Multiple resonant converter apparatus and control method

摘要

A resonant converter apparatus includes a plurality of resonant converters connected in parallel, and a control module outputting a pulse width modulation (PWM) control signal to the resonant converters. The control module includes a voltage control loop and a circuit control loop. The voltage control loop compares the sensed output voltage with a predetermined reference voltage, and outputs a PWM control signal to one of the resonant converters so the output voltage of the one converter is equal to the predetermined reference voltage. The current control loop uses the sensed output current of the one converter as a reference current, compares the reference current with the sensed output current from each of the other resonant converters, generates a frequency adjusting variable, and calculates the individual PWM control signal for each of the other converters so the output currents of the plurality of converters are the same.

主权项

1. A resonant converter apparatus comprising:
a plurality of resonant converters connected in parallel; and a control module configured to output a pulse width modulation (PWM) control signal to the plurality of resonant converters, wherein: the control module comprises a voltage control loop and a current control loop; a voltage sensing end of the control module is configured to receive a sensed output voltage of the plurality of resonant converters; a current sensing end of the control module is configured to receive a sensed output current of each of the plurality of resonant converters; the voltage control loop of the control module is configured to compare the sensed output voltage with a predetermined reference voltage, and output a PWM control signal to one resonant converter of the plurality of resonant converters according to a voltage comparison result so that an output voltage of the one resonant converter is equal to the predetermined reference voltage; and the current control loop of the control module is configured to use the sensed output current of the one resonant converter as a reference current, compare the reference current with the sensed output current received from each of the plurality of resonant converters other than the one resonant converter, generate a frequency adjusting variable of the PWM control signal for each of the plurality of resonant converters other than the one resonant converter based on the current comparison result, and calculate the PWM control signal for each of the plurality of resonant converters other than the one resonant converter based on the PWM control signal provided to the one resonant converter and the frequency adjusting variable to adjust the output current of each of the plurality of resonant converters other than the one resonant converter to be equal to the output current of the one resonant converter.