By E. Forster (auth.)
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Additional resources for Equipment for Diagnostic Radiography
Example text
If the step-down transformer is not energized no voltage is induced into its secondary winding and points C, D remain at 50kV. As there is no potential difference across the filament no current flows through it. e. A is now lOV higher than B. This means that B is at a potential of 50000 V (50 kV) to earth and A at 50010 V which means a potential difference of lOV across A-B, C-D and of course, the filament itself. The important thing to remember is that, although the voltage induced into the secondary winding of the stepdown transformer is small it is being added during the exposure to an existing voltage of very high value.
Nt with the necessary heating current, the solId state recttfier has no need for such associated devices. ~his means that solid state rectifiers take up less space which means that they can be built into a single structure tube head, for instance, to provide full-wave rectification for high powered mobile units. llanufacturer of modern X-ray equipment now uses them IO preference to thermionic diode valves. 8. te that the black arrow head in the symbol POIOtS IO the dIrection of conventional current flow.
29 it can be seen that, as the kV control is moved to increase the voltage across the tube (anode voltage), the voltage applied to the space charge compensator transformer primary winding is in such a direction as to induce a voltage in the space charge compensator transformer secondary in such a direction as to oppose the voltage from the autotransformer, reducing current flow in the filament circuit. Conversely, when the kV control is adjusted so as to reduce the kVp across the tube, the voltage applied to the primary of the space charge compensator transformer is in such a direction that the voltage induced in the secondary is additive to the filament heating voltage, which 28 EQUIPMEN~ FOR DIAGNOSTIC RADIOGRAPHY results in an increase in filament temperature, In this way variation of kVp automatically adjusts the filament heating current to compensate for the effects of space charge.