Patent ID: 8228700

Claim:
A power conversion device, comprising: a power module comprising an inverter circuit that comprises, for each phase, an upper arm switching element and a lower arm switching element; and a drive circuit board upon which are implemented, for each phase, an upper arm driver circuit that outputs a drive signal to the upper arm switching element and a lower arm driver circuit that outputs a drive signal to the lower arm switching element; wherein: the drive circuit board is made as a laminated board in which a plurality of conductor layers and a plurality of insulating layers are alternately laminated together, and comprises a first board edge portion to which control terminals for the upper arm switching elements are connected, a second board edge portion to which control terminals for the lower arm switching elements are connected, and a board region located between the first and second board edge portions; in the board region, along with an upper arm implementation region upon which the upper arm driver circuits are implemented and a lower arm implementation region upon which the lower arm driver circuits are implemented being formed for each phase, a low voltage system region is formed upon which are implemented signal transmission elements that transmit control signals to each of the driver circuits while electrically insulating the control signals; and signal wiring that transmits control signals from the signal transmission elements to the corresponding driver circuits is formed so as to pass under the lower arm driver circuits in a lower conductor layer than the conductor layer at which the lower arm driver circuits are implemented.