Control of a Zero-Voltage Switching Isolated Series-Resonant Power Circuit for Direct 3-phase AC to DC Conversion

A novel control method is presented for a fully zero-voltage switching series-resonant isolated 3-phase AC to DC converter. The control is derived from first principles such as energy and charge conservation. The approach results in operation with a high power factor at the AC grid side and is beneficial in terms of EMI due to soft switching and low dv/dt across the switches even when extremely fast WBG devices such as SiC or GaN are used.