CN114784996A - Low-voltage high-current wireless charging system and cooperative control method thereof - Google Patents
Low-voltage high-current wireless charging system and cooperative control method thereof Download PDFInfo
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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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- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
Abstract
The invention relates to a low-voltage large-current wireless charging system and a cooperative control method thereof, belonging to the technical field of wireless charging.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a low-voltage high-current wireless charging system and a cooperative control method thereof.
Background
In recent years, the wireless charging technology has attracted attention and research by virtue of convenience, safety, natural electrical isolation and the like, and is very suitable for being applied to special occasions that a power supply and electric equipment have relative displacement, are inconvenient or cannot be directly connected, and have sealing requirements and the like. At present, a great deal of research results and engineering experience are obtained in hundreds of thousands of even thousands of high-voltage systems such as electric automobiles and rail transit. With the continuous and deep research on the wireless charging technology, the application field of the wireless charging technology is expanded to low-voltage application occasions such as underwater application, automatic guided vehicles, unmanned aerial vehicles and the like.
In these low voltage applications, considerable charging power needs to be maintained in order to ensure the charging speed of the wireless charging systems, and the voltage levels of these systems are relatively low, resulting in large currents being generated in the system power loop. Therefore, the wireless charging system applied to the low voltage occasion has the following two problems as compared with the known wireless charging system.
A first problem is that the equivalent load resistance of a low voltage wireless charging system is small, typically below 1 ohm, or even smaller, which deviates far from the optimal load resistance value of the system, which results in low inherent transmission efficiency of the system coupling mechanism. Another problem is that the large currents of the power loop cause large conduction losses in the MOSFETs, diodes, inductors, capacitors and other components, which can lead to reduced reliability and efficiency of the system.
Disclosure of Invention
The invention aims to provide a low-voltage large-current wireless charging system and a cooperative control method thereof, which are used for realizing constant power and maximum efficiency tracking control through primary and secondary cooperative control, improving the system efficiency and reducing the conduction loss of system elements.
In order to achieve the purpose, the invention provides the following scheme:
a low-voltage high-current wireless charging system comprises: the device comprises a quasi-Z source inverter circuit, a resonance compensation circuit, a primary coil, a secondary coil, a current-doubling synchronous rectification circuit, a load battery pack, a first control module, a second control module, a first wireless communication circuit and a second wireless communication circuit;
the input end of the quasi-Z source inverter circuit inputs direct current of a power supply end, the output end of the quasi-Z source inverter circuit is connected with the input end of a primary side circuit of the resonance compensation circuit, and a primary side coil is connected with the output end of the primary side circuit of the resonance compensation circuit; the input end of a secondary side circuit of the resonance compensation circuit is connected with the secondary side coil, the output end of the secondary side circuit of the resonance compensation circuit is connected with the input end of the current-doubling synchronous rectification circuit, and the output end of the current-doubling synchronous rectification circuit is connected with the load battery pack;
the quasi-Z source inverter circuit is used for converting direct current into high-frequency alternating current and transmitting the high-frequency alternating current to a primary side circuit of the resonance compensation circuit; the resonance compensation circuit is used for coupling the high-frequency alternating current of the primary circuit to the secondary circuit through the primary coil and the secondary coil in sequence, and transmitting the high-frequency alternating current to the current-doubling synchronous rectification circuit after compensation; the current-doubling synchronous rectification circuit is used for converting the compensated high-frequency alternating current into direct current at a load end and then charging the load battery pack;
the first control module is respectively connected with the quasi-Z source inverter circuit and the first wireless communication circuit; the second control module is respectively connected with the current-doubling synchronous rectification circuit, the load battery pack and the second wireless communication circuit; the first wireless communication circuit is wirelessly connected with the second wireless communication circuit;
the second control module is used for acquiring the voltage and the current of the load battery pack and transmitting the voltage and the current to the first control module through the second wireless communication circuit and the first wireless communication circuit in sequence; the first control module is used for acquiring direct current voltage input by the input end of the quasi-Z source inverter circuit and adjusting the direct duty ratio of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack so as to charge the load battery pack at constant power;
the first control module is further used for transmitting the direct-current voltage and the direct-current duty ratio to the second control module sequentially through the first wireless communication circuit and the second wireless communication circuit; the second control module is also used for adjusting the synchronous rectification duty ratio according to the voltage and the current of the load battery pack, the direct current voltage and the direct current duty ratio, so that the equivalent load resistance of the current doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is ensured to work at the maximum efficiency point all the time.
Optionally, the quasi-Z source inverter circuit includes: diode DzInductor Lz1Inductor Lz2Capacitor Cz1Capacitor Cz2And a full bridge inverter circuit;
inductor Lz1One end of which is connected with the positive pole of the power supply end, an inductor Lz1Respectively connected with a diode DzAnode and capacitor Cz1Is connected with one end of the connecting rod; diode DzRespectively with a capacitor Cz2One terminal of (A) and an inductance Lz2Is connected with one end of the connecting rod; capacitor Cz2The other end of the full-bridge inverter circuit is respectively connected with the negative electrode of a power supply end and the first input end of the full-bridge inverter circuit; inductor Lz2The other end of each of the first and second capacitors is connected to a capacitor Cz1The other end of the second inverter is connected with a second input end of the full-bridge inverter circuit; two output ends of the full-bridge inverter circuit are respectively connected with two ends of a primary side circuit of the resonance compensation circuit; the control end of the full-bridge inverter circuit is connected with the first control module.
Optionally, the current doubler synchronous rectification circuit includes: metal oxide semiconductor field effect transistor Sr1Metal oxide semiconductor field effect transistor Sr2Metal oxide semiconductor field effect transistor Sr3A metal oxide semiconductor field effect transistor Sr4Inductor Lr1And an inductance Lr2；
Metal oxide semiconductor field effect transistor Sr1The drain of the second transistor is connected with one end of the secondary circuit of the resonance compensation circuit, and the metal oxide semiconductor field effect transistor Sr1Respectively with the metal-oxide-semiconductor field effect transistor Sr3Drain electrode and inductor L ofr1Is connected with one end of the connecting rod; metal oxide semiconductor field effect transistor Sr3Source and metal oxide semiconductor field effect transistor Sr4Is connected with the source electrode of the transistor; inductor Lr1Another end of (2) and an inductor Lr2Is connected with one end of the connecting rod;
inductor Lr2The other end of the first and second electrodes are respectively connected with the metal oxide semiconductor field effect transistor Sr4Drain of (1) and metal oxide semiconductor field effect transistor Sr2Is connected to the source of (a); metal oxide semiconductor field effect transistorSr2The drain electrode of the resonant compensation circuit is connected with the other end of the secondary side circuit of the resonant compensation circuit;
metal oxide semiconductor field effect transistor Sr1Gate of (1), metal oxide semiconductor field effect transistor (S)r2Gate of (1), metal oxide semiconductor field effect transistor (S)r3Gate of (1), metal oxide semiconductor field effect transistor (S)r4The grid electrodes of the first control module and the second control module are all connected.
Optionally, the resonance compensation circuit includes: primary side compensation inductance LfPrimary side compensation capacitor CfPrimary side compensation capacitor CpAnd secondary side compensation capacitor Cs；
Primary side compensation inductance LfIs connected with the first output end of the full-bridge inverter circuit, and the primary side compensation inductor LfAnd the other end of the primary side compensation capacitor CfPrimary side compensation capacitor CpIs connected with one end of the connecting rod; one end of the primary coil and the primary compensation capacitor CfIs connected with the other end of the primary coil, and the other end of the primary coil is connected with the primary compensation capacitor CpThe other end of the connecting rod is connected;
one end of the secondary coil is respectively connected with a secondary compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr1Is connected with the drain electrode of the transistor; the other end of the secondary coil is respectively connected with a secondary compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr2Is connected to the drain of (c).
Optionally, the first control module includes: the circuit comprises a first sampling circuit, a first control circuit and a first driving circuit;
the input end of the first sampling circuit is connected with the input end of the quasi-Z source inverter circuit, and the output end of the first sampling circuit is connected with the first input end of the first control circuit; the first sampling circuit is used for collecting the direct current voltage input by the input end of the quasi-Z source inverter circuit and transmitting the direct current voltage to the first control circuit;
the second input end and the first output end of the first control circuit are connected with the first wireless communication circuit, the second output end of the first control circuit is connected with the control end of the first driving circuit, and the driving end of the first driving circuit is connected with the control end of the quasi-Z source inverter circuit; the first control circuit is used for obtaining a through duty ratio regulating value of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack, and regulating the through duty ratio of the quasi-Z source inverter circuit to the through duty ratio regulating value through the first driving circuit.
Optionally, the second control module includes: the second sampling circuit, the second control circuit and the second drive circuit;
the input end of the second sampling circuit is connected with the load battery pack, and the output end of the second sampling circuit is connected with the first input end of the second control circuit; the second sampling circuit is used for collecting the voltage and the current of the load battery pack and transmitting the voltage and the current of the load battery pack to the second control circuit;
a second input end and a first output end of the second control circuit are connected with the second wireless communication circuit, a second output end of the second control circuit is connected with a control end of the second driving circuit, and a driving end of the second driving circuit is connected with a control end of the current-doubling synchronous rectification circuit; the second control circuit is used for obtaining the voltage and the current of the load battery pack and adjusting the synchronous rectification duty ratio according to the voltage and the current of the load battery pack, the direct current voltage and the direct current duty ratio, so that the equivalent load resistance of the current-doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is guaranteed to work at the maximum efficiency point all the time.
Optionally, the wireless charging system further includes: a third sampling circuit and a comparison circuit;
the input end of the third sampling circuit is connected with the input end of the current-doubling synchronous rectification circuit, the output end of the third sampling circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the third input end of the second control circuit;
the third sampling circuit is used for collecting the input voltage of the current-multiplying synchronous rectification circuit; the comparison circuit is used for generating a control time sequence signal according to the input voltage of the current-doubling synchronous rectification circuit and transmitting the control time sequence signal to the second control circuit.
Optionally, the quasi-Z source inverter circuit includes two working modes, namely a direct-connection mode and a non-direct-connection mode;
the current-doubling synchronous rectification circuit comprises a positive half-cycle synchronous rectification mode and a follow current working mode, and a negative half-cycle synchronous rectification mode and a follow current working mode.
A cooperative control method of a low-voltage high-current wireless charging system applies the low-voltage high-current wireless charging system, and comprises the following steps:
presetting an initial through duty ratio and an initial synchronous rectification duty ratio which enable the low-voltage large-current wireless charging system to be in a charging state;
acquiring the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit;
if the voltage of the current load battery pack is smaller than the cut-off voltage, respectively calculating the current resistance of the load battery pack and the current mutual inductance of the primary and secondary side coils according to the initial through duty ratio, the voltage and the current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit;
calculating the current optimal duty ratio of the current-doubling synchronous rectification circuit according to the current resistance of the load battery pack and the current mutual inductance of the primary side coil and the secondary side coil, and controlling the synchronous rectification duty ratio of the current-doubling synchronous rectification circuit to be equal to the current optimal duty ratio so as to enable the equivalent load resistance of the current-doubling synchronous rectification circuit to be equal to the current system optimal load;
calculating output power according to the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit;
performing PI control according to the output power, the voltage and current of the current load battery pack and the current mutual inductance of the primary and secondary side coils, and adjusting a direct duty ratio to perform constant-power charging on the load battery pack;
and if the voltage of the current load battery pack is greater than or equal to the cut-off voltage, the whole charging process is finished.
Optionally, the current optimal duty ratio of the current-doubling synchronous rectification circuit is calculated according to the current resistance of the load battery pack and the current mutual inductance of the primary and secondary coils, and the method specifically includes:
according to the current mutual inductance of the primary and secondary side coils, using a formula
Calculating the optimal load R of the current systemopt(ii) a Where ω is the angular frequency of resonance of the system, Rp、RsAnd RLfAre respectively primary side coils LpSecondary winding LsAnd primary side compensation inductance LfM is the current mutual inductance of the primary coil and the secondary coil;
according to the optimal load R of the current systemoptUsing the formula
Calculating the current optimal duty ratio Ds-opt(ii) a Wherein R isoIs the equivalent resistance of the load cell stack.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a low-voltage large-current wireless charging system and a cooperative control method thereof.A first control module and a second control module are connected and perform original and secondary data and information bidirectional interaction in a wireless mode, the first control module controls the direct duty ratio of a quasi-Z source inverter circuit to charge a load battery pack at constant power, and the second control module controls the synchronous rectification duty ratio to ensure that the equivalent load resistance of a current-doubling synchronous rectification circuit tracks the optimal load of the system in real time, so that the system always works at the maximum efficiency point, and the constant power and maximum efficiency tracking control is realized through the original and secondary cooperative control, thereby improving the system efficiency and reducing the conduction loss of system elements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a low-voltage high-current wireless charging system provided by the invention;
FIG. 2 is an equivalent circuit diagram of the quasi-Z source inverter circuit according to the present invention; FIG. 2(a) is a through-state equivalent circuit, and FIG. 2(b) is a non-through-state equivalent circuit;
FIG. 3 is a circuit diagram of different working modes of the current-doubling synchronous rectification circuit provided by the present invention; fig. 3(a) is an equivalent circuit of a synchronous rectification operating state of a positive half period, fig. 3(b) is an equivalent circuit of a freewheeling operating state of a positive half period, fig. 3(c) is an equivalent circuit of a synchronous rectification operating state of a negative half period, and fig. 3(d) is an equivalent circuit of a freewheeling operating state of a negative half period;
fig. 4 is a waveform diagram of different working modes of the current-doubling synchronous rectification circuit provided by the invention;
FIG. 5 is a graph showing the trend of the current gain GI and the load equivalent resistance gain GR of the current-doubling synchronous rectification circuit provided by the present invention along with Ds;
fig. 6 is a flow chart of a cooperative control mechanism of the quasi-Z source inverter circuit and the current-doubling synchronous rectification circuit provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide a low-voltage large-current wireless charging system and a cooperative control method thereof, which are used for realizing constant power and maximum efficiency tracking control through primary and secondary cooperative control, improving the system efficiency and reducing the conduction loss of system elements.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example 1
An embodiment of the present invention provides a low-voltage large-current wireless charging system, as shown in fig. 1, the low-voltage large-current wireless charging system includes: the device comprises a quasi-Z source inverter circuit, a resonance compensation circuit, a primary coil, a secondary coil, a current-doubling synchronous rectification circuit, a load battery pack, a first control module, a second control module, a first wireless communication circuit and a second wireless communication circuit.
The input end of the quasi-Z source inverter circuit inputs direct current of a power supply end, the output end of the quasi-Z source inverter circuit is connected with the input end of a primary side circuit of the resonance compensation circuit, and a primary side coil is connected with the output end of the primary side circuit of the resonance compensation circuit; the input end of a secondary side circuit of the resonance compensation circuit is connected with the secondary side coil, the output end of the secondary side circuit of the resonance compensation circuit is connected with the input end of the current-doubling synchronous rectification circuit, and the output end of the current-doubling synchronous rectification circuit is connected with the load battery pack; the quasi-Z source inverter circuit is used for converting the direct current into high-frequency alternating current and transmitting the high-frequency alternating current to a primary side circuit of the resonance compensation circuit; the resonance compensation circuit is used for coupling the high-frequency alternating current of the primary circuit to the secondary circuit through the primary coil and the secondary coil in sequence, and transmitting the high-frequency alternating current to the current-doubling synchronous rectification circuit after compensation; the current-doubling synchronous rectification circuit is used for converting the compensated high-frequency alternating current into direct current at a load end and then charging the load battery pack.
The first control module is respectively connected with the quasi Z source inverter circuit and the first wireless communication circuit; the second control module is respectively connected with the current-doubling synchronous rectification circuit, the load battery pack and the second wireless communication circuit; the first wireless communication circuit is wirelessly connected with the second wireless communication circuit. The second control module is used for acquiring the voltage and the current of the load battery pack and transmitting the voltage and the current to the first control module through the second wireless communication circuit and the first wireless communication circuit in sequence; the first control module is used for acquiring direct current voltage input by the input end of the quasi-Z source inverter circuit and adjusting the direct duty ratio of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack so as to charge the load battery pack at constant power. The first control module is further used for transmitting the direct current voltage and the direct current duty ratio to the second control module through the first wireless communication circuit and the second wireless communication circuit in sequence; the second control module is also used for adjusting the synchronous rectification duty ratio according to the voltage and current of the load battery pack, the direct current voltage and the direct duty ratio, so that the equivalent load resistance of the current doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is guaranteed to work at the maximum efficiency point all the time.
The first control circuit (control circuit 1 in fig. 1) and the second control circuit (control circuit 2 in fig. 1) are connected and perform bidirectional interaction of primary and secondary side data and information in a wireless mode. The control circuit 1 carries out operation processing on signals fed back by the sampling circuit 1 and the wireless communication circuit 1, and controls the Z-source inverter circuit through the driving circuit 1, the control circuit 2 carries out operation processing on signals fed back by the sampling circuit 2 and the wireless communication circuit 2, and the current-multiplying synchronous rectification circuit is controlled through the driving circuit 2 based on control time sequence signals generated by the sampling circuit 3 and the comparison circuit.
The low voltage is a voltage of 1000V or less to ground. The high voltage is a power transmission and transformation voltage of 1000 volts or more or a distribution and utilization voltage of 380 volts or more. The low voltage means that the AC voltage of a distribution line is below 1000V or the DC voltage is below 1500V. The high-voltage power is an electric service wire of which the alternating voltage of a distribution line is more than 1000V or the direct voltage is more than 1500V.
The primary side of the low-voltage large-current wireless charging system adopts the quasi-Z-source inverter circuit, the traditional primary side DC/DC conversion circuit and the traditional inverter circuit are replaced, the direct current input voltage of the inverter circuit can be improved by adjusting the duty ratio of the quasi-Z-source inverter circuit, the current of a power loop is reduced, the heat productivity of the system is reduced, and the efficiency of the system is improved. The secondary side adopts a current-doubling synchronous rectification circuit to replace a traditional diode rectification circuit and a secondary side DC/DC conversion circuit, and by adjusting the duty ratio of the current-doubling synchronous rectification circuit, the equivalent load resistance can be adjusted in a large range and the optimal load of the system can be tracked in real time, so that the system always works at the maximum efficiency point. The system realizes constant power and maximum efficiency tracking control through original and secondary side cooperative control. The invention has the advantages of small system power loop loss, high transmission efficiency, small input and output ripples and the like, and is very suitable for low-voltage and large-current application occasions.
Illustratively, the quasi-Z source inverter circuit includes: diode DzAn inductor Lz1Inductor Lz2Capacitor Cz1Capacitor Cz2And a full bridge inverter circuit. Inductor Lz1Is connected with the positive electrode of the power supply terminal, and an inductor Lz1The other end of the diode D is respectively connected with the diode DzAnode and capacitor Cz1Is connected with one end of the connecting rod; diode DzRespectively with a capacitor Cz2One terminal of (1) and an inductance Lz2Is connected with one end of the connecting rod; capacitor Cz2The other end of the full-bridge inverter circuit is respectively connected with the negative electrode of a power supply end and the first input end of the full-bridge inverter circuit; inductor Lz2The other end of each of the first and second capacitors is connected to a capacitor Cz1The other end of the second inverter is connected with a second input end of the full-bridge inverter circuit; two output ends of the full-bridge inverter circuit are respectively connected with two ends of a primary side circuit of the resonance compensation circuit; the control end of the full-bridge inverter circuit is connected with the first control module.
Referring to fig. 1, the full-bridge inverter circuit includes a mosfet Sz1A metal oxide semiconductor field effect transistor Sz2A metal oxide semiconductor field effect transistor Sz3And a metal oxide semiconductor field effect transistor Sz4。
The quasi-Z source inverter circuit comprises a direct connection working mode and a non-direct connection working mode.
Fig. 2 is an equivalent circuit diagram of the operating state of the primary quasi-Z source inverter circuit of the present invention, in which fig. 2(a) is a through-state equivalent circuit, and fig. 2(b) is a non-through-state equivalent circuit. By means of a pair of inductors Lz1And Lz2Voltage-second balance analysis of the inverterzExpressed as:
output voltage root mean square value V of inverter circuitinvExpressed as:
the invention can adjust the direct duty ratio D of the quasi-Z source inverter circuitpIncreasing the DC bus voltage V of the inverter circuitzAnd further regulate the output voltage of the inverter circuit.
Illustratively, the current doubler synchronous rectification circuit comprises: metal oxide semiconductor field effect transistor Sr1Metal oxide semiconductor field effect transistor Sr2Metal oxide semiconductor field effect transistor Sr3Metal oxide semiconductor field effect transistor Sr4Inductor Lr1And an inductance Lr2. Metal oxide semiconductor field effect transistor Sr1The drain of the second transistor is connected with one end of the secondary circuit of the resonance compensation circuit, and the metal oxide semiconductor field effect transistor Sr1Respectively with the source of the MOSFET Sr3Drain electrode of (1) and inductor Lr1Is connected with one end of the connecting rod; metal oxide semiconductor field effect transistor Sr3Source and metal oxide semiconductor field effect transistor Sr4Is connected to the source of (a); inductor Lr1Another end of (2) and an inductor Lr2Is connected at one end. Inductor Lr2The other end of the first and second electrodes are respectively connected with the metal oxide semiconductor field effect transistor Sr4Drain electrode of and metal oxide semiconductor field effect transistor Sr2Is connected to the source of (a); metal oxide semiconductor field effect transistor Sr2Is connected to the other end of the secondary side circuit of the resonance compensation circuit. Metal oxide semiconductor field effect transistor Sr1Gate of (1), metal oxide semiconductor field effect transistor Sr2Gate of (1), metal oxide semiconductor field effect transistor Sr3Gate of (1), metal oxide semiconductor field effect transistor (S)r4The grid electrodes of the grid electrodes are all connected with the second control module.
The current-doubling synchronous rectification circuit comprises a synchronous rectification mode and a follow current working mode of a positive half period, and a synchronous rectification mode and a follow current working mode of a negative half period. In all working modes of the current-doubling synchronous rectification circuit, when the MOSFET anti-parallel diode needs to be conducted, the MOSFET is driven to conduct reversely to replace the conduction of the diode, so that the conduction loss is reduced.
Fig. 3 is an equivalent circuit diagram of the operating state of the secondary side current-doubling synchronous rectification circuit of the invention, wherein fig. 3(a) and (b) are respectively equivalent circuits of the operating state of the synchronous rectification and the freewheeling in the positive half period, and fig. 3(c) and (d) are respectively equivalent circuits of the operating state of the synchronous rectification and the freewheeling in the negative half period.
FIG. 4 is a waveform diagram of different working modes of the secondary side current-doubling synchronous rectification circuit of the present invention, as shown in FIG. 4, the input voltage V of the current-doubling synchronous rectification circuit is usedrecPositive half period (V)rec>0) Working procedure, e.g. by controlling pulse VGS-Sr1Drive Sr1Forward conduction by control pulse VGS-Sr2、VGS-Sr4Drive Sr2、Sr4And (4) reverse conduction, wherein the current-doubling synchronous rectification circuit works in a synchronous rectification mode, as shown in fig. 3 (a). In the synchronous rectification mode, the current-doubling synchronous rectification circuit passes through Sr1、Sr2And Sr4With a current Ir1Charging the battery, inductor Lr2By Sr4With a current Ir2For charging the battery, inductor Lr1Will also be influenced by the current Ir1Input current I of charging and current-doubling synchronous rectification circuitrecIs Ir1. By controlling the pulse VGS-Sr1、VGS-Sr2Off Sr1、Sr2By controlling the pulse VGS-Sr3And VGS-Sr4Drive Sr3、Sr4And (4) reverse conduction, wherein the current-doubling synchronous rectification circuit works in a freewheeling mode, as shown in fig. 3 (b). In freewheel mode, two inductors Lr1、Lr2Respectively pass through Sr3、Sr4For charging the battery, the input current I of the current-doubling synchronous rectification circuit is not provided with a current pathrecIs 0.
Similarly, the input voltage V of the current-doubling synchronous rectification circuitrecNegative half period (V)rec<0) Two operating states of synchronous rectification and freewheeling are also included as shown in fig. 3(c) and (d).
The output current I of the current-doubling synchronous rectification circuit provided by the inventionoFrom two inductor currents Ir1、Ir2Superimposed, and can be represented as:
equivalent input power of current-doubling synchronous rectification circuitResistance RrecCan be expressed as:
by adjusting the duty ratio D of the current-doubling synchronous rectification circuitsTo make the equivalent input resistance RrecEqual to the system optimum load RoptThereby realizing the maximum efficiency tracking control of the system and the optimal duty ratio D of the current-doubling synchronous rectification circuits-optComprises the following steps:
to further illustrate the characteristics of the current doubler synchronous rectification circuit proposed by the present invention, the current gain G of the current doubler synchronous rectification circuit is definedIIs IoAnd IrecRatio of (d), load equivalent resistance gain GRIs RrecAnd RoBoth are DsAs a function of (c). FIG. 5 shows the current gain G of the secondary-side current-doubling synchronous rectification circuit of the present inventionIAnd load equivalent resistance gain GRWith DsTrend graph, as shown in FIG. 5, by adjusting DsCan greatly change GIAnd GRTherefore, the problem that the equivalent resistance of the load deviates from the optimal load of the system is solved.
One embodiment of the present invention, when DsAt 0.3, GIAnd GR4.89 and 23.94 respectively. The current-doubling synchronous rectification circuit with the advantage is very suitable for a wireless charging system with high-current output, and can limit the current in a coil and a resonance compensation circuit and increase the output current, so that the loss of the system is reduced. More importantly, DsThe equivalent input impedance of the current-multiplying synchronous rectification circuit can be greatly changed to enable the equivalent input impedance to follow the optimal load of the system in a large range, and therefore the transmission efficiency of the wireless charging system is optimized.
Illustratively, the resonance compensation circuit includes: primary side compensation inductance LfPrimary side compensation electricityContainer CfPrimary side compensation capacitor CpPrimary coil LpSecondary winding LsAnd secondary side compensation capacitor Cs. Primary side compensation inductance LfIs connected with the first output end of the full-bridge inverter circuit, and the primary side compensation inductor LfAnd the other end of the primary side compensation capacitor CfPrimary side compensation capacitor CpIs connected with one end of the connecting rod; primary coil LpOne end of and the primary side compensation capacitor CfIs connected to the other end of the primary winding LpAnother end of the primary side compensating capacitor CpThe other end of the connecting rod is connected. Secondary winding LsOne end of which is respectively connected with the secondary side compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr1Is connected with the drain electrode of the transistor; secondary winding LsThe other end of the capacitor is respectively connected with a secondary side compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr2Is connected to the drain of (1).
Illustratively, the first control module includes: the circuit comprises a first sampling circuit, a first control circuit and a first driving circuit. The input end of the first sampling circuit is connected with the input end of the quasi-Z source inverter circuit, and the output end of the first sampling circuit is connected with the first input end of the first control circuit; the first sampling circuit is used for collecting the direct current voltage input by the input end of the quasi-Z source inverter circuit and transmitting the direct current voltage to the first control circuit. The second input end and the first output end of the first control circuit are connected with the first wireless communication circuit, the second output end of the first control circuit is connected with the control end of the first driving circuit, and the driving end of the first driving circuit is connected with the control end of the quasi-Z source inverter circuit; the first control circuit is used for obtaining a through duty ratio regulating value of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack, and regulating the through duty ratio of the quasi-Z source inverter circuit to the through duty ratio regulating value through the first driving circuit.
Illustratively, the second control module includes: the second sampling circuit, the second control circuit and the second drive circuit. The input end of the second sampling circuit is connected with the load battery pack, and the output end of the second sampling circuit is connected with the first input end of the second control circuit; the second sampling circuit is used for collecting the voltage and the current of the load battery pack and transmitting the voltage and the current of the load battery pack to the second control circuit. A second input end and a first output end of the second control circuit are connected with the second wireless communication circuit, a second output end of the second control circuit is connected with a control end of the second driving circuit, and a driving end of the second driving circuit is connected with a control end of the current-doubling synchronous rectification circuit; the second control circuit is used for obtaining the voltage and the current of the load battery pack and adjusting the synchronous rectification duty ratio according to the voltage and the current of the load battery pack, the direct current voltage and the direct current duty ratio, so that the equivalent load resistance of the current-doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is guaranteed to work at the maximum efficiency point all the time.
Exemplarily, the low-voltage high-current wireless charging system further includes: a third sampling circuit and a comparison circuit. The input end of the third sampling circuit is connected with the input end of the current-doubling synchronous rectification circuit, the output end of the third sampling circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the third input end of the second control circuit. The third sampling circuit is used for collecting the input voltage of the current-doubling synchronous rectification circuit; the comparison circuit is used for generating a control time sequence signal according to the input voltage of the current-doubling synchronous rectification circuit and transmitting the control time sequence signal to the second control circuit.
The invention discloses a low-voltage large-current wireless charging system, wherein a quasi-Z source inverter circuit is adopted on a primary side of the system to replace a traditional primary side DC/DC conversion circuit and an inverter circuit, so that the direct current input voltage of the inverter circuit is improved, the current of a power loop is reduced, the heat productivity of the system is reduced, and the efficiency of the system is improved. The secondary side of the system adopts the current-doubling synchronous rectification circuit to replace the traditional diode rectification circuit and the secondary side DC/DC conversion circuit, and the equivalent load resistance can be adjusted in a large range and the optimal load of the system can be tracked in real time by adjusting the duty ratio of the current-doubling synchronous rectification circuit, so that the system always works at the maximum efficiency point. The system realizes constant power and maximum efficiency tracking control through original and secondary side cooperative control. The invention has the advantages of small system power loop loss, high transmission efficiency, small input and output ripples and the like, and is very suitable for low-voltage and large-current application occasions.
The invention provides a low-voltage large-current wireless charging system with a quasi-Z source inverter circuit on a primary side and a current-doubling synchronous rectification circuit on a secondary side, which can greatly adjust the equivalent load resistance of the wireless charging system, realize the maximum efficiency tracking control of the system, improve the input voltage of a system inverter and reduce the current of a power loop, thereby reducing the conduction loss of system elements.
Example 2
An embodiment of the present invention provides a cooperative control method for a low-voltage large-current wireless charging system, where as shown in fig. 6, the cooperative control method is applied to the low-voltage large-current wireless charging system in embodiment 1, and the cooperative control method includes:
And 2, acquiring the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit.
And 3, if the voltage of the current load battery pack is smaller than the cut-off voltage, respectively calculating the current resistance of the load battery pack and the current mutual inductance of the primary and secondary side coils according to the initial through duty ratio, the voltage and the current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit.
Wherein, the current mutual inductance M of the primary coil and the secondary coil is expressed as:
and 4, calculating the current optimal duty ratio of the current-doubling synchronous rectification circuit according to the current resistance of the load battery pack and the current mutual inductance of the primary side coil and the secondary side coil, and controlling the synchronous rectification duty ratio of the current-doubling synchronous rectification circuit to be equal to the current optimal duty ratio so as to enable the equivalent load resistance of the current-doubling synchronous rectification circuit to be equal to the current system optimal load.
Illustratively, the calculation process of the current optimal duty ratio of the double-current synchronous rectification circuit is as follows:
according to the current mutual inductance of the primary and secondary side coils, using a formula
Calculating the optimal load R of the current systemopt(ii) a Then according to the optimal load R of the current systemoptUsing the formula
Calculating the current optimal duty ratio Ds-opt(ii) a Where ω is the angular frequency of resonance of the system, Rp、RsAnd RLfAre respectively primary side coils LpSecondary winding LsAnd primary side compensation inductance LfThe internal resistance of (d); roIs the equivalent resistance of the load cell stack.
And 6, calculating output power according to the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit.
Wherein the output power PoExpressed as:
and 7, performing PI control according to the output power, the voltage and the current of the current load battery pack and the current mutual inductance of the primary and secondary side coils, and adjusting the direct duty ratio to charge the load battery pack at constant power.
And 8, if the voltage of the current load battery pack is greater than or equal to the cut-off voltage, finishing the whole charging process.
In the control process, the control circuit of the original secondary side works independently.
Based on the above process DpAnd DsThe invention completes the maximum efficiency tracking control and the constant power charging through the cooperative work of the quasi-Z source inverter circuit and the current doubling synchronous rectification circuit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A low-voltage high-current wireless charging system, comprising: the device comprises a quasi-Z source inverter circuit, a resonance compensation circuit, a primary coil, a secondary coil, a current-doubling synchronous rectification circuit, a load battery pack, a first control module, a second control module, a first wireless communication circuit and a second wireless communication circuit;
the input end of the quasi-Z source inverter circuit inputs direct current of a power supply end, the output end of the quasi-Z source inverter circuit is connected with the input end of a primary side circuit of the resonance compensation circuit, and a primary side coil is connected with the output end of the primary side circuit of the resonance compensation circuit; the input end of a secondary side circuit of the resonance compensation circuit is connected with the secondary side coil, the output end of the secondary side circuit of the resonance compensation circuit is connected with the input end of the current-multiplying synchronous rectification circuit, and the output end of the current-multiplying synchronous rectification circuit is connected with the load battery pack;
the quasi-Z source inverter circuit is used for converting direct current into high-frequency alternating current and transmitting the high-frequency alternating current to a primary circuit of the resonance compensation circuit; the resonance compensation circuit is used for coupling the high-frequency alternating current of the primary circuit to the secondary circuit through the primary coil and the secondary coil in sequence, and transmitting the high-frequency alternating current to the current-doubling synchronous rectification circuit after compensation; the current-doubling synchronous rectification circuit is used for converting the compensated high-frequency alternating current into direct current at a load end and then charging a load battery pack;
the first control module is respectively connected with the quasi Z source inverter circuit and the first wireless communication circuit; the second control module is respectively connected with the current-multiplying synchronous rectification circuit, the load battery pack and the second wireless communication circuit; the first wireless communication circuit is wirelessly connected with the second wireless communication circuit;
the second control module is used for acquiring the voltage and the current of the load battery pack and transmitting the voltage and the current to the first control module through the second wireless communication circuit and the first wireless communication circuit in sequence; the first control module is used for acquiring direct current voltage input by the input end of the quasi-Z source inverter circuit and adjusting the direct duty ratio of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack so as to charge the load battery pack at constant power;
the first control module is also used for transmitting the direct-current voltage and the direct-connection duty ratio to the second control module through the first wireless communication circuit and the second wireless communication circuit in sequence; the second control module is also used for adjusting the synchronous rectification duty ratio according to the voltage and the current of the load battery pack, the direct current voltage and the direct current duty ratio, so that the equivalent load resistance of the current-doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is ensured to work at the maximum efficiency point all the time.
2. The low-voltage high-current wireless charging system according to claim 1, wherein the quasi-Z-source inverter circuit comprises: diode DzInductor Lz1An inductor Lz2Capacitor Cz1Capacitor Cz2And a full bridge inverter circuit;
inductor Lz1Is connected with the positive electrode of the power supply terminal, and an inductor Lz1Respectively connected with a diode DzAnode and capacitor Cz1Is connected with one end of the connecting rod; diode DzRespectively with a capacitor Cz2One terminal of (A) and an inductance Lz2Is connected with one end of the connecting rod; capacitor Cz2The other end of the first inverter is respectively connected with the negative electrode of the power supply end and the first input end of the full-bridge inverter circuit; inductor Lz2The other end of each of the first and second capacitors is connected to a capacitor Cz1The other end of the second inverter is connected with a second input end of the full-bridge inverter circuit; two output ends of the full-bridge inverter circuit are respectively connected with two ends of a primary side circuit of the resonance compensation circuit; the control end of the full-bridge inverter circuit is connected with the first control module.
3. The low-voltage high-current wireless charging system according to claim 2, wherein the current-doubling synchronous rectifying circuit comprises: metal oxide semiconductor field effect transistor Sr1A metal oxide semiconductor field effect transistor Sr2Metal oxide semiconductor field effect transistor Sr3Metal oxide semiconductor field effect transistor Sr4An inductor Lr1And an inductance Lr2；
Metal oxide semiconductor field effect transistor Sr1The drain of the second transistor is connected with one end of the secondary circuit of the resonance compensation circuit, and the metal oxide semiconductor field effect transistor Sr1Respectively with the source of the MOSFET Sr3Drain electrode of (1) and inductor Lr1Is connected with one end of the connecting rod; metal oxide semiconductor field effect transistor Sr3Source and metal-oxide-semiconductor field effect transistor Sr4Is connected with the source electrode of the transistor; inductor Lr1Another end of (2) and an inductor Lr2Is connected with one end of the connecting rod;
inductor Lr2The other end of the first and second electrodes are respectively connected with the metal oxide semiconductor field effect transistor Sr4Drain electrode of and metal oxide semiconductor field effect transistor Sr2Is connected with the source electrode of the transistor; metal oxide semiconductor field effect transistor Sr2The drain electrode of the resonant compensation circuit is connected with the other end of the secondary side circuit of the resonant compensation circuit;
metal oxide semiconductor field effect transistor Sr1Gate of (1), metal oxide semiconductor field effect transistor Sr2Gate of (1), metal oxide semiconductor field effect transistor (S)r3Gate of (1), metal oxide semiconductor field effect transistor (S)r4The grid electrodes of the grid electrodes are all connected with the second control module.
4. A low-voltage high-current wireless charging system according to claim 3, wherein the resonance compensation circuit is configured to generate resonance compensation currentThe way includes: primary side compensation inductance LfPrimary side compensation capacitor CfPrimary side compensation capacitor CpAnd secondary side compensation capacitor Cs；
Primary side compensation inductance LfIs connected with the first output end of the full-bridge inverter circuit, and the primary side compensation inductor LfAnd the other end of the primary side compensation capacitor CfPrimary side compensation capacitor CpIs connected with one end of the connecting rod; one end of the primary coil and the primary compensation capacitor CfIs connected with the other end of the primary coil, and the other end of the primary coil is connected with the primary compensation capacitor CpThe other end of the first and second connecting rods is connected;
one end of the secondary coil is respectively connected with a secondary compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr1Is connected with the drain electrode of the transistor; the other end of the secondary coil is respectively connected with a secondary compensation capacitor CsAnd a metal oxide semiconductor field effect transistor Sr2Is connected to the drain of (1).
5. The low-voltage high-current wireless charging system according to claim 1, wherein the first control module comprises: the circuit comprises a first sampling circuit, a first control circuit and a first driving circuit;
the input end of the first sampling circuit is connected with the input end of the quasi-Z source inverter circuit, and the output end of the first sampling circuit is connected with the first input end of the first control circuit; the first sampling circuit is used for collecting the direct current voltage input by the input end of the quasi-Z source inverter circuit and transmitting the direct current voltage to the first control circuit;
the second input end and the first output end of the first control circuit are connected with the first wireless communication circuit, the second output end of the first control circuit is connected with the control end of the first driving circuit, and the driving end of the first driving circuit is connected with the control end of the quasi-Z source inverter circuit; the first control circuit is used for obtaining a through duty ratio regulating value of the quasi-Z source inverter circuit according to the direct current voltage, the voltage and the current of the load battery pack, and regulating the through duty ratio of the quasi-Z source inverter circuit to the through duty ratio regulating value through the first driving circuit.
6. The low-voltage high-current wireless charging system according to claim 1, wherein the second control module comprises: the second sampling circuit, the second control circuit and the second drive circuit;
the input end of the second sampling circuit is connected with the load battery pack, and the output end of the second sampling circuit is connected with the first input end of the second control circuit; the second sampling circuit is used for collecting the voltage and the current of the load battery pack and transmitting the voltage and the current of the load battery pack to the second control circuit;
a second input end and a first output end of the second control circuit are both connected with the second wireless communication circuit, a second output end of the second control circuit is connected with a control end of the second driving circuit, and a driving end of the second driving circuit is connected with a control end of the current-multiplying synchronous rectification circuit; the second control circuit is used for obtaining the voltage and the current of the load battery pack and adjusting the synchronous rectification duty ratio according to the voltage and the current of the load battery pack, the direct current voltage and the direct current duty ratio, so that the equivalent load resistance of the current-doubling synchronous rectification circuit tracks the optimal load of the system in real time, and the system is guaranteed to work at the maximum efficiency point all the time.
7. The low-voltage high-current wireless charging system according to claim 6, further comprising: a third sampling circuit and a comparison circuit;
the input end of the third sampling circuit is connected with the input end of the current-doubling synchronous rectification circuit, the output end of the third sampling circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is connected with the third input end of the second control circuit;
the third sampling circuit is used for collecting the input voltage of the current-multiplying synchronous rectification circuit; the comparison circuit is used for generating a control time sequence signal according to the input voltage of the current-doubling synchronous rectification circuit and transmitting the control time sequence signal to the second control circuit.
8. The low-voltage high-current wireless charging system according to claim 1, wherein the quasi-Z source inverter circuit comprises two operation modes of direct connection and non-direct connection;
the current-doubling synchronous rectification circuit comprises a positive half-cycle synchronous rectification mode and a follow current working mode, and a negative half-cycle synchronous rectification mode and a follow current working mode.
9. A cooperative control method for a low-voltage high-current wireless charging system, wherein the cooperative control method employs the low-voltage high-current wireless charging system of any one of claims 1 to 8, and the cooperative control method comprises:
presetting an initial through duty ratio and an initial synchronous rectification duty ratio which enable the low-voltage large-current wireless charging system to be in a charging state;
acquiring the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit;
if the voltage of the current load battery pack is smaller than the cut-off voltage, respectively calculating the current resistance of the load battery pack and the current mutual inductance of the primary and secondary side coils according to the initial through duty ratio, the voltage and the current of the current load battery pack and the direct current voltage at the input end of the current quasi Z source inverter circuit;
calculating the current optimal duty ratio of the current doubling synchronous rectification circuit according to the current resistance of the load battery pack and the current mutual inductance of the primary side coil and the secondary side coil, and controlling the synchronous rectification duty ratio of the current doubling synchronous rectification circuit to be equal to the current optimal duty ratio so as to enable the equivalent load resistance of the current doubling synchronous rectification circuit to be equal to the current system optimal load;
calculating output power according to the voltage and current of the current load battery pack and the direct current voltage at the input end of the current quasi-Z source inverter circuit;
performing PI control according to the output power, the voltage and current of the current load battery pack and the current mutual inductance of the primary and secondary side coils, and adjusting a direct duty ratio to perform constant-power charging on the load battery pack;
and if the voltage of the current load battery pack is greater than or equal to the cut-off voltage, the whole charging process is finished.
10. The cooperative control method according to claim 9, wherein calculating a current optimal duty ratio of the current-doubling synchronous rectification circuit according to a current resistance of the load battery pack and a current mutual inductance of the primary and secondary side coils specifically comprises:
according to the current mutual inductance of the primary and secondary side coils, using a formula
Calculating the optimal load R of the current systemopt(ii) a Where ω is the angular frequency of resonance of the system, Rp、RsAnd RLfAre respectively primary side coil LpSecondary winding LsAnd primary side compensation inductance LfM is the current mutual inductance of the primary and secondary side coils;
according to the optimal load R of the current systemoptUsing the formula
Calculating the current optimal duty ratio Ds-opt(ii) a Wherein R isoIs the equivalent resistance of the load cell stack.
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| WO2023207049A1 (en) * | 2022-04-28 | 2023-11-02 | 中国科学院电工研究所 | Low-voltage large-current wireless charging system and cooperative control method thereof |
| CN117477803A (en) * | 2023-12-28 | 2024-01-30 | 中国人民解放军国防科技大学 | Inversion resonance constant-power wireless charging system and control method |
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| CN109391044A (en) * | 2018-11-14 | 2019-02-26 | 中国矿业大学 | A kind of efficient pressure stabilizing complex control system of inductive electric energy transmission system and method |
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| CN108183621B (en) * | 2018-03-13 | 2024-02-20 | 刘钰山 | Power density improving method of single-phase quasi-Z source inverter based on SiC |
| JP7118293B2 (en) * | 2019-12-09 | 2022-08-15 | 三菱電機株式会社 | power converter |
| CN112072942A (en) * | 2020-09-28 | 2020-12-11 | 青岛理工大学 | Improved switch coupling inductor quasi Z source inverter |
| CN114784996A (en) * | 2022-04-28 | 2022-07-22 | 中国科学院电工研究所 | Low-voltage high-current wireless charging system and cooperative control method thereof |
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| CN109391044A (en) * | 2018-11-14 | 2019-02-26 | 中国矿业大学 | A kind of efficient pressure stabilizing complex control system of inductive electric energy transmission system and method |
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Cited By (3)
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| WO2023207049A1 (en) * | 2022-04-28 | 2023-11-02 | 中国科学院电工研究所 | Low-voltage large-current wireless charging system and cooperative control method thereof |
| CN117477803A (en) * | 2023-12-28 | 2024-01-30 | 中国人民解放军国防科技大学 | Inversion resonance constant-power wireless charging system and control method |
| CN117477803B (en) * | 2023-12-28 | 2024-03-15 | 中国人民解放军国防科技大学 | Inversion resonance constant-power wireless charging system and control method |
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