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Rise/fall time control for X-ray pulses

  • US 8,755,491 B2
  • Filed: 03/29/2010
  • Issued: 06/17/2014
  • Est. Priority Date: 03/27/2009
  • Status: Active Grant
First Claim
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1. An X-ray generator for generating a fast rise-time pulse, said generator comprising:

  • a n-phase poly-phase transformer having at least one primary winding and at least one secondary winding per phase;

    n rectifier circuits, each one of said n rectifier circuits being electrically coupled to each of said at least one secondary winding per phase, each of said n rectifier circuits comprising at least a first capacitor electrically coupled to at least a first rectifier, said first rectifier electrically disposed between said at least one secondary winding and said first capacitor and configured to provide a fast rise time of a leading edge of a fast rise-time pulse, and at least a second capacitor electrically coupled to at least a second rectifier, said second rectifier being electrically disposed between said at least one secondary winding and said second capacitor configured to provide a filtered n-phase pulse flat-top; and

    at least n active control switches, each of said active control switches being electrically coupled to at least one of said primary winding and configured to set a selected one of rectifier mode;

         1) a fast pulse rise-time mode and

         2) a flat-top low ripple mode, andwherein each of said first capacitors is charged by a rectified phase ripple of less than n at or before a leading edge of said fast rise-time pulse, and each of said second capacitors is configured to operate with an n-phase ripple to provide a substantially flat top of said fast rise-time pulse.

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