Thanks for writing. I belong to the Indoor Air Quality mailing list and ozonec is a popular topic, so I'm fairly well versed in the ozone matter.
The short version is that no ozone level is safe-the EPA has stopped just short of this declaration because they have a mandate to keep the air clean and they can't admit that they aren't doing their mandated function:>:
I read all the ebay auctions for these devices, and they all have ozone sections, claiming that the units they sell only produce XX units of ozone.....but they leave out the part about the volume of air that the results are spec'd for. Obviously I can put a small ozone generator in a large auditorium and measure no increase in ozone. But leaving out the volume of the room where the results were obtained is like measuring the carbon monoxide output of an engine that's upwind of the measuring device...'nuff said.
Somehow though, people continue to pay for these things, so the auction prices never drop low enough for me to afford to buy any to dissect. As PTB said, "there is a sucker born every minute".
The Customs department confiscates these things as they catch them coming into the US, and the FDA shuts down sellers when they find them. But, small time sellers (such as ebay sellers) fly under the radar and seem to get away with it.
I'm interested in the driver circuit itself, which doesn't seem to be documented. I know about the constant current mode which varies the frequency of the driver in order to regulate the output current. I'm interested in ultra low power high voltage generation, so want something that is efficient and runs in constant voltage more (by fixed frequency operation at the resonant frequency, and by varying the sine wave input drive signal amplitude). I think driving it with a sine wave avoids the ZVS problem that plaques square wave input signal operation. As far as I know, this means 'I have to roll my own' driver.
My guess is that this is how the personal ozone generators operate, although they probably aren't as concerned with efficiency of the driver as I would be.
M
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