Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Reexamination Certificate
2005-06-01
2010-06-22
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
C361S093800, C361S103000
Reexamination Certificate
active
07742270
ABSTRACT:
A system and method for limiting energy to an industrial control system is described. The method includes receiving a supply voltage, limiting the supply voltage so as to generate a limited voltage, and providing the limited voltage to a field transducer, the field transducer being disposed to monitor a parameter of the industrial process. A field current, that is generated in response to the limited voltage, is received from the field transducer and the field current is indicative of a magnitude of the parameter under normal operating conditions. During a fault condition, the field current is restricted with a variable resistance that is responsive to an amount of thermal energy generated during the fault condition so as to limit an amount of energy drawn by the control system.
REFERENCES:
patent: 3584190 (1971-06-01), Marcoux
patent: 3973170 (1976-08-01), Hogan
patent: 4099216 (1978-07-01), Weberg
patent: 4255698 (1981-03-01), Simon
patent: 4329726 (1982-05-01), Middleman
patent: 4518850 (1985-05-01), Grasso
patent: 5144517 (1992-09-01), Wieth
patent: 5365768 (1994-11-01), Suzuki et al.
patent: 5530613 (1996-06-01), Bauer
patent: 5995392 (1999-11-01), Turner
patent: 6104583 (2000-08-01), Wynn
patent: 6166516 (2000-12-01), Albright
patent: 6397322 (2002-05-01), Voss
patent: 2002/0109576 (2002-08-01), Wang
patent: 0 877 462 (1998-11-01), None
patent: 5183350 (1993-07-01), None
patent: 2001006518 (2001-01-01), None
patent: 2001209440 (2001-08-01), None
patent: 2001218361 (2001-08-01), None
patent: WO 97/48159 (1997-12-01), None
patent: WO 99/10903 (1999-03-01), None
patent: WO 02/45985 (2002-06-01), None
patent: WO 02/45985 (2002-06-01), None
Hokuriku, PTC Thermistor, Apr. 22, 2003, http://web.archive.org/web/20030422053420/http://www.hdk.co.jp/pdf/eng/e022100.pdf, all pages.
EPCOS; Application Notes; pp. 31-45 plus cover page; published in Oct. 2002.
European Patent Office search report for European patent application No. 05253553.1-2207.
Cooley LLP
Invensys Systems Inc.
Jackson Stephen W
Mai Tien
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