Patent ID: 7091689

Claim:
A driving circuit for a two-phase DC brushless fan motor, comprising a control unit, a Hall element, a motor, a motor protection circuit, an MOS element, a reverse protection circuit and a temperature control circuit, wherein said Hall element, said motor, said motor protection circuit, said MOS element, said reverse protection circuit and said temperature control circuit are connected with said control circuit; wherein said control unit comprises a plurality of pins; wherein said Hall element is to detect the position of the rotor of a motor and to acquire the running status of said motor; wherein said motor and said motor protection circuit prevent the counter-electromotive force (CEMF) of said motor and the magnetic noise made by said motor is absorbed; wherein said MOS element is to control current value to achieve required rotation rate; wherein said reverse protection circuit is to prevent said control unit from damage and to keep the voltage of said control unit in an acceptable range in case of reverse voltage feedback or wrongly plugged connector; and wherein said temperature control circuit is tied in with said MOS element to sense the temperature; by comparing the voltage burdens, to act as a switch that, when the temperature is getting higher, rotation rate is speeded up; and to change the current to make the rotation rate meet the requirement.