What is special about high frequency high voltage power supplies?
High voltage power supplies can benefit substantailly from a high frequency design. Because they generally output voltages substantially greater than their input voltage, the transformer used is a step up type. It has more turns on its secondary than its primary. Voltage multiplication is often used in high voltage power supplies, and when high frequencies are also used, the complexity and physical size and weight of the rectifier/multiplier section is greatly reduced. In addition, smaller capacitance values are employed due to the high conversion frequency, and this substantially reduces the energy stored within the capacitors. This can be an important issue because stored energy (joules) increases with the square of the output voltage with a given capacitance value. When stored energy is very high, significant dangers are present with respect to human beings who may come into contact with the output voltage, and equipment is more likely to be damaged by an arc on the output.