Patent ID: 8154890
Filing Date: 2012-04-10
Classification: H02M

Abstract:
1. An inverter apparatus that converts a direct-current power of a capacitor that is charged via a rectifier circuit connected to a first alternate-current power system into an alternate-current power, and supplies the alternate-current power to a second alternate-current power system, the inverter apparatus comprising: a discharge circuit that discharges a charge from the capacitor; a control circuit that controls at least one of frequency and amplitude of the inverter output voltage; a trigger circuit that outputs a discharge command signal for causing the discharge circuit to discharge the charge from the capacitor; a first voltage-sag detection circuit that detects a voltage sag in the first alternate-current power system, and outputs a voltage-sag signal to the control circuit; a control power circuit that receives a power from either one of the first alternate-current power system and the capacitor, and supplies a power to the control circuit; and a second voltage-sag detection circuit that detects a voltage sag in the control power circuit, wherein when the second voltage-sag detection circuit detects a voltage sag of the control power circuit below a predetermined value, the trigger circuit generates the discharge command signal.