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AC/DC cascaded power converters having high DC conversion ratio and improved AC line harmonics

  • US 20040079953A1
  • Filed: 10/28/2002
  • Published: 04/29/2004
  • Est. Priority Date: 08/17/2002
  • Status: Active Grant
First Claim
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1. A power supply circuit comprising:

  • a rectifier stage for receiving an AC voltage input and for producing a first DC voltage;

    a direct-coupled first converter stage providing power factor correction and coupled to an output of said rectifier stage for converting said first substantially DC voltage to an intermediate DC voltage lower than a peak value of said first substantially DC voltage, said first converter stage comprising a first inductor coupled in functional series with a first diode, said series coupled circuit connected to said output of said rectifier stage, whereby said first converter stage is prevented from conducting energy into said rectifier when said first DC voltage falls substantially below a threshold; and

    a second converter stage directly coupled to said first converter stage for converting said intermediate DC voltage to an output DC voltage.

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