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Low noise, high frequency synchronous rectifier

  • US 4,903,189 A
  • Filed: 04/27/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 04/27/1988
  • Status: Expired due to Term
First Claim
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1. In a high efficiency synchronous rectifier circuit of the type including switching devices whose conductive state is controlled by an external control signal, a transformer for supplying an AC voltage to said switching devices for rectification and an output terminal, the improvement comprising:

  • each of said switching devices comprising;

    an insulated gate field effect transistor in which all of the semiconductor material is of a single conductivity type, anda diode connected in parallel with said field effect transistor in an orientation to conduct transient currents in its forward direction when said field effect transistor is non-conductive; and

    said switching devices, said transformer and said output terminal being interconnected so that a current path from said transformer to said output terminal is free of series connections of said switching devices.

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