Patent ID: 6967454

Claim:
An apparatus for monitoring performance of a power converter that has a first switch connecting a first voltage bus to an output terminal and a second switch connecting a second voltage bus to the output terminal, the apparatus comprising: a first pole current sensor located in series with the first switch and producing a first indication of a direction of electric current between the first voltage bus and the output terminal; a second pole current sensor located in series with the second switch and producing a second indication of a direction of electric current between the second voltage bus and the output terminal; an output current sensor operably coupled to produce a third indication of a direction of electric current in the output terminal; and a controller that produces a first conductivity command for the first switch and a second conductivity command for the second switch, and an indication of a fault condition in response to the first indication, the second indication, the third indication, the first conductivity command, and the second conductivity command.