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Circuit arrangement for testing the correct functioning of circuit(s)

  • US 4,901,008 A
  • Filed: 09/29/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 10/14/1987
  • Status: Expired due to Term
First Claim
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1. A circuit arrangement comprising:

  • (a) a load;

    (b) supply means for supplying current to said load via a current path;

    (c) a microprocessor connected for controlling the supply of current from said supply means;

    (d) means for detecting said current, said detecting means comprising;

    (i) a core of magnetizable material;

    (ii) a winding coupled inductively with said core, said winding being included in said current path; and

    (iii) transducing means for sensing magnetic flux in said core, said transducing means being coupled with said microprocessor for the supply to said microprocessor of an indication being dependent on the magnitude of said current;

    the circuit arrangement further including testing means for testing the condition of said detecting means, said testing means comprising;

    (e) a further winding coupled inductively with said core; and

    (f) further supply means, for supplying current to said further winding, said transducing means also sensing magnetic flux in said core due to current in said further winding when said further supply means supplies such current so that said indication supplied to said microprocessor is then dependent on the condition of said detecting means.

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