Voltage and current sources

Details Voltage and current sources Voltage and current sources

1978-08-28

1980-08-12

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

324119, 328 26, 340210, H02M 702

Patent

active

042176344

ABSTRACT:
A source for providing a voltage or current which is (remotely) controlled by a digital signal includes a digital-to-analogue converter (30) which supplies a proportion of a reference voltage (V.sub.R) in accordance with the digital signal. The gain of an amplifier (48, 50) receiving an oscillatory signal is controlled by an error integrator (32) in dependence upon the difference between the converter output and a feedback signal derived via a precision rectifier (62) from a secondary winding (60) on a transformer (56), the primary (54) of which is coupled to the amplifier output, so the feedback signal tracks the converter output. Another (isolated) secondary winding (66) and precision rectifier (70) provide an output voltage equal to the feedback signal; the output voltage can be used to control a voltage-controlled current source (74). Although the output voltage or current is d.c. isolated, it tracks the reference voltage, so the source (14) can be coupled to the (floating) input circuitry (22a) of a digital voltmeter (22) and at the same time track the reference voltage in the separately-earthed analogue-to-digital converter (22b) of the voltmeter.

REFERENCES:
patent: 3145334 (1964-08-01), Berman
patent: 3478256 (1969-11-01), Tomota
patent: 3596165 (1971-07-01), Andrews
patent: 3947747 (1976-03-01), Smith

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