Medium voltage inverter system

摘要

A medium voltage inverter system is provided. The inverter system includes a controller configured to short-circuit the output terminal of the inverter unit when failure occurs, a supply unit configured to supply an electric power to the controller, and an auxiliary rectifying unit configured to rectify the AC voltage provided through the input terminal and to supply the rectified AC voltage to the supply unit.

主权项

1. A medium voltage inverter system, the system comprising:
a first rectifying unit configured to rectify an Alternating Current (AC) voltage provided through an input terminal to a DC voltage; a smoothing unit configured to smooth the DC voltage rectified by the first rectifying unit, the smoothing unit including a capacitor; an inverter unit configured to convert the DC voltage smoothed by the smoothing unit to a predetermined AC voltage and to output the AC voltage to a motor through an output terminal; a controller configured to short-circuit the output terminal of the inverter unit when failure occurs; a supply unit configured to supply electrical power to the controller; an auxiliary rectifying unit configured to rectify the AC voltage provided through the input terminal and to supply the rectified AC voltage to the supply unit; and an initial charging unit configured to charge the capacitor of the smoothing unit during an initial driving, wherein the supply unit is further configured to: receive a voltage from the auxiliary rectifying unit during the initial driving; receive a voltage from the smoothing unit during a normal operation as a predetermined initial charging time elapses; and receive a voltage from the auxiliary rectifying unit in response to potential difference while the smoothing unit discharges during an abnormal operation.