Current limiter device
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United States of America Patent
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-
Aug 18, 1998
Issued Date -
N/A
app pub date -
Mar 20, 1997
filing date -
Nov 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reversible short circuit current limiter which has at least one PTC thermistor connected in parallel with a shunt impedance branch, and is connected in series with at least one capacitor or a capacitor bank of the DC intermediate circuit. The short circuit current limiter may be arranged in the DC intermediate circuit or in the current convertor. A diode may be connected in the reverse-bias direction of a short circuit path in parallel with the PTC thermistor. The shunt impedance branch has a varistor connected in series with an ohmic resistor or a PTC thermistor and, if appropriate, an inductor. Structures of metal-based nonblocking PTC thermistors are specified.
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