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Title:
MOTOR DRIVE CIRCUIT AND MOTOR APPARATUS EQUIPPED WITH THE SAME
Document Type and Number:
Japanese Patent JP2006109684
Kind Code:
A
Abstract:

To provide a motor drive circuit, capable of controlling the torque, when braking a motor that is rotating in the positive-direction by applying a negative-direction torque to the motor.

The motor drive circuit 3 is provided with a plurality pairs of power-source side drive transistors 15, 16 and ground-side drive transistors 17, 18 for driving a coil 9 from an intermediate point; a drive current detection means 19 for detecting the drive current of the coil 9 on a power-source side; and a control circuit 20 which selects the power-source side drive transistors and the other ground-side drive transistors for applying a negative-direction torque to the motor, to turn on the transistors so as to allow the drive current to flow, when braking the motor rotating in positive-direction and which turns off both the selected power-source side drive transistors and the selected ground-side drive transistors so as to allow the regenerative current to flow, when the drive current becomes a prescribed value.


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Inventors:
Yamamoto, Seiichi
Application Number:
JP2004000296967
Publication Date:
April 20, 2006
Filing Date:
October 08, 2004
Export Citation:
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Assignee:
ROHM CO LTD
International Classes:
H02P3/14
Domestic Patent References:
JPS58172995A1983-10-11
JP2004015855A2004-01-15
JP2004098988A2004-04-02
JPH01169346U1989-11-29
JPH02197293A1990-08-03
Attorney, Agent or Firm:
藤河 恒生