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Method and apparatus for modulating inverter pulse width

  • US 4,692,854 A
  • Filed: 03/04/1986
  • Issued: 09/08/1987
  • Est. Priority Date: 03/04/1986
  • Status: Expired due to Term
First Claim
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1. In an inverter for use with a ferroresonant transformer for powering an A.C. load from a D.C. source, the inverter having at lesat one current pulse from the D.C. source per A.C. half cycle, said current pulse being variable in width, the ferroresonant transformer having at least one input winding for said D.C. source and an output winding for said A.C. load, the improvement comprising means for detecting when the current flow for said input winding for the inverter-ferroresonant transformer is substantially at zero slope and a low value prior to saturation, and means for terminating the pulse width of the inverter, said means for terminating the pulse width being operated by said means for detecting substantially upon the occcurance of said zero slope and low value of said current prior to saturation, whereby the inverter pulse width is terminated before saturation can occur.

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