Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2011-06-28
2011-06-28
Tran, Khai (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Reexamination Certificate
active
07970063
ABSTRACT:
A field transmitter includes field device circuitry configured to measure or control a process variable. A first process control loop terminal is configured to couple to a two-wire process control loop which carries a loop current. A second process control loop terminal configured to couple to the two-wire process control loop. A switching regulator has an input and an output. The output is coupled to the transmitter circuitry and arranged to provide power to the transmitter circuitry. A variable voltage source having an input electrically coupled to the first process control loop terminal, and a voltage output coupled to the input of the switching regulator and a control input. The voltage output is a function of the control input.
REFERENCES:
patent: 4015609 (1977-04-01), Mensink et al.
patent: 4206297 (1980-06-01), Hoff et al.
patent: 4206397 (1980-06-01), Dahlke
patent: 4413224 (1983-11-01), Krupka et al.
patent: 4502318 (1985-03-01), Converse, III et al.
patent: 4606076 (1986-08-01), Davis
patent: 4621551 (1986-11-01), Silverman
patent: 4755773 (1988-07-01), Ohmagari
patent: 4804958 (1989-02-01), Longsdorf
patent: 4833922 (1989-05-01), Frick et al.
patent: 4866435 (1989-09-01), Frick
patent: 4889179 (1989-12-01), Merenda
patent: 4916381 (1990-04-01), Gelecinskyj et al.
patent: 4970451 (1990-11-01), Suomalainen
patent: 5087871 (1992-02-01), Losel
patent: 5089974 (1992-02-01), Demeyer et al.
patent: 5146401 (1992-09-01), Bansal et al.
patent: 5179488 (1993-01-01), Rovner
patent: 5184094 (1993-02-01), Kohler
patent: 5187474 (1993-02-01), Kielb et al.
patent: 5245333 (1993-09-01), Anderson et al.
patent: 5258868 (1993-11-01), Jensen et al.
patent: 5333114 (1994-07-01), Warrior et al.
patent: 5360997 (1994-11-01), Watson
patent: 5377090 (1994-12-01), Steigerwald
patent: 5535243 (1996-07-01), Voegele et al.
patent: 5541860 (1996-07-01), Takei et al.
patent: 5606513 (1997-02-01), Louwagie et al.
patent: 5610552 (1997-03-01), Schlesinger et al.
patent: 5659206 (1997-08-01), Taguchi et al.
patent: 5710552 (1998-01-01), McCoy et al.
patent: 5764891 (1998-06-01), Warrior
patent: 5973942 (1999-10-01), Nelson et al.
patent: 6178101 (2001-01-01), Shires
patent: 6313616 (2001-11-01), Deller et al.
patent: 6489755 (2002-12-01), Boudreaux et al.
patent: 6577516 (2003-06-01), Thoren et al.
patent: 6646362 (2003-11-01), Bert et al.
patent: 6680690 (2004-01-01), Nilsson et al.
patent: 6806693 (2004-10-01), Bron
patent: 6813318 (2004-11-01), Westfield et al.
patent: 7187158 (2007-03-01), Huisenga et al.
patent: 2002/0101748 (2002-08-01), Loechner
patent: 2005/0030185 (2005-02-01), Huisenga et al.
patent: 2005/0231182 (2005-10-01), Huisenga et al.
patent: 2005/0289276 (2005-12-01), Karschnia et al.
patent: 2007/0152645 (2007-07-01), Orth
patent: 2009/0309558 (2009-12-01), Kielb
patent: 2229897 (1990-03-01), None
patent: 4021258 (1991-01-01), None
patent: 4021258 (1991-01-01), None
patent: 0 529 391 (1998-06-01), None
patent: 2229897 (1990-03-01), None
patent: WO 94/01764 (1994-01-01), None
patent: WO 02/09268 (2002-01-01), None
Brochure: “Preliminary LTC1149, LTC1149-3.3., LTC 1149-5; High Efficiency Synchronous Stepdown Switching Regulator”, Linear Technology Corp. Milpitas, CA, pp. 1-16, Nov. 1992.
Ullrich Von Seckendorff and Karen Speers, “Selecting an Inrush Current Limiter,”Electronic Products, Jan. 1995, pp. 25-33.
“Electronics Letters an International Publication,” The Institution of Electrical Engineers, Aug. 29, 1996, vol. 32, No. 18, pp. 1629-1632.
“LM193/LM293/LM393/LM2903 Low Power Low Offset Voltage Dual Comparators”, National Semiconductor, pp. 1-12, Jan. 1995.
“LT124/Series High Speed Current Mode Pulse Width Modulators,” Linear Technology LT1241 Series, pp. 1-16, 1992.
A.S. Koslovski, “Fast Active Inrush Current Limiter for Boost-based Resistor Emulators,” 16th International Telecommunications Energy Conference, Intelec '94, Vancouver, B.C., Canada, pp. 649-652, Oct. 30, 1994.
EPO Communication pursuant to Rules 161(1) and 162 EPC for Application No. 097209.4.3-1239—PCT/US2009/001037 filed Feb. 19, 2009; date Oct. 19, 2010, 2 pages.
Brochure: “LM494, Pulse Width Modulated Control Circuit”, National Semiconductor, 7 pages, Jun. 1989.
Brochure: “High-Efficiency, +5V Adjustable Step-Down Switching Regulator”, Maxim Integrated Products, 8 pages, Dec. 1991.
Maxim Data sheet for Max 631/632/633 CMOS Fixed/Adjustable Output Step-Up Switching Regulators (Mar. 1990).
Article: “Getting Maximum Efficiency from a 4-20 mA transducer Power Supply,” by Bernhard Konrad of Maxim Integrated Products, Sensors, pp. 74-75, Apr. 1996.
A.S. Koslovski, “Fast Active Inrush Current Limiter for Boost-based Resistor Emulators,” 16thInternational Telecommunications Energy Conference, Intelec '94, Vancouver, B.C., Canada, pp. 649-652, Oct. 30, 1994.
Rosemount Inc.
Tran Khai
Westman Champlin & Kelly P.A.
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