Patent ID: 8084974
Filing Date: 2011-12-27
Classification: G01R,H02M,H02P

Abstract:
1. An inverter device comprising: a DC power source for supplying DC power; an inverter for converting the DC power into AC power, the inverter being constituted by a semiconductor switching element and a freewheeling diode connected in anti-parallel with the semiconductor switching element; a voltage detector for detecting phase voltages of the inverter, the voltage detector being connected between the inverter and a motor that is a driving control target; a pulse signal detection circuit for comparing a phase voltage detection value per one phase output from the voltage detector and a first reference voltage value, and for outputting a pulse signal obtained from a result of the comparing; a motor voltage detection circuit for detecting a line residual voltage or an induced voltage of the motor based on phase voltage detection values of two phases output from the voltage detector, and a phase detection circuit for detecting a line phase based on a comparison between the line residual voltage and a second reference voltage value.