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Adaptive boost switching preregulator and method

  • US 5,289,361 A
  • Filed: 01/16/1991
  • Issued: 02/22/1994
  • Est. Priority Date: 01/16/1991
  • Status: Expired due to Term
First Claim
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1. A boost switching preregulator comprisingboost switching power conversion means for converting power from a source of unipolar input voltage for delivery as a unipolar output voltage to a load, andcontrol means which accepts an input indicative of the magnitude of said unipolar output voltage and which, in response to variations in the magnitude of said unipolar input voltage, controls said boost switching power conversion means such that the magnitude of said unipolar output voltage varies within a range such that (a) said unipolar output voltage is greater than or equal to the magnitude of said unipolar input voltage, and (b) the span of said range is at least ten percent of the maximum value of said unipolar output voltage;

  • wherein said unipolar input voltage is a time-varying unipolar voltage derived from an AC source and having a peak value Vp, and said control means varies the value of said unipolar output voltage Vo within said range such that Vo is greater than or equal to Vp.

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