CN112803562B - Power supply charging device capable of regulating voltage and current in wide range - Google Patents

Power supply charging device capable of regulating voltage and current in wide range Download PDF

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Publication number
CN112803562B
CN112803562B CN202110129713.8A CN202110129713A CN112803562B CN 112803562 B CN112803562 B CN 112803562B CN 202110129713 A CN202110129713 A CN 202110129713A CN 112803562 B CN112803562 B CN 112803562B
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circuit
voltage
current
capacitor
power supply
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CN202110129713.8A
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CN112803562A (en
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高敏
周建惠
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Quanzhou Beiwa Electronic Technology Co ltd
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Quanzhou Beiwa Electronic Technology Co ltd
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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
    • H02J7/02—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
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • B60L53/20—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 characterised by converters located in the vehicle
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T90/14—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 power supply charging device with a wide range of voltage and current regulation, which comprises a rectification filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage and current sampling circuit, a feedback amplifying circuit, a switch control circuit, a main control MCU chip and an independent power supply circuit, wherein the rectification filter circuit is connected with the DC-DC conversion circuit; the output end of the rectification filter circuit is connected with the input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end of the voltage and current sampling circuit, the output end of the voltage and current sampling circuit is connected with the sampling input end of the feedback amplifying circuit, the output end of the feedback amplifying circuit is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the DC-DC conversion circuit; the output end of the independent power supply circuit is connected with the power end of the switch control circuit; the PWM input end of the feedback amplifying circuit is connected with the main control MCU chip. The invention can configure different voltage or current outputs so as to adapt to batteries of various types.

Description

Power supply charging device capable of regulating voltage and current in wide range
Technical Field
The invention relates to the technical field of electric vehicle power supplies, in particular to a power supply charging device with wide-range voltage and current regulation.
Background
Currently, in the electric vehicle charger industry, batteries of different types or capacities all require special adapters. Electric vehicle chargers on the market are all a switching power supply, however, the switching power supply has not many applications with adjustable output in a wide range.
Disclosure of Invention
In view of the above, the present invention is directed to a power charging device with wide-range voltage and current regulation, which can configure different voltage or current outputs so as to adapt to various types of batteries.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the power supply charging device is characterized by comprising a rectification filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage and current sampling circuit, a feedback amplifying circuit, a switch control circuit, a main control MCU chip and an independent power supply circuit; the output end of the rectification filter circuit is connected with the input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the filter circuit; the output end of the filtering circuit is connected with the input end of the voltage and current sampling circuit, the output end of the voltage and current sampling circuit is connected with the sampling input end of the feedback amplifying circuit, the output end of the feedback amplifying circuit is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the DC-DC conversion circuit; the output end of the independent power supply circuit is connected with the power end of the switch control circuit; the PWM input end of the feedback amplifying circuit is connected with the main control MCU chip; and the input ends of the rectification filter circuit and the independent power supply circuit are connected with the mains supply.
The rectification filter circuit comprises: and the DC-DC conversion circuit is used for rectifying and filtering the input alternating-current voltage signal and outputting a direct-current voltage signal to the DC-DC conversion circuit.
The DC-DC conversion circuit: and the rectifying and filtering circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifying and filtering circuit, so as to realize the conversion of the input voltage and the output voltage and obtain the required direct-current voltage signal.
The filter circuit: and the DC-DC conversion circuit is used for filtering the signal input by the DC-DC conversion circuit to obtain a direct current voltage stabilizing signal.
The voltage and current sampling circuit comprises: and the sampling circuit is used for sampling the direct-current voltage-stabilizing signal output by the filter circuit to obtain a voltage sampling signal and a current sampling signal.
And the main control MCU chip is used for outputting PWM analog signals to the PWM input end of the feedback amplifying circuit.
The feedback amplification circuit: and the switching control circuit is used for comparing the sampling signal input by the voltage and current sampling circuit with the PWM analog signal input by the main control MCU chip and outputting an error signal to the switching control circuit.
The switch control circuit: the feedback amplifying circuit is used for receiving an error signal input by the feedback amplifying circuit and outputting a PWM control signal to the DC-DC conversion circuit to control the DC-DC conversion circuit to perform energy proportional conversion.
The independent power supply circuit: for independently powering the switch control circuits.
Further, the switch control circuit adopts an AP3844 current type PWM controller.
Further, the independent power supply circuit comprises a resistor R2, a capacitor C2, a resistor R5, a zener diode D5, a rectifier diode D4, a capacitor C24, a resistor R37, a capacitor C12 and a capacitor C16; the first end of resistance R2 is connected the commercial power respectively with the first end of electric capacity C2, the second end of resistance R2 is connected respectively the second end of electric capacity C2 with the first end of resistance R5, the second end of resistance R5 is connected respectively zener diode D5's negative pole with rectifier diode D4's positive pole, zener diode D5's positive pole is connected power ground PGND, rectifier diode D4's negative pole is connected respectively the first end of electric capacity C24 with the first end of resistance R37, the second end of electric capacity C24 is connected power ground PGND, the second end of resistance R37 is connected respectively the first end of electric capacity C12, the first end of electric capacity C16 and the power end of AP3844 current mode PWM controller, the second end of electric capacity C12 and the second end of electric capacity C16 all are connected with power ground PGND.
Further, the main control MCU chip is connected with a communication module, and the communication module is in wireless connection with the mobile terminal.
Further, the communication module is one of a Bluetooth communication module and a SIM communication module.
Further, the master control MCU chip adopts an STC8 singlechip.
Advantageous effects
Compared with the prior art, the invention adopts the independent power supply circuit to supply power to the AP3844 current type PWM controller of the switch control circuit, and the independent power supply circuit ensures that the voltage output by the filter circuit of the invention changes within a wide range, and the switch control circuit can still work normally. The main control MCU chip is connected with a communication module, and the communication module is in wireless connection with the mobile terminal. When the main control MCU chip receives the communication instruction requirement of the mobile phone end, a corresponding PWM analog signal is output to the feedback amplifying circuit, the corresponding PWM analog signal is compared with the voltage sampling signal and the current sampling signal input by the voltage and current sampling circuit, an error signal is output to the switch control circuit, the switch control circuit receives the error signal and outputs the PWM control signal to the control end of the DC-DC conversion circuit, the switching tube Q3 of the DC-DC conversion circuit is switched through a switch, the energy output proportion of the transformer T1 is adjusted, and finally the direct current voltage signal output by the DC-DC conversion circuit is filtered by the filter circuit to output a direct current voltage stabilizing signal. A part of the direct current voltage stabilizing signal is used as a load power supply to supply power for the electric vehicle, and the other part of the direct current voltage stabilizing signal is used as a sampling signal, so that the whole system forms a dynamic balance closed loop automatic control system. The invention can configure different voltage or current outputs according to the communication instruction of the mobile phone terminal so as to adapt to batteries of various models.
Drawings
Fig. 1 is a schematic structural diagram of a power charging device with wide-range voltage and current regulation.
Fig. 2 is a circuit diagram of a power supply portion of the present invention.
Fig. 3 is a circuit diagram of a control portion of the present invention.
Fig. 4 is a diagram of an independent power supply circuit of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples, in which:
As shown in FIG. 1, the power supply charging device with wide-range voltage and current regulation comprises a rectification filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage and current sampling circuit, a feedback amplifying circuit, a switch control circuit, a main control MCU chip and an independent power supply circuit; the output end of the rectification filter circuit is connected with the input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the filter circuit; the output end of the filter circuit is connected with the input end of the voltage and current sampling circuit, the output end of the voltage and current sampling circuit is connected with the sampling input end of the feedback amplifying circuit, the output end of the feedback amplifying circuit is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the DC-DC conversion circuit; the output end of the independent power supply circuit is connected with the power end of the switch control circuit; the PWM input end of the feedback amplifying circuit is connected with the main control MCU chip; the input ends of the rectification filter circuit and the independent power supply circuit are connected with the mains supply.
And the rectification filter circuit is: and the DC-DC conversion circuit is used for rectifying and filtering the input alternating-current voltage signal and outputting a direct-current voltage signal to the DC-DC conversion circuit.
A DC-DC conversion circuit: and the rectifying and filtering circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifying and filtering circuit, so as to realize the conversion of the input voltage and the output voltage and obtain the required direct-current voltage signal.
And a filter circuit: and the DC-DC conversion circuit is used for filtering the signal input by the DC-DC conversion circuit to obtain a direct current voltage stabilizing signal.
Voltage and current sampling circuit: and the sampling circuit is used for sampling the direct-current voltage-stabilizing signal output by the filter circuit to obtain a voltage sampling signal and a current sampling signal.
And the main control MCU chip is used for outputting PWM analog signals to the PWM input end of the feedback amplifying circuit.
Feedback amplification circuit: and the switching control circuit is used for comparing the sampling signal input by the voltage and current sampling circuit with the PWM analog signal input by the main control MCU chip and outputting an error signal to the switching control circuit.
And a switch control circuit: the feedback amplifying circuit is used for receiving an error signal input by the feedback amplifying circuit and outputting a PWM control signal to the DC-DC conversion circuit to control the DC-DC conversion circuit to perform energy proportional conversion.
And an independent power supply circuit: for independently powering the switch control circuits.
The main control MCU chip is connected with a communication module, and the communication module is in wireless connection with the mobile terminal. The communication module is one of a Bluetooth communication module and a SIM communication module. When the main control MCU chip receives the communication instruction requirement of the mobile phone end, a corresponding PWM analog signal is output to the feedback amplifying circuit, the corresponding PWM analog signal is compared with the voltage sampling signal and the current sampling signal input by the voltage and current sampling circuit, an error signal is output to the switch control circuit, the switch control circuit receives the error signal, a PWM control signal is output to the DC-DC conversion circuit, and the direct current voltage and the current output by the DC-DC conversion circuit are controlled.
In the technical scheme of the invention, the switch control circuit adopts an AP3844 current type PWM controller (shown in FIG. 2, device U2). The independent power supply circuit provides power to the AP3844 current mode PWM controller.
As shown in fig. 4, the independent power supply circuit includes a resistor R2, a capacitor C2, a resistor R5, a zener diode D5, a rectifier diode D4, a capacitor C24, a resistor R37, a capacitor C12, and a capacitor C16; the first end of resistance R2 is connected commercial power and the first end of electric capacity C2 respectively, the second end of resistance R2 is connected the second end of electric capacity C2 and the first end of resistance R5 respectively, the negative pole of resistance R5 is connected the positive pole of zener diode D5 and rectifier diode D4 respectively, the positive pole of zener diode D5 is connected power ground PGND, the first end of electric capacity C24 and the first end of resistance R37 are connected respectively to rectifier diode D4's negative pole, the power ground PGND is connected to the second end of electric capacity C24, the first end of electric capacity C12 is connected respectively to the second end of resistance R37, the first end of electric capacity C16 and the power end of AP3844 current mode PWM controller (shown in FIG. 2, the 7 th foot of U2), the second end of electric capacity C12 and the second end of electric capacity C16 are all connected with power ground PGND.
The rectifying and filtering circuit comprises a bridge rectifier D1 and a capacitor C3, and is used for rectifying and filtering the mains supply respectively.
In operation, as shown in fig. 4, the utility power flows in from the live line ACL and the neutral line ACN, and in the positive half cycle (assuming that the flow in from ACL is positive and the flow in ACN is negative), the fuse F1, the capacitor C2, the resistor R5, the rectifier diode D4, the capacitor C24, the power supply ground PGND, the bridge rectifier D1, and the thermistor NTC1 form a loop to charge the capacitor C2 and the capacitor C24; during the negative half cycle of the alternating current, the capacitor C2 is mainly released through the bridge rectifier D1, the capacitor C3, the power ground PGND and the zener diode D5. The power VCC of the power end of the AP3844 current type PWM controller is divided by a capacitor C2 and a resistor R5, clamped by a voltage stabilizing diode D5, rectified by a rectifying diode D4, obtained after filtering by a capacitor C24, and then an independent power supply with better filtering effect is obtained through a resistor R37, a capacitor C12 and a capacitor C16.
In the technical scheme of the invention, as shown in the power supply part circuit diagram of fig. 2, the DC-DC conversion circuit comprises a transformer T1, a capacitor C9, a resistor R6, a diode D6, a switch tube Q3, a resistor R17, a resistor R23 and an ultrafast diode D8; the 5 th end of the transformer T1 is connected with the voltage VIN input by the rectifying and filtering circuit, and is also connected with the first end of the resistor R6 and the first end of the capacitor C9; the second end of the resistor R6 and the second end of the capacitor C9 are respectively connected with the cathode of the diode D6, the anode of the diode D6, the 6 th end of the transformer T1 and the drain electrode of the switching tube Q3, the grid electrode of the switching tube is connected with the first end of the resistor R17, the second end of the resistor R17 is connected with the source electrode of the switching tube, the source electrode of the switching tube is connected with the first end of the resistor R23, and the second end of the resistor R23 is connected to the power ground PGND. The output end of the AP3844 current type PWM controller is connected with the grid electrode of the switching tube Q3 through the driving resistor R15. The 9 th end of the transformer T1 outputs direct current voltage to the filter circuit, the 7 th end is connected with the cathode of the ultra-fast diode D8, and the anode of the ultra-fast diode D8 is connected with the signal ground GND. The grid electrode of the switch tube Q3 is a control end of the DC-DC conversion circuit, the 9 th end of the transformer T1 is an output end of the DC-DC conversion circuit, and the 5 th end of the transformer T1 is an input end of the DC-DC conversion circuit.
In the technical scheme of the invention, the filter circuit comprises C10, and the 9 th end of the transformer T1 outputs direct current voltage and outputs a direct current voltage stabilizing signal through C10 filtering.
In the technical scheme of the invention, the voltage sampling circuit comprises a resistor R16, a resistor R21 and a resistor R22. The direct current voltage stabilizing signal output by the filter circuit is connected with the first end of a resistor R16, the second end of the resistor R16 is respectively connected with the first end of a resistor R21 and the first end of a resistor R22, and the second end of the resistor R21 and the second end of the resistor R22 are respectively connected with a signal ground GND. The voltage sample signal is output from the second terminal of the resistor R16.
In the technical scheme of the invention, the current sampling circuit comprises a resistor R12. The first end of the resistor R12 is connected to the signal ground GND, and the second end of the resistor R12 outputs a current sampling signal to the feedback amplifying circuit.
In the technical scheme of the invention, the feedback amplifying circuit comprises a voltage feedback amplifying circuit and a current feedback amplifying circuit. The sampling inputs include a voltage sampling input and a current sampling input, and the PWM inputs include a voltage PWM input and a current PWM input.
The voltage feedback amplifying circuit comprises an operational amplifier U3A, a capacitor C18, a resistor R14 and a capacitor C11, wherein a voltage sampling signal is input into the negative input end of the operational amplifier U3A, the positive input end of the operational amplifier U3A is connected with the first end of the capacitor C18, the positive input end of the operational amplifier U3A is input with a voltage reference signal, the second end of the capacitor C18 is connected with a signal ground GND, the negative input end of the operational amplifier U3A is connected with the first end of the resistor R14, the second end of the resistor R14 is connected with the first end of the capacitor C11, the second end of the capacitor C11 is connected with the output end of the operational amplifier U3A, and the output end of the operational amplifier U3A outputs a voltage error signal.
The current feedback amplifying circuit comprises an operational amplifier U3B, a capacitor C23, a resistor R32, a resistor R36 and a capacitor C20, wherein a current sampling signal is input to be connected with the first end of the resistor R36, the second end of the resistor R36 is connected with the negative input end of the operational amplifier U3B, the positive input end of the operational amplifier U3B is connected with the first end of the capacitor C23, the positive input end of the operational amplifier U3A is input with a current reference signal, the second end of the capacitor C23 is connected with a signal ground GND, the negative input end of the operational amplifier U3B is connected with the first end of the resistor R32, the second end of the resistor R32 is connected with the first end of the capacitor C20, the second end of the capacitor C20 is connected with the output end of the operational amplifier U3B, and the output end of the operational amplifier U3B outputs a current error signal.
The 2 nd pin of the operational amplifier U3A and the 6 th pin of the operational amplifier U3B are respectively used as a voltage sampling input end and a current sampling input end of the feedback amplifying circuit.
The 3 rd pin of the operational amplifier U3A and the 5 th pin of the operational amplifier U3B are used as a voltage PWM input terminal and a current PWM input terminal of the feedback amplifying circuit, respectively.
As shown in fig. 2-3, the main control MCU chip outputs a corresponding PWM signal according to the communication command requirement of the user's mobile phone end, the PWM signal is converted into a PWM analog signal through digital-to-analog conversion, and the PWM signal is sent to the 3 rd pin of the op-amp U3A, and the smooth dc reference voltage VSET is formed by filtering with C18. VSET is compared to the voltage sample signal to generate a voltage error signal. The voltage error signal passes through a bias network composed of a diode D10, a resistor R33, pins 1 and 2 of the photoelectric coupler U4, a resistor R24 and a resistor R25, and is input by pins 1 and 2 of the photoelectric coupler U4, corresponding currents are generated through pins 1 and 2 of the photoelectric coupler U4, different currents correspond to different optical signals, and the voltage error signal is transmitted to the other side through the transmission of the optical signals.
The voltage error signal is output from optocouplers 3 and 4 and sent to pin 1 of chip AP 3844. The AP3844 adjusts the duty ratio according to the voltage of the 1 st pin, and outputs a PWM control signal from the 6 th pin, where the PWM control signal is sent to the gate of the switching tube Q3 through the driving resistor R15, thereby adjusting the switching tube Q3. With the adjustment of the switching tube Q3, the primary winding energy of the transformer T1 changes accordingly, and the winding energy coupled to the secondary changes accordingly in synchronization. Induced voltage is formed on the 9 th pin and the 7 th pin of the transformer T1, and the direct-current output voltage VOUT is obtained through D8 rectification and C10 filtering. When the MCU changes the PWM analog signal according to the communication instruction of the user mobile phone, the direct-current reference voltage VSET changes, so that the direct-current output voltage VOUT is changed, and the purpose of regulating the voltage is achieved. The equation of the output voltage VOUT and the control voltage VSET is vout= (1+r16/r21||r22) VSET.
Similarly, the main control MCU chip outputs a corresponding PWM signal according to the communication instruction requirement of the mobile phone end of the user, the PWM signal is converted into a PWM analog signal through digital-to-analog conversion and is output, and the PWM signal is sent to the 5 th pin of the operational amplifier U3B, and the smooth direct current reference voltage ISET is formed through C23 filtering.
ISET is compared with a current sampling signal to generate a current error signal, the current error signal passes through a bias network formed by a diode D12, a resistor R33, pins 1 and 2 of a photoelectric coupler U4, a resistor R24 and a resistor R25, and is input by pins 1 and 2 of the photoelectric coupler U4, corresponding currents are generated through pins 1 and 2 of the photoelectric coupler U4, different currents correspond to different optical signals, and the current error signal is transmitted to the other side through transmission of the optical signals.
The current error signal is output from optocouplers 3 and 4 and sent to pin 1 of chip AP 3844. The AP3844 adjusts the duty ratio according to the voltage of the 1 st pin, and outputs a PWM control signal from the 6 th pin, where the PWM control signal is sent to the gate of the switching tube Q3 through the driving resistor R15, thereby adjusting the switching tube Q3.
With the adjustment of the switching tube Q3, the primary winding energy of the transformer T1 changes accordingly, and the winding energy coupled to the secondary changes accordingly in synchronization. Induced voltage is formed on the 9 th pin and the 7 th pin of the transformer T1, and the direct-current output voltage VOUT is obtained through D8 rectification and C10 filtering.
When the MCU changes the PWM analog signal according to the communication instruction of the user mobile phone, the direct current reference voltage ISET changes, so that the output current IOUT is changed, and the purpose of adjusting the current is achieved.
When voltage regulation is performed, the diode D12 is in an off state; when current regulation is performed, the diode D10 is in an off state. The voltage regulation and the current regulation are not performed synchronously. The invention can configure different voltage or current outputs according to the communication instruction of the mobile phone terminal so as to adapt to batteries of various models.
In the technical scheme of the invention, the independent power supply circuit ensures that the voltage output by the filter circuit changes within a wide range, and the switch control circuit can still work normally. The switching tube Q3 of the DC-DC conversion circuit is switched by a switch, so that the energy output proportion of the transformer T1 is adjusted, and finally, a direct current voltage-stabilizing signal is filtered by a filter circuit. A part of the direct current voltage stabilizing signal is used as a load power supply to supply power for the electric vehicle, and the other part of the direct current voltage stabilizing signal is used as a sampling signal, so that the whole system forms a dynamic balance closed loop automatic control system.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (2)

1. The power supply charging device is characterized by comprising a rectification filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage and current sampling circuit, a feedback amplifying circuit, a switch control circuit, a main control MCU chip and an independent power supply circuit; the output end of the rectification filter circuit is connected with the input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the filter circuit; the output end of the filtering circuit is connected with the input end of the voltage and current sampling circuit, the output end of the voltage and current sampling circuit is connected with the sampling input end of the feedback amplifying circuit, the output end of the feedback amplifying circuit is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the DC-DC conversion circuit; the output end of the independent power supply circuit is connected with the power end of the switch control circuit; the PWM input end of the feedback amplifying circuit is connected with the main control MCU chip; the input ends of the rectification filter circuit and the independent power supply circuit are connected with the mains supply;
the rectification filter circuit comprises: the DC-DC conversion circuit is used for rectifying and filtering an input alternating-current voltage signal to output a direct-current voltage signal to the DC-DC conversion circuit;
The DC-DC conversion circuit: the rectifying and filtering circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifying and filtering circuit, so as to realize the conversion of the input voltage and the output voltage and obtain a required direct-current voltage signal;
The filter circuit: the DC-DC conversion circuit is used for filtering signals input by the DC-DC conversion circuit to obtain direct current voltage-stabilizing signals;
the voltage and current sampling circuit comprises: the direct current voltage stabilizing circuit is used for sampling the direct current voltage stabilizing signal output by the filter circuit to obtain a voltage sampling signal and a current sampling signal;
The main control MCU chip is used for outputting PWM analog signals to the PWM input end of the feedback amplifying circuit;
the feedback amplification circuit: the switching control circuit is used for comparing the sampling signal input by the voltage and current sampling circuit with the PWM analog signal input by the main control MCU chip and outputting an error signal to the switching control circuit;
The switch control circuit: the feedback amplifying circuit is used for receiving an error signal input by the feedback amplifying circuit and outputting a PWM control signal to the DC-DC conversion circuit to control the DC-DC conversion circuit to perform energy proportional conversion; the switch control circuit adopts an AP3844 current type PWM controller;
the independent power supply circuit: for independently powering the switch control circuit; the independent power supply circuit comprises a resistor R2, a capacitor C2, a resistor R5, a zener diode D5, a rectifier diode D4, a capacitor C24, a resistor R37, a capacitor C12 and a capacitor C16; the first end of the resistor R2 is respectively connected with the mains supply and the first end of the capacitor C2, the second end of the resistor R2 is respectively connected with the second end of the capacitor C2 and the first end of the resistor R5, the second end of the resistor R5 is respectively connected with the negative electrode of the zener diode D5 and the positive electrode of the rectifying diode D4, the positive electrode of the zener diode D5 is connected with the power supply ground PGND, the negative electrode of the rectifying diode D4 is respectively connected with the first end of the capacitor C24 and the first end of the resistor R37, the second end of the capacitor C24 is connected with the power supply ground PGND, the second end of the resistor R37 is respectively connected with the first end of the capacitor C12, the first end of the capacitor C16 and the power supply end of the AP3844 current type PWM controller, and the second end of the capacitor C12 and the second end of the capacitor C16 are both connected with the power supply ground PGND;
The master control MCU chip adopts an STC8 singlechip; the main control MCU chip is connected with a communication module, and the communication module is in wireless connection with the mobile terminal.
2. The wide range voltage and current adjustable power charging apparatus of claim 1 wherein the communication module is one of a bluetooth communication module and a SIM communication module.
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