Load-driving device and method of driving load

Details Load-driving device and method of driving load Load-driving device and method of driving load

2006-12-26

2006-12-26

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S432000, C318S433000, C323S274000, C323S284000

Reexamination Certificate

active

07154240

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.

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