Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1994-03-21
1994-12-13
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 21, 361 18, H02H 7122, H02M 3335
Patent
active
053734343
ABSTRACT:
A control for a pulse width modulated power supply controls the duty cycle to provide sufficient charging to the output capacitor to satisfy a rated load, yet avoids saturation of the power transformer and overheating of the switch during and after excess line voltage conditions. The control comprises a sense transformer in series with a power transformer, a DC power source and a modulating switch. A rectifier is connected to a secondary winding of the sense transformer. The control also comprises a first capacitor coupled to the rectifier to receive charging current therefrom. The on time of the switch is based on a comparison of a voltage across the first capacitor to a first reference voltage while the power source exhibits rated conditions. During a large voltage transient the first reference voltage rises to an excess level and maintains the excess level after the transient subsides. Thus, the control also comprises a second capacitor coupled to the power source to receive charging current therefrom, and the on time of the switch is based on a comparison of voltage of the second capacitor to a gradually rising second reference voltage after the transient subsides.
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International Business Machines - Corporation
Nguyen Matthew
Samodovitz Arthur J.
Stephan Steven L.
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