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(11) | EP 0 146 875 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | X-ray generator with voltage feedback control |
(57) A high-frequency transistor inverter operates from a fixed d.c. source to feed a
high-voltage transformer whose output is filtered and rectified for application to
an X-ray tube. The output voltage at the tube is sensed and a voltage feedback signal
is compared with a voltage-demand signal to obtain a voltage-error signal which is
applied to a control network for the inverter. The controller responds to the voltage
error signal and to various protective and synchronizing signals to control the individual
transistors of the inverter, in a pulse-width-modulated mode, to obtain a desired
voltage output to the tube. |