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Universal battery charger

  • US 5,214,369 A
  • Filed: 12/30/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 12/30/1991
  • Status: Expired due to Fees
First Claim
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1. A battery charger, comprising:

  • a source of electrical power for providing signals of cyclically varying amplitude;

    a switching device that is triggerable for coupling at least a portion of the varying amplitude signals to a battery to be charged;

    a trigger circuit for providing a trigger signal to the switching device;

    a logical ANDing circuit having at least two inputs for receiving electrical signals corresponding to criteria that must be satisfied before the switching device can be triggered, said logical ANDing circuit having an output for enabling the trigger circuit so that when the trigger criteria is satisfied, the switching device is triggered; and

    a trigger level detector coupled to one input of said logical ANDing circuit and responsive to a predetermined amplitude of the varying amplitude signal for enabling said ANDing circuit when the varying amplitude signal is below a predefined trigger level.

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