Intelligent current analysis for resonant converters

摘要

A new method of extracting information from a current waveform for the purpose of controlling a resonant converter is presented. The method comprises the step of sampling the converter waveform exactly three times in half a period of the converter waveform or sampling the converter waveform exactly at three different positions in a sequence on different periods of the converter waveform and the step of extracting waveform information to produce a fundamental component and a triangular component of the converter waveform. The information could also be used for the purpose of predicting the inductance and load of a circuit to indicate alignment in a inductive charging system.

主权项

1. A method of acquiring and analyzing a converter waveform of a half-bridge converter having a switching frequency range, comprising sampling the converter waveform at an output of the half-bridge converter exactly 3 times in half a period of the converter waveform or sampling the converter waveform exactly at 3 different positions in a sequence on different periods of the converter waveform and extracting current information of the waveform to produce a fundamental component and a triangular component of the converter waveform, wherein the extracted current information is used to determine a reactive current and a resistive current in the half-bridge converter, and wherein the switching frequency range of the half-bridge converter is controlled dynamically based on the determined reactive and resistive currents.