CN113036942B - Wireless charging system of super capacitor - Google Patents
Wireless charging system of super capacitor Download PDFInfo
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- CN113036942B CN113036942B CN202110271024.0A CN202110271024A CN113036942B CN 113036942 B CN113036942 B CN 113036942B CN 202110271024 A CN202110271024 A CN 202110271024A CN 113036942 B CN113036942 B CN 113036942B
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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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
Abstract
A wireless charging system of a super capacitor relates to the technical field of wireless power transmission technology and novel energy conversion of unmanned vehicles, robots and the like. The invention aims to solve the problem that the conventional wireless charging mode is difficult to realize high-efficiency charging of a super capacitor. The LCC-S topology circuit provides constant current voltage for the power conversion circuit, and then the power conversion circuit provides constant current for the super capacitor. The charging device is used for efficiently charging the super capacitor.
Description
Technical Field
The invention relates to a wireless power transmission and power conversion device, and relates to the technical field of wireless power transmission technologies and novel energy conversion of unmanned vehicles, robots and the like.
Background
The super capacitor has the advantages of light weight, quick discharge and the like as an energy storage element, can instantly provide large current capability for the drive of a robot or an unmanned vehicle and the like to discharge, and solves the problem that instant large torque drive needs to be provided under working conditions of instant acceleration or climbing and the like. The charging problem of supercapacitors limits their reuse and engineering applications.
The wireless electric energy transmission is a technology for electric energy transmission without electrical connection, and has the advantages of no spark, no contact, convenience, safety and the like when being applied to the fields of robots and electric automobiles to a certain extent. At present, a super capacitor is used as an energy storage device, and because the voltage of a capacitor bank can not be suddenly changed and is in direct proportion to the current, the traditional wireless charging mode is difficult to realize the efficient charging of the super capacitor.
Disclosure of Invention
The invention aims to solve the problem that the conventional wireless charging mode is difficult to realize high-efficiency charging of a super capacitor, and provides a wireless charging system of the super capacitor.
A wireless charging system of a super capacitor comprises an LCC-S topology circuit and a power conversion circuit, wherein the power conversion circuit comprises a BUCK type switch power circuit and a constant current output switch control circuit;
the constant current output switch control circuit comprises a current acquisition circuit, an integral proportion operational amplifier 1, an oscillation circuit 2, a first comparator 3, a voltage acquisition comparison circuit 4, a second comparator 5, an exclusive-OR gate 6 and a totem-pole output circuit 7,
the LCC-S topological circuit is used for providing constant voltage for the constant current output switch control circuit;
the BUCK type switching power supply circuit is used for converting the constant voltage into a constant current signal and inputting the constant current signal to the current acquisition circuit;
the current acquisition circuit is used for acquiring the constant current signal, converting the constant current signal into a voltage signal and sending the voltage signal to the integral proportion operational amplifier 1;
the first comparator 3 is used for comparing the current mean value signal in the period with a triangular wave signal sent by the oscillating circuit 2 and outputting a square wave signal to the exclusive-or gate 6;
the voltage acquisition and comparison circuit 4 is used for acquiring the voltage flowing into the super capacitor C2 and sending the voltage flowing into the super capacitor C2 into the second comparator 5;
the second comparator 5 is used for comparing the voltage flowing into the super capacitor C2 with a reference voltage, and outputting a voltage signal to the exclusive-or gate 6 when the voltage flowing into the super capacitor C2 exceeds the reference voltage;
the exclusive-or gate 6 is used for performing exclusive-or processing on the voltage signal output by the second comparator 5 and the square wave signal and outputting a high level signal;
and the totem-pole output circuit 7 is used for receiving the high-level signal to drive the constant-current output switch control circuit to charge the super capacitor C2.
Preferably, the current collection circuit is implemented by using a resistor R1.
Preferably, the BUCK type switching power supply circuit includes a switching tube Q5, a freewheeling diode D5 and an inductor L1,
the grid of the switch tube Q5 is connected with the output end of the totem-pole type output circuit 7, the drain electrode of the switch tube Q5 is connected with the anode of the LCC-S topological circuit, the source electrode of the switch tube Q5 is simultaneously connected with one end of the inductor L1 and the cathode of the freewheeling diode D5, the anode of the diode D5 is simultaneously connected with the cathode of the LCC-S topological circuit and one end of the resistor R1, the other end of the resistor R1 is simultaneously connected with the cathode of the super capacitor C2 and the current signal input end of the integral proportion operational amplifier 1, and the other end of the inductor L1 is simultaneously connected with the anode of the super capacitor C2 and the voltage signal input end of the voltage acquisition comparison circuit 4.
Preferably, the LCC-S topology circuit comprises a power management module, a high-frequency inverter circuit based on an embedded module, a coupling mechanism and a rectifying and filtering circuit,
the power management module is used for providing direct current for the high-frequency inverter circuit based on the embedded module;
the high-frequency inverter circuit based on the embedded module is used for converting direct current into alternating current and transmitting the alternating current to the coupling mechanism;
the coupling mechanism is used for wirelessly transmitting the alternating current to a rectifying and filtering circuit;
and the rectifying and filtering circuit is used for converting the alternating current into a constant voltage signal.
Preferably, the coupling mechanism comprises a transmitting end resonance circuit and a transmitting side coil L p Receiving side coil L s And a receiving-end resonance circuit,
the transmitting end resonant circuit comprises a compensation inductor L f And a compensation capacitor C f And a capacitor C p ，
The receiving end resonant circuit comprises a resonant capacitor C s ，
Direct current positive electrode connection compensation inductor L of high-frequency inverter circuit based on embedded module f One end of (1), compensation inductance L f The other end of the capacitor is simultaneously connected with a compensation capacitor C f One terminal of and a capacitor C p At the one end of the first tube, and,
DC negative electrode of high-frequency inverter circuit based on embedded module is connected with compensation capacitor C at the same time f Another end of (1) and a transmitting side coil L p One end of (2), a transmitting side coil L p The other end of the capacitor C is connected with a capacitor C p The other end of the first tube is connected with the second tube,
receiving side coil L s One end of which is connected with a resonance capacitor C s One terminal of (1), a resonance capacitor C s The other end of the first and second coils is connected with an input end of the alternating current of the rectifying and filtering circuit and a receiving side coil L s The other end of the rectifier filter circuit is connected with the other input end of the alternating current of the rectifier filter circuit, the anode of the rectifier filter circuit is used as the output anode of the LCC-S topological circuit,
and the cathode of the rectification filter circuit is used as the output cathode of the LCC-S topology circuit.
Preferably, the rectifying-filtering circuit comprises diodes D1-D4 and a capacitor C1,
the diode D1 and the diode D2 are connected in series to serve as a branch circuit, the diode D3 and the diode D4 are connected in series to serve as another branch circuit, and the two branch circuits are connected in parallel and then connected in parallel with the capacitor C1.
Preferably, the high-frequency inverter circuit based on the embedded module is composed of 4 field effect transistors.
Preferably, the coupling mechanism has the relationship:
where ω =2 π f, f is the frequency, L f To compensate for inductance of the inductor, C f To compensate for capacitance, C P Is a capacitance value, L s Inductance value of the receiving side coil, C s Is a resonance capacitance value, L p The inductance value of the transmitting side coil.
Preferably, the receiving side coil L s Resonant capacitor C s The power conversion circuit and the super capacitor C2 are mapped to the transmitting end resonance circuit and the transmitting side coil L p Lateral impedance value Z 1 Expressed as:
wherein M is mutual inductance between the transmitting side coil and the receiving side coil, R L Is the equivalent impedance of the super capacitor.
Preferably, the impedance Z viewed from the right of the high-frequency inverter circuit based on the embedded module in Comprises the following steps:
wherein j is a plurality;
equation 1, equation 3 reduces to:
preferably, the value of the alternating voltage output by the coupling mechanism
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
the constant voltage value is output by the LCC-S topological circuit.
When R is L ＞＞ω 2 M 2 When the temperature of the water is higher than the set temperature,
the voltage gain G of the LCC-S topology circuit is as follows:
the invention has the beneficial effects that:
according to the application, the LCC-S topological circuit is adopted to provide a direct-current power supply, namely constant voltage, for the power conversion circuit, and the coupling mechanism in the LCC-S topological circuit can reduce the loss of the output of the high-frequency inverter circuit based on the embedded module and the loss of a circuit. The LCC-S topology circuit is simple in structure, reduces the number of devices, reduces the conduction loss of the devices, and can provide wireless electric energy for the super capacitor.
The power conversion circuit has the advantages of reducing the charging time, prolonging the service life of the capacitor bank and the charging and discharging times, and can charge the super capacitor efficiently.
According to the wireless charging method, a constant current mode is required to be adopted in a charging stage, so that the voltage of the super capacitor can rise rapidly, the LCC-S topological circuit provides constant current voltage for the power conversion circuit, then the power conversion circuit provides constant current for the super capacitor, the super capacitor is fully charged in the shortest possible time, the safety, reliability and service life of the super capacitor are guaranteed, and the output voltage of the LCC-S topological circuit can charge the super capacitor load only under the control of the power conversion circuit at a receiving end.
The charging method and the charging device have the advantages that the safe and reliable charging of the capacitor bank is realized, and the service life and the charging and discharging times of the capacitor bank are prolonged. The super capacitor can be charged by high power, large current and reliable operation when low-voltage direct current is provided.
Drawings
FIG. 1 is a schematic diagram of a wireless charging system for a super capacitor;
FIG. 2 shows a receiving side coil L s Resonant capacitor C s The power conversion circuit and the super capacitor C2 (secondary side) are mapped to the transmitting end resonance circuit and the transmitting side coil L p Equivalent circuit diagram after (primary side);
fig. 3 is an equivalent circuit diagram of the LCC-S topology circuit equivalent to the dc power supply.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 3, and the wireless charging system of a super capacitor according to the present embodiment includes an LCC-S topology circuit and a power conversion circuit,
the power conversion circuit comprises a BUCK type switching power supply circuit and a constant current output switch control circuit;
the constant current output switch control circuit comprises a current acquisition circuit, an integral proportion operational amplifier 1, an oscillation circuit 2, a first comparator 3, a voltage acquisition comparison circuit 4, a second comparator 5, an exclusive-OR gate 6 and a totem-pole output circuit 7,
the LCC-S topological circuit is used for providing constant voltage for the constant current output switch control circuit;
the BUCK type switching power supply circuit is used for converting the constant voltage into a constant current signal and inputting the constant current signal to the current acquisition circuit;
the current acquisition circuit is used for acquiring the constant current signal, converting the constant current signal into a voltage signal and sending the voltage signal to the integral proportion operational amplifier 1;
the integral proportion operational amplifier 1 is used for carrying out integral proportion processing on the voltage signal output by the current acquisition circuit, generating a current mean value signal in a period and sending the current mean value signal to the first comparator 3;
the first comparator 3 is used for comparing the current mean value signal in the period with a triangular wave signal sent by the oscillating circuit 2 and outputting a square wave signal to the exclusive-or gate 6;
the voltage acquisition and comparison circuit 4 is used for acquiring the voltage flowing into the super capacitor C2 and sending the voltage flowing into the super capacitor C2 into the second comparator 5;
the second comparator 5 is used for comparing the voltage flowing into the super capacitor C2 with a reference voltage, and outputting a voltage signal to the exclusive-OR gate 6 when the voltage flowing into the super capacitor C2 exceeds the reference voltage;
the exclusive-or gate 6 is used for performing exclusive-or processing on the voltage signal output by the second comparator 5 and the square wave signal and outputting a high level signal;
and the totem-pole output circuit 7 is used for receiving the high-level signal to drive the constant-current output switch control circuit to charge the super capacitor C2.
In the embodiment, the LCC-S topology circuit in the present application is used to provide a power conversion circuit, and corresponds to the DC power supply DC in fig. 3. Vref in fig. 1 denotes a reference voltage. The totem-pole output circuit 7 in fig. 1 is composed of an NPN-type transistor and a PNP-type transistor. The constant voltage output by the LCC-S topology circuit is energy, the energy flows through the BUCK type switch power supply circuit, and the signals flow through the constant current output switch control circuit.
The second embodiment is as follows: in this embodiment, as to the wireless charging system of the super capacitor described in the first embodiment, the current collecting circuit is implemented by using a resistor R1.
The third concrete implementation mode: in this embodiment, the BUCK-type switching power supply circuit includes a switching transistor Q5, a freewheeling diode D5, and an inductor L1,
the grid of the switch tube Q5 is connected with the output end of the totem-pole type output circuit 7, the drain electrode of the switch tube Q5 is connected with the anode of the LCC-S topological circuit, the source electrode of the switch tube Q5 is simultaneously connected with one end of the inductor L1 and the cathode of the freewheeling diode D5, the anode of the diode D5 is simultaneously connected with the cathode of the LCC-S topological circuit and one end of the resistor R1, the other end of the resistor R1 is simultaneously connected with the cathode of the super capacitor C2 and the current signal input end of the integral proportion operational amplifier 1, and the other end of the inductor L1 is simultaneously connected with the anode of the super capacitor C2 and the voltage signal input end of the voltage acquisition comparison circuit 4.
In this embodiment, as shown in fig. 1, the high level signal output by the xor gate 6 drives the gate of the switching transistor Q5 through the totem-pole circuit 7 to charge the super capacitor C2. Totem-pole circuits are conventional and therefore not shown in fig. 1.
The fourth concrete implementation mode: in this embodiment, the LCC-S topology circuit includes a power management module, an embedded module-based high-frequency inverter circuit, a coupling mechanism, and a rectifying and filtering circuit,
the power management module is used for providing direct current for the high-frequency inverter circuit based on the embedded module;
the high-frequency inverter circuit based on the embedded module is used for converting direct current into alternating current and transmitting the alternating current to the coupling mechanism;
the coupling mechanism is used for wirelessly transmitting the alternating current to a rectifying and filtering circuit;
and the rectifying and filtering circuit is used for converting the alternating current into a constant voltage signal.
The fifth concrete implementation mode: in this embodiment, as for the fourth embodiment, the coupling mechanism includes a transmitting end resonant circuit and a transmitting side coil L p Receiving side coil L s And a receiving-end resonance circuit,
the transmitting end resonant circuit comprises a compensation inductor L f And a compensation capacitor C f And a capacitor C p ，
The receiving end resonant circuit comprises a resonant capacitor C s ，
High frequency inverse based on embedded moduleDirect current positive electrode connection compensation inductor L of transformer circuit f One end of (1), compensation inductance L f The other end of the capacitor is simultaneously connected with a compensation capacitor C f One terminal of and a capacitor C p At one end of the first and second arms,
compensation capacitor C is connected to high frequency inverter circuit's direct current negative pole simultaneously based on embedded module f Another end of (1) and a transmitting side coil L p One end of (1), a transmitting side coil L p The other end of the capacitor C is connected with a capacitor C p The other end of the first tube is connected with the second tube,
receiving side coil L s One end of which is connected with a resonance capacitor C s One terminal of (1), a resonance capacitor C s The other end of the first and second coils is connected with an input end of alternating current of the rectifying and filtering circuit and a receiving side coil L s The other end of the rectifier filter circuit is connected with the other input end of the alternating current of the rectifier filter circuit, the anode of the rectifier filter circuit is used as the anode of the LCC-S topological circuit,
and the cathode of the rectification filter circuit is used as the cathode of the LCC-S topological circuit.
In the present embodiment, the coupling mechanism has a function of reducing voltage loss.
The sixth specific implementation mode: in this embodiment, as for the wireless charging system of the super capacitor described in the fourth embodiment, the rectifying and filtering circuit includes diodes D1-D4 and a capacitor C1,
the diode D1 and the diode D2 are connected in series to serve as a branch circuit, the diode D3 and the diode D4 are connected in series to serve as another branch circuit, and the two branch circuits are connected in parallel and then connected in parallel with the capacitor C1.
The seventh embodiment: in this embodiment, the wireless charging system of the super capacitor described in the fourth embodiment is configured such that the high-frequency inverter circuit based on the embedded module is composed of 4 field-effect transistors.
The specific implementation mode is eight: in this embodiment, as for the wireless charging system of the super capacitor described in the fifth embodiment, the relational expression of the coupling mechanism is:
where ω =2 π f, f is the frequency, L f To compensate for inductance of the inductor, C f To compensate for capacitance, C p Is a capacitance value, L s Inductance value of the receiving side coil, C s Is a resonance capacitance value, L p The inductance value of the transmitting side coil.
In this embodiment, a resonance compensation network composed of a transmitting end resonant circuit, a transmitting side coil, a receiving side coil, and a receiving end resonant circuit is made to satisfy the LCC-S compensation topology condition, that is:
the selection of the compensation capacitance and inductance of the compensation topology meets the conditions of the LCC-S compensation topology, so that the equivalent circuit shown in FIG. 3, in which Z is 1 When the resonance condition is satisfied, the value of the impedance refracted to the primary side from the secondary side is as follows:
when the resonance condition is satisfied, the primary side coil current can be equivalent to the current source output current, and the value of the current is approximately satisfied
In order to make the inverter output less reactive power and reduce the inverter and line loss, the whole circuit should exhibit pure resistance as viewed from the primary side topology input end, and the input impedance is
In conjunction with equation 1, the above equation can be simplified as:
can obtain the product
Where M is the mutual inductance between the transmitting side coil and the receiving side coil, R L Is the equivalent impedance of the load.
When R is L ＞＞ω 2 M 2 When the temperature of the water is higher than the set temperature,
i.e. the voltage gain of the resonance compensation topology
As can be seen from the voltage gain formula, when the frequency of the high-frequency voltage is the resonant frequency and the load equivalent resistance changes within a certain range, the output voltage of the wireless power transmission system is quasi-constant. Because the load is a super capacitor and the super capacitor needs to be fully charged in the shortest possible time and the safety, reliability and service life of the super capacitor are ensured, the output voltage of the wireless electric energy transmission system can be charged for the super capacitor load only through the control of the power conversion circuit at the receiving end.
The specific implementation method nine: in this embodiment, the receiving side coil L is a coil of the super capacitor in the wireless charging system according to the eighth embodiment s Resonant capacitor C s The power conversion circuit and the super capacitor C2 are mapped to the transmitting end resonance circuit and the transmitting side coil L p Lateral impedance value Z 1 Expressed as:
where M is the mutual inductance between the transmitting side coil and the receiving side coil, R L Is the equivalent impedance of the super capacitor.
The detailed implementation mode is ten: in this embodiment, the ninth embodiment is directed to a wireless charging system for a super capacitorSystem, impedance Z as viewed from right of high frequency inverter circuit based on embedded module in Comprises the following steps:
wherein j is a plurality;
equation 1, equation 3 reduces to:
the concrete implementation mode eleven: in this embodiment, the coupling mechanism outputs an ac voltage value to the supercapacitor wireless charging system according to the tenth embodiment
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
the constant voltage value is output by the LCC-S topological circuit.
When R is L ＞＞ω 2 M 2 When the temperature of the water is higher than the set temperature,
the voltage gain G of the LCC-S topology circuit is as follows:
Claims (11)
1. a wireless charging system of a super capacitor is characterized in that the system comprises an LCC-S topological circuit and a power conversion circuit,
the power conversion circuit comprises a BUCK type switching power supply circuit and a constant current output switch control circuit;
the constant current output switch control circuit comprises a current acquisition circuit, an integral proportion operational amplifier (1), an oscillating circuit (2), a first comparator (3), a voltage acquisition comparison circuit (4), a second comparator (5), an exclusive-OR gate (6) and a totem-pole output circuit (7),
the LCC-S topology circuit is used for providing constant voltage for the constant current output switch control circuit;
the BUCK type switching power supply circuit is used for converting the constant voltage into a constant current signal and inputting the constant current signal to the current acquisition circuit;
the current acquisition circuit is used for acquiring the constant current signal, converting the constant current signal into a voltage signal and sending the voltage signal to the integral proportion operational amplifier (1);
the integral proportion operational amplifier (1) is used for carrying out integral proportion processing on the voltage signal output by the current acquisition circuit, generating a current mean value signal in a period and sending the current mean value signal to the first comparator (3);
the first comparator (3) is used for comparing the current mean value signal in the period with a triangular wave signal sent by the oscillating circuit (2) and outputting a square wave signal to the exclusive-OR gate (6);
the voltage acquisition and comparison circuit (4) is used for acquiring the voltage flowing into the super capacitor C2 and sending the voltage flowing into the super capacitor C2 into the second comparator (5);
the second comparator (5) is used for comparing the voltage flowing into the super capacitor C2 with a reference voltage, and outputting a voltage signal to an exclusive-OR gate (6) when the voltage flowing into the super capacitor C2 exceeds the reference voltage;
the exclusive-OR gate (6) is used for carrying out exclusive-OR processing on the voltage signal output by the second comparator (5) and the square wave signal and outputting a high level signal;
and the totem-pole output circuit (7) is used for receiving the high-level signal to drive the constant-current output switch control circuit to charge the super capacitor C2.
2. The wireless charging system of the super capacitor as claimed in claim 1, wherein the current collection circuit is implemented by a resistor R1.
3. The wireless charging system of super capacitor as claimed in claim 2, wherein the BUCK type switching power supply circuit comprises a switching tube Q5, a freewheeling diode D5 and an inductor L1,
the grid electrode of the switch tube Q5 is connected with the output end of the totem-pole type output circuit (7), the drain electrode of the switch tube Q5 is connected with the anode of the LCC-S topological circuit, the source electrode of the switch tube Q5 is simultaneously connected with one end of the inductor L1 and the cathode of the freewheeling diode D5, the anode of the diode D5 is simultaneously connected with the cathode of the LCC-S topological circuit and one end of the resistor R1, the other end of the resistor R1 is simultaneously connected with the cathode of the super capacitor C2 and the current signal input end of the integral proportion operational amplifier (1), and the other end of the inductor L1 is simultaneously connected with the anode of the super capacitor C2 and the voltage signal input end of the voltage acquisition comparison circuit (4).
4. The wireless charging system for the super capacitor as claimed in claim 3, wherein the LCC-S topology circuit comprises a power management module, an embedded module-based high frequency inverter circuit, a coupling mechanism and a rectifying and filtering circuit,
the power management module is used for providing direct current for the high-frequency inverter circuit based on the embedded module;
the high-frequency inverter circuit based on the embedded module is used for converting direct current into alternating current and transmitting the alternating current to the coupling mechanism;
the coupling mechanism is used for wirelessly transmitting the alternating current to a rectification filter circuit;
and the rectifying and filtering circuit is used for converting the alternating current into a constant voltage signal.
5. The wireless charging system of claim 4, wherein the coupling mechanism comprises a transmitting end resonant circuit and a transmitting side coil L p Receiving side coil L s And a resonance circuit at the receiving end, and,
the resonant circuit at the transmitting end comprises a compensation inductor L f And a compensation capacitor C f And a capacitor C p ，
The receiving end resonant circuit comprises a resonant capacitor C s ，
Direct current positive electrode connection compensation inductor L of high-frequency inverter circuit based on embedded module f One end of (1), compensation inductance L f The other end of the capacitor is simultaneously connected with a compensation capacitor C f One terminal of and a capacitor C p At one end of the first and second arms,
DC negative electrode of high-frequency inverter circuit based on embedded module is connected with compensation capacitor C at the same time f Another end of (1) and a transmitting side coil L p One end of (2), a transmitting side coil L p The other end of the capacitor C is connected with a capacitor C p The other end of the first tube is connected with the second tube,
receiving side coil L s One end of which is connected with a resonance capacitor C s One terminal of (1), a resonance capacitor C s The other end of the first and second coils is connected with an input end of alternating current of the rectifying and filtering circuit and a receiving side coil L s The other end of the rectifier filter circuit is connected with the other input end of the alternating current of the rectifier filter circuit, the anode of the rectifier filter circuit is used as the anode of the LCC-S topological circuit,
and the negative electrode of the rectification filter circuit is used as the negative electrode of the LCC-S topology circuit.
6. The wireless charging system of super capacitor as claimed in claim 4,
the rectifying and filtering circuit comprises diodes D1-D4 and a capacitor C1,
the diode D1 and the diode D2 are connected in series to serve as a branch circuit, the diode D3 and the diode D4 are connected in series to serve as another branch circuit, and the two branch circuits are connected in parallel and then connected in parallel with the capacitor C1.
7. The wireless charging system for the super capacitor as claimed in claim 4, wherein the embedded module-based high-frequency inverter circuit is composed of 4 field effect transistors.
8. The wireless charging system for the super capacitor as claimed in claim 5, wherein the relationship of the coupling mechanism is as follows:
where ω =2 π f, f is the frequency, L f To compensate for inductance of the inductor, C f To compensate for capacitance, C p Is a capacitance value, L s Inductance value of the receiving side coil, C s Is a resonance capacitance value, L p The inductance value of the transmitting side coil.
9. The wireless charging system of claim 8, wherein the receiving side coil L is a coil L s Resonant capacitor C s The power conversion circuit and the super capacitor C2 are mapped to the transmitting end resonance circuit and the transmitting side coil L p Lateral impedance value Z 1 Expressed as:
where M is the mutual inductance between the transmitting side coil and the receiving side coil, R L Is the equivalent impedance of the super capacitor.
10. The wireless charging system for the super capacitor as claimed in claim 9, wherein the impedance Z viewed from the right of the embedded module-based high frequency inverter circuit in Comprises the following steps:
wherein j is a plurality;
combining equation 2, we get:
11. the wireless charging system of claim 10, wherein the coupling mechanism outputs an ac voltage value
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
a constant voltage value output by the LCC-S topological circuit;
when R is L ＞＞ω 2 M 2 When the temperature of the water is higher than the set temperature,
the voltage gain G of the LCC-S topology circuit is as follows:
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