Inside a nasty high voltage ozone generator PSU. (with schematic)

I had a feeling the circuitry was going to be like this, but in a way it was simpler than expected.
This is a high voltage power supply for running dielectric barrier ozone generators like the inline air tubes and ceramic plate types.
The circuitry is clearly optimised for cost and reliability, at the cost of being quite electrically spiky. It literally shunts capacitors 100/120 times a second.

There's one slight oddity, even for such a simple circuit. I was expecting there to be something like a diac to provide a clean switching pulse to the thyristor. Instead it sees a fairly slow rise via a resistor and capacitor. The gate current on this component is a surprisingly low 200uA.

For those not familiar with thysistors, they are a power switching component that only conducts in one direction like a switchable diode. When a high enough current is flowing in the gate it causes the thyristor to latch on like a switch until the current flowing through it falls below its latching threshold. In this circuit it is being used to dump the charge on a capacitor through the primary of the simple ferrite rod transformer to induce a high voltage on the other secondary.

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