Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1996-12-03
1998-04-14
Cabeca, John W.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318631, 318811, 388811, 363 41, G05B 1101
Patent
active
057396582
ABSTRACT:
A noise dithering system provides gating signals to switching transistors that selectively apply power to an output device in response to the gating signals, wherein said gating signals include a selected level of frequency modulation insufficient to alter operational characteristics of the output device more than a predetermined amount. One embodiment concerns a PWM switching system in which a PWM controller provides gating signals to switching transistors, where the gating signals are clocked by a timing circuit in accordance with a modulated input reactance sensed by a timing input node. In another embodiment, the gating signals may be clocked by the timing circuit in accordance with a modulated current at a timing input node, provided by a variable current source. In the case of the modulated input reactance, a voltage variable capacitor is preferably used to provide a capacitance proportional to output of a modulator. The modulator is operated to repeatedly vary the reactance about a predetermined level, in a manner that is insufficient to alter operational characteristics of the output device in excess of a selected level.
REFERENCES:
patent: 3886431 (1975-05-01), Meier
patent: 3916285 (1975-10-01), Iwat et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4074347 (1978-02-01), Hall
patent: 4214198 (1980-07-01), Schneider
patent: 4459651 (1984-07-01), Fenter
patent: 4516038 (1985-05-01), Glennon
patent: 4675802 (1987-06-01), Sugimoto
patent: 4691269 (1987-09-01), Yamane et al.
patent: 4700285 (1987-10-01), Szepesi
patent: 4724366 (1988-02-01), Neesz
patent: 4757241 (1988-07-01), Young
patent: 4870499 (1989-09-01), Suzuki et al.
patent: 5013931 (1991-05-01), Estes, Jr.
patent: 5051880 (1991-09-01), Harm
patent: 5086382 (1992-02-01), Feldtkeller
patent: 5089925 (1992-02-01), Lester
patent: 5105165 (1992-04-01), Fisher et al.
patent: 5130561 (1992-07-01), Elliott
patent: 5173847 (1992-12-01), Suzuki
patent: 5180964 (1993-01-01), Ewing
patent: 5196778 (1993-03-01), Hayashida
patent: 5207520 (1993-05-01), Tanaka
patent: 5225749 (1993-07-01), Watanabe
patent: 5355136 (1994-10-01), Katagiri
patent: 5427461 (1995-06-01), Hirai et al.
Cabeca John W.
International Business Machines - Corporation
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