CN112803562A - Wide-range voltage-adjustable current-adjustable power supply charging device - Google Patents
Wide-range voltage-adjustable current-adjustable power supply charging device Download PDFInfo
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- CN112803562A CN112803562A CN202110129713.8A CN202110129713A CN112803562A CN 112803562 A CN112803562 A CN 112803562A CN 202110129713 A CN202110129713 A CN 202110129713A CN 112803562 A CN112803562 A CN 112803562A
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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
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- 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
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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
- 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
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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
- 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
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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
- 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
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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
- 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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Abstract
The invention relates to a wide-range voltage-adjustable current-adjustable power supply charging device which comprises a rectification filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage and current sampling circuit, a feedback amplification 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 supply end of the switch control circuit; and the PWM input end of the feedback amplifying circuit is connected with the main control MCU chip. The invention can be configured with different voltage or current outputs to accommodate batteries of various types.
Description
Technical Field
The invention relates to the technical field of electric vehicle power supplies, in particular to a wide-range voltage-adjustable current-adjustable power supply charging device.
Background
At present, in the electric vehicle charger industry, batteries with different types or capacities need to use special adapters. The electric vehicle chargers on the market are all switching power supplies, but the application of the switching power supplies with adjustable output wide range is not many.
Disclosure of Invention
In view of the above, the present invention provides a power charging device with a wide range of adjustable voltage and current, which can configure different voltage or current outputs to accommodate various types of batteries.
In order to achieve the purpose, the invention adopts the following technical scheme: a wide-range voltage-adjustable current-adjustable 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 amplification 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 supply 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 both connected with commercial power.
The rectification filter circuit comprises: 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 rectifier filter circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifier filter circuit, so that the input and output voltage conversion is realized, and the required direct-current voltage signal is obtained.
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 stabilization signal.
The voltage 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 a PWM analog signal to the PWM input end of the feedback amplifying circuit.
The feedback amplifying circuit: and the PWM analog signal processing 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 switch control circuit.
The switch control circuit: and the PWM control circuit is used for receiving the error signal input by the feedback amplifying circuit, outputting a PWM control signal to the DC-DC conversion circuit and controlling the DC-DC conversion circuit to carry out energy proportional conversion.
The independent power supply circuit: for independently powering the switch control circuits.
Further, the switch control circuit adopts an AP3844 current mode 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; a first end of the resistor R2 is connected to a commercial power and a first end of the capacitor C2, a second end of the resistor R2 is connected to a second end of the capacitor C2 and a first end of the resistor R5, a second end of the resistor R5 is connected to a negative electrode of the zener diode D5 and a positive electrode of the rectifier diode D4, a positive electrode of the zener diode D5 is connected to a power ground PGND, a negative electrode of the rectifier diode D4 is connected to a first end of the capacitor C24 and a first end of the resistor R37, a second end of the capacitor C24 is connected to the power ground PGND, a second end of the resistor R37 is connected to a first end of the capacitor C12, a first end of the capacitor C16 and a power supply terminal of the AP3844 current type PWM controller, and a second end of the capacitor C12 and a second end of the capacitor C16 are both connected to the power ground PGND.
Furthermore, 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.
Furthermore, the master control MCU chip adopts an STC8 singlechip.
Advantageous effects
Compared with the prior art, the AP3844 current type PWM controller of the switch control circuit is powered by the independent power supply circuit, the independent power supply circuit ensures that the voltage output by the filter circuit is changed 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 PWM analog signal is compared with a voltage sampling signal and a current sampling signal which are 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, a switch tube Q3 of the DC-DC conversion circuit is switched through a switch to adjust the energy output proportion of the transformer T1, and finally, a 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. One part of the direct current voltage-stabilizing signal is used as a load power supply to supply power to 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 dynamically balanced 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 be suitable for batteries of various types.
Drawings
Fig. 1 is a schematic structural diagram of a wide-range voltage-adjustable current-adjustable power charging device.
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 circuit diagram of the independent power supply of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments:
as shown in fig. 1, a wide-range voltage-adjustable current-adjustable power charging device includes a rectifying filter circuit, a DC-DC conversion circuit, a filter circuit, a voltage-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 supply 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 both connected with the mains supply.
The rectification filter circuit: 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.
DC-DC conversion circuit: and the rectifier filter circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifier filter circuit, so that the input and output voltage conversion is realized, and the required direct-current voltage signal is obtained.
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 stabilization signal.
Voltage 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 the PWM analog signal to the PWM input end of the feedback amplifying circuit.
A feedback amplification circuit: and the PWM analog signal processing 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 switch control circuit.
The switch control circuit: and the PWM control circuit is used for receiving the error signal input by the feedback amplifying circuit, outputting a PWM control signal to the DC-DC conversion circuit and controlling the DC-DC conversion circuit to carry out energy proportional conversion.
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 an SIM communication module. When the main control MCU chip receives the communication instruction requirement of the mobile phone end, the corresponding PWM analog signal is output to the feedback amplifying circuit, the 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, the PWM control signal is output to the DC-DC conversion circuit, and the DC voltage and the current output by the DC-DC conversion circuit are controlled.
In the technical solution of the present invention, the switch control circuit adopts an AP3844 current type PWM controller (shown in fig. 2, device U2). The independent power supply circuit supplies power for 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; a first end of the resistor R2 is connected to the commercial power and a first end of the capacitor C2, a second end of the resistor R2 is connected to a second end of the capacitor C2 and a first end of the resistor R5, a second end of the resistor R5 is connected to a cathode of the zener diode D5 and an anode of the rectifier diode D4, an anode of the zener diode D5 is connected to the power ground PGND, a cathode of the rectifier diode D4 is connected to a first end of the capacitor C24 and a first end of the resistor R37, a second end of the capacitor C24 is connected to the power ground PGND, a second end of the resistor R37 is connected to a first end of the capacitor C12, a first end of the capacitor C16, and a power supply terminal of the AP3844 current-type PWM controller (shown in fig. 2, a pin 7 of the U2), and a second end of the capacitor C12 and a second end of the capacitor C16 are both connected.
The rectifying and filtering circuit comprises a bridge rectifier D1 and a capacitor C3, and rectifies and filters the commercial power respectively.
In operation, as shown in fig. 4, the commercial power flows in from the live ACL and the neutral ACN, and in the positive half cycle (assuming that the flow in from the ACL is positive and the flow in from the ACN is negative), the fuse F1, the capacitor C2, the resistor R5, the rectifier diode D4, the capacitor C24, the power 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 supply end of the AP3844 current type PWM controller is obtained by voltage division by a capacitor C2 and a resistor R5, clamping by a voltage stabilizing diode D5, rectification by a rectifying diode D4, filtering by a capacitor C24, and then filtering by a resistor R37, a capacitor C12 and a capacitor C16, so that an independent power supply with better filtering effect is obtained.
As shown in the circuit diagram of the power supply portion shown in fig. 2, in the technical solution of the present invention, the DC-DC conversion circuit includes a transformer T1, a capacitor C9, a resistor R6, a diode D6, a switching 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 of the switch tube Q3, the gate of the switch tube is connected with the first end of the resistor R17, the second end of the resistor R17 is connected with the source of the switch tube, the source of the switch tube is connected with the first end of the resistor R23, and the second end of the resistor R23 is connected with the power ground PGND. The output end of the AP3844 current mode PWM controller is connected to the gate of the switching tube Q3 through a driving resistor R15. The 9 th end of the transformer T1 outputs DC voltage to the filter circuit, the 7 th end is connected with the cathode of the ultrafast diode D8, and the anode of the ultrafast diode D8 is connected with the signal ground GND. The gate of the switching tube Q3 is the control end of the DC-DC conversion circuit, the 9 th end of the transformer T1 is the output end of the DC-DC conversion circuit, and the 5 th end of the transformer T1 is the input end of the DC-DC conversion circuit.
In the technical scheme of the invention, the filter circuit comprises a C10, and the 9 th end of the transformer T1 outputs direct-current voltage which is filtered by a C10 to output a direct-current voltage-stabilizing signal.
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 stabilized voltage signal output by the filter circuit is connected with a first end of a resistor R16, a second end of a resistor R16 is respectively connected with a first end of a resistor R21 and a first end of a resistor R22, and a second end of the resistor R21 and a second end of a resistor R22 are respectively connected with a signal ground GND. The voltage sampling 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 input comprises a voltage sampling input and a current sampling input, and the PWM input comprises 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 to a negative input end of the operational amplifier U3A, a positive input end of the operational amplifier U3A is connected with a first end of a capacitor C18, a positive input end of the operational amplifier U3A is input with a voltage reference signal, a second end of the capacitor C18 is connected with a signal ground GND, a negative input end of the operational amplifier U3A is connected with a first end of the resistor R14, a second end of the resistor R14 is connected with a first end of the capacitor C11, a second end of the capacitor C11 is connected with an output end of the operational amplifier U3A, and an 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 input is connected with a first end of a resistor R36, a second end of the resistor R36 is connected with a negative input end of an operational amplifier U3B, a positive input end of the operational amplifier U3B is connected with a first end of a capacitor C23, a current reference signal is input into a positive input end of an operational amplifier U3A, a second end of a capacitor C23 is connected with a signal ground GND, a negative input end of the operational amplifier U3B is connected with a first end of a resistor R32, a second end of a resistor R32 is connected with a first end of a capacitor C20, a second end of a capacitor C20 is connected with an output end of an operational amplifier U3B, and an output end of the operational amplifier U3.
The 2 nd pin of the operational amplifier U3A and the 6 th pin of the operational amplifier U3B serve as a voltage sampling input and a current sampling input of the feedback amplification circuit, respectively.
The 3 rd pin of the operational amplifier U3A and the 5 th pin of the operational amplifier U3B serve as a voltage PWM input and a current PWM input, respectively, of the feedback amplification circuit.
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 mobile phone, the PWM signal is converted into a PWM analog signal through digital-to-analog conversion and then output to the 3 rd pin of the operational amplifier U3A, and a smooth dc reference voltage VSET is formed through filtering by the C18. VSET is compared with the voltage sampling signal to generate a voltage error signal. The voltage error signal passes through a bias network formed by a diode D10, a resistor R33, pins 1 and 2 of a photoelectric coupler U4, a resistor R24 and a resistor R25, is input from pins 1 and 2 of a photoelectric coupler U4, corresponding currents are generated through pins 1 and 2 of a photoelectric coupler U4, different currents correspond to different optical signals, and the voltage error signal is transmitted to the other side through transmission of the optical signals.
The voltage error signal is output by the optical coupler pins 3 and 4 and is sent to the 1 st pin of the chip AP 3844. The AP3844 adjusts the duty ratio according to the voltage of the 1 st pin, and outputs a PWM control signal through the 6 th pin, and the PWM control signal is sent to the gate of the switching tube Q3 through the driving resistor R15, so that the switching tube Q3 is adjusted. Under the regulation of the switching tube Q3, the primary main winding energy of the transformer T1 changes correspondingly, and the winding energy coupled to the secondary winding changes correspondingly synchronously. An induced voltage is formed at pins 9 and 7 of the transformer T1, and the induced voltage is rectified by the D8 and filtered by the C10 to obtain a direct-current output voltage VOUT. When the MCU changes the PWM analog signal according to a communication instruction of the mobile phone of a user, 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 (1+ R16/R21| | R22) × VSET.
Similarly, the main control MCU chip outputs a corresponding PWM signal according to the communication instruction requirement of the user mobile phone end, the PWM signal is converted into a PWM analog signal through digital-to-analog conversion and is output, the PWM analog 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 diode D12, a resistor R33, pins 1 and 2 of a photoelectric coupler U4, a bias network consisting of a resistor R24 and a resistor R25, the current error signal is input through the pins 1 and 2 of the photoelectric coupler U4, corresponding currents are generated through the 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 by the opto- coupler pins 3 and 4 and is sent to the 1 st pin of the chip AP 3844. The AP3844 adjusts the duty ratio according to the voltage of the 1 st pin, and outputs a PWM control signal through the 6 th pin, and the PWM control signal is sent to the gate of the switching tube Q3 through the driving resistor R15, so that the switching tube Q3 is adjusted.
Under the regulation of the switching tube Q3, the primary main winding energy of the transformer T1 changes correspondingly, and the winding energy coupled to the secondary winding changes correspondingly synchronously. An induced voltage is formed at pins 9 and 7 of the transformer T1, and the induced voltage is rectified by the D8 and filtered by the C10 to obtain a direct-current output voltage VOUT.
The output current IOUT is ISET/R12, and when the MCU changes the PWM analog signal according to the communication command of the user's mobile phone, the dc reference voltage ISET changes, so as to change the output current IOUT and achieve the purpose of adjusting the current.
When voltage adjustment is performed, the diode D12 is in a cut-off state; when current regulation is performed, the diode D10 is in the off state. The voltage regulation and the current regulation are not synchronized. The invention can configure different voltage or current outputs according to the communication instruction of the mobile phone terminal so as to be suitable for batteries of various types.
In the technical scheme of the invention, the independent power supply circuit ensures that the voltage output by the filter circuit is changed within a wide range, and the switch control circuit can still work normally. The switch tube Q3 of the DC-DC conversion circuit is switched by a switch to adjust the energy output proportion of the transformer T1, and finally, the direct-current voltage stabilization signal is filtered and output by the filter circuit. One part of the direct current voltage-stabilizing signal is used as a load power supply to supply power to 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 dynamically balanced closed-loop automatic control system.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A wide-range voltage-adjustable current-adjustable 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 amplification 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 supply 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 both connected with commercial power.
The rectification filter circuit comprises: 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 rectifier filter circuit is used for adjusting the energy output proportion of the direct-current voltage signal input by the rectifier filter circuit, so that the input and output voltage conversion is realized, and the required direct-current voltage signal is obtained.
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 stabilization signal.
The voltage 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 a PWM analog signal to the PWM input end of the feedback amplifying circuit.
The feedback amplifying circuit: and the PWM analog signal processing 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 switch control circuit.
The switch control circuit: and the PWM control circuit is used for receiving the error signal input by the feedback amplifying circuit, outputting a PWM control signal to the DC-DC conversion circuit and controlling the DC-DC conversion circuit to carry out energy proportional conversion.
The independent power supply circuit: for independently powering the switch control circuits.
2. The wide-range voltage-regulated and current-regulated power charging device according to claim 1, wherein said switch control circuit is an AP3844 current-mode PWM controller.
3. The wide-range voltage-adjustable current-adjustable power charging device according to claim 2, wherein 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; a first end of the resistor R2 is connected to a commercial power and a first end of the capacitor C2, a second end of the resistor R2 is connected to a second end of the capacitor C2 and a first end of the resistor R5, a second end of the resistor R5 is connected to a negative electrode of the zener diode D5 and a positive electrode of the rectifier diode D4, a positive electrode of the zener diode D5 is connected to a power ground PGND, a negative electrode of the rectifier diode D4 is connected to a first end of the capacitor C24 and a first end of the resistor R37, a second end of the capacitor C24 is connected to the power ground PGND, a second end of the resistor R37 is connected to a first end of the capacitor C12, a first end of the capacitor C16 and a power supply terminal of the AP3844 current type PWM controller, and a second end of the capacitor C12 and a second end of the capacitor C16 are both connected to the power ground PGND.
4. The wide-range voltage-adjustable current-adjustable power supply charging device according to claim 1, wherein the main control MCU chip is connected to a communication module, and the communication module is wirelessly connected to the mobile terminal.
5. The device of claim 1, wherein the communication module is one of a bluetooth communication module and a SIM communication module.
6. The wide-range voltage-adjustable current-adjustable power charging device according to claim 1, wherein the main control MCU chip employs an STC8 single chip microcomputer.
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| CN202110129713.8A CN112803562B (en) | 2021-01-29 | 2021-01-29 | Power supply charging device capable of regulating voltage and current in wide range |
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