Sensor circuit

Details Sensor circuit Sensor circuit

1976-12-01

1978-07-04

Goldberg, Gerald

Electric power conversion systems

Current conversion

Using semiconductor-type converter

323119, 340210, 363 45, H02M 708

Patent

active

040992276

ABSTRACT:
A circuit for sensing the motor stator voltage on any one or more phases of an AC electrical drive system. In a three phase system, all three phases of the motor terminal voltage are applied to a modified six-pulse rectifier bridge which in turn feeds a loading resistor. A resistor is added in series with each diode pair of the six-pulse rectifier bridge in order to provide any degree of attenuation of the peak voltage developed across the load resistor by simply varying the resistance values of these series input resistors and the load resistor. The resulting DC voltage generated across the load resistor is then fed into a differential amplifier (stage) where the voltage is attenuated and impedance isolated from the source to provide a DC output which is proportional to the average applied AC motor stator voltage.

REFERENCES:
patent: 1745841 (1930-02-01), Bradbury
patent: 2895059 (1959-07-01), Bell
patent: 3568032 (1971-03-01), Mages et al.
patent: 3571707 (1971-03-01), Houck
patent: 3584286 (1971-06-01), Randall
patent: 3846692 (1974-11-01), Hill

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