CN114070023A - Method and system for synchronizing transmitting side and receiving side of wireless charging and discharging system - Google Patents
Method and system for synchronizing transmitting side and receiving side of wireless charging and discharging system Download PDFInfo
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- CN114070023A CN114070023A CN202111283967.1A CN202111283967A CN114070023A CN 114070023 A CN114070023 A CN 114070023A CN 202111283967 A CN202111283967 A CN 202111283967A CN 114070023 A CN114070023 A CN 114070023A
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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
- 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
- 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 method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system, which comprises the following steps: acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charging and discharging system; modulating the full-bridge current signal by the quadrature modulation signal; and calculating the phase relation between the transmitting side and the receiving side, and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation. The controller generates a modulation signal, the analog switch is utilized to modulate the sampled full-bridge output current, the modulated signal is sent to the controller after being filtered, the phase relation between the transmitting side and the receiving side is calculated, the phases of the receiving side and the transmitting side are adjusted through frequency conversion or delay control, an auxiliary coil is not required to be additionally added, the phase of a high-frequency signal is not required to be directly detected, errors caused by current harmonics are directly compensated, and the synchronization precision is improved.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a method and a system for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system.
Background
The wireless charging technology is widely applied to the fields of portable electronic equipment, medical implants, industrial automation, electric automobiles and the like. Because there is not connecting cable, compare in traditional contact charging, wireless charging has advantages such as safety, convenient, reliability, low maintenance. The bidirectional wireless charging technology is applied to the car networking technology, can realize the bidirectional energy flow between a power grid and an electric car, and plays roles in clipping peaks and filling valleys and stabilizing power grid fluctuation. The bidirectional wireless charging technology is applied to different devices and can realize mutual charging among the devices.
The wireless bidirectional charging and discharging system mainly has two control methods for realizing bidirectional energy flow. One is that the transmitting side works in an inversion mode and the receiving side works in an uncontrolled rectification mode. The method only needs to control the transmitting side of the system, and the control is simple. However, impedance matching between the transmitting side and the receiving side cannot be achieved, and optimal transmission efficiency cannot be obtained. Another method is to control the converters on the transmitting side and the receiving side simultaneously, which can realize impedance matching between the transmitting side and the receiving side and improve the transmission efficiency of the system, but the method needs to control the phase between the control signals on the transmitting side and the receiving side.
In order to control the phase of the control signal between the transmitting side and the receiving side, synchronization between the transmitting side and the receiving side needs to be achieved. The main synchronization methods at present are wireless communication, auxiliary coil addition, output current zero crossing point detection and the like. The wireless communication is adopted for synchronization, and the communication has the problems of unknown phase, uncontrollable phase and the like caused by delay. The method of adding an auxiliary coil requires precise and complicated sampling, and the synchronization accuracy is affected by circuit parameters. There may be an error in detecting the zero crossing point of the output current for synchronization under the influence of the circuit harmonic current.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a system for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system, including the following steps:
acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charging and discharging system;
modulating the full-bridge current signal by a quadrature modulation signal;
and calculating the phase relation between the transmitting side and the receiving side, and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation.
Further, the modulating the full-bridge current signal by the quadrature modulation signal includes:
directly outputting one path of the full-bridge current signal, and outputting the other path of the full-bridge current signal after inverting;
and modulating the quadrature modulation signal with the two paths of full-bridge current signals respectively.
Further, the modulating the quadrature modulation signal with the two full-bridge current signals respectively includes:
respectively sending the two paths of full-bridge current signals to the moving ends of a first single-pole double-throw analog switch of a D-axis modulation unit and a second single-pole double-throw analog switch of a Q-axis modulation unit;
respectively controlling the first single-pole double-throw analog switch and the second single-pole double-throw analog switch through the quadrature modulation signal;
and modulating the two paths of full-bridge current signals, and respectively filtering the modulated signals based on a first low-pass filter of the D-axis modulation unit and a second low-pass filter of the Q-axis modulation unit to obtain a D-axis output signal and a Q-axis output signal.
Further, after the modulating the full-bridge current signal by the quadrature modulation signal, the method further includes:
compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units;
each compensation unit comprises a single-pole double-throw analog switch, a low-pass filter and an analog amplification circuit which are sequentially connected, and the single-pole double-throw analog switch is controlled through the quadrature modulation signal.
Further, the compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units includes:
subtracting the output signals of the plurality of compensation units from the output signal of the Q axis to obtain a Q axis compensation signal;
and calculating the phase relation between the transmitting side and the receiving side according to the D-axis output signal and the Q-axis compensation signal.
Furthermore, the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N;
wherein the value of N is an odd number of 3 or more.
Accordingly, a second aspect of the embodiments of the present invention provides a wireless charging and discharging system transmitting side and receiving side synchronization system, including:
the signal acquisition module is used for acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charge-discharge system;
a signal modulation module for modulating the full-bridge current signal by a quadrature modulation signal;
and the phase control module is used for calculating the phase relation between the transmitting side and the receiving side and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation.
Further, the signal modulation module includes:
the signal processing unit is used for directly outputting the full-bridge current signal to one path and outputting the other path after inverting;
and the signal modulation unit is used for modulating the quadrature modulation signal and the two paths of full-bridge current signals respectively.
Further, the signal modulation unit includes:
the signal transmission subunit is used for respectively sending the two paths of full-bridge current signals to the moving ends of a first single-pole double-throw analog switch of the D-axis modulation unit and a second single-pole double-throw analog switch of the Q-axis modulation unit;
a signal control subunit for controlling the first single-pole double-throw analog switch and the second single-pole double-throw analog switch by the quadrature modulation signal, respectively;
and the signal modulation subunit is used for modulating the two paths of full-bridge current signals, and filtering the modulated signals respectively based on the first low-pass filter of the D-axis modulation unit and the second low-pass filter of the Q-axis modulation unit to obtain a D-axis output signal and a Q-axis output signal.
Further, the wireless charging and discharging system transmitting side and receiving side synchronization system further comprises:
a signal compensation module for compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units;
each compensation unit comprises a single-pole double-throw analog switch, a low-pass filter and an analog amplification circuit which are sequentially connected, and the single-pole double-throw analog switch is controlled through the quadrature modulation signal.
Furthermore, the signal compensation module subtracts the output signals of the Q-axis and the plurality of compensation units to obtain a Q-axis compensation signal;
and calculating the phase relation between the transmitting side and the receiving side according to the D-axis output signal and the Q-axis compensation signal.
Furthermore, the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N;
wherein the value of N is an odd number of 3 or more.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the controller generates a modulation signal, the analog switch is utilized to modulate the sampled full-bridge output current, the modulated signal is sent to the controller after being filtered, the phase relation between the transmitting side and the receiving side is calculated, the phases of the receiving side and the transmitting side are adjusted through frequency conversion or delay control, an auxiliary coil is not required to be additionally added, the phase of a high-frequency signal is not required to be directly detected, errors caused by current harmonics are directly compensated, and the synchronization precision is improved.
Drawings
Fig. 1 is a flowchart of a method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system according to an embodiment of the present invention;
fig. 3 is a block diagram of a transmitting side and a receiving side synchronization system of a wireless charging and discharging system according to an embodiment of the present invention;
FIG. 4 is a block diagram of a signal modulation module provided by an embodiment of the present invention;
fig. 5 is a block diagram of a signal modulation unit according to an embodiment of the present invention.
Reference numerals:
1. a current sensor; 2. an inverter circuit; 3-1, a single-pole double-throw analog switch of the D-axis modulation unit; 3-2, a single-pole double-throw analog switch of the Q-axis modulation unit; 3-3, a single-pole double-throw analog switch of the compensation unit 3; 3-N, a single-pole double-throw analog switch of the compensation unit N; 4-1, a low-pass filter circuit of the D-axis modulation unit; 4-2, a low-pass filter circuit of the Q-axis modulation unit; 4-3, a low pass filter circuit of the compensation unit 3; 4-N, a low pass filter circuit of the compensation unit N; 5-1, modulating signals of a D-axis modulating unit; 5-2, modulating signals of a Q-axis modulating unit; 5-3, the modulation signal of the compensation unit 3; 5-N, a modulation signal of a compensation unit N; 6-3, an analog amplifying circuit of the compensation unit 3; 6-N, analog amplifying circuit of compensation unit N; 7. a subtraction circuit; 8. a D-axis signal; 9. a Q-axis signal; 10. a controller; 11. a signal acquisition module; 12. a signal modulation module; 121. a signal processing unit; 122. a signal modulation unit; 1221. a signal transmission subunit; 1222. a signal control subunit; 1223. a signal modulation subunit; 13. a phase control module; 14. and a signal compensation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1 and fig. 2, a first aspect of the embodiments of the present invention provides a method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system, including the following steps:
and step S200, acquiring a full-bridge current signal of the transmitting side or the receiving side of the wireless charging and discharging system.
In step S400, the full-bridge current signal is modulated by the quadrature modulation signal.
Step S600, calculating the phase relation between the transmitting side and the receiving side, and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation.
Further, in step S400, modulating the full-bridge current signal by the quadrature modulation signal includes:
and step S410, directly outputting one path of the full-bridge current signal, and outputting the other path of the full-bridge current signal after inverting.
Step S420, the quadrature modulation signal is modulated with the two full-bridge current signals, respectively.
Further, in step S420, the modulating the quadrature modulation signal with the two full-bridge current signals respectively includes:
and step S421, respectively sending the two full-bridge current signals to the first single-pole double-throw analog switch of the D-axis modulation unit and the moving end of the second single-pole double-throw analog switch of the Q-axis modulation unit.
Step S422, the first single-pole double-throw analog switch and the second single-pole double-throw analog switch are respectively controlled by the quadrature modulation signal.
And step S423, modulating the two paths of full-bridge current signals, and filtering the modulated signals respectively based on the first low-pass filter of the D-axis modulation unit and the second low-pass filter of the Q-axis modulation unit to obtain a D-axis output signal and a Q-axis output signal.
Further, step S400, after modulating the full-bridge current signal by the quadrature modulation signal, further includes:
and S500, compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units.
Each compensation unit comprises a single-pole double-throw analog switch, a low-pass filter and an analog amplification circuit which are sequentially connected, and the single-pole double-throw analog switch is controlled through an orthogonal modulation signal.
Further, in step S500, compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units includes:
and step S510, subtracting the output signals of the Q-axis compensation units from the output signals of the plurality of compensation units to obtain a Q-axis compensation signal.
In step S600, the phase relationship between the transmitting side and the receiving side is calculated from the D-axis output signal and the Q-axis compensation signal.
Furthermore, the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N. Wherein the value of N is an odd number of 3 or more.
In the above technical solution, the current sensor 1 samples the full-bridge output current of the transmitting side or the receiving side, and the sampling signal is inverted by the inverter circuit 2. And the signals before phase reversal and the signals after phase reversal are respectively sent to two movable ends of single-pole double-throw analog switches 3-1 and 3-2 of the D-axis modulation unit and the Q-axis modulation unit, and the signals before phase reversal and the signals after phase reversal are simultaneously sent to two movable ends of single-pole double-throw analog switches 3-3 to 3-N of a plurality of compensation units.
The controller 10 sends out quadrature modulation signals 5-1 and 5-2 with 90-degree phase difference to respectively control the single-pole double-throw analog switches 3-1 and 3-2, the frequency of the quadrature modulation signals 5-1 and 5-2 is the same as the system rated switching frequency, and the duty ratio is 50%. The modulated signals are output through the immobile ends of the single-pole double-throw analog switches 3-1 and 3-2, the outputs are respectively connected with the low-pass filter circuits 4-1 and 4-2, and direct-current signals are obtained after filtering through the low-pass filter circuits.
Meanwhile, the controller 10 sends out a plurality of modulation signals 5-3 to 5-N with the same initial phase as 5-1, the frequency of the modulation signal 5-3 is 3 times of the switching frequency, and the frequency of the modulation signal 5-N is N times of the switching frequency. The value of N is odd, such as 3,5,7,9, etc. The modulation signals 5-3 to 5-N control the compensation units 3 to 3-N of the single-pole double-throw analog switches 3-3 to 3-N of the compensation unit N, and the modulated signals are output through the fixed ends of the single-pole double-throw analog switches 3-3 to 3-N. The outputs of the immobile ends of the single-pole double-throw analog switches 3-3 to 3-N are connected with low-pass filter circuits 4-3 to 4-N, and the outputs of the filter circuits are respectively connected with analog amplification circuits 6-3 to 6-N. The amplification factor of the analog amplification circuit 6-3 is 1/3, and the amplification factor of the analog amplification circuit 6-N is 1/N. The outputs of the analog amplification circuit outputs 6-3 to 6-N are subtracted by the subtraction circuit 7 and the output of the low-pass filter circuit 4-2 to obtain a Q-axis compensation signal 9. The controller 10 samples the D-axis output signal 8 and the Q-axis compensation signal 9 of the low-pass filter circuit 4-1 through the ADC, calculates the phases of the transmitting side and the receiving side, and adjusts the phases of the transmitting side and the receiving side through frequency conversion control or delay control.
Accordingly, referring to fig. 3, a second aspect of the embodiments of the present invention provides a wireless charging and discharging system transmitting side and receiving side synchronization system, including:
the signal acquisition module 11 is configured to acquire a full-bridge current signal on a transmitting side or a receiving side of the wireless charging and discharging system;
a signal modulation module 12 for modulating the full-bridge current signal by the quadrature modulation signal;
and a phase control module 13, configured to calculate a phase relationship between the transmitting side and the receiving side, and synchronize the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relationship.
Further, referring to fig. 4, the signal modulation module 12 includes:
the signal processing unit 121 is configured to directly output the full-bridge current signal in one path, and output the other path after inverting the full-bridge current signal;
and a signal modulation unit 122, configured to modulate the quadrature modulation signal with the two full-bridge current signals, respectively.
Further, referring to fig. 5, the signal modulation unit 122 includes:
the signal transmission subunit 1221 is configured to send the two full-bridge current signals to the moving ends of the first single-pole double-throw analog switch of the D-axis modulation unit and the second single-pole double-throw analog switch of the Q-axis modulation unit, respectively;
a signal control subunit 1222 for controlling the first single-pole double-throw analog switch and the second single-pole double-throw analog switch by quadrature modulation signals, respectively;
and the signal modulation subunit 1223 is configured to modulate the two paths of full-bridge current signals, and filter the modulated signals based on the first low-pass filter of the D-axis modulation unit and the second low-pass filter of the Q-axis modulation unit, respectively, to obtain a D-axis output signal and a Q-axis output signal.
Further, the wireless charging and discharging system transmitting side and receiving side synchronization system further comprises:
and a signal compensation module 14 for compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units. Each compensation unit comprises a single-pole double-throw analog switch, a low-pass filter and an analog amplification circuit which are sequentially connected, and the single-pole double-throw analog switch is controlled through an orthogonal modulation signal.
Further, the signal compensation module 14 subtracts the Q-axis output signal from the output signals of the plurality of compensation units to obtain a Q-axis compensation signal; and calculating the phase relation between the transmitting side and the receiving side according to the D-axis output signal and the Q-axis compensation signal.
Furthermore, the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N. Wherein the value of N is an odd number of 3 or more.
The embodiment of the invention aims to protect a method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system, which comprises the following steps: acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charging and discharging system; modulating the full-bridge current signal by the quadrature modulation signal; and calculating the phase relation between the transmitting side and the receiving side, and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation. The technical scheme has the following effects:
the controller generates a modulation signal, the analog switch is utilized to modulate the sampled full-bridge output current, the modulated signal is sent to the controller after being filtered, the phase relation between the transmitting side and the receiving side is calculated, the phases of the receiving side and the transmitting side are adjusted through frequency conversion or delay control, an auxiliary coil is not required to be additionally added, the phase of a high-frequency signal is not required to be directly detected, errors caused by current harmonics are directly compensated, and the synchronization precision is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (12)
1. A method for synchronizing a transmitting side and a receiving side of a wireless charging and discharging system is characterized by comprising the following steps:
acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charging and discharging system;
modulating the full-bridge current signal by a quadrature modulation signal;
and calculating the phase relation between the transmitting side and the receiving side, and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation.
2. The wireless charging and discharging system transmitting side and receiving side synchronization method according to claim 1, wherein the modulating the full-bridge current signal by the quadrature modulation signal comprises:
directly outputting one path of the full-bridge current signal, and outputting the other path of the full-bridge current signal after inverting;
and modulating the quadrature modulation signal with the two paths of full-bridge current signals respectively.
3. The wireless charging and discharging system transmitting side and receiving side synchronization method according to claim 2, wherein the modulating the quadrature modulation signal with the two full-bridge current signals respectively comprises:
respectively sending the two paths of full-bridge current signals to the moving ends of a first single-pole double-throw analog switch of a D-axis modulation unit and a second single-pole double-throw analog switch of a Q-axis modulation unit;
respectively controlling the first single-pole double-throw analog switch and the second single-pole double-throw analog switch through the quadrature modulation signal;
and modulating the two paths of full-bridge current signals, and respectively filtering the modulated signals based on a first low-pass filter of the D-axis modulation unit and a second low-pass filter of the Q-axis modulation unit to obtain a D-axis output signal and a Q-axis output signal.
4. The wireless charging and discharging system transmitting side and receiving side synchronization method according to claim 3, wherein after modulating the full-bridge current signal by the quadrature modulation signal, further comprising:
compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units;
wherein each of the compensation units comprises: the single-pole double-throw analog switch, the low-pass filter and the analog amplification circuit are sequentially connected, and the single-pole double-throw analog switch is controlled through the quadrature modulation signal.
5. The wireless charging and discharging system transmitting side and receiving side synchronization method according to claim 4, wherein the compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units comprises:
subtracting the output signals of the plurality of compensation units from the output signal of the Q axis to obtain a Q axis compensation signal;
and calculating the phase relation between the transmitting side and the receiving side according to the D-axis output signal and the Q-axis compensation signal.
6. The wireless charge-discharge system transmission-side and reception-side synchronization method according to claim 4,
the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N;
wherein the value of N is an odd number of 3 or more.
7. A wireless charging and discharging system transmitting side and receiving side synchronous system is characterized by comprising:
the signal acquisition module is used for acquiring a full-bridge current signal of a transmitting side or a receiving side of the wireless charge-discharge system;
a signal modulation module for modulating the full-bridge current signal by a quadrature modulation signal;
and the phase control module is used for calculating the phase relation between the transmitting side and the receiving side and synchronizing the phases of the transmitting side and the receiving side through frequency conversion control or delay control according to the phase relation.
8. The wireless charge-discharge system transmission-side and reception-side synchronization system according to claim 7, wherein the signal modulation module includes:
the signal processing unit is used for directly outputting the full-bridge current signal to one path and outputting the other path after inverting;
and the signal modulation unit is used for modulating the quadrature modulation signal and the two paths of full-bridge current signals respectively.
9. The wireless charge-discharge system transmission-side and reception-side synchronization system according to claim 8, wherein the signal modulation unit includes:
the signal transmission subunit is used for respectively sending the two paths of full-bridge current signals to the moving ends of a first single-pole double-throw analog switch of the D-axis modulation unit and a second single-pole double-throw analog switch of the Q-axis modulation unit;
a signal control subunit for controlling the first single-pole double-throw analog switch and the second single-pole double-throw analog switch by the quadrature modulation signal, respectively;
and the signal modulation subunit is used for modulating the two paths of full-bridge current signals, and filtering the modulated signals respectively based on the first low-pass filter of the D-axis modulation unit and the second low-pass filter of the Q-axis modulation unit to obtain a D-axis output signal and a Q-axis output signal.
10. The wireless charge-discharge system transmission-side and reception-side synchronization system according to claim 9, characterized by further comprising:
a signal compensation module for compensating the output signal of the Q-axis modulation unit based on a plurality of compensation units;
wherein each of the compensation units comprises: the single-pole double-throw analog switch, the low-pass filter and the analog amplification circuit are sequentially connected, and the single-pole double-throw analog switch is controlled through the quadrature modulation signal.
11. The wireless charge-discharge system transmission-side and reception-side synchronization system according to claim 10,
the signal compensation module subtracts the Q-axis output signal from the output signals of the plurality of compensation units to obtain a Q-axis compensation signal;
and calculating the phase relation between the transmitting side and the receiving side according to the D-axis output signal and the Q-axis compensation signal.
12. The wireless charge-discharge system transmission-side and reception-side synchronization system according to claim 10,
the modulation signal frequency of the compensation unit N is N times of the switching frequency, and the amplification factor of the analog amplification circuit of the compensation unit N is 1/N;
wherein the value of N is an odd number of 3 or more.
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