Start up circuit for DC powered field instrument

Details Start up circuit for DC powered field instrument Start up circuit for DC powered field instrument

1998-07-10

1999-10-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 50, 363 97, 363131, 323901, 323908, H02H 710, H02M 3335, H02M 324

Patent

active

059739428

ABSTRACT:
A direct current (DC) powered process instrument start up circuit includes an energy storage device, a switching regulator circuit, a variable impedance circuit, and a voltage measurement circuit. The energy storage device is coupled between first and second power supply terminals. The switching regulator circuit is coupled to the energy storage device and has a regulated voltage output. The variable impedance circuit is coupled between the energy storage device and the first power supply terminal and has an impedance control input. The voltage measurement circuit has a measurement input coupled to the energy storage device and a measurement output coupled to the impedance control input.

REFERENCES:
patent: 5087871 (1992-02-01), Losel
Ullrich Von Seckendorff and Karen Speers, "Selecting an Inrush Current Limiter", Electronic Products, Jan. 1995, pp. 33-25.
"Electronics Letters an International Publication," The Institution of Electrical Engineers, Aug. 29, 1996, vol. 32, No. 18, pp. 1629-1632.
A.S. Koslovski, "Fast Active Inrush Current Limiter for Boost-based Resistor Emulators," Sixteenth International Telecommunications Energy Conference, Intelec '94, Vancouver, B.C., Canada, pp. 649-652, Oct. 30, 1994.
"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.

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