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Self-oscillating buck mode battery charger

  • US 5,783,930 A
  • Filed: 01/15/1997
  • Issued: 07/21/1998
  • Est. Priority Date: 02/16/1996
  • Status: Expired due to Fees
First Claim
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1. A self-oscillating buck mode battery charger apparatus incorporating an inductor for charging a rechargeable battery, said apparatus comprising:

  • an input for receiving a rectified DC input voltage;

    a switching element in communication with the input for controlling the application of a charging current to an output of said apparatus, wherein said output is adapted to be electrically coupled to at least one battery;

    a first capacitor for applying a drive signal to said switching element;

    a first control transistor responsive to said battery voltage for controlling conduction of said switching element;

    a second control transistor for turning on and off said first control transistor in response to the discharge of said inductor;

    a current sensing element for sensing current flow through said switching element;

    a latching circuit responsive to said current sensing element for turning off said switching element when said current flow through said switching element reaches a predetermined maximum value; and

    wherein said first and second control transistors are configured such that neither experiences said rectified DC input voltage when one said switching element is turned off by said latching circuit.

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