AC-DC power supply

  • US 6,031,737 A
  • Filed: 09/01/1998
  • Issued: 02/29/2000
  • Est. Priority Date: 10/24/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. An AC-DC power supply comprising:

  • a three phase rectifier circuit generating a first rectified output in response to an input voltage having an input voltage frequency;

    a controlled three phase inverter circuit receiving the first rectified output and generating a pseudo-AC three phase output having a frequency higher than the frequency of the three phase AC supply supplied to the rectifier circuit, wherein the pseudo-AC three phase output is controlled by means of phase shifting;

    a three phase transformer receiving said phase shift controlled pseudo-AC three phase output; and

    a second three phase rectifier circuit receiving the transformed pseudo-AC three phase output from said transformer and generating the output DC supply, wherein said three phase transformer comprises;

    three secondaries each formed from a conductive tube, said conductive tubes being substantially parallel and electrically connected at first end thereof;

    three transformer cores, each corresponding to a phase, each in the form of a cylindrical member threaded onto a corresponding said conductive tube; and

    three primary windings each corresponding to a phase, wound so as to pass through the interiors of adjacent pairs of said conductive tubes.

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