Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1998-05-19
2000-04-25
Masih, Karen
Electricity: motive power systems
Limitation of motor load, current, torque or force
318138, 318254, 318600, 318800, H01R 3946
Patent
active
060548231
ABSTRACT:
An apparatus for sensing the rotation of a brushless DC fan includes the fan and a sense/driver circuit and a capacitance. The sense/driver circuit is coupled to the fan to receive a sense input signal including a fluctuating electrical effect caused by fan commutation events. The sense/driver circuit processes the sense input signal to generate a sense output signal indicative of fan operation. The sense/driver circuit includes an integrated circuit. The integrated circuit includes a sense input pin, a ground return pin, a driver circuit, an integrated filter portion, a filter pin and a level detecting circuit. The capacitance is coupled to the filter pin to provide a filter with the integrated filter portion. The driver circuit includes a control terminal, a first current handling terminal coupled to the sense input pin and a second current handling terminal coupled to provide a ground return pat. The integrated filter portion includes a filter input coupled to at least one of the first and second current handling terminals of the driver circuit, and a filter output for providing a filter output signal to the level detecting circuit. The level detecting circuit generates the sense output signal from the filter output signal. The filter derives the filter output signal indicative of the fan commutation events responsive to receiving a signal at the sense input pin.
REFERENCES:
patent: 4097789 (1978-06-01), Doemen
patent: 4459519 (1984-07-01), Erdman
patent: 4479115 (1984-10-01), Holzhauer
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patent: 5606232 (1997-02-01), Harlan et al.
patent: 5727928 (1998-03-01), Brown
U.S. Patent Application Ser. No. 08/749,864, entitled "Monolithic Fan Controller," by inventors Quoi V. Huynh et al., filed Nov. 14, 1996, 24 pages (copy not provided per M.P.E.P. .sctn. 609).
"Integrated Fan/Motor Driver," TelCom Semiconductor, Inc. datasheets, Sep. 29, 1997, 7 pages (download from http://www.telcom-semi-com/datashts/TC643.pdf on May 15, 1998).
Alfano Donald E.
Collings Jerry
Huynh Quoi V.
Judkins, III Joseph James
Ngo Sang T.
Masih Karen
Schatzel Thomas E.
TelCom Semiconductor, Inc.
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