Device and method for implementing ZVS soft switch in wireless power transmission system based on frequency tracking

Abstract

The invention discloses a device and a method for realizing a ZVC (Zero Voltage Switching) soft switch based on frequency tracking. The method comprises a DC (Direct Current) voltage source, an inverter, a coupler, a rectifier, a load, a current detection circuit, an improved SOGI-PLL (Second-Order Generalized Integrator-Phase Locked Loop) and a PWM (Pulse-Width Modulation) driving module, wherein the DC voltage source, the coupler and the rectifier are connected with the load, the current output end of the inverter is connected with the signal input end of the improved SOGI-PLL, the signal output end of the improved SOGI-PLL is connected with the PWM-driven control signal input end, and the PWM-driven control signal output end is connected with a switch device of a full bridge inverter. According to the method provided by the invention, a direct phase control method and a dead zone angle modulation method based on the output phase of a phase-locked loop can be directly introduced, the operation of a wireless power transmission system is in a quasi-resonance state by precisely adjusting the phase difference of the system and the angle of the dead zone, the phase lag matching problem of the time of the dead zone and the resonance current can be solved, and the operation of the ZVS soft switch can be realized.

Description

technical field [0001] The invention relates to the technical field of soft switching of a wireless power transmission system, in particular to a device and method for implementing ZVS soft switching of a wireless power transmission system based on frequency tracking. Background technique [0002] In the coupled resonant wireless power transmission system, the bridge inverter works under high frequency conditions. In order to reduce the loss of switching devices and solve the problem of shoot-through, a dead time needs to be inserted between the driving signals of the upper and lower switching devices of the same bridge arm, and the system The dead time introduced in must be matched with the resonant current phase lag control; in addition, the detuning phenomenon caused by the change of load and other parameters will reduce the system transmission efficiency and power, so the soft switching operation and frequency tracking become the key to wireless power transmission. The p...

AI Technical Summary

Problems solved by technology

[0002] In the coupled resonant wireless power transmission system, the bridge inverter works under high frequency conditions. In order to reduce the loss of switching devices and solve the problem of shoot-through, a dead time needs to be inserted between the driving signals of the upper and lower switching devices of the same bridge arm, and the system The dead time introduced in must be matched with the phase lag control of the resonant current; in addition, the detuning phenomenon caused by the change of parameters such as load will reduce the transmission efficiency and power of the system, so the soft switching operation and frequency tracking become the key to wireless power transmission. Problems that the system needs to solve urgently

Images