High voltage x-ray circuits contain transformers, kVp and mA selectors, rectifiers, and timing circuits.

​

The incoming electrical supply is connected to the Autotransformer. Timing circuits shut off the high voltage to terminate the x-ray exposure after a selected exposure time.

​

The autotransformer is used to select the input voltage to either step-up or step-down transformer.

​

The transformer is used to produce high voltage. It converts an input voltage of a few hundred volts to an input to either step-up or step-down transformer. (The step-up or high-voltage transformer generate used to produce x-rays).

 

Rectifers then convert the high voltage AC to high voltage DC. The high-voltage DC is applied to the x-ray tube and x-rays are produced.

​

The step-down or filament transformer produces the mA tube current. Different autotransformers are used as the kVp and mA seletion.