7What gets transformed? Both voltage and current In a step-up transformer the voltage is increasedThe primary side (incoming) has less coils than the secondary (outgoing) side.Because there are more coils on the secondary side a higher voltage is producedIncreases voltage is reflected as a higher amplitude of the waveform.
8This occurs due to the conservation of energy. At the same time as voltage increases the current correspondingly decreases.This occurs due to the conservation of energy.If you increase one aspect, voltage, you have to decrease the other, current.(Voltagep)(currentp)=(voltages)(currents)
9Step down transformerHere the primary side has more coils than the secondary side.The result is a decrease in voltage through the transformer.
11Three sections of the x-ray circuit Operating (control) consoleHigh voltage generatorX-ray tube
12Operating (control) console Line voltage compensatorAutotransformerkVp selectormA selectorTimerPre-reading kVp meter
13Line voltage compensator The purpose of the line voltage compensator is to maintain a constant voltage to the system.In the modern system this is done automatically.
14AutotransformerThe autotransformer works on the principle of self-induction. It has a single core and is responsible for varying the voltage.Because of its ability to adjust voltage, the autotransformer can be either a step-up or step-down transformer.
15kVp selector kVp is adjusted at the autotransformer Taps are available so that different voltages can be achieved.
16Pre-reading kVp meterThe kVp meter is considered pre-reading because it is not actually measuring kVp but measuring voltage off the autotransformer.Remember, the autotransformer is used to adjust voltage.
17Timer Historically, there have been many types of timers. Today, all timers are electronic timers of various types.mAsPhototiming (AEC)Regular electronic
18mA selector Allows for adjust of the filament voltage Precision resistorsChoke coil
19High Voltage Generator Step-up transformerHigh voltage transformerHigh tension transformerStep-down transformerFilament transformerRectifiers
20Step-up TransformerThis transformer is responsible for producing the high voltages necessary for x-ray production.Turns ratio of 500:1 or 1000:1
21Filament Transformer Intended to lower voltage and increase current Allows for thermionic emission to occur at the filamentUltimately, provides the electrons necessary for x-ray production.Tube current measured in mA.
22Rectifiers Current traffic cops Intended to allow electrons to flow in only one directionProvide the mechanism that converts AC to DC current.4 rectifiers are required to fully convert AC to DC.
23Types of Circuits Single phase Three phase Medium and High Frequency Full waveHalf waveThree phase6 pulse12 pulseMedium and High FrequencyCapacitor dischargeFound predominantly in portables.