Current mode control for DC converters operating over 50% duty c

Details Current mode control for DC converters operating over 50% duty c Current mode control for DC converters operating over 50% duty c

1986-12-11

1988-01-05

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 56, 363132, 323285, 323288, 323299, H02M 3337

Patent

active

047179945

ABSTRACT:
In a capacitively coupled DC-to-DC converter employing a pair of switching elements alternately rendered conductive, instabilities arising from current mode control are compensated for by detecting and controlling the amount of charge transferred by each switching element to a respective output capacitor associated therewith rather than the conduction period of each switching element. Converter instabilities arising from switching element duty cycles in excess of 50% are compensated for by integrating the sensed inductor current which represents the average inductor output current rather than its instantaneous value. An integrating network is discharged to 0 at the end of each cycle in resetting the sensed inductor current to 0 to prevent converter runaway when the switching element duty cycle exceeds 50%. This invention is applicable for all types of DC converters operating with a duty cycle greater than 50%.

REFERENCES:
patent: 3959716 (1976-05-01), Gilbert, Jr. et al.
patent: 4177389 (1979-12-01), Schott
patent: 4415960 (1983-11-01), Clark, Jr.
patent: 4564800 (1986-01-01), Jurgans
patent: 4586119 (1986-04-01), Sutton
Carl Nelson, "Switching Controller Chip Handles 100 W from a 5-Pin Package", Dec. 1984, p. 73.

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