Patent ID: 11870335
Assignee: BEIJING INSTITUTE OF TECHNOLOGY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A wireless power transfer (WPT) system regulation method for implementing zero voltage switching (ZVS) in a wide power range, comprising:
determining, according to a topology structure of a WPT system and based on a linear state equation, a phase-shift angle boundary and a switching frequency boundary of an inverter that meet ZVS, wherein the WPT system is an LCC-LCC compensation topology structure;
fixing a switching frequency at a resonance frequency of the WPT system, and determining, in a phase-shift manner, a phase-shift range and a corresponding first voltage output range for implementing ZVS;
determining a frequency variation range of a frequency modulation method based on the resonance frequency of the WPT system;
determining an optimal switching frequency based on corresponding switching frequencies and phase-shift angles that meet ZVS at different expected output voltages of the WPT system;
determining, based on the phase-shift range for implementing ZVS, a second voltage output range for implementing ZVS at the optimal switching frequency; and
regulating the WPT system by using different regulation methods according to a relationship between a reference voltage of the WPT system and the first voltage output range and a relationship between the reference voltage and the second voltage output range, wherein the regulation methods comprise a first regulation method, a second regulation method, and a third regulation method,
wherein the first regulation method comprises fixing the switching frequency at the resonance frequency of the WPT system, and regulating the WPT system by using a phase-shift method,
wherein the second regulation method comprises fixing a phase angle at a maximum phase angle in the phase-shift range for implementing ZVS, and regulating the WPT system by using a frequency modulation method,
wherein the third regulation method comprises fixing the switching frequency at the optimal switching frequency, and regulating the WPT system by using a phase-shift method, and
wherein when the reference voltage of the WPT system is in a range [Up, Umax], regulating the WPT system by using the first regulation method; when the reference voltage of the WPT system is in a range [UH, UP], regulating the WPT system by using the second regulation method; when the reference voltage of the WPT system is in a range [UL, UH], regulating the WPT system by using the third regulation method; and when the reference voltage of the WPT system is in a (0, UL) or (Umax, ∞), , regulating the WPT system by using the first regulation method, wherein the first voltage output range is [Up, Umax], and the second voltage output range is [UL, UH].