Circuit for fan motor
AssigneeFoxconn Technology Co., Ltd.
InventorChin-Long Ku
Life of this patent
Estimating the term…
Abstract
A circuit (10) for a fan motor comprises a driver circuit (12) having an FG terminal which is able to output a first signal carrying speed information of the fan motor, a photo coupler (142) connected to the FG terminal to receive the first signal, the first signal being convertible by the photo coupler to a second signal carrying the same speed information, and a speed detection circuit (16) connected to the photo coupler to recognize the speed information by detecting the second signal.
Claims16
A circuit for a fan motor, the circuit comprising:
- a driver circuit having a frequency generation output terminal which is able to output a first signal carrying speed information of the fan motor;
- a photo coupler connected to the frequency generation output terminal to receive the first signal, the first signal being convertible by the photo coupler to a second signal carrying the same speed information;
- and
- a speed detection circuit connected to the photo coupler to recognize the speed information by detecting the second signal.
A method of detecting speed of a brushless direct current motor, the method comprising:
- obtaining a first signal which carries the speed information of the motor;
- converting the first signal to a second signal carrying the same speed information;
- inputting the second signal to a speed detection circuit to recognize the speed information.
A method for transmitting signals in a circuit, comprising the steps of:
- retrieving electrically said signals from a signal source of said circuit;
- electrically-isolatively transmitting said signals in said circuit;
- and
- generating said signals electrifiably in order to output said signals.
Dependencies are inferred from the claim text.