Chinese ozone-twinkie with unusually good circuitry (with schematic)

The Chinese and Japanese sure do love their solid state air freshener units, and this is by far one of the best I've come across yet. It's unusual in having proper lithium battery protection, and the ability to operate continuously on a USB charger.

It's a unit that creates ozone on demand by applying a high voltage between a needle and ring to cause a small plasma discharge that temporarily rearranges oxygen atoms. It uses ionic airflow to carry the resultant ozone into the surrounding area.

The units are available in two versions. A battery version that takes four AA cells and runs for one of three durations when activated, or a USB rechargeable version that will cycle on and off to provide a continuous low level of ozone in timed bursts.

The units are sold for freshening cupboards and fridges and can be found by searching for this keyword string:-
Refrigerator Air Purifier Closet Deodorizer Filter Fridge Food Fresh Keeper

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