Circuit for fan motor

Details Circuit for fan motor Circuit for fan motor

2006-06-06

2006-06-06

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S432000, C318S721000

Reexamination Certificate

active

07057363

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.

REFERENCES:
patent: 3767978 (1973-10-01), Wemli
patent: 4355237 (1982-10-01), Harris, Jr.
patent: 4369371 (1983-01-01), Hara et al.
patent: 4568838 (1986-02-01), Honda et al.
patent: 5043587 (1991-08-01), Miki et al.
patent: 5703459 (1997-12-01), Yasohara et al.
patent: 5726881 (1998-03-01), Inaniwa et al.
patent: 6112546 (2000-09-01), Kim
patent: 6204627 (2001-03-01), Watanabe et al.
patent: 6744229 (2004-06-01), Horng et al.

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