System for supply of direct current to at least two electrical loads with a common polarity, in particular for multiple electric arcs
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United States of America Patent
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Feb 16, 1988
Grant Date -
N/A
app pub date -
Oct 1, 1986
filing date -
Oct 4, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for supply of direct current to at least two electrical loads having a common polarity, especially for power supply to an arc furnace with several electrodes or to plasma generators, comprises a set of load-controlled rectifiers (7) arranged in a Graetz bridge (A, B, C), in parallel upon a common alternating current power supply (5, 6). The half-bridges (A.sub.2, B.sub.2, C.sub.2) situated on the common-polarity side have a common dephasing control voltage, while the half-bridges (A.sub.1, B.sub.1, C.sub.1) situated on the other side are each controlled individually. This mechanism can be used in particular for power supply to arc furnaces or plasma torches.
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