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Ripple-free DC high voltage generating apparatus for X-ray tube

  • US 4,710,860 A
  • Filed: 11/21/1985
  • Issued: 12/01/1987
  • Est. Priority Date: 11/26/1984
  • Status: Expired due to Fees
First Claim
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1. A DC high voltage generating apparatus for an X-ray tube comprising:

  • primary rectifier means for rectifying a low AC voltage to derive a low DC voltage;

    bridge inverter means including a single phase transformer having primary and secondary windings, a capacitive element series-connected via a current limiter to the primary winding so as to constitute a series resonant circuit, a bridge inverter circuit having switchable elements for inverting the low DC voltage into a pulsating low voltage, and a switching controller for controlling the switch-on times of the switchable elements;

    secondary rectifier means for rectifying a high AC voltage induced at the secondary winding of the transformer by the pulsating low voltage into a high DC voltage for the X-ray tube; and

    switching means connected in parallel to the current limiter of the bridge inverter means, for changing the value of the pulsating low voltage induced at the primary winding by short-circuiting the current limiter so as to vary the high DC voltage derived from the secondary rectifier means.

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