The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2007
Filed:
May. 31, 2006
Mitsuyoshi Tsuchiya, Hitachi, JP;
Kazuhiro Takeuchi, Hitachi, JP;
Hideo Tsukamoto, Hitachi, JP;
Tsuyoshi Wakuda, Hitachinaka, JP;
Mitsuyoshi Tsuchiya, Hitachi, JP;
Kazuhiro Takeuchi, Hitachi, JP;
Hideo Tsukamoto, Hitachi, JP;
Tsuyoshi Wakuda, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
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.