Patent ID: 6744229
Filing Date: 2004-06-01
Classification: H02H,H02P

Abstract:
A safety-guard detection circuit for a fan motor applied to a driver circuit having an output terminal for detecting operation of a dc brushless motor, comprising:a resistor connected to the output terminal of the driver circuit, said resistor being adapted to limit a large current input into the motor driver circuit through the output terminal; and a discharge member connected to the output terminal of the driver circuit, said discharge member being connected to ground to discharge the large current limited by the resistor; wherein the motor driver circuit is protected by the safety-guard detection circuit, thereby preventing input of a large current to the motor driver circuit, and wherein the safety-guard detection circuit is selectively connected to one of: a collector of a transistor; and an output terminal of a Hall member of said driver circuit, whereby input of the large current to motor members is effectively limited.