Patent ID: 9240736
Filing Date: 2016-01-19
CPC Classification: H02M,H02P,Y02B

Claim Text:
1. A power converting device comprising: one or more backflow preventing elements that prevent electric current from flowing backward from a load side toward a power supply; a commutating unit for performing a commutation operation for causing electric current to flow toward a different path that is connected in parallel with the one or more backflow preventing elements; a malfunction detector for detecting a malfunction of the commutating unit; and a controller configured to control the commutating unit to perform commutation operation just before a recovery current flows through the backflow preventing element from the load side to the power supply and to perform operation control related to protection of the commutating unit on a basis of detection by the malfunction detector, wherein the commutating unit includes a commutation rectifying element that rectifies the electric current flowing through the different path, a transformer that performs the commutation operation by applying voltage based on voltage related to a primary winding to a secondary winding on the different path, and a transformer driving unit that controls excitation current caused by application of voltage to the primary winding of the transformer.