Patent ID: 7839663

Claim:
A power converter of packaged type comprising a main circuit board in which two sets of power converter circuits each including a plurality of bridge-connected semiconductor switching devices are connected to each other through a DC circuit, a controller board in which a controller for controlling said plurality of semiconductor switching devices for said two sets of power converter circuits is formed and a package in which said main circuit board is provided and on which said controller board is placed to connect therebetween, said package including two sets of AC terminals connected to said two sets of power converter circuits, respectively, an external terminal for a smoothing condenser connected in parallel to said DC circuit and an external terminal connected to said controller, all said terminals being disposed at periphery of said package, said main circuit board including at least two current detectors for detecting a DC current flowing through said external terminal for said smoothing condenser and DC currents in said power converter circuits, wherein said controller includes decision means for deciding an AC terminal connected to an AC power supply on the basis of a detected current of said at least one current detector and means for controlling to operate said power converter circuit connected to said AC power supply as a converter and to operate the other power converter circuit as an inverter on the basis of decision result of said decision means.