Method for calculating equivalent impedance of rectifier bridge load of wireless charging system

Abstract

The invention discloses a method for calculating equivalent impedance of rectifier bridge load of a wireless charging system. The method comprises the following steps of (A) building a state space model comprising a wireless charging system rectifier bridge, a filter capacitor of the rectifier bridge, a rectifier bridge input inductor and electric equipment; (B) calculating a phase difference between a zero crossing point of previous voltage of the rectifier bridge input inductor and the zero crossing point of input voltage of the rectifier bridge and the filter capacitor of the rectifier bridge and output equivalent DC voltage of the rectifier bridge and the filter capacitor of the rectifier bridge; (C) obtaining an input variable and an initial value of a state variable of the state space model built in the step (A); (D) calculating a complete response of the state space model to obtain time domain expressions of input voltage and input current of the rectifier bridge and the filtercapacitor of the rectifier bridge; and (E) obtaining frequency domain expressions of the input voltage and input current of the rectifier bridge and the filter capacitor of the rectifier bridge, thereby calculating equivalent series resistance and inductance of the rectifier bridge load of the wireless charging system.

Description

technical field [0001] The invention relates to a method for calculating the equivalent impedance of a rectifier bridge load in a wireless charging system. Background technique [0002] Wireless charging system has received more and more attention due to its advantages of less space, no wire connection, safety and convenience. In the wireless charging system, the rectifier bridge is used to convert high-frequency alternating current into direct current, so as to charge the battery in the electric device. Patent CN 106451701 A "wireless charging circuit and device" proposes a wireless charging device including an induction signal rectification and filtering circuit and a DC voltage stabilizing circuit. Patent CN 105322817 A "Single-stage rectification and regulation for wireless charging system" uses a full-wave rectifier to regulate the charging voltage through feedback control and other methods. Patent CN105703450 A "Wireless Charging Device Based on Low-Frequency PWM Rec...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing technology cannot simply and effectively calculate the equivalent impedance of the rectifier bridge load in the wireless charging system, and propose a calculation method for the equivalent impedance of the rectifier bridge load in the wireless charging system

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