Over voltage protection for a wireless power transfer system

A wireless power transfer system comprising:

• a first converting unit configured to convert a first DC voltage of an input power to an AC voltage;
• a contactless power transfer unit communicatively coupled to the first converting unit and configured to receive the input power having the AC voltage from the first converting unit and transmit the input power having the AC voltage;
• a second converting unit communicatively coupled to the contactless power transfer unit and configured to receive the input power having the AC voltage from the contactless power transfer unit, convert the AC voltage of the input power to a second DC voltage, and transmit the input power having the second DC voltage to an electric load;
• and
• a switching unit comprising:
• a first switch electrically coupled in parallel to a first diode in a first branch of the second converting unit;
• a second switch electrically coupled in parallel to a second diode in a second branch of the second converting unit;
• and
• a controller electrically coupled to the first switch and the second switch and configured to activate the first switch and the second switch to decouple the electric load from the contactless power transfer unit if the second DC voltage across the electric load is greater than a first threshold value.