CN-114678966-B - Control method and device of wireless charging system and wireless charging system

CN114678966BCN 114678966 BCN114678966 BCN 114678966BCN-114678966-B

Abstract

The invention provides a control method and device of a wireless charging system and the wireless charging system, wherein the method comprises the steps of setting the wireless charging system to work at a resonant frequency; the method comprises the steps of controlling Ubus voltage within a first preset voltage threshold according to an AC/DC module and a DC/DC module in a ground terminal unit, obtaining first voltage and first current of the ground terminal unit, setting a second voltage protection threshold and a second current protection threshold of a vehicle terminal unit according to the first voltage and the first current, obtaining the first voltage protection threshold and the first current protection threshold of the ground terminal unit, detecting the first voltage and the first current, judging whether the first voltage exceeds the first voltage protection threshold and/or whether the first current exceeds the first current protection threshold, obtaining a first judgment result and sending the first judgment result to a loop control module, and controlling a wireless charging system according to the first judgment result. The problem of wireless charging ground end and car end interaction time long, charging current/voltage control effect is poor is solved.

Inventors

WANG XIAOYUAN
JIANG RONGXUN
SU WEI
DAI KANGWEI

Assignees

北京新能源汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220221

Claims (8)

1. A control method of a wireless charging system, the method being applied to a wireless charging system, the system including a ground side unit, a vehicle side unit, a secondary side overvoltage/overcurrent protection module, a loop control module, and a battery, the method comprising: Setting a first MOS switch tube, a second MOS switch tube, a third MOS switch tube and a fourth MOS switch tube in the ground terminal unit as resonance points; Controlling the Ubus voltage to be within a first preset voltage threshold according to an AC/DC module and a DC/DC module in the ground terminal unit; Obtaining a first voltage and a first current of the ground terminal unit; setting a second voltage protection threshold and a second current protection threshold of the vehicle-end unit according to the first voltage and the first current, and simultaneously obtaining the first voltage protection threshold and the first current protection threshold of the ground-end unit; Detecting the first voltage and the first current, judging whether the first voltage exceeds the first voltage protection threshold value and/or whether the first current exceeds the first current protection threshold value, obtaining a first judgment result and sending the first judgment result to the loop control module; The loop control module controls the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube according to the first judging result to protect the wireless charging system; the formula for setting the second voltage protection threshold and the second current protection threshold of the vehicle-end unit according to the first voltage, the first current and the first mutual inductance is as follows: at the resonance frequency point When the method is used, the following steps are included: ; Wherein L1 is the self-inductance of the receiving coil; C1 is a compensation capacitor; M is a mutual inductance coefficient; U1 is the first voltage, and U2 is the second voltage; I1 is the first current and I2 is the second current.
2. The method of claim 1, wherein the loop control module controls the first MOS switch tube, the second MOS switch tube, the third MOS switch tube, and the fourth MOS switch tube according to the first determination result, to protect the wireless charging system, comprising: When the first judgment result is that the first voltage exceeds the first voltage protection threshold value and/or the first current exceeds the first current protection threshold value, the loop control module obtains first reminding information; And closing the third MOS switch tube and the fourth MOS switch tube according to the first reminding information, and opening the first MOS switch tube and the second MOS switch tube.
3. The method of claim 1, wherein the loop control module controls the first MOS switch tube, the second MOS switch tube, the third MOS switch tube, and the fourth MOS switch tube according to the first determination result, to protect the wireless charging system, comprising: when the first judgment result is that the first voltage exceeds the first voltage protection threshold value and/or the first current exceeds the first current protection threshold value, the loop control module obtains second reminding information; and closing the first MOS switch tube and the second MOS switch tube according to the second reminding information, and opening the third MOS switch tube and the fourth MOS switch tube.
4. The method of claim 1, wherein the setting the second voltage protection threshold and the second current protection threshold of the head end unit based on the first voltage and the first current while obtaining the first voltage protection threshold and the first current protection threshold of the ground end unit comprises: Obtaining a first mutual inductance coefficient according to the first voltage and the first current; setting a second voltage protection threshold and a second current protection threshold of the vehicle-end unit; And obtaining a first voltage protection threshold and a first current protection threshold of the ground terminal unit according to the second voltage protection threshold, the second current protection threshold and the first mutual inductance coefficient.
5. The method of claim 1, wherein the method further comprises: detecting the second current and the second voltage and sending the second current and the second voltage to the ground terminal unit through wireless communication; The ground terminal unit calculates according to the second current and the second voltage and outputs a control quantity; and the ground end unit adjusts the Ubus voltage of the ground end unit according to the control quantity.
6. A wireless charging system, the system comprising: a ground end unit for providing a high frequency alternating current; the vehicle end unit receives the high-frequency alternating current from the ground end unit and converts the high-frequency alternating current into direct current; The secondary overvoltage/overcurrent protection module is used for setting voltage protection thresholds and current protection thresholds of the vehicle end unit and the ground end unit according to the high-frequency alternating current, judging whether the voltage of the ground end unit exceeds the voltage protection threshold of the ground end unit and/or whether the current of the ground end unit exceeds the current protection threshold of the ground end unit, and obtaining a first judgment result; the loop control module is used for controlling the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube according to the first judging result so as to protect the wireless charging system; the battery receives the direct current converted and output by the vehicle end unit for charging; The loop control module controls the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube based on the method according to any one of claims 1 to 5 according to the first determination result of the secondary overvoltage/overcurrent protection module, so as to protect the wireless charging system.
7. A control device of a wireless charging system, comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the control method according to any one of claims 1 to 5 when executing the program.
8. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the control method according to any one of claims 1 to 5.

Description

Control method and device of wireless charging system and wireless charging system Technical Field The present invention relates to the field of wireless charging technologies, and in particular, to a method and an apparatus for controlling a wireless charging system, and a wireless charging system. Background The wireless charging technology is convenient to operate, has low equipment loss rate, is a novel charging technology, and is popular in the market. At present, part of electric automobiles also apply wireless charging technology. In the charging process of the electric automobile, interaction between the charging ground end and the automobile end is realized through a wireless communication technology, and charging current/voltage is controlled. However, the wireless communication technology has a certain data transmission interaction time, so the prior art has the technical problems of longer interaction time between the ground terminal and the vehicle terminal and poor charging current/voltage control effect. Disclosure of Invention The application provides a control method and device of a wireless charging system and the wireless charging system, which are used for solving the technical problems of long interaction time between a wireless charging ground terminal and a vehicle terminal and poor charging current/voltage control effect in the prior art. In order to solve the technical problems, the invention adopts the following technical scheme: The first aspect of the invention provides a control method of a wireless charging system, the method is applied to the wireless charging system, the system comprises a ground terminal unit, a vehicle terminal unit, a secondary overvoltage/overcurrent protection module, a loop control module and a battery, and the method comprises the steps of setting a first MOS switch tube, a second MOS switch tube, a third MOS switch tube and a fourth MOS switch tube in the ground terminal unit to be at resonance points; controlling the Ubus voltage to be within a first preset voltage threshold according to an AC/DC module and a DC/DC module in the ground terminal unit; the wireless charging system comprises a ground terminal unit, a loop control module, a first MOS switch tube, a second MOS switch tube, a third MOS switch tube, a fourth MOS switch tube, a wireless charging system, a first voltage and a first current of the ground terminal unit, setting a second voltage protection threshold and a second current protection threshold of the vehicle terminal unit according to the first voltage and the first current, simultaneously obtaining the first voltage protection threshold and the first current protection threshold of the ground terminal unit, detecting the first voltage and the first current, judging whether the first voltage exceeds the first voltage protection threshold and/or whether the first current exceeds the first current protection threshold, obtaining a first judgment result and sending the first judgment result to the loop control module, and controlling the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube according to the first judgment result. The second aspect of the invention provides a wireless charging system, which comprises a ground end unit, a vehicle end unit, a secondary overvoltage/overcurrent protection module, a battery and a loop control module, wherein the ground end unit is used for providing high-frequency alternating current, the vehicle end unit is used for receiving the high-frequency alternating current from the ground end unit and converting the high-frequency alternating current into direct current, the secondary overvoltage/overcurrent protection module is used for setting voltage protection thresholds and current protection thresholds of the vehicle end unit and the ground end unit according to the high-frequency alternating current, judging whether the voltage of the ground end unit exceeds the voltage protection threshold of the ground end unit and/or whether the current of the ground end unit exceeds the current protection threshold of the ground end unit or not, a first judgment result is obtained, and the loop control module is used for controlling the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube according to the first judgment result, protecting the wireless charging system and the battery is used for receiving and converting the direct current output by the vehicle end unit. In a third aspect the invention provides a control device for a wireless charging system, comprising a processor coupled to a memory for storing a program which, when executed by the processor, causes the device to perform the steps of the method as described in the first aspect. In a fourth aspect of the invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by