Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-05-25
1981-08-11
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307310, 324117H, 323368, G01R 3300, H03K 1704
Patent
active
042836433
ABSTRACT:
A Hall sensing apparatus having a large dynamic range is adapted for generating a current signal substantially in phase with the current in a conductor. The Hall sensing apparatus has a magnetic field concentrator assembly with oppositely disposed pick-up plates, each with a centrally attached concentrator rod for being symmetrically positioned on either side of the conductor. A Hall sensor element is wholly positioned in the space between the ends of the rods remote from the plates. A current circuit, having an externally controlled current varying device and temperature drift control device in series with a current source, provides a Hall current through the sensor element. A detection circuit, coupled across the width of the sensor element, provides an inverted and non-inverted signal in phase with the conductor current which are coupled to the inverting input of a summing amplifier. A reference voltage is then coupled to the non-inverting input of the summing amplifier to generate a dc bias offset control signal which is coupled, in a negative feedback configuration, to control the Hall current and thereby decrease the dc offset bias.
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Davis B. P.
Electric Power Research Institute Inc.
Miller, Jr. Stanley D.
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