Resonant converter using variably delayed output switching

摘要

A resonant converter including: a resonant tank, a switching circuit that connects the resonant tank to a power supply according to a first switching sequence, a synchronous rectifier circuit that supplies power to an output, wherein the rectifier circuit is switched according to a second switching sequence, and a phase delay module arranged to delay the second switching sequence with respect to the first switching sequence to achieve a desired power output, and a method of controlling the same.

主权项

1. A resonant converter including:
a resonant tank; a switching circuit that connects the resonant tank to a power supply according to a first switching sequence; a synchronous rectifier circuit that supplies power to an output; wherein the rectifier circuit is switched according to a second switching sequence; and a phase delay module arranged to delay the second switching sequence with respect to the first switching sequence by a variable phase delay to achieve a desired power output, said phase delay module configured to use feedback from the output to develop an error signal based on a difference between a nominal value of a voltage at the output and an actual value of the voltage at the output, said error signal having a characteristic that varies in response to a first change in the actual value of the voltage at the output to thereby cause a change in the variable phase delay and a corresponding second change in the actual value of the voltage at the output that results from the change in the variable phase delay; wherein the second switching sequence is a phase delayed version of the first switching sequence and wherein a duty cycle of the first switching sequence is equivalent to a duty cycle of the second switching sequence.