CN116488357A - Phase shift control method and device for wireless power transmission system and wireless electrical equipment - Google Patents

Phase shift control method and device for wireless power transmission system and wireless electrical equipment Download PDF

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Publication number
CN116488357A
CN116488357A CN202210044721.7A CN202210044721A CN116488357A CN 116488357 A CN116488357 A CN 116488357A CN 202210044721 A CN202210044721 A CN 202210044721A CN 116488357 A CN116488357 A CN 116488357A
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CN
China
Prior art keywords
target
power transmission
transmission system
wireless power
wireless
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
CN202210044721.7A
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Chinese (zh)
Inventor
张健彬
徐锦清
李明
王慧锋
霍兆镜
岑长岸
朱佰盛
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.)
GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
Original Assignee
GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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Publication date
Application filed by GD Midea Air Conditioning Equipment Co Ltd, Foshan Shunde Midea Electric Science and Technology Co Ltd filed Critical GD Midea Air Conditioning Equipment Co Ltd
Priority to CN202210044721.7A priority Critical patent/CN116488357A/en
Publication of CN116488357A publication Critical patent/CN116488357A/en
Pending legal-status Critical Current

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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
    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or 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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current

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

Abstract

The invention discloses a phase shift control method, a device and wireless electrical equipment of a wireless power transmission system, wherein the wireless power transmission system comprises a wireless transmitting module for wirelessly transmitting electric energy and a wireless receiving module for wirelessly receiving the electric energy, the wireless transmitting module comprises a full-bridge inverter circuit, and the wireless receiving module is connected with a load, and the method comprises the following steps: acquiring a target input inductance curve under a target load resistance value, wherein the input inductance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductance value; determining a target input inductance value and a target working frequency corresponding to the target input inductance value based on a target input inductance curve, wherein the target input inductance value enables the wireless power transmission system to be inductive; and adjusting the working frequency of the wireless power transmission system to be the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching. The scheme effectively reduces the loss of the wireless power transmission system.

Description

Phase shift control method and device for wireless power transmission system and wireless electrical equipment
Technical Field
The invention belongs to the field of wireless power transmission, and particularly relates to a phase shift control method and device of a wireless power transmission system and wireless electrical equipment.
Background
A wireless power transmission system is generally divided into a transmitting side for transmitting power wirelessly to the outside and a receiving side for receiving power wirelessly transmitted by the transmitting side to power a powered device. In the related art, in order to enable a wireless power transmission system to output a stable voltage, it is generally necessary to perform voltage regulation control on the output voltage, and the voltage regulation method of the wireless power transmission system includes frequency conversion control and phase shift control. The variable frequency control realizes the adjustment of output voltage by changing the working frequency; the phase-shifting control is fixed frequency control, and the output voltage is adjusted by adjusting the square wave voltage duty ratio output by an inverter circuit in the wireless power transmission system.
However, when the voltage is regulated by adopting the variable frequency control, the transmission efficiency of the wireless power transmission system is low due to the wide variation range of the working frequency, and when the voltage is regulated by adopting the phase shift control, the switching device in the inverter circuit cannot realize zero voltage on, so that the loss is increased.
Disclosure of Invention
The invention aims to at least solve the technical problems of low transmission efficiency and large loss of a wireless power transmission system in the voltage regulation process in the related technology to a certain extent, and provides a phase shift control method and device of the wireless power transmission system and wireless electrical equipment.
In a first aspect, an embodiment of the present invention provides a phase shift control method of a wireless power transmission system, where the wireless power transmission system includes a wireless transmitting module for wirelessly transmitting electric energy, and a wireless receiving module for wirelessly receiving electric energy, where the wireless transmitting module includes a full-bridge inverter circuit, and where the wireless receiving module is connected to a load, and the method includes:
acquiring a target input inductance curve under a target load resistance value, wherein the input inductance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductance value;
determining a target input inductance value and a target working frequency corresponding to the target input inductance value based on the target input inductance curve, wherein the target input inductance value enables the wireless power transmission system to be inductive;
and adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching.
In some embodiments, the obtaining the target input inductance curve under the target load resistance value includes:
acquiring N input inductance curves under N load resistance values, wherein N is an integer greater than 1;
determining the maximum value of the inductive reactance of each input inductive reactance curve in a preset working frequency range according to each input inductive reactance curve, and obtaining N maximum values of the inductive reactance;
and determining M maximum values of the inductive reactance meeting a preset inductive reactance value range from the N maximum values of the inductive reactance, and taking an inductive reactance curve corresponding to the minimum value in the M maximum values of the inductive reactance as the target input inductive reactance curve, wherein the lower limit of the preset inductive reactance value range is larger than 0, and M is a positive integer.
In some embodiments, the determining a target input inductance value and a target operating frequency corresponding to the target input inductance value based on the target input inductance curve includes:
determining the maximum value of the inductance of the target input inductance curve in a preset working frequency range as the target input inductance value;
and determining a target working frequency corresponding to the target input inductance value based on the target input inductance curve.
In some embodiments, the method further comprises:
determining a resonant frequency of the wireless power transmission system;
and determining the preset working frequency based on the resonant frequency, wherein the upper limit of the preset working frequency is smaller than the resonant frequency.
In some embodiments, the adjusting the operating frequency of the wireless power transmission system to the target operating frequency and performing phase shift control includes:
adjusting the working frequency of the wireless power transmission system to the target working frequency;
acquiring the actual output voltage and the target output voltage of the wireless receiving module;
and determining a target phase shift angle of a lag arm relative to a lead arm in the full-bridge inverter circuit based on the voltage difference between the actual output voltage and the target output voltage, and controlling the switching-on and switching-off of a switching device in the full-bridge inverter circuit based on the target phase shift angle.
In some embodiments, the determining a target phase shift angle of a trailing arm relative to a leading arm in the full bridge inverter circuit based on a voltage difference between the actual output voltage and the target output voltage includes:
and performing proportional-integral control on the voltage difference to obtain the target phase shift angle.
In a second aspect, an embodiment of the present invention provides a phase shift control device of a wireless power transmission system, where the wireless power transmission system includes a wireless transmitting module for wirelessly transmitting electric energy, and a wireless receiving module for wirelessly receiving electric energy, where the wireless transmitting module includes a full-bridge inverter circuit, and the wireless receiving module is connected to a load, and the device includes:
the acquisition module is used for acquiring a target input inductive reactance curve under a target load resistance value, wherein the input inductive reactance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductive reactance value;
the processing module is used for determining a target input inductive reactance value and a target working frequency corresponding to the target input inductive reactance value based on the target input inductive reactance curve, wherein the target input inductive reactance value enables the wireless power transmission system to be inductive;
and the adjusting module is used for adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching.
In a third aspect, an embodiment of the present invention provides a radio apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the program to implement the method according to any one of the embodiments of the first aspect.
In some embodiments, the wireless appliance device is a wireless air conditioning unit.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method provided in the first aspect.
The one or more technical schemes provided by the embodiment of the invention at least realize the following technical effects or advantages:
in the control method of the wireless power transmission system provided by the embodiment of the specification, the wireless power transmission system comprises a wireless transmitting module for transmitting electric energy and a wireless receiving module for receiving the electric energy wirelessly, wherein the wireless transmitting module comprises a full-bridge inverter circuit, and the wireless receiving module is connected with a load. When the phase shift control is carried out on the wireless power transmission system, a target input inductive reactance curve under a target load resistance value is obtained, wherein the input inductive reactance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductive reactance value; determining a target input inductance value and a target working frequency corresponding to the target input inductance value based on a target input inductance curve, wherein the target input inductance value enables the wireless power transmission system to be inductive; and adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching. According to the scheme in the embodiment of the specification, the working frequency of the wireless power transmission system is adjusted to be the target working frequency, so that the wireless power transmission system is inductive, and the voltage can lead the current to act in an inductive circuit, so that for the switching device of the full-bridge inverter circuit, the voltage at two ends of the switching device can be reduced to zero before the switching device is turned on, so that the voltage and the current at two ends of the switching device are not changed for a crossing time, and the loss of the switching device is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a phase shift control method of a wireless power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a wireless power transmission system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing N input inductance curves corresponding to N load resistances in an embodiment of the present invention;
FIG. 4 is a diagram showing simulated voltage waveforms for a wireless power transmission system operating at a resonant frequency in accordance with an embodiment of the present invention;
fig. 5 is a waveform diagram of a simulation voltage when the wireless power transmission system operates at a target operating frequency in an embodiment of the present invention;
fig. 6 is a schematic diagram of a phase shift control device of a wireless power transmission system according to an embodiment of the present invention;
fig. 7 shows a schematic diagram of a radio device in an embodiment of the invention.
Detailed Description
In view of the technical problem of large loss in voltage regulation of a wireless power transmission system through phase shift control in the related art, the embodiment of the specification provides a phase shift control method and device of the wireless power transmission system and wireless electrical equipment, and the wireless power transmission system is inductive by adjusting the working frequency of the wireless power transmission system to a target working frequency, and the voltage of a switching device in a full-bridge inverter circuit can be reduced to zero before the switching device is turned on, so that the voltage and current changes at two ends of the switching device have no crossing time, and the loss of the switching device is reduced.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Next, a phase shift control method of a wireless power transmission system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a flowchart of a phase shift control method of a wireless power transmission system according to an embodiment of the present disclosure is provided, where the method includes the following steps:
step S101: acquiring a target input inductance curve under a target load resistance value, wherein the input inductance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductance value;
step S102: determining a target input inductance value and a target working frequency corresponding to the target input inductance value based on the target input inductance curve, wherein the target input inductance value enables the wireless power transmission system to be inductive;
step S103: and adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching.
The method provided by the embodiment of the specification can be applied to a wireless power transmission system, and the wireless power transmission system can be mounted in electrical equipment, such as a wireless air conditioner, a wireless air purifier and the like comprising the wireless power transmission system.
It should be noted that the wireless power transmission system includes a wireless transmitting module and a wireless receiving module, where the wireless transmitting module is used for transmitting electric energy to the outside wirelessly, and the wireless receiving module is used for receiving the electric energy transmitted by the wireless transmitting module and outputting a stable voltage or current signal.
For ease of understanding, a specific circuit configuration of the wireless power transmission system will be described below. As shown in fig. 2, the wireless transmitting module of the wireless power transmission system may include a dc power supply, a full-bridge inverter circuit, and a transmitting-end compensation capacitor C T Transmitting coilL T Internal resistance R of transmitting coil T The full-bridge inverter circuit consists of 4 MOS tubes (Q1, Q2, Q3 and Q4); the wireless receiving module of the wireless power transmission system may include a receiving coil L R Internal resistance R of receiving coil R Receiving-end compensation capacitor C R Rectifying circuit, electrolytic capacitor, and load R L The rectifying circuit may be selected according to actual needs, for example, the rectifying circuit is a full-bridge rectifying circuit.
In the wireless power transmission system in fig. 2, the wireless transmitting module can convert direct current into alternating current through the full-bridge inverter circuit and pass through the transmitting end compensation capacitor C T From the transmitting coil L T And transmitting outwards wirelessly. The wireless receiving module can pass through the receiving coil L R Receiving alternating current emitted by the wireless emitting module and passing through the receiving end compensation capacitor C R Transmitting the alternating current to a rectifying circuit, and converting the alternating current into direct current by the rectifying circuit to a load R L Providing electrical energy.
Of course, the circuit structure of the wireless power transmission system can be adjusted and deformed according to actual needs, and the wireless power transmission system is not limited herein. In order to facilitate the description of the voltage control method provided in the embodiment of the present specification, a circuit configuration in fig. 2 will be described as an example.
In step S101, the target load resistance may be one of a plurality of load resistances corresponding to the wireless power transmission system, for example, the load resistance corresponding to the wireless air conditioner operating in the dehumidification mode may be different from the load resistance corresponding to the wireless air conditioner operating in the refrigeration mode, and when the target load resistance is determined, the load resistance of the wireless air conditioner in various operating states may be determined first, and then the target load resistance is determined therefrom. The target load resistance value may also be a preset load resistance value, for example, in order to simulate the voltage regulation condition of the wireless power transmission system, a plurality of load resistance values may be preset, and the target load resistance value may be one of the load resistance values.
In this embodiment of the present disclosure, different load resistance values and corresponding input inductance curves are different, where the input inductance curves are used to represent a correspondence between an operating frequency of a wireless power transmission system and an input inductance value. In a specific implementation, the input inductance value may be calculated by the following formula:
wherein X is in For inputting inductance value, omega is working frequency of wireless power transmission system, L T For self-inductance of the transmitting coil, L R C for self-inductance of the receiving coil T Compensating capacitance for transmitting end, C R To compensate the capacitance at the receiving end, R R For receiving the internal resistance of the coil, R L And M is the mutual inductance of the transmitting coil and the receiving coil. From the above formula, R L Different, X in The input inductance curve is also different from ω.
In this embodiment of the present disclosure, an input inductance curve under a plurality of load resistance values may be predetermined, and then a target input inductance curve under a target load resistance value may be selected from the plurality of input inductance curves, specifically, step S101 may be implemented by: acquiring N input inductance curves under N load resistance values, wherein N is an integer greater than 1; determining the maximum value of the inductive reactance of each input inductive reactance curve in a preset working frequency range according to each input inductive reactance curve, and obtaining N maximum values of the inductive reactance; and determining M maximum values of the inductive reactance meeting a preset inductive reactance value range from the N maximum values of the inductive reactance, and taking an inductive reactance curve corresponding to the minimum value in the M maximum values of the inductive reactance as the target input inductive reactance curve, wherein the lower limit of the preset inductive reactance value range is larger than 0, and M is a positive integer.
Specifically, the N load resistances may be a plurality of load resistances that the wireless power transmission system can actually access, or may be a plurality of preset load resistances, which is not limited herein. As shown in fig. 3, a schematic diagram of N input inductance curves corresponding to N load resistance values is shown, where N is 7, and the load resistance values are 2Ω, 4Ω, 6Ω … Ω in order. In fig. 3, the ordinate is the imaginary part of the input impedance, i.e. the corresponding input inductive reactance, and the abscissa is the normalized frequency, which is equal to the actual operating frequency divided by the resonant frequency.
Further, for each input inductive reactance curve, determining an inductive reactance maximum value in a preset working frequency range, wherein the preset working frequency range can be set according to actual needs. In the embodiment of the present disclosure, considering that the closer the operating frequency is to the resonant frequency, the higher the coil transmission efficiency is, and the lower the operating frequency is to be away from the resonant frequency, the preset operating frequency range may be selected near the resonant frequency, so as to improve the coil transmission efficiency.
In one embodiment, the determining manner of the preset operating frequency range may be: determining a resonant frequency of the wireless power transmission system; and determining the preset working frequency based on the resonant frequency, wherein the upper limit of the preset working frequency is smaller than the resonant frequency. For example, the preset operating frequency is a range smaller than the resonant frequency, or a lower limit and/or an upper limit of the preset operating frequency are set, for example, the upper limit is an operating frequency different from the resonant frequency by a first threshold, and the difference between the upper limit and the lower limit is a second threshold, wherein the first threshold and the second threshold can be defined according to actual needs.
The preset frequency range in the embodiment of the present disclosure is a frequency range corresponding to the region (1) in fig. 3. The determination of the region (1) may be: and determining an input inductance curve with the minimum load resistance, determining two points with zero input inductance in a range smaller than the resonance frequency, and taking the working frequencies corresponding to the two points as the upper limit and the lower limit of a preset working frequency range respectively.
For each input inductance curve, determining the maximum value of the inductance of each curve in the area (1), and obtaining N maximum values of the inductance in total. For example, in a switching device, for example, a MOS transistor or an IGBT transistor, the voltage across the switching device is 0 when the switching device is turned on, the voltage across the switching device is an input voltage when the switching device is turned off, the voltage across the switching device is reduced from the input voltage to 0 when the switching device is switched from an off state to an on state, the current is increased from 0 to a steady-state current, and if there is a crossover between the rising and falling times of the voltage and the current, the product of the voltage and the current is not 0 during the crossover time, and there is a loss. Zero voltage on means that the voltage across the switching device has dropped to 0 before it is on, so that there is no crossover time between the voltage and current, and loss can be reduced. Therefore, to realize zero-voltage turn-on, the voltage can be advanced to act in current, the characteristics of the inductor are voltage advanced current, the effect of the inductor in the circuit is represented as inductance, so that the larger the inductance value is, the more the voltage can be advanced to act in current, and the zero-voltage turn-on, namely the soft switch, is easier to realize. Therefore, in order to realize soft switching of the switching device, the embodiment of the present specification may set the operating frequency of the wireless power transmission system at the frequency corresponding to the maximum value of the inductance, but there is a shift in the frequency corresponding to the maximum value of the inductance under different load resistance values, and therefore, it is necessary to further screen out the target operating frequency from the frequencies corresponding to the maximum values of the inductance.
Since the inductance value decreases with an increase in the load resistance value in a range smaller than the resonance frequency, it is more difficult to realize zero-voltage turn-on of the switching device as the load resistance value increases. Therefore, in the embodiment of the present specification, the operating frequency corresponding to the larger load resistance value may be selected as the target operating frequency, so that soft switching can be realized even under the larger load resistance value. Specifically, first, M maximum values of inductance (M is a positive integer) satisfying a preset range of values of inductance are determined from N maximum values of inductance, and since the circuit is not inductive when the value of inductance is 0, soft switching of the switching device cannot be achieved, so that the preset range of inductance can be selected to be a range of which the value of inductance is greater than 0, and of course, the preset range of inductance can be set as required, for example, the lower limit of the preset range of inductance is greater than 5Ω, 8Ω, and the like. Further, an input inductance curve corresponding to the minimum value of the M maximum values of the inductance is set as a target input inductance curve, and a load resistance value corresponding to the inductance curve is set as a target load resistance value.
As shown in fig. 3, taking the case where the preset inductance range is greater than 0 as an example, when the load resistance is 12Ω, the maximum value of the inductance of the input inductance curve corresponding to 12Ω is 0 in the region (1), the maximum value of the inductance of the input inductance curve corresponding to 10Ω is greater than 0 in the region (1), and the maximum values of the inductance corresponding to other load resistances smaller than 10Ω are both greater than the maximum value of the inductance corresponding to 10Ω, so that 10Ω can be regarded as the target load resistance, and the input inductance curve corresponding to 10Ω can be regarded as the target input inductance curve.
Further, in step S102, after the target input inductance curve is determined, the target input inductance value and the target operating frequency corresponding to the target input inductance value are determined based on the target input inductance curve. The target input inductance value is an inductance value that causes the wireless power transmission system to be inductive. In one embodiment, the target S102 may be achieved by: determining the maximum value of the inductance of the target input inductance curve in a preset working frequency range as the target input inductance value; and determining a target working frequency corresponding to the target input inductance value based on the target input inductance curve.
Specifically, as can be seen from the above description, the closer the operating frequency is to the resonant frequency, the higher the transmission efficiency of the coil, and the greater the input inductance value, the more advantageous it is to achieve zero-voltage turn-on of the switching device. The determination of the preset operating frequency range has been described above, and will not be described herein.
In step S103, the operating frequency of the wireless power transmission system is adjusted to the target operating frequency, and phase shift control is performed on the wireless power transmission system to output a stable voltage.
The working frequency of the wireless power transmission system can be the switching frequency of a switching device in the full-bridge inverter circuit, the switching frequency of the switching device is controlled to adjust the alternating current frequency output by the full-bridge inverter circuit, and soft switching of the switching device can be realized under the target working frequency. Meanwhile, in order to realize stable voltage output, the phase shift control is performed on the wireless power transmission system, and the phase shift angle between the lagging arm and the leading arm of the full-bridge inverter circuit is set. As shown in fig. 2, the leading arms in the full-bridge inverter circuit are Q1 and Q2, the lagging arms are Q3 and Q4, and the phase shift angle of the lagging arm in the full-bridge inverter circuit relative to the leading arm may be Q4 lagging the angle at which Q1 is turned on.
The phase shift control of the wireless power transmission system can be realized by the following modes: adjusting the working frequency of the wireless power transmission system to the target working frequency; acquiring the actual output voltage and the target output voltage of the wireless receiving module; and determining a target phase shift angle of a lag arm relative to a lead arm in the full-bridge inverter circuit based on the voltage difference between the actual output voltage and the target output voltage, and controlling the switching-on and switching-off of a switching device in the full-bridge inverter circuit based on the target phase shift angle.
Specifically, the actual output voltage of the wireless receiving module can be obtained by detecting the voltage across the load, and as shown in fig. 2, the actual output voltage can be the load resistance R L The voltage across it. The target output voltage of the wireless receiving module can be a desired output voltage, and the target output voltage can be adjusted and set according to actual needs, which is not limited herein.
In order to output a stable voltage, the actual output voltage needs to be stabilized near the target output voltage, and in this embodiment of the present disclosure, the target phase shift angle may be obtained by performing proportional-integral control on the voltage difference between the actual output voltage and the target output voltage.
Specifically, the proportional-integral control of the voltage difference can be achieved through a proportional-integral control circuit, the proportional-integral control circuit can be arranged at the receiving end or the transmitting end, the proportional-integral control circuit is arranged at the transmitting end for example, and the proportional-integral control circuit can be arranged in a wireless transmitting module or can be independently arranged as an independent circuit. In the specific implementation process, when the actual output voltage is higher than the target output voltage, the voltage difference is accumulated in the forward direction through PI control (Proportional Integral Control ), and the voltage difference is added with the current phase shift angle to obtain a new phase shift angle, namely the target phase shift angle. When the actual output voltage is lower than the target output voltage, the voltage difference is reversely accumulated through PI control, and the accumulated quantity is subtracted on the basis of the current phase shift angle to obtain a new phase shift angle, namely the target phase shift angle.
Further, the phase shift angle of the lag arm relative to the lead arm in the full-bridge inverter circuit is set as a target phase shift angle so as to stabilize the actual output voltage near the target output voltage.
In order to better explain the control method provided in the embodiments of the present specification, the following system parameters are taken as examples to simulate the operation of the wireless power transmission system, where the input voltage U of the dc power supply in =311V, mutual inductance m=21uh between transmitting coil and receiving coil, transmitting end compensation capacitance C T = 31.349nF, transmitting coil self-inductance L T =60 uH, receiving coil self-inductance L R =60 uH, internal resistance of transmitting coil R T =0.05Ω, receiver compensating capacitor C T = 31.349nF, internal resistance of receiving coil R R The resonance frequency of the wireless power transmission system is 116kHz, the target load resistance is 10Ω, and in the input inductive reactance curve corresponding to the target load resistance, the target frequency corresponding to the maximum inductive reactance value in the preset working frequency range is 110kHz.
As shown in fig. 4, the voltage waveform diagram is a simulation voltage waveform diagram when the wireless power transmission system works at a resonant frequency of 116kHz, where a diagram a in fig. 4 is a simulation voltage waveform diagram of a source-drain Voltage (VDS) and a driving Voltage (VGS) of a trailing arm switching device, B diagram is a voltage waveform diagram actually output by the wireless power transmission system, VO in the diagram represents an actual output voltage, C diagram is a target phase shift angle between a trailing arm and a leading arm in a full-bridge inverter circuit, VGS1 is a driving voltage waveform diagram of the leading arm switching device, and VGS4 is a driving voltage waveform diagram of the trailing arm switching device. Specifically, as can be seen from the graph a of fig. 4, VDS does not drop to 0 before VGS changes from low to high, there is a crossover between the two, and therefore zero voltage turn-on of the hysteresis arm is not achieved.
Fig. 5 is a simulated voltage waveform diagram of the wireless power transmission system when working at a target working frequency of 110kHz, where fig. 5 is a simulated voltage waveform diagram of a source-drain Voltage (VDS) and a driving Voltage (VGS) of a trailing arm switching device, fig. B is a voltage waveform diagram actually output by the wireless power transmission system, fig. C is a target phase shift angle between a trailing arm and a leading arm in a full-bridge inverter circuit, VGS1 is a driving voltage waveform diagram of a leading arm switching device, and VGS4 is a driving voltage waveform diagram of a trailing arm switching device. Specifically, as can be seen from the a-plot of fig. 5, VDS has fallen to 0 before VGS changes from low to high, achieving zero voltage turn-on of the hysteresis arm.
In summary, in the solution in the embodiment of the present disclosure, the operating frequency of the wireless power transmission system is set to the target operating frequency corresponding to the maximum value of the inductance, and since the target operating frequency is close to the resonant frequency, the transmission efficiency can be effectively improved.
Based on the same inventive concept, the embodiments of the present disclosure provide a phase shift control device of a wireless power transmission system, where the wireless power transmission system includes a wireless transmitting module for wirelessly transmitting electric energy, and a wireless receiving module for wirelessly receiving electric energy, where the wireless transmitting module includes a full-bridge inverter circuit, and the wireless receiving module is connected to a load, as shown in fig. 6, and the device includes:
the obtaining module 601 is configured to obtain a target input inductance curve under a target load resistance value, where the input inductance curve is used to characterize a correspondence between a working frequency of the wireless power transmission system and an input inductance value;
a processing module 602, configured to determine a target input inductance value and a target operating frequency corresponding to the target input inductance value based on the target input inductance curve, where the target input inductance value makes the wireless power transmission system inductive;
and the adjusting module 603 is configured to adjust the operating frequency of the wireless power transmission system to the target operating frequency and perform phase shift control, so that the switching device of the full-bridge inverter circuit performs soft switching.
In some embodiments, the obtaining module 601 is configured to:
acquiring N input inductance curves under N load resistance values, wherein N is an integer greater than 1;
determining the maximum value of the inductive reactance of each input inductive reactance curve in a preset working frequency range according to each input inductive reactance curve, and obtaining N maximum values of the inductive reactance;
and determining M maximum values of the inductive reactance meeting a preset inductive reactance value range from the N maximum values of the inductive reactance, and taking an inductive reactance curve corresponding to the minimum value in the M maximum values of the inductive reactance as the target input inductive reactance curve, wherein the lower limit of the preset inductive reactance value range is larger than 0, and M is a positive integer.
In some implementations, the processing module 602 is configured to:
determining the maximum value of the inductance of the target input inductance curve in a preset working frequency range as the target input inductance value;
and determining a target working frequency corresponding to the target input inductance value based on the target input inductance curve.
In some embodiments, the apparatus further comprises:
a first determining module, configured to determine a resonant frequency of the wireless power transmission system;
and the second determining module is used for determining the preset working frequency based on the resonant frequency, wherein the upper limit of the preset working frequency is smaller than the resonant frequency.
In some embodiments, the adjustment module 603 is configured to:
adjusting the working frequency of the wireless power transmission system to the target working frequency;
acquiring the actual output voltage and the target output voltage of the wireless receiving module;
and determining a target phase shift angle of a lag arm relative to a lead arm in the full-bridge inverter circuit based on the voltage difference between the actual output voltage and the target output voltage, and controlling the switching-on and switching-off of a switching device in the full-bridge inverter circuit based on the target phase shift angle.
In some embodiments, the adjustment module 603 is configured to:
and performing proportional-integral control on the voltage difference to obtain the target phase shift angle.
With respect to the above apparatus, specific functions of the respective modules have been described in detail in the embodiments of the phase shift control method of the wireless power transmission system provided in the embodiments of the present specification, and will not be described in detail herein.
An embodiment of the present invention provides a wireless electrical apparatus, as shown in fig. 7, including a memory 704, a processor 702, and a computer program stored in the memory 704 and capable of running on the processor 702, where the processor 702 implements the foregoing phase shift control method of the wireless power transmission system when executing the program. The electrical equipment can be a wireless air conditioning unit or other equipment carrying a wireless power transmission system.
Where in FIG. 7 a bus architecture (represented by bus 700), bus 700 may comprise any number of interconnected buses and bridges, with bus 700 linking together various circuits, including one or more processors, as represented by processor 702, and memory, as represented by memory 704. Bus 700 may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be described further herein. Bus interface 707 provides an interface between bus 700 and receiver 701 and transmitter 703. The receiver 701 and the transmitter 703 may be the same element, i.e. a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The processor 702 is responsible for managing the bus 700 and general processing, while the memory 704 may be used to store data used by the processor 702 in performing operations.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A phase shift control method of a wireless power transmission system, wherein the wireless power transmission system includes a wireless transmitting module for wirelessly transmitting electric energy, and a wireless receiving module for wirelessly receiving electric energy, the wireless transmitting module includes a full-bridge inverter circuit, and the wireless receiving module is connected with a load, the method comprising:
acquiring a target input inductance curve under a target load resistance value, wherein the input inductance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductance value;
determining a target input inductance value and a target working frequency corresponding to the target input inductance value based on the target input inductance curve, wherein the target input inductance value enables the wireless power transmission system to be inductive;
and adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching.
2. The method of claim 1, wherein the obtaining a target input inductance curve at a target load resistance value comprises:
acquiring N input inductance curves under N load resistance values, wherein N is an integer greater than 1;
determining the maximum value of the inductive reactance of each input inductive reactance curve in a preset working frequency range according to each input inductive reactance curve, and obtaining N maximum values of the inductive reactance;
and determining M maximum values of the inductive reactance meeting a preset inductive reactance value range from the N maximum values of the inductive reactance, and taking an inductive reactance curve corresponding to the minimum value in the M maximum values of the inductive reactance as the target input inductive reactance curve, wherein the lower limit of the preset inductive reactance value range is larger than 0, and M is a positive integer.
3. The method of claim 1, wherein the determining a target input inductance value and a target operating frequency corresponding to the target input inductance value based on the target input inductance curve comprises:
determining the maximum value of the inductance of the target input inductance curve in a preset working frequency range as the target input inductance value;
and determining a target working frequency corresponding to the target input inductance value based on the target input inductance curve.
4. A method according to claim 2 or 3, wherein the method further comprises:
determining a resonant frequency of the wireless power transmission system;
and determining the preset working frequency based on the resonant frequency, wherein the upper limit of the preset working frequency is smaller than the resonant frequency.
5. The method of claim 1, wherein adjusting the operating frequency of the wireless power transmission system to the target operating frequency and performing phase shift control comprises:
adjusting the working frequency of the wireless power transmission system to the target working frequency;
acquiring the actual output voltage and the target output voltage of the wireless receiving module;
and determining a target phase shift angle of a lag arm relative to a lead arm in the full-bridge inverter circuit based on the voltage difference between the actual output voltage and the target output voltage, and controlling the switching-on and switching-off of a switching device in the full-bridge inverter circuit based on the target phase shift angle.
6. The method of claim 5, wherein determining a target phase shift angle of a trailing arm relative to a leading arm in the full-bridge inverter circuit based on a voltage difference between the actual output voltage and the target output voltage comprises:
and performing proportional-integral control on the voltage difference to obtain the target phase shift angle.
7. A phase shift control device of a wireless power transmission system, wherein the wireless power transmission system includes a wireless transmitting module for wirelessly transmitting electric energy and a wireless receiving module for wirelessly receiving electric energy, the wireless transmitting module includes a full-bridge inverter circuit, the wireless receiving module is connected with a load, the device includes:
the acquisition module is used for acquiring a target input inductive reactance curve under a target load resistance value, wherein the input inductive reactance curve is used for representing the corresponding relation between the working frequency of the wireless power transmission system and the input inductive reactance value;
the processing module is used for determining a target input inductive reactance value and a target working frequency corresponding to the target input inductive reactance value based on the target input inductive reactance curve, wherein the target input inductive reactance value enables the wireless power transmission system to be inductive;
and the adjusting module is used for adjusting the working frequency of the wireless power transmission system to the target working frequency and performing phase shift control so as to enable the switching device of the full-bridge inverter circuit to perform soft switching.
8. A radio device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any of claims 1-6 when the program is executed.
9. The wireless appliance device of claim 8, wherein the wireless appliance device is a wireless air conditioning unit.
10. A computer readable storage medium, characterized in that a computer program is stored thereon, which program, when being executed by a processor, implements the steps of the method according to any of claims 1-6.
CN202210044721.7A 2022-01-14 2022-01-14 Phase shift control method and device for wireless power transmission system and wireless electrical equipment Pending CN116488357A (en)

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CN202210044721.7A CN116488357A (en) 2022-01-14 2022-01-14 Phase shift control method and device for wireless power transmission system and wireless electrical equipment

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