CN116073529A - Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof - Google Patents

Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof Download PDF

Info

Publication number
CN116073529A
CN116073529A CN202310015963.8A CN202310015963A CN116073529A CN 116073529 A CN116073529 A CN 116073529A CN 202310015963 A CN202310015963 A CN 202310015963A CN 116073529 A CN116073529 A CN 116073529A
Authority
CN
China
Prior art keywords
resonance
frequency
receiving end
resonant
transmitting end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310015963.8A
Other languages
Chinese (zh)
Inventor
续文政
祁静静
吴学智
荆龙
郑明玥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Jiaotong University
Original Assignee
Beijing Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Jiaotong University filed Critical Beijing Jiaotong University
Priority to CN202310015963.8A priority Critical patent/CN116073529A/en
Publication of CN116073529A publication Critical patent/CN116073529A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to an improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof, and belongs to the field of wireless charging. The invention is characterized in that a diode is connected in series in front of a DC-AC inversion unit and a coil L is arranged at a receiving end 2 And a group of anti-serial switching tubes are connected in parallel, so that the transmitting end and the receiving end in a zero resonance state can stop resonance at the same time, and an improved S-S wireless charging system is obtained. The system performs tuning control under the condition of resonance offset, and then realizes voltage regulation by changing the duty ratio corresponding to the high and low levels under the condition of keeping the resonance state, thereby realizing synchronous regulation of system resonance and output voltage. Further, the voltage regulation is realized by changing the duty ratio corresponding to the high and low levels and by fixed-width frequency modulation control; the fixed width frequency modulation is controlled to be in fixed resonanceOn the premise of vibration frequency, the total period duration of control is changed by inserting a zero resonance state, so that the equivalent frequency is changed.

Description

Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof
Technical Field
The disclosure relates to the field of wireless charging, in particular to an improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof.
Background
The wireless charging system is a power supply system for transmitting energy by electromagnetic induction of a transmitting end coil and a receiving end coil. The electric power generation device can realize mechanical isolation between power generation and electric equipment, reduce the use of sockets and cables, and has wide application prospects in the fields of electric automobile charging and the like. Because of the loose coupling characteristic of the transmitting end coil and the receiving end coil, in order to improve the transmission performance and the quality factor of the system, a resonance compensation network is added into the wireless charging system to enable the system to be in a resonance state. In the resonance state, the voltage obtained by the load is higher, the reactive power of the system is smaller, and the output active power and the energy transmission efficiency of the system are larger.
In the actual work of the wireless charging system, along with the change of actual application scenes, the change of parameters such as the relative position of the coupling coil, the equivalent impedance of the load and the like can cause the deviation of resonance parameters such as self inductance, mutual inductance, coupling coefficient and the like of the coil, the resonance state of the system is destroyed, the resonance frequency of a transmitting end is changed, the reactive power of a circuit of the transmitting end is increased, the active power transmitted by the system is reduced, and the risks of overvoltage and overcurrent are faced. The key point of the current wireless charging system design is to improve the maximum tolerance of the system when the coil position is deviated, so that the system can realize relatively stable wireless energy transmission in a certain wider coupling coefficient change interval, and the charging voltage or current is ensured not to generate larger fluctuation. This research direction is of greater importance in facilitating wireless charging energy applications in a greater number of applications. This is achieved only if the wireless charging system is always operating near the resonant frequency without a significant deviation from the resonant point. Therefore, in order to make the transmitting end always operate in the resonance state, it is necessary to make the operating frequency of the transmitting end inverter circuit always track the resonance frequency of the transmitting end.
The frequency adjustment ("frequency modulation") is one of the basic methods of tuning, and the operating frequency of the transmitting-end inverter circuit is directly adjusted to be consistent with the resonant frequency of the transmitting end of the system. As an efficiency optimization method, the system has larger output power and transmission efficiency by performing real-time control optimization on the working frequency of the system. However, most existing frequency tracking algorithms employ a hardware comparator to measure the voltage and current phase difference of the inverter and then control the operating frequency of the inverter to track the resonant frequency. Due to high-frequency noise and the like, the measurement error of the phase difference between the voltage and the current is large, and the frequency tracking effect is poor. In order to avoid the problem of voltage and current measurement errors, zhejiang university research team proposes a frequency tracking control method (frequency tracking technology and control method of wireless power transmission system, motor and control report, 2020, 24 (09): 22-29) based on maximum received voltage, real-time detection of the load voltage of the receiving end, automatic adjustment of the frequency of the transmitting source [ J ] to ensure that the system is always in the maximum power transmission state, and the receiving power and transmission efficiency are respectively improved by 19.25% and 10.56%; chongqing university Zhang Yufan (optimization analysis and frequency tracking control [ D ] of a non-contact inductively coupled power transmission system, chongqing university, 2011) aims at the problem that the transmission efficiency of the system is sensitive to the change of system parameters, and a phase-locked loop frequency tracking control method is adopted, so that the energy efficiency product is used as an optimization index, and a good efficiency optimization effect is achieved. Compared with the frequency tracking tuning method of the transmitting end of the wireless charging system based on the minimum voltage value, which is proposed in patent 1 (CN 104135085A, a frequency tracking tuning method of the transmitting end of the wireless power transmission equipment), the frequency tracking tuning method of the transmitting end of the wireless charging system can only tune, and the voltage regulation of the system can not be realized under the condition of not externally connecting a direct current-direct current converter. Compared with patent 2 (CN 209448509U, an automatic voltage-regulating resonant wireless power transmission device using a Buck converter) considers that the load of most wireless charging systems needs to work in a constant voltage source mode, and in order to reduce power loss and increase system efficiency, an additional Buck converter is added at a receiving end to carry out switching voltage stabilization, so that the control of output voltage and power is realized.
In summary, although the existing tuning methods of the wireless charging system can provide a reference idea, the tuning methods all require an additional dc-dc converter for output control. At present, a topological structure and a corresponding control strategy for single-order wireless charging which simultaneously realize tuning and output control when resonance parameters are changed are not available. Therefore, in practical application, the system is required to be kept in a resonance state and the output is adjustable through a certain control method. Since system analysis and computation often equivalent a load to a resistive load, its direct physical quantity of output control is the load voltage, the "output control" herein is also more intuitively referred to as "voltage regulation".
Disclosure of Invention
Aiming at the topology structure and the corresponding control strategy of a single-order wireless charging system which do not realize tuning and voltage regulation at the same time at present, the invention aims to provide an improved S-S type wireless charging system with single-order frequency modulation and voltage regulation, which can realize tuning and output control of the wireless charging system at the same time without adding an additional direct current-direct current converter circuit, and effectively improves the power density of the system under the condition of realizing the tuning and output control functions at the same time.
In order to solve the technical problems, the technical scheme of the invention is as follows.
In a first aspect, the invention provides an improved S-S wireless charging system with single-order frequency modulation and voltage regulation, wherein the system is a magnetic coupling resonance wireless charging system and comprises a transmitting end and a receiving end; at the transmitting end, the input DC voltage is converted into high-frequency AC power by the DC-AC inversion unit, and the high-frequency AC power passes through the resonant capacitor C at the transmitting end 1 And a transmitting coil L 1 The transmitting end resonance unit is used for providing electric energy for the receiving end; at the receiving end, through the resonant capacitor C 2 And a receiving coil L 2 The receiving end resonance unit receives high-frequency alternating current as electric energy and converts the high-frequency alternating current into direct current capable of supplying power to a load through the alternating current-direct current conversion unit; by series connection of a diode in front of the DC-AC inverter unit and a coil L at the receiving end 2 The back parallel connection of a group of anti-serial switching tubes enables the transmitting end and the receiving end in the zero resonance state to stop simultaneouslyResonance, thereby obtaining an improved S-S wireless charging system; the system performs tuning control under the condition of resonance offset, and then realizes voltage regulation by changing the duty ratio corresponding to the high and low levels under the condition of keeping the resonance state, thereby realizing synchronous regulation of system resonance and output voltage.
In the above technical scheme, the voltage regulation is realized by changing the duty ratio corresponding to the high and low levels and by the width-fixing frequency modulation control;
the fixed-width frequency modulation control is to change the total period duration of the control by inserting a zero resonance state on the premise of fixed resonance frequency, so that the equivalent frequency is changed.
In the above technical solution, the tuning control is performed under the condition of resonance shift, and includes the following steps:
when the coupling parameters change, judging whether the current frequency meets the system resonance or not;
if the system is not resonant, changing the switching frequency of the system to the resonant frequency when the resonant frequency of the transmitting end and the receiving end is the same, so that the system returns to the resonant state again;
when the resonant frequencies of the transmitting end and the receiving end are different, the transmitting end adopts frequency conversion to realize tuning, and the receiving end adopts a tunable vibrating capacitor to realize compensation of resonance offset, so that the system returns to a resonant state again.
In the above technical solution, whether the current frequency meets the system resonance is determined specifically as follows:
checking the output voltage U of a DC-AC inverter unit in-ac And the current I of the transmitting end 1 Whether or not in phase, and receiving-side resonance capacitor C 2 Voltage U on c2 And the current I of the transmitting end 1 Whether in phase.
In the technical proposal, after the fixed-width frequency modulation control, the output voltage U 'of the system' out The process is as follows:
the resonance frequency of the system is unchanged:
Figure BDA0004040428530000051
resonant frequency of systemThe rate is from omega s Becomes omega r Is that:
Figure BDA0004040428530000052
wherein: u (U) out For the system output voltage before the fixed-width frequency modulation control, T is the duration of each period before the zero resonance state is added, and DeltaT is the insertion duration of the single zero resonance state.
In the above technical solution, the dc-ac inverter unit includes a filter capacitor C d Load resistor R L A rectifier;
the rectifier is composed of D 1 、D 2 、D 3 、D 4 Four diodes or MOSFETs or IGBT switching tubes;
wherein D is 1 、D 2 D after series connection and after series connection 3 、D 4 In parallel with and then respectively with filter capacitor C d Load resistor R L Parallel connection;
positive pole and D of receiving end resonance unit 1 、D 2 Is connected with the connection point of the receiving end resonance unit, and the negative electrode of the receiving end resonance unit is connected with D 3 、D 4 Is connected to the connection point of (c).
In a second aspect, the present invention provides a method for controlling an improved S-S wireless charging system with single-order frequency modulation and voltage regulation, the method comprising the steps of:
a diode is connected in series in front of a DC-AC inversion unit of an S-S wireless charging system, and a coil L is arranged at a receiving end 2 The back parallel connection of a group of anti-serial switching tubes enables the transmitting end and the receiving end in the zero resonance state to stop resonance at the same time, so that an improved S-S wireless charging system is obtained;
and under the condition of system resonance offset, tuning control is carried out, and then voltage regulation is realized by changing the duty ratio corresponding to the high level and the low level under the state of maintaining resonance, so that synchronous regulation of system resonance and output voltage is realized.
In the above technical scheme, the voltage regulation is realized by changing the duty ratio corresponding to the high and low levels and by the width-fixing frequency modulation control;
the fixed-width frequency modulation control is to change the total period duration of the control by inserting a zero resonance state on the premise of fixed resonance frequency, so that the equivalent frequency is changed.
In the above technical solution, the tuning control is performed under the condition of resonance shift, and includes the following steps:
when the coupling parameters change, judging whether the current frequency meets the system resonance or not;
if the system is not resonant, changing the switching frequency of the system to the resonant frequency when the resonant frequency of the transmitting end and the receiving end is the same, so that the system returns to the resonant state again;
when the resonant frequencies of the transmitting end and the receiving end are different, the transmitting end adopts frequency conversion to realize tuning, and the receiving end adopts a tunable vibrating capacitor to realize compensation of resonance offset, so that the system returns to a resonant state again.
In the above technical solution, whether the current frequency meets the system resonance is determined specifically as follows:
checking the output voltage U of a DC-AC inverter unit in-ac And the current I of the transmitting end 1 Whether or not in phase, and receiving-side resonance capacitor C 2 Voltage U on c2 Emitter current I 1 Whether in phase.
The improved S-S type wireless charging system and the implementation method for single-order frequency modulation and voltage regulation can realize tuning and output control of the system at the same time without adding an additional direct current-direct current converter circuit, and effectively improve the power density of the system under the condition of realizing the tuning and output control functions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a topology of an improved S-S wireless charging system in one embodiment;
FIG. 2 is a schematic diagram showing the comparison of the driving pulse of the transmitting end and the resonance waveforms of the transmitting end in one embodiment;
FIG. 3 is a schematic diagram of an anti-series switching tube driving pulse and a voltage-current waveform detected by a receiving end in one embodiment;
FIG. 4 is a schematic diagram of an anti-series switching tube driving pulse and a receiving end resonance waveform in one embodiment;
fig. 5 is a schematic flow chart of a fixed-width fm control strategy in an embodiment.
Detailed Description
Tuning of the wireless charging system has an important role in its improvement of the active power and efficiency of the transmission. The conventional tuning method of the wireless charging system is only used for maintaining the resonance state of the system, and an additional direct current-direct current converter (i.e., a DC/DC converter) is added at the transmitting end or the receiving end of the system to control the output voltage and the power (hereinafter referred to as "output control"). The invention aims to provide an improved S-S type wireless charging system with single-order frequency modulation and voltage regulation, which can realize tuning and output control of the wireless charging system without adding an additional direct current-direct current converter circuit, and effectively improve the power density of the system under the condition of realizing the tuning and output control functions.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, a schematic diagram of a topology structure of an improved S-S wireless charging system is shown. Improved S-S wireless charging system is a magnetic coupling resonant wireless charging systemThe system. Input DC voltage U in_dc Through a full-bridge inverter circuit (T) composed of four MOSFETs 1 ～T 4 ) Becomes high-frequency alternating current and then passes through a resonant capacitor C at the transmitting end 1 And a transmitting coil L 1 The transmitting end resonance unit is formed to provide electric energy for the receiving end. Resonance capacitor C of receiving end 2 And a receiving coil L 2 And forming a receiving end resonance unit. The electric energy received by the receiving end is high-frequency alternating current, and then the electric energy is passed through a full-bridge rectifying circuit (D 1 、D 2 、D 3 、D 4 ) And a series of subsequent processes to convert to direct current that can power the load. R is R 1 For the internal resistance of the coil at the transmitting end, R 2 For receiving end coil internal resistance, C d R is filter capacitance L And M is the mutual inductance of the inductance coil. In order to ensure that the transmitting end and the receiving end can stop resonating at the same time under the zero resonance state of the system, a diode D is connected in series in front of an inverter of an S-S wireless charging topology in The positive pole of the power supply is connected with the positive pole of the input power supply, and the negative pole of the power supply is connected with the switch tube T 1 Is connected with the drain electrode of the receiving end coil and is connected with a group of anti-series switching tubes (T) 5 ，T 6 ) To ensure that the original receiving end can stop resonance at the same time in the zero resonance state.
In the topology structure, the receiving end is connected in series with the resonant capacitor C 2 The topology of (a) can be varied, such as switched capacitor, phase-controlled inductor, etc., which can each realize a resonant capacitor C 2 The resonance offset compensation function is provided.
In the above topology, the dc-ac inverter unit includes a filter capacitor C d Load resistor R L ，D 1 、D 2 、D 3 、D 4 Four diodes; wherein D is 1 、D 2 D after series connection and after series connection 3 、D 4 In parallel with and then respectively with filter capacitor C d Load resistor R L Parallel connection; positive pole and D of receiving end resonance unit 1 The anode of the receiving end resonance unit is connected with the anode of the D 4 Is connected to the negative electrode of the battery. D (D) 1 、D 2 、D 3 、D 4 The four diodes can also be replaced by MOSFET or IGBT switching tubes, so that the rectifier bridge is changed into synchronous rectification.
The system performs tuning control under the condition of resonance offset, and then realizes voltage regulation by changing the duty ratio corresponding to the high and low levels under the condition of keeping the resonance state, thereby realizing synchronous regulation of system resonance and output voltage.
In the present embodiment, the voltage is adjusted by changing the duty ratio corresponding to the high and low levels by the fixed-width frequency modulation control. FIG. 2 is a schematic diagram of key waveforms of a fixed-width frequency modulation strategy. The "width" of the "fixed width frequency modulation" refers to the pulse width of the conduction of the switching tube of the transmitting-end inverter circuit, and the fixed width means that the resonance frequency of the system resonance element is unchanged, and is denoted as t in fig. 2 0 -t 1 And t 2 -t 3 The lengths of the two are the same, and the two are the time when the system is in the resonance state, and the system is in the resonance state at the moment. The fixed-width frequency modulation control is realized by inserting a zero resonance state (i.e. t 1 -t 2 、t 3 -t 4 、t 5 -t 6 ) The total cycle duration of the control is changed. In fig. 2, the moment when the current resonance of the transmitting end is 0 occurs twice in one switching cycle, at t 1 At moment, the current of the transmitting end is resonated for the first time to be 0, and a zero resonance state t is added at the moment 1 -t 2 The method comprises the steps of carrying out a first treatment on the surface of the At t 3 At moment, the current of the transmitting end resonates for the second time to be 0, and a zero resonance state t is added at the moment 3 -t 4 Thereby changing the total duration of control and further realizing the regulation of output voltage.
Because the fixed-width frequency modulation control inserts a zero resonance state, the output voltage of the inverter is theoretically 0, but because of charges existing on the resonance capacitor of the transmitting end, the voltage of the resonance capacitor can generate inverse vibration, and the waveform of the output voltage of the inverter bridge is shown as figure 2, wherein T is 1 、T 2 Is the complementary pulse of the inverter bridge, U in-ac To invert the bridge output voltage, I 1 Is the emitter current.
The transmit side resonance waveform of the system is shown in fig. 3. The resonance waveform of the system receiving end is shown in fig. 4, wherein G isReceiving end anti-series switching tube (T) 5 And T 6 ) Drive pulse waveform of U c2 For receiving end resonant capacitor C 2 Voltage on I 1 Is the emitter current.
Fig. 5 is a specific embodiment of performing tuning control under the condition of resonance shift, and then implementing voltage regulation by changing the duty ratio corresponding to the high and low levels under the condition of maintaining the resonance state, so as to implement synchronous regulation of system resonance and output voltage.
Specifically, first, it is observed whether the coupling parameter changes: when the system parameters deviate, the output voltage U of the inverter bridge is checked in-ac And the current I of the transmitting end 1 Whether the system is in phase or not is judged, and whether the system transmitting end can resonate or not under the current switching frequency is judged. If the transmitting end does not resonate, the switching frequency of the system is changed to the resonant frequency, so that the transmitting end of the system returns to the resonant state again. Further checking the receiving-end resonance capacitance C 2 Voltage U on c2 And the current I of the transmitting end 1 Whether the system receiving end can resonate or not is judged. If the receiving end does not meet the resonance condition, the receiving end adopts a tunable resonance capacitor to realize the compensation of resonance offset, so that the system returns to the resonance state again, and the inverter soft switch is realized under the condition of resonance offset. Under different reference frequencies, the system is subjected to fixed-width frequency modulation control, the equivalent frequency is changed through the addition of a zero resonance state, the duty ratio corresponding to the high level and the low level is changed, and the synchronous adjustment of the system resonance and the output voltage can be realized without an additional direct current-direct current converter.
In the initial state, the resonance parameters are:
Figure BDA0004040428530000101
when the coupling parameter changes, the coil parameter becomes L' 1 、L′ 2 The resonance frequency becomes omega r Namely, under the control of fixed-width frequency modulation, the equivalent frequency of the high and low level is omega r 。
According to the resonance formula:
Figure BDA0004040428530000111
the resonant frequency, namely the tunable resonant capacitance parameter of the receiving end is determined as follows:
Figure BDA0004040428530000112
under the condition that the resonance frequency of the system is unchanged, after the fixed-width frequency modulation control is carried out, the output voltage of the system is changed into:
Figure BDA0004040428530000113
wherein: u (U) out For the system output voltage before the fixed-width frequency modulation control, T is the duration of each period before the zero resonance state is added, and DeltaT is the insertion duration of the single zero resonance state.
The resonant frequency of the system is represented by omega s Becomes omega r In the case of (2), after the fixed-width frequency modulation control is performed, the output voltage of the system is changed to:
Figure BDA0004040428530000114
in summary, the simultaneous frequency modulation (tuning) and voltage regulation (output control) functions can be implemented according to the above formula and fig. 5.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.

Claims (10)

1. An improved S-S type wireless charging system with single-order frequency modulation and voltage regulation is a magnetic coupling resonance type wireless charging system and comprises a transmitting end and a receiving end; at the transmitting end, the input DC voltage is converted into high-frequency AC power by the DC-AC inversion unit, and the high-frequency AC power passes through the resonant capacitor C at the transmitting end 1 And a transmitting coil L 1 The transmitting end resonance unit is used for providing electric energy for the receiving end; at the receiving end, through the resonant capacitor C 2 And a receiving coil L 2 The receiving end resonance unit is used for receiving high-frequency alternating current as electric energy and converting the high-frequency alternating current into direct current capable of supplying power to a load through the alternating current-direct current conversion unit; the method is characterized in that:
by series connection of a diode in front of the DC-AC inverter unit and a coil L at the receiving end 2 The back parallel connection of a group of anti-serial switching tubes enables the transmitting end and the receiving end in the zero resonance state to stop resonance at the same time, so that an improved S-S wireless charging system is obtained;
the system performs tuning control under the condition of resonance offset, and then realizes voltage regulation by changing the duty ratio corresponding to the high and low levels under the condition of keeping the resonance state, thereby realizing synchronous regulation of system resonance and output voltage.
2. The system according to claim 1, wherein the voltage regulation is realized by changing the duty ratio corresponding to the high and low levels, and the voltage regulation is realized by fixed-width frequency modulation control;
the fixed-width frequency modulation control is to change the total period duration of the control by inserting a zero resonance state on the premise of fixed resonance frequency, so that the equivalent frequency is changed.
3. The system of claim 1, wherein the tuning control is performed with a resonance shift, comprising the steps of:
when the coupling parameters change, judging whether the current frequency meets the system resonance or not;
if the system is not resonant, changing the switching frequency of the system to the resonant frequency when the resonant frequency of the transmitting end and the receiving end is the same, so that the system returns to the resonant state again;
when the resonant frequencies of the transmitting end and the receiving end are different, the transmitting end adopts frequency conversion to realize tuning, and the receiving end adopts a tunable vibrating capacitor to realize compensation of resonance offset, so that the system returns to a resonant state again.
4. A system according to claim 3, characterized in that it is determined whether the current frequency satisfies the system resonance, in particular:
checking the output voltage U of the DC/AC inverter unit in-ac And the current I of the transmitting end 1 Whether or not in phase, and receiving-side resonance capacitor C 2 Voltage U on c2 Emitter current I 1 Whether in phase.
5. The system of claim 2, wherein the output voltage U 'of the system after the fixed width frequency modulation control' out The process is as follows:
the resonance frequency of the system is unchanged:
Figure FDA0004040428520000021
the resonant frequency of the system is represented by omega s Becomes omega r Is that:
Figure FDA0004040428520000022
wherein: u (U) out For the system output voltage before the fixed-width frequency modulation control, T is the duration of each period before the zero resonance state is added, and DeltaT is the insertion duration of the single zero resonance state.
6. The system according to claim 1, wherein:
the DC-AC inversion unit comprises a filter capacitor C d Load resistor R L A rectifier;
the rectifier is composed of D 1 、D 2 、D 3 、D 4 Four diodes orMOSFET or IGBT switching tubes;
wherein D is 1 、D 2 D after series connection and after series connection 3 、D 4 In parallel with and then respectively with filter capacitor C d Load resistor R L Parallel connection;
positive pole and D of receiving end resonance unit 1 、D 2 Is connected with the connection point of the receiving end resonance unit, and the negative electrode of the receiving end resonance unit is connected with D 3 、D 4 Is connected to the connection point of (c).
7. A regulation and control method of an improved S-S wireless charging system for single-order frequency modulation and voltage regulation is characterized by comprising the following steps:
a diode is connected in series in front of a DC-AC inversion unit of an S-S wireless charging system, and a coil L is arranged at a receiving end 2 The back parallel connection of a group of anti-serial switching tubes enables the transmitting end and the receiving end in the zero resonance state to stop resonance at the same time, so that an improved S-S wireless charging system is obtained;
and under the condition of system resonance offset, tuning control is carried out, and then voltage regulation is realized by changing the duty ratio corresponding to the high level and the low level under the state of maintaining resonance, so that synchronous regulation of system resonance and output voltage is realized.
8. The method of claim 7, wherein the voltage regulation is realized by changing the duty ratio corresponding to the high and low levels through fixed-width frequency modulation control;
the fixed-width frequency modulation control is to change the total period duration of the control by inserting a zero resonance state on the premise of fixed resonance frequency, so that the equivalent frequency is changed.
9. The method of claim 7, wherein the tuning control is performed with a resonance shift, comprising the steps of:
when the coupling parameters change, judging whether the current frequency meets the system resonance or not;
if the system is not resonant, changing the switching frequency of the system to the resonant frequency when the resonant frequency of the transmitting end and the receiving end is the same, so that the system returns to the resonant state again;
when the resonant frequencies of the transmitting end and the receiving end are different, the transmitting end adopts frequency conversion to realize tuning, and the receiving end adopts a tunable vibrating capacitor to realize compensation of resonance offset, so that the system returns to a resonant state again.
10. The method according to claim 9, wherein determining whether the current frequency satisfies a system resonance is performed by:
checking the output voltage U of a DC-AC inverter unit in-ac And the current I of the transmitting end 1 Whether or not in phase, and receiving-side resonance capacitor C 2 Voltage U on c2 And the current I of the transmitting end 1 Whether in phase.
CN202310015963.8A 2023-01-06 2023-01-06 Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof Pending CN116073529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310015963.8A CN116073529A (en) 2023-01-06 2023-01-06 Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310015963.8A CN116073529A (en) 2023-01-06 2023-01-06 Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof

Publications (1)

Publication Number Publication Date
CN116073529A true CN116073529A (en) 2023-05-05

Family

ID=86169344

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310015963.8A Pending CN116073529A (en) 2023-01-06 2023-01-06 Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof

Country Status (1)

Country Link
CN (1) CN116073529A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118539625A (en) * 2024-07-29 2024-08-23 中铁电气化局集团有限公司 Multi-machine coordination control method, system and equipment for high-power wireless energy transmission equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118539625A (en) * 2024-07-29 2024-08-23 中铁电气化局集团有限公司 Multi-machine coordination control method, system and equipment for high-power wireless energy transmission equipment
CN118539625B (en) * 2024-07-29 2024-10-08 中铁电气化局集团有限公司 Multi-machine coordination control method, system and equipment for high-power wireless energy transmission equipment

Similar Documents

Publication Publication Date Title
US20210226473A1 (en) Receive end and transmit end of wireless charging system, method, electrical terminal, and system
CN109302070A (en) Power converter circuit topological structure and its control method
CN109245536A (en) A kind of circuit topological structure suitable for the transmission of two-way near field electric energy
US11190042B2 (en) Wireless charging transmitting apparatus, transmitting method, and wireless charging system
CN208955902U (en) A kind of circuit topological structure suitable for the transmission of two-way near field electric energy
CN111799897A (en) Method for controlling power converter circuit
CN109831013A (en) A kind of constant current-constant pressure pair side automatic switch-over circuit and resonance type wireless electric energy transmission system
CN109256840A (en) A kind of the SS offset-type constant current wireless charging power supply and charging method of transmitting terminal Buck control
CN115033046B (en) Maximum efficiency tracking control method of MCR-WPT system
CN112260549B (en) Method for reducing loss of primary side inverter of resonant wireless power transmission system
CN116073529A (en) Improved S-S type wireless charging system with single-order frequency modulation and voltage regulation and control method thereof
WO2023029885A1 (en) Transmitting end, receiving end, dynamic wireless power supply system and electric vehicle
CN113991889A (en) Wireless power transmission power control method and system
CN115765484A (en) Frequency conversion asymmetric control method under full-bridge LLC light load
CN118399786A (en) Power supply circuit, power supply control method, composite power supply circuit and electronic equipment
Wei et al. A wireless power transfer system with hybrid control for constant current and voltage output
CN112421792B (en) Wireless charging system and control method for constant-current/constant-voltage charging optimization
CN112421734A (en) Single-stage high-order compensation constant-current constant-voltage wireless charging device and method
CN116317204A (en) Anti-offset detuning LCL-S type compensation wireless power transmission system based on reconstruction rectifier
CN210806860U (en) Wireless power transmission system with constant voltage output characteristic
CN111525706A (en) Frequency modulation type phase-locking synchronous rectification control circuit and frequency modulation type phase-locking method
Feng et al. Study of Double-Sided LCC Compensation Wireless Power Transfer Based on Zero Voltage Switching
Luo et al. A primary shunt inductor compensated inductive power transfer system with natural ZVS for battery charging application
CN115102302A (en) High-efficiency quasi-single-stage wireless charging device
CN218449869U (en) LLC resonant converter regulation and control device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination