Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Patent
1996-11-14
2000-03-21
Masih, Karen
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
318461, 318811, 318798, 318473, 318472, 318254, 318138, 318439, 388934, G05B 500
Patent
active
060406682
ABSTRACT:
Disclosed herein is a monolithic fan controller circuit which provides the following features: a special start-up routine for the fan; a fan fault detector; a thermal fault detector; an automatic speed controller; a minimum speed controller; a routine for attempting to clear temporary fan faults; and a controllable drive signal frequency. A start-up control circuit provides an initial high duty-cycle kick to the fan in order to initiate the rotation of the fan. A temperature sensor, which may be external or internal to the monolithic fan controller, supplies a signal which is proportional to measured temperature. This signal is used to control the output pulse width of a pulse-width modulator (PWM) or control the frequency of a pulse frequency modulator (PFM). The PWM or PFM output signal regulates the speed of the brushless (or brush) DC fan motor. In a preferred embodiment, the monolithic fan controller has 8 pins.
REFERENCES:
patent: 4659290 (1987-04-01), Kundert
patent: 4722669 (1988-02-01), Kundert
patent: 5019717 (1991-05-01), McCurry et al.
patent: 5364026 (1994-11-01), Kundert
patent: 5449143 (1995-09-01), Pecone
patent: 5744921 (1998-04-01), Makaran
patent: 5806440 (1998-09-01), Rowlette et al.
patent: 5831405 (1998-11-01), Massie
Alfano Donald E.
Huynh Quoi V.
Judkins, III Joseph James
Ngo Sang T.
Masih Karen
Schatzel Thomas E.
TelCom Semiconductor, Inc.
LandOfFree
Monolithic fan controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Monolithic fan controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monolithic fan controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-733056