CN114421634A - Wireless power transmission system and method - Google Patents
Wireless power transmission system and method Download PDFInfo
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- CN114421634A CN114421634A CN202111584688.9A CN202111584688A CN114421634A CN 114421634 A CN114421634 A CN 114421634A CN 202111584688 A CN202111584688 A CN 202111584688A CN 114421634 A CN114421634 A CN 114421634A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
Abstract
The invention discloses a wireless electric energy transmission system and a method, which comprises a three-phase alternating current input end, a three-phase matrix converter, a transmitting end and a receiving end, wherein a filter is used for filtering high-frequency power grid current from a three-phase alternating current power supply to obtain input voltage, a digital signal processor is used for calculating set load voltage and actual load voltage to obtain PWM (pulse width modulation) signals, the PWM signals are used for controlling the on and off of the three-phase matrix converter, the input voltage is input into the matrix processor to obtain high-frequency voltage, the transmitting end is excited by the high-frequency voltage to generate a high-frequency magnetic field, and the high-frequency magnetic field acts on the receiving end to generate current in a coupling manner, so that wireless electric energy transmission is realized; the invention realizes the application of high power level by controlling the on-off of the bidirectional switch in the matrix processor, and realizes the capability of directly controlling the load voltage and the load current by the digital signal processor.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a wireless power transmission system and method.
Background
A matrix converter: the matrix converter is a novel AC-AC power converter, does not need an intermediate DC energy storage link, and can directly realize the conversion of parameters such as AC phase, amplitude, frequency and the like.
Wireless Power Transfer (WPT): the wireless power transmission means that the electric energy is converted into relay energy in other forms through a transmitter, and after the relay energy is transmitted for a certain distance in the air, the relay energy is converted into the electric energy through a receiver, so that the wireless power transmission is realized. WPT is referred to herein as wireless power transfer.
In recent years, high-power devices such as portable electric appliances, household appliances, and electric vehicles require charging or battery power supply. Frequent plugging and unplugging of power supply wires is inconvenient and attractive, and potential safety hazards exist in rainy and snowy weather, so that the wireless charging technology is paid more and more attention. The rectifier link of a conventional WPT system usually uses an electrolytic capacitor to stabilize a direct current voltage, and the capacitor is large in size, expensive and short in service life, so that the WPT system is not stable enough. The existing single-phase matrix converter directly applies 20kHz pulse voltage to a resonant network of a bidirectional non-contact interface. However, due to the current limitation of the power grid, the matrix converter cannot meet the application of high power level and has no direct load voltage/current control capability. Therefore, it is necessary to design a wireless power transmission system that can satisfy high power and can directly control the load voltage at the transmitting end.
Disclosure of Invention
The invention aims to provide a wireless power transmission system and a wireless power transmission method, which aim to solve the problem that the conventional matrix converter cannot meet high power and has no direct load voltage/current control capability.
To solve the above technical problem, the present invention provides a wireless power transmission system and method, including:
the system comprises a three-phase alternating current input end, a three-phase matrix converter comprising 6 bidirectional switches, a transmitting end, a receiving end and a digital signal processor;
the three-phase alternating current input end is used for transmitting input voltage to the three-phase matrix converter;
the digital signal processor is used for calculating and modulating a set load voltage and an actual load voltage after detecting a voltage phase value of a power grid, generating a PWM signal and transmitting the PWM signal to the three-phase matrix converter;
the three-phase matrix converter is used for receiving the PWM signal and the input voltage, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal and outputting high-frequency voltage;
the transmitting end is used for transmitting the coil to be powered by the high-frequency voltage so as to generate a high-frequency magnetic field under the excitation of a power supply;
and the receiving end is used for generating current under the action of the high-frequency magnetic field.
Preferably, the three-phase matrix converter includes:
and 6 bidirectional switches, wherein every two bidirectional switches are arranged on the same bridge arm of the three-phase matrix converter, and each bidirectional switch comprises two MOSFETs.
Preferably, the digital signal processor includes:
proportional-integral controller, digital phase-locked loop, PWM generator;
the proportional-integral controller is used for generating a reference vector by taking the difference value between the set load voltage and the actual load voltage as an error;
the digital phase-locked loop is used for detecting the voltage phase value of the power grid and selecting a target sector and an effective voltage vector corresponding to the target sector in 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain a reference vector;
wherein each sector comprises 6 effective voltage vectors and 3 zero voltage vectors;
and the PWM generator is used for generating PWM signals based on the driving of the reference vector, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter and outputting a target high-frequency voltage corresponding to the set load voltage.
Preferably, the three-phase power input terminal includes:
a three-phase power input and input filter;
the three-phase power input is used for providing power for the wireless power transmission system;
the input filter is used for effectively filtering the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain the power signal of the specific frequency.
Preferably, the transmitting end includes:
transmitting terminal compensation capacitor CTTransmitting end compensation inductance Lf1Transmitting end transmitting coil LT；
Preferably, the receiving end includes:
receiving end compensation capacitor CRReceiving end compensation inductance Lf2Receiving end receiving coil LR；
Preferably, the receiving end includes:
and the diode rectifier bridge is used for stabilizing the direct-current voltage of the receiving end.
Preferably, a wireless power transmission method includes:
providing an input voltage to the three-phase matrix converter using the three-phase AC input;
after the digital signal processor is used for detecting the phase value of the power grid voltage, calculating and modulating actual load voltage to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter;
receiving the PWM signal and the input voltage by using the three-phase matrix converter, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and outputting high-frequency voltage;
exciting a transmitting end by using the high-frequency voltage to generate a high-frequency magnetic field;
and the high-frequency magnetic field acts on the receiving end, and the current is generated by coupling, so that wireless electric energy transmission is realized.
Preferably, the three-phase matrix converter includes:
and 6 bidirectional switches, wherein every two bidirectional switches are arranged on the same bridge arm of the three-phase matrix converter, and each bidirectional switch comprises two MOSFETs.
Preferably, the calculating and modulating actual load voltage after detecting the phase value of the grid voltage by using the digital signal processor to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter includes:
the digital signal processor comprises a proportional-integral controller, a digital phase-locked loop and a PWM generator;
generating a reference vector by using the difference value of the set load voltage and the actual load voltage as an error by using the proportional-integral controller;
detecting the voltage phase value of the power grid by using the digital phase-locked loop, and selecting a target sector and an effective voltage vector corresponding to the target sector in 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain a reference vector;
and driving a PWM generator by using the reference vector to generate a PWM signal, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter, and outputting a target high-frequency voltage corresponding to the set load voltage.
The invention provides a wireless electric energy transmission system and a method, wherein the three-phase alternating current input end is used for providing input voltage to a three-phase matrix converter, the digital signal processor is used for detecting the voltage phase value of a power grid and then calculating and modulating actual load voltage to obtain a PWM signal, the PWM signal is transmitted to the three-phase matrix converter, the three-phase matrix converter is used for receiving the PWM signal and the input voltage, the on-off of a bidirectional switch in the three-phase matrix converter is controlled according to the PWM signal to output high-frequency voltage, the high-frequency voltage is used for exciting a transmitting end to generate a high-frequency magnetic field, the high-frequency magnetic field acts on a receiving end to generate current in a coupling mode, and wireless electric energy transmission is realized. The invention outputs high-frequency voltages with different frequencies by controlling the on-off of the bidirectional switch in the matrix processor, realizes the application of high power level, and realizes the capability of directly controlling load voltage and load current by calculating the set load voltage and the actual load voltage to generate a reference vector through the proportional-integral controller in the digital signal processor.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a block diagram of a wireless power transmission system according to the present invention;
FIG. 2 is a three-phase grid voltage and corresponding sector provided by the present invention;
fig. 3 is a flowchart of a first embodiment of a wireless power transmission system according to the present invention;
FIG. 4 is a diagram of a digital signal processor direct load voltage control scheme provided by the present invention;
FIG. 5 is a composite view of reference vectors provided by the present invention;
fig. 6 is a vector ordering diagram of the power switches provided by the present invention.
Detailed Description
The core of the invention is to provide a wireless power transmission system and a wireless power transmission method, which satisfy the application of wireless power transmission high power level by modulating the on-off state of a three-phase matrix converter and realize the capability of directly controlling load voltage and load current.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a wireless power transmission system provided by the present invention includes:
the system comprises a three-phase alternating current input end, a three-phase matrix converter comprising 6 bidirectional switches, a transmitting end, a receiving end and a digital signal processor;
the three-phase alternating current input end comprises a three-phase power input and an input filter, wherein the three-phase power input is used for providing a three-phase power for the whole system, and the input filter is used for effectively filtering a frequency point with a specific frequency in a power line or frequencies except the frequency point to obtain a power signal with the specific frequency;
the three-phase matrix converter comprises three bridge arms, wherein the same bridge arm comprises 2 bidirectional switches, and a three-phase power supply is converted into high-frequency voltage by adjusting the closing state of the bidirectional switches;
the digital signal processor comprises a proportional-integral controller, a digital phase-locked loop and a PWM generator, wherein the proportional-integral controller is used for generating a reference vector by taking a difference value between a set load voltage and an actual load voltage as an error, and the digital phase-locked loop is used for detecting a phase value of a power grid voltage and selecting an effective voltage vector corresponding to a target sector and the target sector from 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain the reference vector;
as shown in fig. 2: three-phase grid voltage and corresponding sectors;
wherein each sector comprises 6 effective voltage vectors and 3 zero voltage vectors;
and the PWM generator is used for generating PWM signals based on the driving of the reference vector, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter and outputting a target high-frequency voltage corresponding to the set load voltage.
The transmitting terminal comprises a transmitting terminal compensation capacitor CTTransmitting end compensation inductance Lf1Transmitting end transmitting coil LT；
The receiving end comprises a receiving end compensation capacitor CRReceiving end compensation inductance Lf2Receiving end receiving coil LR；
The three-phase alternating current input end is used for transmitting input voltage to the three-phase matrix converter;
the digital signal processor is used for calculating and modulating a set load voltage and an actual load voltage after detecting a voltage phase value of a power grid, generating a PWM signal and transmitting the PWM signal to the three-phase matrix converter;
the three-phase matrix converter is used for receiving the PWM signal and the input voltage, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal and outputting high-frequency voltage;
the transmitting end is used for generating a high-frequency magnetic field under the excitation of the high-frequency voltage;
and the receiving end is used for generating current under the action of the high-frequency magnetic field.
The wireless power transmission system provided by the embodiment can directly realize the phase, amplitude and frequency conversion of alternating current, a three-phase power supply can be converted into high-frequency voltage through selective output of different voltage vectors on the transmitting coil so as to drive the transmitting coil, a complex current conversion strategy is eliminated, the load voltage can be directly controlled, the LCL type compensation is added, the mutual inductance influence of each branch current is small, the system is stable, the robustness is good, and the receiving end adopts the diode rectifier bridge to stabilize the direct-current voltage.
Referring to fig. 3, fig. 3 is a flowchart illustrating a wireless power transmission method according to a first embodiment of the present invention, which includes the following steps:
step S301: filtering the high-frequency power grid current of the three-phase alternating current power supply by using the filter to obtain input voltage;
the wireless power transmission system provided by the invention introduces an LC filter, so that the obtained input voltage is as follows:
wherein u isA，uB，uCFor mains voltage，uiA，uiB，uiCFor input voltage, RLA，RLB，RLCIs a resistance of an input filter, LA，LB，LCIs the inductance value of the input filter, iA，iB，iCIs the gate current.
The relationship between the input current and the gate current is:
wherein diag denotes the diagonal matrix, CA，CB，CCRepresenting the capacitance value of the input filter.
Step S302: calculating and modulating a set load voltage and an actual load voltage after detecting the voltage phase value of the power grid by using the digital signal processor to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter;
the digital signal processor comprises a proportional-integral controller, a digital phase-locked loop and a PWM generator;
as shown in fig. 4: a digital signal processor direct load voltage control map;
generating a reference vector by using the difference value of the set load voltage and the actual load voltage as an error by using the proportional-integral controller;
detecting the voltage phase value of the power grid by using the digital phase-locked loop, and selecting a target sector and an effective voltage vector corresponding to the target sector in 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain a reference vector;
as shown in table 1, each sector and corresponding voltage vector;
TABLE 1 sector and corresponding Voltage vector selection
As shown in fig. 5, the vector composition map is referred to;
wherein d is1，d2，d0Are each V1，V2，V3The duty cycle of (c). V0Is a zero vector, VrefIs a reference vector. For example, in sector 1, the reference vector is:
Vref＝d1uab+d2uac+d0V0
＝d1(-uba)+d2(-uca)+d0V0.
the duty cycle of the voltage vector is calculated as follows:
d1＝m sin(π/3-θi)
d2＝m sin(θi)
d0＝1-d1-d2
where m is the modulation result produced by the PI controller.
As shown in table 2, each sector is associated with a calculated duty cycle;
TABLE 2 Pre-calculated duty cycle for each sector
X＝mcos(θi)，Y＝0.5X+m(sqrt(3)sin(θi)/4)，Z＝X-Y，θi＝θg- (sector-1) pi/3 + pi/6. ThetagThe resulting phase is calculated for the phase locked loop.
Since the trigonometric function calculation in one resonance period consumes a large amount of chip resources, the duty ratio of the calculation vector is simplified to avoid exceeding the control period;
and driving a PWM generator by using the reference vector to generate a PWM signal, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter, and outputting a target high-frequency voltage corresponding to the set load voltage.
After the digital signal processor is used for detecting the phase value of the power grid voltage, calculating and modulating actual load voltage to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter;
step S303: receiving the PWM signal and the input voltage by using the three-phase matrix converter, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and outputting high-frequency voltage;
as shown in table 3, the switching states of the three-phase matrix converter are processed by modulation, that is, the required high-frequency voltage is output;
said matrix converter turns on S1，S4Turn off the switch S2，S3，S5，S6I.e. can output voltage uab；
Said matrix converter turns on S2，S3Turn off the switch S1，S4，S5，S6I.e. can output voltage uba；
Table 3: switch states corresponding to the voltage vectors
The three-phase matrix converter receives the PWM signal and the input voltage, controls the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal and outputs high-frequency voltage;
as shown in fig. 6, the vector ordering of the power switches shows the vector arrangement for the first sector direct load voltage control. In the first half of the resonance period, two voltage vectors are arranged at the beginning of one resonance period, and one zero voltage vector is obtained from three zero voltage vectors to ensure a low number of switching states. Finally, the other negative and zero vectors form the other half of the resonant period.
If the on or off of each bidirectional switch is represented by S1, S2 … … S6, the emission terminal voltage is:
UTX＝[S1-S2 S3-S4 S5-S6][UA UB UC]T
where 1 and 0 represent the on and off states of the bi-directional switch, respectively, then the transmitter current can also be expressed as:
iTX＝[S1 S2 S3][iiA iiB iiC]T
step S304: exciting the transmitting end by using the high-frequency voltage to generate a high-frequency magnetic field;
step S305: and the high-frequency magnetic field acts on the receiving end, and the current is generated by coupling, so that wireless electric energy transmission is realized.
The wireless power transmission system provided by the embodiment eliminates the defect of unstable electrolytic capacitor by using a matrix transformation mode, enhances the power density of the system, outputs high-frequency voltages with different frequencies by controlling the on and off of a bidirectional switch in the matrix processor, realizes the application of a high power level, and realizes the capability of directly controlling the load voltage and the load current by calculating a set load voltage and an actual load voltage to generate a reference vector through a proportional-integral controller in a digital signal processor.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The above detailed description describes a wireless power transmission system and method provided by the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A wireless power transfer system, comprising:
the system comprises a three-phase alternating current input end, a three-phase matrix converter, a transmitting end, a receiving end and a digital signal processor;
the three-phase alternating current input end is used for transmitting input voltage obtained after filtering the power grid voltage to the three-phase matrix converter;
the digital signal processor is used for calculating and modulating a set load voltage and an actual load voltage after detecting a voltage phase value of a power grid, generating a PWM signal and transmitting the PWM signal to the three-phase matrix converter;
the three-phase matrix converter is used for receiving the PWM signal and the input voltage, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal and outputting high-frequency voltage;
the transmitting end is used for generating a high-frequency magnetic field under the excitation of the high-frequency voltage;
and the receiving end is used for generating current under the action of the high-frequency magnetic field.
2. A wireless power transfer system according to claim 1, wherein the three-phase matrix converter comprises:
and 6 bidirectional switches, wherein every two bidirectional switches are arranged on the same bridge arm of the three-phase matrix converter, and each bidirectional switch comprises two MOSFETs.
3. A wireless power transfer system as claimed in claim 2, wherein the digital signal processor comprises:
proportional-integral controller, digital phase-locked loop, PWM generator;
the proportional-integral controller is used for generating a reference vector by taking the difference value between the set load voltage and the actual load voltage as an error;
the digital phase-locked loop is used for detecting the voltage phase value of the power grid and selecting a target sector and an effective voltage vector corresponding to the target sector in 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain a reference vector;
wherein each sector comprises 6 effective voltage vectors and 3 zero voltage vectors;
and the PWM generator is used for generating PWM signals based on the driving of the reference vector, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter and outputting a target high-frequency voltage corresponding to the set load voltage.
4. A wireless power transfer system according to claim 1 wherein the three phase power input comprises:
a three-phase power input and input filter;
the three-phase power input is used for providing power for the wireless power transmission system;
the input filter is used for effectively filtering the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain the power signal of the specific frequency.
5. A wireless power transfer system according to claim 1, wherein the transmitting end comprises:
transmitting terminal compensation capacitor CTTransmitting end compensation inductance Lf1Transmitting end transmitting coil LT。
6. A wireless power transmission system according to claim 1, wherein said receiving end comprises:
receiving end compensation capacitor CRReceiving end compensation inductance Lf2Receiving end receiving coil LR。
7. A wireless power transfer system as claimed in claim 6, wherein the receiving end comprises:
and the diode rectifier bridge is used for stabilizing the direct-current voltage of the receiving end.
8. A wireless power transmission method, comprising:
providing an input voltage to the three-phase matrix converter using the three-phase AC input;
calculating and modulating a set load voltage and an actual load voltage after detecting the voltage phase value of the power grid by using the digital signal processor to obtain a PWM signal, and transmitting the PWM signal to the three-phase matrix converter;
receiving the PWM signal and the input voltage by using the three-phase matrix converter, controlling the on-off of the bidirectional switch in the three-phase matrix converter according to the PWM signal, and outputting high-frequency voltage;
exciting a transmitting end by using the high-frequency voltage to generate a high-frequency magnetic field;
and the high-frequency magnetic field acts on the receiving end, and the current is generated by coupling, so that wireless electric energy transmission is realized.
9. A method of wireless power transmission according to claim 8, wherein the three-phase matrix converter comprises:
and 6 bidirectional switches, wherein every two bidirectional switches are arranged on the same bridge arm of the three-phase matrix converter, and each bidirectional switch comprises two MOSFETs.
10. The method of claim 8, wherein the detecting the phase value of the grid voltage by the digital signal processor and then calculating and modulating the actual load voltage to obtain the PWM signal, and the transmitting the PWM signal to the three-phase matrix converter comprises:
the digital signal processor comprises a proportional-integral controller, a digital phase-locked loop and a PWM generator;
generating a reference vector by using the difference value of the set load voltage and the actual load voltage as an error by using the proportional-integral controller;
detecting the voltage phase value of the power grid by using the digital phase-locked loop, and selecting a target sector and an effective voltage vector corresponding to the target sector in 6 predefined sectors according to the phase value so as to synthesize the reference vector by using a space vector modulation method to obtain a reference vector;
and driving a PWM generator by using the reference vector to generate a PWM signal, controlling the on and off of 6 bidirectional switches in the three-phase matrix converter, and outputting a target high-frequency voltage corresponding to the set load voltage.
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| PCT/CN2021/143119 WO2023115630A1 (en) | 2021-12-22 | 2021-12-30 | Wireless power transmission system and method |
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| WO2023115630A1 (en) | 2023-06-29 |
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