Patent Number: 6,297,608

Title: Drive circuit for a speed automatically adjusted fan

Abstract: A drive circuit for a speed automatically adjusted fan comprises an actuating circuit, a temperature control circuit and a current control circuit. The actuating circuit has a Hall IC to control two transistors in a state of connecting and in a state of disconnecting sequentially so as to alternately magnetize two coils connecting to the two transistors respectively and then to rotate the fan. The temperature control circuit has a heat sensitive resistance to sense the ambient temperature and varies resistance value thereof accordingly such that the magnitude of the current passing through. The current flowing through the current control circuit is fed back to the actuating circuit so that the speed of the fan can be changed with respect to the magnitude of the current to meet the purpose of speed automatically adjusted for the fan.

Inventors: Lin; Yu Liang (Kaohsiung, TW)

Assignee: Asia Vitel Components Co., LTD

International Classification: F04D 27/00 (20060101); H02P 001/04 ()

Expiration Date: 10/02/2018