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Three-phase excitation circuit for compensated capacitor industrial process control transmitters

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • G01L-009/12
출원번호 US-0939079 (2001-08-23)
발명자 / 주소
  • Wang, Rongtai
출원인 / 주소
  • Rosemount Inc.
대리인 / 주소
    Westman, Champlin & Kelly
인용정보 피인용 횟수 : 13  인용 특허 : 107

초록

A capacitor industrial process control transmitter includes a three-phase excitation circuit to charge a sensing capacitor and a compensation capacitor of the transmitter and transfer charges to an integrator. The sensing capacitor is charged during the first phase. During the second phase, the volt

대표청구항

A capacitor industrial process control transmitter includes a three-phase excitation circuit to charge a sensing capacitor and a compensation capacitor of the transmitter and transfer charges to an integrator. The sensing capacitor is charged during the first phase. During the second phase, the volt

이 특허에 인용된 특허 (107)

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이 특허를 인용한 특허 (13)

  1. Wang,Rongtai, Capacitance-to-digital interface circuit for differential pressure sensor.
  2. Anderson,William Thomas; Wells,Christopher Ashley, Diagnostic system for detecting rupture or thinning of diaphragms.
  3. Speldrich, Jamie; Ricks, Lamar Floyd, Flow sensor with enhanced flow range capability.
  4. Qasimi, Mohammed Abdul Javvad; Hoover, William; Sorenson, Richard Charles; Becke, Craig Scott, Flow sensor with pressure output signal.
  5. Wang,Rongtai, Foldback free capacitance-to-digital modulator.
  6. Wang, Rongtai; Schulte, John Paul, High resolution sigma delta modulator for capacitance sensor terminal displacement measurement.
  7. Baker, R. Jacob, Integrators for delta-sigma modulators.
  8. Rozgo, Paul; Jones, Ryan; Ricks, Lamar Floyd, Method and apparatus for increasing the effective resolution of a sensor.
  9. Frick, Roger L., Multi-phase measurement system with synchronized sigma delta converters.
  10. Bentley, Ian; Ricks, Lamar Floyd, Packaged sensor with multiple sensors elements.
  11. Hammerschmidt, Dirk, Sigma-delta modulator for operating sensors.
  12. O'Dowd, John; McCartney, Damien, Variable capacitance switched capacitor input system and method.
  13. Milley, Andrew J.; Sorenson, Richard C., Variable scale sensor.
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