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Direct-current power supply with alarm indicator

  • US 4,598,243 A
  • Filed: 11/23/1984
  • Issued: 07/01/1986
  • Est. Priority Date: 12/06/1983
  • Status: Expired due to Term
First Claim
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1. A direct-current power supply apparatus for supplying electric current to a load, a plurality of types of batteries being applicable to said apparatus, comprising:

  • housing means for installing therein a battery employed;

    monitor means for monitoring a voltage output from the battery installed;

    indicator means for indicating a warning condition of the battery installed;

    comparing means for comparing the voltage monitored with a reference voltage to energize said indicator means when the monitored voltage becomes lower than the reference voltage;

    voltage generating means for generating a plurality of voltages as the reference voltages associated with said types of batteries available; and

    selecting means for selectively supplying one of the plurality of voltages generated to said comparing means, said plurality of voltages each being set to a value higher than a limit voltage which is sufficiently low for allowing a normal operation of said load.

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