Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1980-10-06
1982-05-25
Shoop, William M.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323281, 363 21, G05F 146
Patent
active
043319122
ABSTRACT:
A circuit is coupled to an external power supply and is coupled to a non-live zero, two wire DC current transmitter (e.g. 4-20 MA output) for converting such current to a live-zero DC output current signal (e.g. 0-20 MA output) and for powering such transmitter. The circuit has a first current to voltage converter for converting the transmitter current signal to a voltage signal, and a second current to voltage converter coupled to receive the circuit output current signal and an offset current from an offset current source for converting the sum of the circuit output and offset currents to a second voltage signal. A comparator is used for comparing the first and second voltage signals to provide the live-zero output current signal representative of the non-live zero transmitter signal. The circuitry can also provide isolated power to the transmitter and feedback (closed loop) control of such power.
REFERENCES:
patent: 3646538 (1972-02-01), Frick
patent: 3675122 (1972-07-01), Rose
patent: 3697862 (1972-10-01), Taylor
patent: 3717858 (1973-02-01), Hadden
patent: 3735242 (1973-05-01), Andersen
patent: 3764880 (1973-10-01), Rose
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patent: 3864623 (1975-02-01), Luce
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patent: 4205327 (1980-05-01), Dahlke
patent: 4206397 (1980-06-01), Dahlke
patent: 4264896 (1981-04-01), Sakarya et al.
Goetzinger Charles E.
Ruesch James R.
Rosemount Inc.
Shoop William M.
Wong Peter S.
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