Receive end and transmit end of wireless charging system, method, electrical terminal, and system

A receive end control method used in a receive end of a wireless charging system, wherein the receive end comprises a receive coil, a receive end compensation circuit, a rectifier, and a controller, wherein:

• the receive coil is configured to receive an alternating magnetic field and output an alternating current;
• the receive end compensation circuit is connected between the receive coil and the rectifier, wherein the receive end compensation circuit is configured to:
• compensate the alternating current that is output by the receive coil;
• and
• output a compensated alternating current to the rectifier;
• the receive end compensation circuit and the receive coil form a receive end compensation network, wherein the receive end compensation network comprises a first branch, a second branch, and a third branch, wherein the first branch comprises the receive coil, wherein both the first branch and the second branch are inductive branches, wherein a reactance of the second branch is greater than that of the first branch, wherein the first branch is connected to a first input end of the rectifier through the second branch, wherein the third branch is a capacitive branch, wherein a first end of the third branch is connected to a common end of the first branch and the second branch, and wherein a second end of the third branch is connected to a second input end of the rectifier;
• the rectifier comprises controllable switching transistors, wherein the rectifier is configured to rectify the alternating current to a direct current;
• and
• the control method comprises:
• adjusting a phase difference between a first bridge arm and a second bridge arm of the rectifier;
• and
• adjusting a phase-shift angle between a bridge arm voltage and a fundamental component of an input current of the rectifier, wherein zero-voltage switching is implemented for the controllable switching transistors of the rectifier.

A wireless charging system, comprising a transmit end and a receive end, wherein:

• the transmit end comprises an inverter, a transmit end compensation circuit, and a transmit coil, wherein:
• the inverter is configured to convert, to an alternating current, a direct current that is output by a direct current power supply;
• the transmit end compensation circuit is configured to:
• compensate the alternating current, and output a compensated alternating current to the transmit coil;
• the transmit coil is configured to transmit the alternating current in a form of an alternating magnetic field;
• and
• the transmit coil and the transmit coil form a transmit end LCL compensation network;
• and
• the receive end comprises a receive coil, a receive end compensation circuit, a rectifier, and a controller, wherein:
• the receive coil is configured to receive an alternating magnetic field and output an alternating current;
• the receive end compensation circuit is connected between the receive coil and the rectifier, wherein the receive end compensation circuit is configured to:
• compensate the alternating current that is output by the receive coil;
• and
• output a compensated alternating current to the rectifier;
• the receive end compensation circuit and the receive coil form a receive end compensation network, wherein the receive end compensation network comprises a first branch, a second branch, and a third branch, wherein the first branch comprises the receive coil, wherein both the first branch and the second branch are inductive branches, wherein a reactance of the second branch is greater than that of the first branch, wherein the first branch is connected to a first input end of the rectifier through the second branch, wherein the third branch is a capacitive branch, wherein a first end of the third branch is connected to a common end of the first branch and the second branch, and wherein a second end of the third branch is connected to a second input end of the rectifier;
• the rectifier comprises controllable switching transistors, wherein the rectifier is configured to rectify the alternating current to a direct current;
• and
• the controller is configured to:
• adjust a phase difference between a first bridge arm and a second bridge arm of the rectifier;
• and
• adjust a phase-shift angle between a bridge arm voltage of the rectifier and a fundamental component of an input current of the rectifier, wherein zero-voltage switching is implemented for the controllable switching transistors of the rectifier.