Patent ID: 7839665
Filing Date: 2010-11-23
Classification: H02H,H02M

Abstract:
1. A system interconnection inverter comprising: a step-up converter that steps up DC power; an inverter that inverts an output of the step-up converter to AC power; a pair of serially connected capacitors connected to a pair of DC buses that connects respective input terminals of the DC power to the step-up converter; a short-circuit current-interrupting diode with a cathode connected to an input terminal of a negative bus constituting the pair of DC buses; a semiconductor switch connected to an anode of the short-circuit current-interrupting diode; a semiconductor switch drive circuit that drives the semiconductor switch; a power capacitor for the semiconductor switch drive circuit that supplies operation power to the semiconductor switch drive circuit; a semiconductor switch-off circuit that discharges the power capacitor for the semiconductor switch drive circuit when negative power is applied such that electric current flows from a cathode toward an anode of the input terminal; and a control circuit that controls the semiconductor switch drive circuit.