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Patent Searching and Data


Title:
MOTOR CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP2004260971
Kind Code:
A
Abstract:

To provide a motor control circuit which can automatically stop a motor when CPU runs away in a simple circuit.

A motor control circuit 100 comprises a drive voltage control circuit 2 which regulates drive voltage and outputs it under instructions from CPU 1; a motor drive circuit 3 which rotates a motor 9 at a speed corresponding to the drive voltage; a NAND circuit 11 which is a logic circuit for CPU runaway detection that detects that there is a runaway if the CPU starts running away, and there is an timeout error output WDT of a watchdog timer; and a switch circuit 12 as a power supply switching circuit. If the NAND circuit detects the CPU's runaway, the switch circuit stops power supply to the drive voltage control circuit. Consequently, the switch circuit causes the drive voltage outputted by the drive voltage control circuit to be set to a value instructing to stop the motor, and thereby causes the motor to automatically stop.


Inventors:
KOJIMA RYOSUKE
Application Number:
JP2003051331A
Publication Date:
September 16, 2004
Filing Date:
February 27, 2003
Export Citation:
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Assignee:
TOSHIBA TEC KK
International Classes:
H02P3/06; H02P7/00; H02P29/00; H02P29/02; (IPC1-7): H02P3/06; H02P5/00; H02P7/00
Attorney, Agent or Firm:
Hisako Ishido
Mitsue Haba
Hideo Akazawa
Eiichi Yamaguchi