Title:
モータ駆動回路
Document Type and Number:
Japanese Patent JP5408893
Kind Code:
B2
Abstract:
A motor drive circuit comprising: a triangle wave generation circuit configured to charge/discharge a capacitor with a charging/discharging current having a current amount corresponding to an amplitude control voltage for controlling an amplitude of an oscillation voltage that varies in a triangle wave shape, and to output a charging voltage of the capacitor as the oscillation voltage; a pulse signal generation circuit configured to generate a pulse signal having a duty ratio corresponding to a level of a speed control voltage for controlling a rotational speed of a motor, based on a comparison result between the speed control voltage and the oscillation voltage output from the triangle wave generation circuit; and a drive circuit configured to intermittently drive a motor coil based on the pulse signal.
Inventors:
Toshiyuki Imai
Application Number:
JP2008084213A
Publication Date:
February 05, 2014
Filing Date:
March 27, 2008
Export Citation:
Assignee:
Semiconductor Components Industries Limited Liability Company
International Classes:
H03K4/06; H02P6/06; H02P6/08; H02P6/26; H03K7/08; H03K17/16; H03K17/687; H03K17/695
Domestic Patent References:
| JP2007068344A | ||||
| JP4021393A | ||||
| JP2006174648A | ||||
| JP63095886A | ||||
| JP6335286A | ||||
| JP7046886A |
Attorney, Agent or Firm:
Isshiki International Patent Service Corporation