US 7,615,952 B2
Electric motor driving device, and air conditioner using the same
Kazuhiro Harada, Shiga (Japan); Chisumi Harada, legal representative
Assigned to Panasonic Corporation, Osaka (Japan)
Appl. No. 11/574,016
PCT Filed Aug. 24, 2005, PCT No. PCT/JP2005/015312
§ 371(c)(1), (2), (4) Date Feb. 21, 2007,
PCT Pub. No. WO2006/025233, PCT Pub. Date Mar. 09, 2006.
Claims priority of application No. 2004-255227 (JP), filed on Sep. 02, 2004; and application No. 2005-052827 (JP), filed on Feb. 28, 2005.
Prior Publication US 2009/0115364 A1, May 07, 2009
Int. Cl. H02P 1/00 (2006.01)
U.S. Cl. 318—445  [318/432; 318/366] 2 Claims
OG exemplary drawing
 
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.