Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1983-05-25
1984-09-11
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 323285, 323288, 323299, H02M 3335
Patent
active
044714181
ABSTRACT:
A switching power supply in which the maximum power output is limited during various line voltages within a predetermined range on a cycle by cycle basis. The power supply comprises a transformer in which an alternating current voltage is applied across the primary winding thereof. Switching means are connected in series with the primary winding. The repetitive conduction and non-conduction of the switching means controls the flow of current in the secondary winding circuit of the transformer for producing a direct current output voltage in the secondary winding circuit. Output voltage is produced in the secondary winding circuit during the interval the switching means is not conducting. For limiting the maximum power output in the secondary winding circuit during various line voltages, a control circuit controls the maximum conduction time of the switching means in response to the rectified voltage appearing across the primary winding of the transformer. The conduction time of the switching means under the control of the control circuit is commensurate with the time it takes the current flowing through the primary winding of the transformer to reach a predetermined magnitude and is commensurate with the magnitude of the voltage across the primary winding of the transformer varying from a preselected magnitude. Thus, the output power produced in the secondary winding circuit has a predetermined maximum value although there is a variance from the preselected limits for the line voltage.
REFERENCES:
patent: 3911352 (1975-10-01), Slack
patent: 4183080 (1980-01-01), Liebman
patent: 4220987 (1980-09-01), Rao et al.
Compower Corporation
Schatzel Thomas E.
Wong Peter S.
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