Electricity: electrical systems and devices – Safety and protection of systems and devices – Superconductor protective circuits
Reexamination Certificate
2007-03-27
2007-03-27
Barrera, Ramon M. (Department: 2832)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Superconductor protective circuits
C361S141000
Reexamination Certificate
active
11443291
ABSTRACT:
A superconducting magnet system with a quench protection circuit includes a superconducting magnet having a plurality of series-connected superconducting coils, a persistent current switch connected in parallel with the superconducting coils, and first and second quench protection circuits connected in parallel with the superconducting coils and the persistent current switch. The first quench protection circuit includes anti-parallel diodes and parallelly connected resistive heaters and shunt resistors, and the resistive heaters and the shunt resistors are each connected in series with the diodes. The second quench protection circuit has a diode and a metal of copper connected with the diode, and a turn-on voltage of the diode in the second quench protection circuit is lower than a turn-on voltage of the diodes in the first quench protection circuit.
REFERENCES:
patent: 4689707 (1987-08-01), Schwall
patent: 5650903 (1997-07-01), Gross
patent: 6147844 (2000-11-01), Huang
patent: 2005/0231859 (2005-10-01), Huang
patent: 7-27815 (1995-03-01), None
Takeuchi Kazuhiro
Tsuchiya Mitsuyoshi
Tsukamoto Hideo
Wakuda Tsuyoshi
Antonelli, Terry Stout and Kraus, LLP.
Barrera Ramon M.
Hitachi , Ltd.
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