Patent Number:
7,612,521
Title:
Motor driving apparatus
Abstract:
In a fan motor drive circuit which drives a motor based on a pulse-modulated external control signal, a temperature control signal generator generates a pulse-modulated temperature control signal whose duty ratio changes depending on temperature. A signal synthesizer synthesizes the external control signal and the temperature control signal by a logical operation. A drive controller drives the motor based on output of the signal synthesizer.
Inventors:
Miyajima; Satoshi (Kyoto, JP)
Assignee:
Rohm Co., Ltd.
International Classification:
H02P 23/00 (20060101)
Expiration Date:
1/03/02017