Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1992-08-20
1994-08-23
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 65, 323271, H02M 3335
Patent
active
053412788
ABSTRACT:
A single sided dc-dc converter utilizes a switched resonant circuit having pulsed currents and voltages. A pair of MOSFET switches are used to alternately charge a capacitor in series with an inductor from an input voltage source, and then to discharge the capacitor through a second inductor into an output capacitor. The charge and discharge currents are in the form of pulses, and flow in the same direction into the output capacitor to directly establish the output voltage. Both the "on" and "off" switching of each of the MOSFET switches is accomplished at zero current.
For a given input voltage source, the output voltage of the converter is determined by the size of the output capacitor and the repetition rate of the "on-off" charge-discharge sequences. The voltage output of the converter is monitored, and a controller responsive to changes in the output voltage varies the repetition rate of the charge-discharge cycle to maintain constant voltage output. For increased current capability, a series of converters have their outputs connected in parallel. In addition to a controller simultaneously controlling the repetition rates of the paralleled converters, a sequencer connects and disconnects converters as load conditions dictate. Each converter is inherently capable of withstanding a short circuit applied to its output without suffering damage, and each converter returns to full operation on removal of the short.
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"Switching Supplies"-Bassett, Electronics Jan. 7, 1988 p. 147.
Berhane Adolf
Robbins Daniel
Stephan Steven L.
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