Method and apparatus for active filament management
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United States of America Patent
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Aug 27, 2019
Grant Date -
Aug 3, 2017
app pub date -
Nov 14, 2016
filing date -
Nov 12, 2015
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Abstract
An apparatus and method for actively managing the current provided to an X-ray filament is provided. A feedback measurement of the actual filament current supplied to an X-ray filament is provided into a current manager and feedback system. An error amplifier compares the feedback measurement to a filament reference command indicating the appropriate current amount to be supplied to the X-ray filament, and the output of the error amplifier runs a pulse width modulator to provide a signal to an inverter to supply a voltage to the X-ray filament transformer. When a comparator senses sufficient high voltage is supplied to the X-ray tube, a second error amplifier is allowed to add to the filament current command an amount sufficient to make the X-ray tube's emission current match the commanded emission current. Additional circuitry and electronic switches are provided to allow the apparatus to operate in a dual-filament system.
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