Summary
Highlights
The video introduces voltage ripple, which refers to the percentage drop from the maximum voltage supplied by an X-ray machine. This variation dictates the minimum and maximum power supply it can provide.
Single-phase power supplies, including half-wave and full-wave, have a 100% voltage ripple. This means that if the maximum voltage is 100 kVp, the minimum voltage supplied can drop to 0 kVp, as indicated by the voltage waveform where the voltage oscillates between maximum and zero.
Three-phase, six-pulse power supplies have a 14% voltage ripple. For a maximum of 100 kVp, this means the voltage will only drop by 14%, ensuring a minimum of 86 kVp. This results in a more constant voltage supply compared to single-phase systems.
Three-phase, twelve-pulse power supplies offer a significantly lower voltage ripple of 4%. With a maximum of 100 kVp, the minimum voltage will be 96 kVp, providing an even more stable and constant voltage supply than the six-pulse system.
High-frequency generators boast the lowest voltage ripple, less than 1%. This means that if the maximum output is 100 kVp, the minimum voltage supplied will be 99 kVp, ensuring the most constant and consistent voltage output. This is why high-frequency generators are the most commonly used in modern X-ray machines due to their consistent output.
The video concludes by summarizing the voltage ripple and corresponding minimum voltage for each power supply type, assuming a maximum of 100 kVp: single-phase (100% ripple, 0 kVp minimum), three-phase six-pulse (14% ripple, 86 kVp minimum), three-phase twelve-pulse (4% ripple, 96 kVp minimum), and high-frequency generator (less than 1% ripple, 99 kVp minimum).