METHOD OF FEEDBACK COMMANDING A MONOPHASE RESONANT CONVERTER, A RELATED MONOPHASE RESONANT CONVERTER AND A POLYPHASE RESONANT CONVERTER

摘要

A resonant converter includes a primary switching circuit having a primary winding and a primary switching stage configured to drive the primary winding; a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, a resonance capacitor connected in parallel to the secondary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the resonance capacitor; a rectification stage connected in parallel with the resonance capacitor, and having first and second switches coupled to form a half-bridge; and a feedback command circuit. The command circuit is configured to receive feedback signals representing an output voltage and an output current at the output terminal of the resonant converter, receive voltages at the terminals of the resonance capacitor, and turn on/off, independently with respect to each other, the switches of the rectification stage and the primary switching stage.

主权项

1. A method of feedback commanding a resonant converter, comprising:
short-circuiting a primary switching stage and turning off first and second switches of a secondary rectification stage, the resonant converter including:
a primary switching circuit having a primary winding and the primary full-bridge switching stage which is configured to drive said primary winding, and a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the secondary winding; energizing the primary switching circuit with a positive half-wave, while keeping on the switches of the secondary rectification stage and monitoring a current flowing through said first switch; turning off the first switch and monitoring a voltage at the first switch, in response to detecting a zero cross condition of the current flowing through said first switch; carrying out one of the two following operations:
before the voltage at the first switch nullifies, short-circuiting the primary switching stage, orafter the voltage at the first switch has nullified, energizing the primary switching circuit with a positive half-wave while keeping on the switches of the secondary rectification stage; turning on the first and second switches; energizing the primary circuit with a negative half-wave, while keeping on the switches of the secondary rectification stage and monitoring a current flowing through said second switch; turning off the second switch and monitoring a voltage at the second switch, in response to detecting a zero cross condition of the current flowing through said second switch; and carrying out one of the two following operations:
before the voltage at the second switch nullifies, short-circuiting the primary switching stage, orafter the voltage at the second switch has nullified, energizing the primary switching circuit with a negative half-wave while keeping on the switches of the secondary rectification stage.