Fan speed control circuit

Details Fan speed control circuit Fan speed control circuit

2007-06-19

2007-06-19

Ip, Paul (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S254100, C318S434000

Reexamination Certificate

active

11270494

ABSTRACT:
A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and the driving circuit outputs a driving signal according to the PWM control signal to a fan motor. The phase compensation unit is connected to the fan motor for delaying or advancing the PWM control signal by a phase angle to synchronize the acting period of the back electromotive force formed by the magnetic flux variation with the off-time of the PWM control signal. The present invention further provides a bi-power motor driving system including a motor rotating by receiving a first power from a first power generator, and a driving circuit for driving the motor according to a second power from a second power generator.

REFERENCES:
patent: 5099408 (1992-03-01), Chen et al.
patent: 5513361 (1996-04-01), Young
patent: 5825642 (1998-10-01), Ishii et al.
patent: 5848282 (1998-12-01), Kang
patent: 5869946 (1999-02-01), Carobolante
patent: 5952798 (1999-09-01), Jones et al.
patent: 6008603 (1999-12-01), Jones et al.
patent: 6054823 (2000-04-01), Collings et al.
patent: 6392372 (2002-05-01), Mays, II
patent: 6545438 (2003-04-01), Mays, II
patent: 6563284 (2003-05-01), Teutsch et al.
patent: 6650074 (2003-11-01), Vyssotski et al.
patent: 6690135 (2004-02-01), Mir et al.
patent: 6700339 (2004-03-01), Vyssotski et al.
patent: 6703803 (2004-03-01), Ohiwa et al.
patent: 6806673 (2004-10-01), Ho
patent: 6815916 (2004-11-01), Horng et al.
patent: 6850031 (2005-02-01), Nakata et al.
patent: 6965208 (2005-11-01), Chen
patent: 6979964 (2005-12-01), Roe
patent: 6995534 (2006-02-01), Berroth et al.
patent: 7030584 (2006-04-01), Alberkrack
patent: 2002/0060544 (2002-05-01), Teutsch et al.
patent: 2002/0149342 (2002-10-01), Nakata et al.
patent: 2003/0155886 (2003-08-01), Ohiwa et al.
patent: 2003/0198464 (2003-10-01), Horng et al.
patent: 2003/0222608 (2003-12-01), Vyssotski et al.
patent: 2004/0056617 (2004-03-01), Berroth et al.
patent: 2005/0002657 (2005-01-01), Martin
patent: 2005/0047761 (2005-03-01), Babb et al.
patent: 2005/0077849 (2005-04-01), Chen
patent: 2005/0257546 (2005-11-01), Ishishita
patent: 2006/0097677 (2006-05-01), Brannen et al.
patent: 2006/0097678 (2006-05-01), Alberkrack et al.

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