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Direct current power supply circuit having automatic linear and switching modes

  • US 5,034,676 A
  • Filed: 01/12/1990
  • Issued: 07/23/1991
  • Est. Priority Date: 01/12/1990
  • Status: Expired due to Fees
First Claim
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1. A direct current power supply for converting an unregulated direct current input voltage into a regulated direct current output voltage comprising:

  • (a) input and output terminals and a reference terminal;

    (b) first means coupled to said output and reference terminals and responsive to a current demand below a predetermined current value to direct current to said output terminal in a linear mode;

    (c) input control means coupled to said input terminal, said first means and said output terminal, said input control means responsive to current flow from said input terminal below said predetermined current value to direct substantially all of said input current to said first means and responsive to current flow from said input terminal above said predetermined current value to direct a variable portion of said input current directly to said output terminal;

    (d) wherein said input control means comprises a semiconductor device having electron emitting, electron collecting and control electrodes and a resistor coupled between said input terminal and said control electrode, said electron emitting electrode being coupled to said input terminal and said electron collecting electrode being coupled to said output terminal.

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