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Title:
LOAD DRIVE CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP2009005460
Kind Code:
A
Abstract:

To provide a load drive control circuit which can make a status that an overcurrent flows into a semiconductor element in a circuit hardly occur even if a connecting terminal of the circuit is short-circuited to a positive pole of a power supply in a state that a load is stopped, and also can make an erroneous operation of the load hardly occur.

A first bridge circuit 7 connected to one motor terminal of a motor M and a second bridge circuit 8 connected to the other motor terminal of the motor M are arranged in the drive control circuit 6 in an H-bridge motor drive circuit. The drive control circuit 6 detects a current flowing in the circuit by using current detection transistors Cs1 to Cs4, and when the detected value is abnormal, the circuit determines that a short-circuiting to a positive pole of the power supply has occurred. When the drive control circuit 6 recognizes that the short-circuiting has occurred when the motor M is stopped, the drive control circuit brings the two bridge circuits 7, 8 into Hi-Z states, and conducts processing for electrically separating the motor M from a power supply Vcc.


Inventors:
NISHIBE TAIJI
KISHI DAIKI
Application Number:
JP2007162711A
Publication Date:
January 08, 2009
Filing Date:
June 20, 2007
Export Citation:
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Assignee:
TOKAI RIKA CO LTD
International Classes:
H02P3/06; H02P7/29; H02P7/291
Domestic Patent References:
JP2002204593A2002-07-19
Foreign References:
WO2003039208A12003-05-08
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda