Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1992-02-07
1994-02-08
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 78, 323267, 323282, 323284, H02M 3335
Patent
active
052853675
ABSTRACT:
An embodiment of the present invention is a switching power supply comprising a transformer with a primary and two secondaries, a switching transistor in series with the primary, a rectifier and filter on one secondary to provide regulated output power, a feedback control circuit that monitors the secondary and adjusts the duty cycle of an on-off control signal to the switching transistor to maintain a constant output at the terminals, and a monitor that detects when the power level flowing through the switching regulator has dropped to a predetermined minimum and then linearly turns on a load to the transformer. Transistor is typically a power MOSFET. The monitor tracks a summing junction current before any slope compensation is added. Load is a shunt regulator that is activated when the summing junction current falls below 12% of full scale. Alternatively, the predetermined value of 12% is adjustable. The shunt regulator load increases the load on secondary until the summing junction current returns to 12% of full scale. The feedback control circuit and monitor are preferably fabricated on a single monolithic integrated circuit which increases its power dissipation when the monitor activates the shunt regulator load.
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Berhane Adolf
Power Integrations, Inc.
Schatzel Thomas E.
Stephan Steven L.
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