by a single chip microcomputer and output a dc level signal, which is used as an input signal of a U1A comparator circuit IN +; in fig. 2, R6 and C3 form a system setting voltage calibration signal acquisition a circuit, Vref _ calibration is a system setting voltage calibration acquisition signal, and a single chip microcomputer acquires a calibration signal voltage through an ADC to finely adjust Vref _ PWM, thereby achieving the purpose of accurately setting a reference signal in a closed loop. In fig. 2, D1, R4 and R5 constitute a voltage clamping circuit of a voltage setting signal, so that an uncertain level is protected in an MCU runaway state, and values of R4 and R5 are changed according to design requirements to change a clamping voltage value. When the input signal level of the U1A comparator circuit IN-is higher than the input signal level of IN +, D2 is conducted, the optical coupler works and is conducted, and the Duty _ Ref signal is pulled low; otherwise, D2 is cut off, the optical coupler is turned off, the Duty _ Ref signal is disconnected and suspended, and the PWM converter circuit regulates the power output of the transformer according to the feedback signal.
As shown IN fig. 2, the constant current regulation and control circuit, U1B operational amplifier, R9 and C6, form a constant current regulation and control comparator circuit B, IN fig. 2, ISENSE _ AMPL converts a current signal output by direct current power supply into an amplified signal of voltage, and inputs the signal through a resistor R11 as an input signal of the U1B comparator circuit IN-; IN fig. 2, R14, C9, R15 and C10 form a two-stage RC filter B circuit, which filters a constant current regulation PWM signal set by a single chip microcomputer to output a dc level signal as an input signal of a U1B comparator IN +; in fig. 2, R13 and C11 form a system setting current calibration signal acquisition circuit, Iref _ calibration is a system setting current calibration acquisition signal, and the single chip microcomputer acquires a calibration signal voltage through the ADC to finely adjust Iref _ PWM, thereby achieving the purpose of accurately setting a reference signal in a closed loop. In fig. 2, D4, R19 and R20 constitute a voltage clamping circuit of a voltage setting signal, so that an uncertain level is protected in an MCU runaway state, and values of R19 and R20 are changed according to design requirements to change a clamping voltage value. In fig. 2, R12 and C8 constitute a circuit B for acquiring a dc power supply output current signal, and the single chip microcomputer converts the current signal acquired by the ADC into an output current value as a reference of a constant current regulation current. When the input signal level of the U1B comparator circuit IN-is higher than the input signal level of IN +, D3 is conducted, the optical coupler works and is conducted, and the Duty _ Ref signal is pulled low; otherwise, D3 is cut off, the optical coupler is turned off, the Duty _ Ref signal is disconnected and suspended, and the PWM converter circuit regulates the power output of the transformer according to the feedback signal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (2)

1. A charger power feedback regulation and control circuit is characterized by comprising an EMI filter circuit, a bridge rectifier filter circuit, a half-bridge converter circuit, a power feedback regulation and control circuit, a transformer circuit, an output filter circuit, an MCU control circuit, a direct current power supply output circuit and the like;
the 220V alternating current voltage is output as about 310V direct current voltage through the EMI filter circuit and the bridge rectifier filter circuit, then the input pulse voltage of the transformer circuit is converted and adjusted through the half-bridge conversion circuit, the transformer circuit transforms and outputs voltage according to the input pulse voltage signal and the direction and the number of turns of a transformer coil, and then the relatively smooth direct current voltage output is realized through the output filter circuit; the power feedback regulation and control circuit collects voltage and current output by the direct current power supply as output reference signals; the MCU control circuit outputs PWM signals, Vref _ PWM and Iref _ PWM through an IO port of the singlechip, and the PWM signals realize direct-current voltage signal output through two-stage RC filtering.
2. The charger power feedback regulation and control circuit according to claim 1, wherein the power feedback regulation and control circuit comprises a comparator circuit, an isolation feedback circuit, a constant voltage regulation and control comparator A circuit, a secondary RC filter A circuit, a system setting voltage calibration signal acquisition A circuit, a constant current regulation and control comparator B circuit, a secondary RC filter B circuit, a system setting current calibration signal acquisition B circuit, a voltage clamping circuit of a voltage setting signal, and a direct current supply output current signal acquisition circuit,
the charger power feedback regulation and control circuit according to claim 2, characterized in that the comparator circuit is composed of two operational amplifiers U1A and U1B; the isolation feedback circuit consists of a U2 optocoupler, a D2 and a D3 Schottky diode; the circuit A of the constant voltage regulation and control comparator consists of a constant voltage regulation and control circuit, a U1A operational amplifier, R1, C1 and C2; the two-stage RC filtering A circuit consists of R7, C4, R8 and C5, the system setting voltage calibration signal acquisition A circuit consists of R6 and C3, and the B circuit of the constant current regulation comparator consists of a constant current regulation circuit, a U1B operational amplifier, R9 and C6; the two-stage RC filtering B circuit consists of R14, C9, R15 and C10; the system setting current calibration signal acquisition B circuit consists of R13 and C11; the voltage clamping circuit of the voltage setting signal consists of D4, R19 and R20; the direct current supply output current signal acquisition circuit is composed of R12 and C8.
CN202111080150.4A 2021-09-15 2021-09-15 Charger power feedback regulation and control circuit Pending CN113783262A (en)

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Application Number Priority Date Filing Date Title
CN202111080150.4A CN113783262A (en) 2021-09-15 2021-09-15 Charger power feedback regulation and control circuit

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201450455U (en) * 2009-07-14 2010-05-05 黄挺 Intelligent power adapter with adjustable output voltage
CN201623643U (en) * 2010-01-19 2010-11-03 广东斯泰克电子科技有限公司 Power adapter with self-induction and adjustment for output voltage
US20110026275A1 (en) * 2009-07-29 2011-02-03 Delta Electronics, Inc. Voltage-regulating circuit with input voltage detecting circuit and parallel voltage-regulating circuit system using the same
CN202978737U (en) * 2012-07-27 2013-06-05 深圳市三和电力科技有限公司 Flyback circuit with wide input voltage range
CN213586367U (en) * 2020-12-24 2021-06-29 广州城市职业学院 PWM (pulse-width modulation) control adjustable high-power LED (light-emitting diode) constant-voltage constant-current driving circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201450455U (en) * 2009-07-14 2010-05-05 黄挺 Intelligent power adapter with adjustable output voltage
US20110026275A1 (en) * 2009-07-29 2011-02-03 Delta Electronics, Inc. Voltage-regulating circuit with input voltage detecting circuit and parallel voltage-regulating circuit system using the same
CN201623643U (en) * 2010-01-19 2010-11-03 广东斯泰克电子科技有限公司 Power adapter with self-induction and adjustment for output voltage
CN202978737U (en) * 2012-07-27 2013-06-05 深圳市三和电力科技有限公司 Flyback circuit with wide input voltage range
CN213586367U (en) * 2020-12-24 2021-06-29 广州城市职业学院 PWM (pulse-width modulation) control adjustable high-power LED (light-emitting diode) constant-voltage constant-current driving circuit

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