Isolated DC/DC converter and power electronics system

A power electronics system, comprising:

• a power switch device;
• a pulldown switch device configured to turn off the power switch device when the pulldown switch device is on;
• a flyback converter configured to drive a gate of the power switch device;
• and
• an isolated DC/DC converter comprising:
• a transformer having a primary side and a secondary side;
• a rectifier coupled between the secondary side of the transformer and a gate of the pulldown switch device;
• an inverter configured to change a DC input voltage (Vin) to an AC current for energizing the primary side of the transformer;
• a capacitor in series with the primary side of the transformer;
• and
• a controller configured to operate the inverter in a first mode such that the capacitor pre-charges to |Vin| before the controller receives a turn ON command for the pulldown switch device, the capacitor charges to X*|Vin| during a first part of a first switching cycle after the controller receives the turn ON command where X>1, and the capacitor voltage resonates with a magnetizing inductance of the primary side of the transformer during a second part of the first switching cycle.