X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Reexamination Certificate
2006-12-19
2006-12-19
Thomas, Courtney (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
C378S111000
Reexamination Certificate
active
07151818
ABSTRACT:
Circuit arrangements and methods are disclosed for providing means of driving a grounded anode triode X-Ray tube using one isolation transformer, providing both filament power and controllable grid drive without the need for optical isolation devices. Applications of this design include fast X-Ray imaging such as inspection equipment and systems, which require rapid control of X-Ray intensity. Grounding the anode in X-Ray tube systems is usually done for thermal considerations and therefore requires that the filament and grid to be floating at an extremely large negative potential, usually over 100 kVDC. Isolation transformers are required to provide power to the filament and grid. In this invention, both AM and FM signals are coupled through one isolation transformer. The AM waveform provides controllable power to heat the filament while the FM signal, adjusted in magnitude by a filter arrangement, rectified and smoothed in waveform, provides power for the grid. This design eliminates the need for an additional grid isolation transformer or optical control of the grid element where active circuitry is prone to failure due to tube arcing.
REFERENCES:
patent: 4517472 (1985-05-01), Ruitberg et al.
Hanington Gary
Kurka Mira
Song Hoon
Thomas Courtney
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