DC power supply circuit
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United States of America Patent
Stats
-
Nov 19, 1996
Grant Date -
N/A
app pub date -
Dec 19, 1994
filing date -
Dec 28, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dc power supply circuit connects a plurality of dc circuit breakers to a semi-conductor converter, returning again to the semi-conductor converter through a dc driving part such as an electric railcar connected to each dc circuit breaker. A second dc circuit breaker of larger capacity than the above-mentioned dc circuit breakers is provided in a return circuit and opened when a short circuit current is detected. A current decreasing means opens the second dc circuit breaker to decrease the short circuit current and includes, for example, a series-circuit of a resistor R and a reactor L. The dc power supply circuit has a large interruption capacity with low resistance loss.
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