Non-isolated dc fast charger for electrified vehicles

An electric vehicle charger comprising:

• a rectifier comprising a first number of power modules;
• a converter comprising a second number of power modules, wherein the second number is half of the first number;
• wherein a power module comprises:
• a first switch;
• a second switch;
• and
• an LC filter electrically coupled to the first and second switches, the LC filter comprising one or more inductors and one or more capacitors;
• a DC bus electrically coupled to the rectifier and the converter;
• and
• a DC ground electrically coupled to:
• a neutral point of one or more capacitors of the power modules of the rectifier;
• and
• a neutral point of one or more capacitors of the power modules of the converter.

A charger comprising:

• a first LC filter to smooth an AC voltage source;
• a three-phase rectifier electrically coupled to the LC filter;
• a DC bus, wherein a neutral point of the first LC filter is connected to a DC ground;
• a converter electrically coupled to the DC bus;
• a second LC filter to smooth a DC voltage provided by the converter, wherein a neutral point of the second LC filter is connected to the DC ground;
• and
• a controller configured to mitigate leakage currents by controlling a voltage of at least one capacitor in the LC filter;
• wherein the charger is symmetric across the DC bus.