Method for controlling a charging device on board an electric or hybrid vehicle

A method for controlling a battery-charging device for a motor vehicle, the charging device comprising a rectifier stage performing a power factor correction function, including three phase connections able to be connected at the input of a single-phase or three-phase electrical power supply grid each by a serial inductance coil, and a DC-DC converter stage connected between the rectifier stage and a battery, the rectifier stage being a three-phase Vienna rectifier comprising a three-phase diode bridge and three switching arms integrated into the diode bridge, each switching arm comprising a serial assembly of a high switch able to be controlled when the current of the grid is positive and a low switch able to be controlled when the current of the grid is negative, the switching arms being interconnected at a midpoint to which a first and second bus capacitor are connected at the output of the rectifier stag, the DC-DC converter stage comprising first and second LLC resonant converters connected at the input respectively to the first and second power supply bus capacitors by first and second power supply buses and, at the output, to the battery,

• the method being of the type according to which the current is regulated at the input of the charging device using the three-phase Vienna rectifier, each switching arm being controlled using pulse width modulation control signals, the switching duty factor of which is determined based on the regulation of the input current,
• the method comprising powering the charging device by a single phase and regulating the voltage of the first and second power supply buses independently using the first and second LLC resonant converters so as to provide a fixed regulated voltage on each of the power supply buses.