Generally speaking, it is a tesla coil of electronic switch with single resonance. The primary does not have series resonance, but only provides the secondary with the frequency that can satisfy the series resonance of the secondary LC, so that the secondary coil has series resonance. The primary current is the excitation source voltage divided by the ac impedance.
Advantages: low noise, high efficiency, long life characteristics, so has been a good development.
Disadvantages: the excitation power provided by the primary coil to the secondary coil is limited, and the arc is not long.
