Pulse width modulated resonant power conversion

摘要

A power converter including a resonant circuit is controlled by pulse width modulation (PWM) of a switching circuit to control current in the resonant circuit near the frequency of the resonant circuit (a null-immittance criterion) in order to control current and voltage at the output of the resonant circuit. Further control of voltage can be performed by PWM of a switching circuit at the output of the resonant circuit such that centers of the duty cycles of respective switches for the output of the resonant circuit are substantially synchronized and substantially symmetrical about centers of said duty cycles of respective switches at the input of the resonant circuit. Thus, operation of the converter is substantially simplified by using only PWM, a wide range of input and output voltages can be achieved and the converter circuit can be configured for bi-directional power transfer.

主权项

1. A power converter comprising
a first switching circuit having a plurality of switches, a second switching circuit having a plurality of switches, a connection between said first switching circuit and said second switching circuit, said connection including a resonant circuit, and a pulse width modulation circuit for providing driving pulses to drive said plurality of switches of said first switching circuit and said second switching circuit with pulses such that driving pulses of at least one of said first switching circuit and said second switching circuit are pulse width modulated and centers of driving pulses of said first switching circuit and said second switching circuit are synchronized at a substantially fixed frequency near a resonant frequency of said resonant circuit.