DC-AC converter with protection circuit

摘要

A power conversion device includes: an inverter (103) that converts a DC current supplied from a DC power source (101) to an AC current by engaging a plurality of switching elements (3a-3c), which constitute an upper arm, and a plurality of switching elements (3d-3f), which constitute a lower arm, in switching operation; a control unit (105) that includes a signal generation unit that generates a switching signal carrying a command for execution of the switching operation in correspondence to each of the plurality of switching elements (3a-3c) constituting the upper arm and the plurality of switching elements (3d-3f) constituting the lower arm, and outputs the switching signal thus generated as a control signal; and a drive unit (109) that individually drives each of the switching elements (3a-3f) based upon the corresponding control signals. The control unit (105) includes a plurality of protection circuits disposed in series on a control signal line extending between the signal generation unit and the drive unit, with each of the protection circuits outputting a control signal having been input thereto when a protective operation is not executed but outputting a control signal for setting the corresponding switching element either in a cut-off state or in an electrically continuous state in place of the control signal input thereto when the protective operation is executed.