Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1991-01-09
1992-07-21
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 49, 363 97, 363131, 323284, 323901, H02M 3335
Patent
active
051328909
ABSTRACT:
A current mode zero-voltage, parallel resonant switching power supply. The disclosed power supply includes a resonant tank comprising an inductorcapacitor pair, and having a variable output level. A solid-state switch controls the energy input to the tank. A comparator compares the voltage or other signal level from the switch to a threshold level so that the switch is closed when the voltage across it equals the threshold, and opened when the current through it corresponds to the threshold level. In one embodiment the threshold is produced by an error amplifier sensing the power supply output voltage, based on the difference between the output level and a reference level. A startup circuit is provided for energizing the tank when the power supply is initially powered, or under a load dump condition.
REFERENCES:
patent: 4698743 (1987-10-01), Onodera et al.
patent: 4829232 (1989-05-01), Erickson
patent: 4845605 (1989-07-01), Steigerwald
patent: 4888821 (1989-12-01), Hamp et al.
patent: 4964028 (1990-10-01), Spataro
patent: 5019953 (1991-05-01), Kawaberi et al.
Koss Corporation
Stephan Steven L.
Sterrett Jeffrey
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