PRE-CHARGE OF FLYING CAPACITOR CONVERTERS

A pre-charge sequence for a flying capacitor converter of a wireless power system is disclosed. An example method includes determining that a ground assembly of the system is connected to an electric grid and is not receiving power. The ground assembly comprises (1) a first switch leg comprising first, second, third, and fourth switches connected in series between first and second voltage source terminals, (2) a flying capacitor connected at a first node between the first and second switches and at a second node between the third and fourth switches, and (3) a DC link capacitor. The method includes executing a flying capacitor pre-charge sequence comprising: switching on the first and fourth switches; determining that the flying capacitor has reached a threshold voltage; and in response, switching off the first and fourth switches.