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Power factor correction circuit with high-voltage semiconductor component

  • US 6,819,089 B2
  • Filed: 08/01/2003
  • Issued: 11/16/2004
  • Est. Priority Date: 11/09/2001
  • Status: Expired due to Term
First Claim
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1. Switching power supply including a power factor correction circuit comprising:

  • a rectifier having a positive and a negative output terminal, an inductor having a first and a second terminal, said first terminal being coupled with said positive output terminal, a semiconductor switch having a semiconductor body comprising a blocking pn junction, a gate electrode, a source zone of a first conductivity type connected to a first electrode and bordering on a zone forming the blocking pn junction of a second conductivity type complementary to the first conductivity type, and a drain zone of the first conductivity type connected to a second electrode, the side of the zone of the second conductivity type facing the drain zone forming a first surface, and in the region between the first surface and a second surface located between the first surface and the drain zone, areas of the first and second conductivity type nested in one another, wherein the areas of the first and second conductivity type are variably so doped that near the first surface doping atoms in the area of the second conductivity type predominate over those in the area of the first conductivity type, and near the second surface doping atoms in the area of the first conductivity type predominate over those in the area of the second conductivity type, wherein said second electrode is coupled to said second terminal of said inductor and said first electrode is coupled with the negative output terminal of said rectifier, a diode having an anode and a cathode, the anode being coupled with the second terminal of said inductor, a capacitor having a first and second terminal, said first terminal being coupled with the cathode of said diode and the second terminal being coupled with the first electrode of said semiconductor switch, an input current sensor generating a signal proportional to an input current, and a control unit having at least two inputs and a control output coupled with said gate electrode, wherein the first input receives said signal from said current sensor and the second input is coupled with the first terminal of said capacitor.

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