Imagine two capacitors charged at the same voltage. Now, connect one of them to a high frequency switch, and then to the primary of a 1:100 transformer. On the secondary of this transformer, there is a diode bridge, and then, the second capacitor is connected. Will the voltage of the second capacitor be 100 times the voltage of the first one with this method? If it works, we can "charge" one capacitor to a higher voltage level from a lower voltage capacitor.