Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
2007-10-02
2007-10-02
Duda, Rina (Department: 2837)
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
C388S800000, C388S811000, C388S907500
Reexamination Certificate
active
11430926
ABSTRACT:
A multimode integrated modulation circuit for controlling the fan rotating speed mainly includes a voltage regulating circuit, an integrated modulation circuit and a fan motor driving circuit. The voltage regulating circuit is used to receive an external voltage signal and regulate the external voltage signal to a suitable range of workable voltage and then a first output voltage is generated. The integrated modulation circuit that is electrically connected with the voltage regulating circuit is used to receive a PWM signal with a duty cycle and a second output voltage is accordingly generated depending on the product of the duty cycle of PWM signal and the first output voltage. The fan motor driving circuit is used to receive the second output voltage and decide the fan motor rotating speed depending on the second output voltage. Therefore, the present invention substantially adopts low-price circuit elements to integrate voltage regulating mode and PWM mode for controlling the fan rotating speed.
REFERENCES:
patent: 4856078 (1989-08-01), Konopka
patent: 6037732 (2000-03-01), Alfano et al.
patent: 6650074 (2003-11-01), Vyssotski et al.
patent: 2003/0198464 (2003-10-01), Horng et al.
Chen Chao-Ching
Hsieh Hsin-mao
Adda Corporation
Troxell Law Office PLLC
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