Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1997-10-20
1998-08-11
Tso, Edward
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363143, 323222, 323284, H02M 706, H02M 704, G05F 110, G05F 140
Patent
active
057936269
ABSTRACT:
A bimodal power converter, having an input couplable to a voltage source, provides a charging current to at least one of first and second serially-coupled output energy storage devices. The bimodal converter includes power switching circuitry, coupled to the input, for controlling the charging current conducted through the power converter and a mode selection circuit. The mode selection circuit includes a voltage sensing circuit for sensing an input voltage at the input of the power converter and a mode switching circuit, coupled to the voltage sensing circuit, for selecting an alternative one of a first and second mode of operation. In the first mode of operation, the charging current concurrently flows through both of the first and second output energy storage devices when the input voltage exceeds a threshold voltage. In the second mode of operation, the charging current alternates flowing through the first and second output energy storage devices when the input voltage is less than the threshold voltage. The mode selection circuit thereby decreases losses associated with components of the power converter. Concurrently, a duty cycle of the power switching circuitry reduces to decrease conduction losses associated with the power converter.
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Lucent Technologies - Inc.
Tso Edward
Vu Bao Q.
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