Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1993-03-30
1997-01-14
Sterrett, Jeffrey L.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363132, H02M 310
Patent
active
055946356
ABSTRACT:
A novel, compact, converter structure utilizes a switching bridge configuration to provide a low voltage stress, constant frequency controlled converter whose switches and diodes all turn-on and turn-off with zero-voltage-switching. The novel converter configuration uses a full-bridge switching circuit comprising four diodes D.sub.1 -D.sub.4 and, in one embodiment, four active semiconductor switches S.sub.1 -S.sub.4. A resonant inductor L.sub.r is connected across the bridge nodes a and b, and parasitic capacitance of the diodes and active switches S.sub.1 -S.sub.4 are incorporated in an L-C circuit. Connected in parallel with the bridge is a voltage source or sink, depending on the direction that power will flow; and connected to node a or b is a current source or sink, again depending upon the direction of power flow. The present invention stores sufficient energy in the resonant inductor L.sub.r so that prior to each switch or diode commutation, charge present on the corresponding parasitic capacitance of that semiconductor may be removed by the current drawing action of the resonant inductor L.sub.r. In this way, all diodes D.sub.1 -D.sub.4 and active switches S.sub.1 -S.sub.4 operate with zero-voltage-switching. The novel bridge configuration directs the power flow from the source to the load, while passively guaranteeing voltage limitation across each diode and switch, and providing volts-seconds balance for the resonant inductor L.sub.r.
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Motorola Inc.
Sterrett Jeffrey L.
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