Title:
モータ駆動装置およびそれを用いた冷却装置
Document Type and Number:
Japanese Patent JP5450960
Kind Code:
B2
Abstract:
One terminal of a first capacitor is set to a fixed electric potential. A charging/discharging circuit charges/discharges the first capacitor using a current that corresponds to an input signal which specifies the revolution of a motor. A comparator compares a voltage at the first capacitor with a predetermined voltage. A control signal generating unit generates a control voltage having a level that corresponds to an edge timing of a frequency signal synchronized with the rotation of the motor and an edge timing of the comparison signal output from the first comparator. Furthermore, the control signal generating unit switches the charging/discharging state of a charging/discharging circuit according to an edge of the periodic signal and an edge of the comparison signal. The motor is driven with a torque according to the control voltage.
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Inventors:
Toshiya Suzuki
Application Number:
JP2008012190A
Publication Date:
March 26, 2014
Filing Date:
January 23, 2008
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02P7/29; H02P29/00
Domestic Patent References:
| JP61088778A | ||||
| JP10341585A | ||||
| JP2007037398A |
Attorney, Agent or Firm:
Sakaki Morishita
Masaki Taiki
Masaki Taiki