Title:
負荷駆動装置及び負荷駆動制御方法
Document Type and Number:
Japanese Patent JP4529666
Kind Code:
B2
Abstract:
A device for driving a load such as an electric motor for driving a fan mounted on an automobile includes a semiconductor power FET for supplying a load current to the load, a voltage detector for detecting a load voltage, a current detector for detecting a load current and a control circuit for controlling an amount of the load current. The load current is limited to a first limiting level when the detected load current exceeds a predetermined current level, and to a second limiting level, which is lower than the first limiting level, when the load current exceeds the predetermined current level and the load voltage becomes lower than a predetermined voltage level. By limiting the amount of load current, the power FET is surely prevented from being damaged by over-current even if a circuit including the load is short-circuited.
Inventors:
Hideo Watanabe
Application Number:
JP2004354232A
Publication Date:
August 25, 2010
Filing Date:
December 07, 2004
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H02P7/06; H02P7/29; H03B1/00
Domestic Patent References:
| JP5137370A | ||||
| JP4351491A | ||||
| JP2000333482A |
Attorney, Agent or Firm:
Tsuyoshi Sato
Kiyoshi Ogawa
Kiyoshi Ogawa