Patent ID: 7615952
Filing Date: 2009-11-10
Classification: H02M,H02P

Abstract:
1. A motor-driving device comprising: an inverter that drives a three-phase motor; a driver that amplifies a driving signal and sends an amplified driving signal to the inverter; a first current-protecting section that detects current to be fed into the inverter by an external resister connected to a bus line of the inverter, and shuts off output of the driver and outputs a first warning if the detected current value exceeds a predetermined first reference value; a second current-protecting section that outputs a second warning if the detected current value exceeds a predetermined second reference value that is smaller than the first reference value; and a driving-signal generator that generates the driving signal, wherein, 1)when the driving-signal generator receives the first warning from the first current-protecting section, the driving-signal generator stops generating the driving signal and remains to stop generating the driving signal even after the driving-signal generator no longer receives the first warning, 2) when the driving-signal generator receives the second warning from the second current-protecting section, the driving-signal generator stops generating the driving signals, however, the driving-signal generator resumes output of the driving signals at a point in time when no longer receiving the second warning, and wherein the first current-protecting section and the second current-protecting section work independently.