Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1983-07-29
1985-02-26
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323280, 34087037, 34087043, G05F 158, G08C 1902
Patent
active
045020035
ABSTRACT:
A two wire circuit has a total direct current signal, I.sub.t, proportional to a sensor signal which is responsive to a parameter to be sensed. I.sub.t flows through a first terminal which is coupled to an external power source and load and then through a second terminal. A current controller is coupled to the sensor and across the first and second terminals for controlling I.sub.t. A feedback amplifier amplifies a feedback signal which is responsive to I.sub.t to provide an amplified feedback signal. A span adjustment is coupled to the feedback amplifier and the current controller for receiving the amplified feedback signal to adjust the amplified feedback signal such that I.sub.t is controlled by the current controller as a function of the sensor signal and the adjusted, amplified feedback signal.
REFERENCES:
patent: 3646538 (1972-02-01), Frick
patent: 3680384 (1972-08-01), Grindheim
patent: 4193063 (1980-03-01), Hitt et al.
patent: 4287466 (1981-09-01), Quick
patent: 4370890 (1983-02-01), Frick
patent: 4390879 (1983-06-01), Kimura
Model 1181C Schematic Diagram, Rosemount Analytical Uniloc Division, Section 5.0, pp. 19-20.
Rosemount Inc.
Wong Peter S.
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