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Apparatus for diagnosing electric power source while power is supplied to load device from the power source

  • US 6,211,681 B1
  • Filed: 05/02/2000
  • Issued: 04/03/2001
  • Est. Priority Date: 05/24/1999
  • Status: Expired due to Term
First Claim
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1. A power source monitoring apparatus for monitoring a state of each of at least one subject power source which consists of at least one of a plurality of electric power sources in an electric system wherein a load device having at least one electrically operated load is electrically connected to said plurality of electric power sources, said power source monitoring apparatus comprising:

  • a detecting portion which detects at least one of a voltage and a current of at least one of said load device, said at least one subject power source, and at least one non-subject power source which consists of said plurality of electric power sources except said at least one subject power source; and

    a first diagnosing device which diagnoses said each subject power source for an abnormality on the basis of an output of said detecting portion, while said electric system is placed in a power supply state wherein an electric power is permitted to be supplied from only said subject power source to said load device.

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