Patent ID: 9455569
Filing Date: 2016-09-27
CPC Classification: G01R,H02H,H02M

Claim Text:
1. A method for an electrical circuit comprising: controlling a power converter having (i) a first series connection including at least two switches connected in series with one another, and connected in parallel with a second series connection including at least two switches connected in series with one another, and (ii) each having a potential electrically connected to the switches at an AC voltage-sided connection between the switches, wherein the power converter is connected in parallel with a set of capacitors connected in series with one another, the set of capacitors being electrically connected on opposite sides of a non-neutral connection point; measuring, when the potential at the AC voltage-sided connections between the switches changes from a first value to a second value during correspondingly switching of a respective switch from each of the at least two switches of the first series connection and the second series connection, a change in voltage in a measuring resistor from a first voltage to a second voltage, the measuring resistor being electrically connected between the non-neutral connection point and a ground; and determining a ground fault exists within the electrical circuit when the second voltage is a residual voltage established in a stationary reference time that has a value not equal to zero.