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Current measuring apparatus

  • US 4,160,950 A
  • Filed: 05/06/1977
  • Issued: 07/10/1979
  • Est. Priority Date: 05/10/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for producing a signal whose average value is representative of the sum of the currents flowing in the conductors of a polyphase electrical supply to a load, comprising a plurality of line conductors coupling the polyphase electric supply to the load, a core forming a magnetic circuit in which is positioned a Hall-effect magnetosensitive device, an individual energizing conductor magnetically coupled to the core of the magnetic circuit corresponding to each said line conductor of the polyphase supply, and a rectifier means in series with each of the line conductors, said rectifier means comprising a first rectifier element in series with a corresponding energizing conductor and a second rectifier element in parallel with the resulting series combination of the first rectifier element and the energizing conductor, the second rectifier element being oppositely poled to the corresponding first rectifier element, said rectifier means supplying each said energizing conductor with a unidirectional current which is a measure of the current flowing in the corresponding line conductor of the supply in a given direction relative to the load, which given direction is the same for all said line conductors of the polyphase supply, said unidirectional currents having polarities with respect to the corresponding energizing conductors such that the magnetic fields which are produced in the magnetic circuit will all have the same sense.

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