Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
2007-05-15
2007-05-15
Duda, Rina (Department: 2837)
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
C318S811000, C318S461000, C388S800000, C388S804000, C388S811000, C388S907500
Reexamination Certificate
active
10695776
ABSTRACT:
A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The driving unit is connected with the digital/analog converting unit in series for receiving the voltage signal, while the driving unit provides a first predetermined voltage level and a second predetermined voltage level as references. The fan motor is kept to run with a low constant rotation speed when the voltage signal level is higher than the first predetermined voltage level, with a full constant rotation speed when the voltage signal level is lower than the second predetermined voltage level, and with a variable rotation speed when the voltage signal level is lower than the first predetermined voltage level and higher than the second predetermined voltage level.
REFERENCES:
patent: 5900706 (1999-05-01), Hisa
patent: 6400113 (2002-06-01), Garcia et al.
patent: 2002/0105293 (2002-08-01), Harlan
patent: 2003/0043606 (2003-03-01), Lipo et al.
patent: 2004/0105664 (2004-06-01), Ivankovic
patent: 2004/0247449 (2004-12-01), Ma et al.
patent: 9-233881 (1997-09-01), None
patent: 2002-223581 (2002-08-01), None
patent: 2003-164178 (2003-06-01), None
Hsieh Tsung-Jung
Huang Wen-shi
Huang Yuch-lung
Liu Cheng-chieh
Tsai Ming-shi
Birch & Stewart Kolasch & Birch, LLP
Delta Electronics , Inc.
Duda Rina
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