Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1999-05-03
2000-04-04
Berhane, Adolf Deneke
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 52, H02M 5458
Patent
active
06046917&
ABSTRACT:
A controlled rectifier or SCR bridge converts a plurality of alternating current voltages from a plurality of alternating current phases to a rectified voltage. The bridge includes an input interconnected with the alternating current phases and an output having the rectified voltage. The bridge has a segment for each of the positive and negative polarities of the alternating current phases. Each of the segments has an SCR responsive to a control signal in order to control current conduction within the segment between the input and the output of the bridge. A phase control circuit outputs some of the control signals to some of the segments in order to control current conduction within the segments. A phase lock loop or startup circuit detects an abnormal condition of the AC voltages of the alternating current phases. A force firing circuit repetitively and simultaneously outputs all of the control signals to the segments in response to the abnormal AC phase conditions in order that the SCR bridge emulates a diode bridge.
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Gibbs Irving A.
Quayle Bruce R.
Berhane Adolf Deneke
Eaton Corporation
Moran Martin J.
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