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Patent Searching and Data


Title:
MOTOR DRIVING CIRCUIT AND MOTOR APPARATUS HAVING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/040953
Kind Code:
A1
Abstract:
A motor driving circuit (3) comprises a plurality of pairs of power-supply-side driving transistors (15,16) and ground-side driving transistors (17,18) that drive a coil (9) from a midway point; a driving current detecting part (19) that detects the driving current of the coil (9) on the power supply side; and a control circuit (20) that, when braking a motor rotating in a positive direction, selects and turns on the power-supply-side and ground-side driving transistors, causing the driving currents to flow therethrough, for applying a torque in a negative direction, and that, when the driving currents reach a predetermined value, turns off the selected power-supply-side and ground-side driving transistors to flow regenerative currents. Thus, there can be provided a motor driving circuit that, when applying a negative direction torque to a motor rotating in a positive direction so as to brake the motor, can control the torque.

Inventors:
YAMAMOTO SEIICHI (JP)
Application Number:
PCT/JP2005/018267
Publication Date:
April 20, 2006
Filing Date:
October 03, 2005
Export Citation:
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Assignee:
ROHM CO LTD (JP)
YAMAMOTO SEIICHI (JP)
International Classes:
H02P3/14
Foreign References:
JPS6434192A1989-02-03
JP2003189651A2003-07-04
JPH01169346U1989-11-29
JPS58172995A1983-10-11
JP2001045765A2001-02-16
Attorney, Agent or Firm:
Fukami, Hisao (Nakanoshima Central Tower 22nd Floor, 2-7, Nakanoshima 2-chome, Kita-k, Osaka-shi Osaka 05, JP)
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