Digital controllers for DC converters

Details Digital controllers for DC converters Digital controllers for DC converters

2006-05-23

2006-05-23

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

07049870

ABSTRACT:
A digital controller for a DC converter has a timing and control unit which produces a control pulse signal with varying duty cycle and frequency in accordance with pulse on- and off-times determined by digital values read from a look-up table addressed via an A-D converter in dependence upon an input voltage for the DC converter. The stored digital values are such that a period of the control pulse signal varies over a range of about two-thirds to about four-thirds of a nominal value. Closed loop feedback control can be added by modifying addressing of the look-up in dependence upon an error signal from the DC converter output voltage, with scaling depending on the input voltage.

REFERENCES:
patent: 5148168 (1992-09-01), Masuda et al.
patent: 6008594 (1999-12-01), Kita et al.
patent: 6115266 (2000-09-01), Matsui et al.
patent: 6160722 (2000-12-01), Thommes et al.
patent: 6396317 (2002-05-01), Roller et al.
patent: 6545621 (2003-04-01), Madni et al.

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