Method and device for pulse width modulation control

Details Method and device for pulse width modulation control Method and device for pulse width modulation control

1997-07-22

1999-06-22

Pham, Chi H.

Pulse or digital communications

Pulse width modulation

332109, H03K 708

Patent

active

059149841

ABSTRACT:
In a fully digital PWM controller employing a sine-triangle modulating technique, the method includes the step of linearizing the dependence of the selected scanning frequency of the memory containing the digital samples of the modulating sinusoid, from the value of the digital selection datum, and improves regulation at low speed by improving the resolution of selectable frequency values. The PWM driving signals produced by a fully digital controller implementing the linearization step of the invention show an F.F.T. extremely close to the F.F.T. of comparable PWM driving signals produced through a conventional analog technique.

REFERENCES:
patent: 4466070 (1984-08-01), Claussen
patent: 5119045 (1992-06-01), Sato
patent: 5231363 (1993-07-01), Sano et al.
patent: 5311548 (1994-05-01), Nikolaus
patent: 5519361 (1996-05-01), Kim
patent: 5737366 (1998-04-01), Gehlot

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