Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate
2006-06-12
2010-11-02
Assouad, Patrick J (Department: 2858)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
C388S819000, C318S400010
Reexamination Certificate
active
07826722
ABSTRACT:
A driving apparatus for fan motors, electrically connected between a pulse width modulation (PWM) signal generator and a controller, includes a converter electrically connected to the PWM signal generator, generating a first reference voltage according to the duty cycle of a PWM signal generated by the PWM signal generator; a reference voltage generator electrically connected to an external power source, generating a second reference voltage according to the external power source; and a comparator having a first and second input terminal and an output terminal; wherein the first input terminal is electrically connected to the converter, the second input terminal is connected to the reference voltage generator and the output terminal is connected to the controller, and when the first reference voltage is greater than the second reference voltage, a driving signal is output from the output terminal to the controller to control the rotation speed of the fan motor.
REFERENCES:
patent: 4855652 (1989-08-01), Yamashita et al.
patent: 5167709 (1992-12-01), Shinohara et al.
patent: 5675231 (1997-10-01), Becerra et al.
patent: 6407525 (2002-06-01), Horng et al.
patent: 6943517 (2005-09-01), Yoshitomi et al.
Hsieh Tsung-Jung
Huang Wen-Shi
Huang Yueh-Lung
Lin Yu-Liang
Assouad Patrick J
Birch & Stewart Kolasch & Birch, LLP
Delta Electronics , Inc.
McCloud Renata
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