Title:
MOTOR DRIVE DEVICE AND ELECTRIC DEVICE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/007742
Kind Code:
A1
Abstract:
A motor drive device (1a) includes: chopping signal generation means (151, 153)
for generating a chopping signal Sa when drive current of a driver (14) has reached
a first threshold value; chopping signal cut-off means (152, 154) for cutting
off the chopping signal Sa when the drive current has reached a second threshold
value which is greater than the first threshold value; and overcurrent protection
means (16) for generating an overcurrent protection signal Se when the drive
current has reached a third threshold value which is greater than the first threshold
value and its continuation time has reached a predetermined threshold value
time. Thus it is possible to simultaneously obtain the constant current chopping
function and the overcurrent protection function and to improve its reliability
and safety.
Inventors:
YANAGISHIMA DAIKI (JP)
Application Number:
PCT/JP2006/313749
Publication Date:
January 18, 2007
Filing Date:
July 11, 2006
Export Citation:
Assignee:
ROHM CO LTD (JP)
YANAGISHIMA DAIKI (JP)
YANAGISHIMA DAIKI (JP)
International Classes:
H02P6/12; H02H7/122; H02P6/06; H02P6/08; H02P6/28
Foreign References:
| JPH11206189A | 1999-07-30 | |||
| JPH05111144A | 1993-04-30 |
Attorney, Agent or Firm:
SANO, Shizuo et al. (Tenmabashi-Kyomachi Chuo-K, Osaka-Shi Osaka32, JP)
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