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This seems a fairly well designed product with quite a lot of deja-vu in the electronics. I've looked at a number of other fridge ozone units in the past with very similar circuitry.
I'd guess the reason the fan and high voltage module are on separate transistors is to allow fan over-run or cycling of the ozone to regulate the output.
The physical design and construction of this unit is stylish and fairly sensible. It's unusual that the ozone generating plate has the active area facing away from the fan, but I'd guess air turbulence makes up for that. It certainly smells strongly of ozone in use.
Aside from use in fridges and food cupboards, the unit is also good for small rooms and wardrobes for combatting musty smells.
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A usb rechargeable electronic lemon sterilizer for your fridge, it doesn't sterilize limbs, i mean technically, speak. I suppose it does. Sterilize limbs, it's just lemon themed came in a nice box. It's notable that uh it's available in the yellow, the green or white and uh.

It goes under various brands, this one's one sole, but it's also sold under the brand three life and also xiaomi, but they say it's part of the ecological chain product, so it doesn't have the xiaomi logo on it. I'm not sure what that's about. Maybe it's just: they allow him to use the logo, but the idea is you press this button and after a couple of seconds it energizes and i'll hold that? Can you see it? Yes, you can see it's flashing, green and it goes on at low level, and it will last for 14 days in a charge, apparently press it again. It goes into blue mode and it will run for longer periods of time flashes, the blue light, if you press it again, it switches back to the green mode.

If you press and hold it goes off, and i can already smell ozone lots of ozone. This o-ring was to stop it rolling about all over the place. Oh, it's still running. I've switched into other mode.

I'll. Tell you what you can hear it, then it's hissing and making some motory noises. This thing stinks uh. It puts out quite a lot of ozone.

It comes instructions in chinese and english they're, not too bad usual disclaimers. It doesn't really tell you an awful lot really other. You know turn it on and off and it's got a usb port. I shall turn this off before i over ozonate the place.

It's got. A usb port in the bottom usbc, if i can get this out with my lack of fingernails little thing - that pops down usb c connector when it's charging it lights, uh red to show it's charging green when it's finished charging the usual thing. Now, how do i open this? I thought the top might unscrew in some way or it might pop off, but it's not popping off. I get the feeling i'm going to have to put the spudger down here and try and pry the top bit out here.

I could be wrong here, maybe it's glued, maybe i'm just going to break it. Oh this doesn't feel good. Oh i've already scratched it's lovely chromium finish! That's just what's going to happen, then. Is it going to come out there? Am i going to pause while i try and get this out? Am i going to bend my spudger? Am i going to snap my spudger? I'm not sure this is not looking promising.

I don't know how this comes apart. I may have to use brute force and keep in mind. The whole point of this channel is to take these things apart. So if i break my lemon, if i break my lemon, then you know at least it might save you breaking yours right.

Tell you what? Let's just get brute force and go under here and press it up. It's popped off. How is that held on uh? I can't really see how it was held on. Oh, it's clips.

It is little clips down here. So that is how it comes off. What do we see here? Oh that's, interesting. I've not seen one quite like that before there's a little fan.

Let me zoom down on this. Here's the high voltage power supply. It's not a very big high voltage power supply, but it certainly does the job. Let's turn this on, it says: 5 volt dc.

I wonder if they're actually running it direct from the battery or if it is 5 volts. There's a little fan there and here is the ozone plate. Are you going to be able to see anything here? I can hear it hissing, but i can't see anything too odd. I shall take the exposure off.

I shall turn the light off and we'll see. Oh there there we go, there is hold on, let's uh focus down. That is it going to focus on that. There is our ozone discharge on that little plate right table, i'm just going to bring the lighting back watch your eyes.

So, what's odd about this little ceramic ozone plate is it's dark ceramic they're, usually a sort of pale white ceramic and it's the one that will have the little electrode in the front and the larger electrode in the back. Can i get this out? Is it glued in? I think it is glued in not really sure, let's try not to break, although to be honest, it's not like. I've got a shortage of ozone producing devices. I think that's glued in so there's a risk it's going to break, but the idea is it's a layer of ceramic with a electrode, neither side and the capacitively couple, and you get the corona discharge forming around that and it gives the purple discharge and that creates The ozone quite odd that the fan is just blowing this way, because i it should be blowing across the surface of that for best effect, but i guess they're just using it to swirl the air around in its vicinity.

It certainly does the job of producing ozone. This is how this comes out now that i've chowed all around the edge there are screws down here. Let's see what battery is, if it's an 18650r a little pouch cell claims to be about 2 500 milliamp hour. I love that one of the adverts for this has a picture telling you how to use the button.

It's very helpful. It says it shows a very distended image of the thing says: lemon sterilize one button start it's very practical to make it simple: single key switch to switch gears, bid farewell to tediousness and free hands, and i have to say i did not experience any tediousness pushing The button i didn't really experience much pushing the button quite frankly, uh. I keep pushing the button in this that oh it's an 18 650. So so it does have the potential for enhancement.

I'll, tell you what let's, oh that unplugs! This is better there's a little usb connector in the bottom uh, and here is the circuitry. What's the bet that this is the charge control chip tp405 six or something like that - and this will be a microcontroller they've got separate connectors out here. I wonder if that's a i wonder: if that's a power bank chip and it's putting five volts out, we shall find out. I can unplug the battery.

That's a good idea actually is a good idea, because i should have tested that beforehand. Right tell you what i'm going to whip the circuit board out, so we can take a look at it looks like it's single-sided and then we can explore the circuitry and see how it's configured the reverse. Engineering has been done. Let's explore the circuitry things worthy of note to comply with the usbc standard.

They've got two 5.1 k resistors down here. It's also quite a nice arrangement that circuit board for the connector is actually slotted into a little guide track there, but then there's a screw that clamps it down to make sure that, even when it's being plugged in quite forcefully, it can't really push it out of Place it's quite snug. It also fits the uh the way they molded this. The chromium top has a little baffle in here to ensure that air is drawn in this side.

The baffle stops it just basically swirling around inside and then it pushes it past the ozone plate, which is a little support here that just pushes on the edge of that plate to keep it in position in the unit. It's also interesting to note on this circuit that it's all surface mount on top uh, but there is one surface mount component underneath that's the only one and it's a little led. Let me actually zoom down in this because uh that would work better. You can see the circuit better if i do that, but if i plug this in you'll, see there's an led here here and one underneath and you'll see that just going to do a wee self test and plug this in so i plug it in they light Up brightly and then they go out again, so each of those leds can actually do red, green and blue and they're all just in parallel with these resistors going over to the chip.

Let's explore the circuitry, the usb port connection comes in here and it's a standard range. It's got a tp4056 uh charge control chip charging lithium cell over here. The lithium cell also has another chip called an xb5352a, which is a dedicated protection chip. It's basically like a dw01 and mosfets all just crammed into one package, and this monitors the voltage across the cell using uh, let's simple, resistive and capacitors of uh filter, just to make sure it's got a nice stable, voltage, um, and then it decides if the voltage Goes too high, it will cut the cell off and if it goes too low, it will cut the cell off.

In this case, the upper charge limit should be dealt with by the tp456, so the lower charge limit thing will be useful for just cutting off once the actual the battery is running low. There is the ubiquitous little microcontroller here with a programming port. It controls the leds, via these 100 ohm resistors. It controls the mosfets switch them directly with 10k resistors to make sure they're always pulled off, and it provides a positive signal to them to turn on one of the mosfets and a07t controls the module, the ozone module, which has a back emf, diode across it.

The other mosfet, because it's just controlling a small fan to be honest, they could use both identical ones, but they've used an a006 mosfet for that i've not really come across that one much before um anything else. To say about this: let's go straight to the schematic. I shall zoom up just a tiny bit more, not too much so here's the usb c port coming in here it goes via a 0.1 ohm resistor and then there's a capacitor. This is just part of the data sheet for tp4056.

It seems to to protect against a sudden spike of current there's a voltage divider, and this is where i'm getting deja vu from other ozone units very similar. I get the feeling they're, probably from the same factory or the same designer, but they've got a voltage divider in the five volts to give a signal to this chip to tell it that it's, the usb is plugged in it also and there's an excess resistor here. It's very odd. These uh pins and the tp-4056 would normally show charging and standby.

Once it's fully charged the standby one, they've got two resistors pulling up to the five volt rail, which uh technically speaking, means that they've they're printing well current limited, but five volts down to this chip um. But when it's uh fully charged, it pulls that low. So that when the chip sees that pin go low, it knows and it's seeing power here, it can switch to green and say the battery is charged. That then goes across to the lithium cell with its protection here, so this is going to be zero volt down here.

I shall also draw that little that little usual symbol you put down there for ground rails, to show that that is connected to that, and this will be, let's say, plus 4.2 volts, uh interesting to know the ozone module is powered straight from the battery, which means That, when it's down about three volt region, this is a five volt module in this. It may do what some other ones do and actually dwindle off an output. I'm not really sure the microcontroller has a switch pulling to the zero volt rail to basically turn it. On set the the mode, it's got the three 100 ohm resistors driving the leds, and then it's got the two outputs driving the mosfets one for the fan and one for the ozone module with its uh back emf: protection diode that they've just added, presumably just as A a precaution, the a0006 i have found as an si2300.

The a07t is an ao3400 um, very popular mosfet. Well, this the a006, i'm not so sure about. I haven't really come across that one much before uh what else the two 10k resistors that pull the gates of the mosfets to the zero volt rail just to actually make sure they stay off until they're, given a signal to turn on that is about it. There's not much else, it's a very simple circuit, very straightforward, quite a stylish thing, i'm just going to zoom back out here um.

I think the style of this is the most appealing feature, but when it comes the crunch, there's not a lot of difference between this. The circuitry, wise and the function and many of the other devices, the other modules that i can recall using very similar circuitry, were the ones that the little metal spike behind a ring. But this it's nice that they've got the little fan in here uh for to blow your past and this strange dark ceramic plate very odd nice that they actually put a decent cell. It is marked 2 500 milliamp hour, but that's it.

It's a logical little device. It uh does what it says in the tin: it's got that little button, selecting the flashing green mode and that's the point at which the fan is running. I'd guess that the main difference between the green and blue mode is that uh it will run for a different length of time on a sort of regular cycle, but these things work. I've had a ozone generator in my fridge for a while, and it keeps it very fresh, smelly inside.

It also makes food last a lot longer in the fridge because it stops like mold growing on this cheese and stuff like that, and it seems to keep the salad and stuff fresh, but there we go it's an interesting device very stylish. This is stinking of ozone. Now it is working very well uh i'll press that it will go to the blue mode. The blue leds were notably a lot dimmer than the green that they usually are, but there we go interesting, stuff, a nice little unit.

Quite it's very stylish, but that's how it comes to bits you have to pop the chrome cover off and then there's the three screws that actually lift this from the base. Uh, just in case you get the urge to take yours to bits and that's how you do it, but there we go very neat. Little device looks very smart, looks very japanese and the circuitry is logical.

15 thoughts on “Xiaomi high voltage refrigerator lemon”
  1. Avataaar/Circle Created with python_avatars Daniel Georgianni says:

    A decimal in the middle of the the numbers notates multiplication between the numbers on either side.
    You should keep your decimal to the bottom of the numbers as to not confuse people.

  2. Avataaar/Circle Created with python_avatars Grumpy John TX Redneck RC says:

    I Can't Find This Ozone Lemon Anywheres On Our US eBay, Butt I Did Buy 3 Of The Short 3" Tri-Angular Ones For $9.99 Each w/Free Shipping In The Bright Green Color, They Work Quite Well & Need Recharge About Every 7-10 Days? 😁 Thanks

  3. Avataaar/Circle Created with python_avatars supickumaterinu says:

    alltrough it looks nice, i actually think its quite bad design. Just imagine how much non-tech-savy people would try to use this thing as actuall lemon squeezer. My grandma would be one of thoose people, which could be dangerous for her, since she have electronic heartstarter implant

  4. Avataaar/Circle Created with python_avatars Sheeple Hunter says:

    You are ignorant to the facts. Just because something is natural in our air doesn't mean it isn't toxic. Carbon Monoxide and different Nitric Oxides occur at ground level ( the Troposphere) at much higher rates than ozone and are very toxic, but not as toxic as ozone. Ozone is the main component of smog and is dangerous to health and the environment, it is very toxic. The vast majority of ground-level ozone, not to be confused with the upper atmosphere's protective ozone layer, is created by reactions between environmental pollutants, light, and heat. It is only produced "naturally" at ground level when lightning strikes, and that only makes up a small portion of tropospheric ozone.

    Your statement that "It's only bad when it is at very high concentrations," doesn't provide any proof that you even know what constitutes a high concentration, because the safe limit recommended is as low as between 0.070 parts per million (EPA recommendation) and 0.10 parts per million (OSHA recommendation) for no longer than 8 hours. According to the EPA, "Adverse health effects from ozone are more likely to occur when ozone levels exceed the EPA standard, but are possible when ozone levels are below the standard, especially in sensitive populations." That means at most one part of the air per 10 million parts is considered the most anyone should be exposed to over an 8 hour period and as I previously mentioned, people can experience health problems at lower levels if they have any form of asthma, if they are children due to weaker longs than adults, or if they are elderly. I wouldn't consider only one part per 10 million to be a "very high concentration" relative to most things, so your answer is an ignorant dismissal of legitimate problems. Most products that have been tested usually produce much higher levels than what is found to be safe, and it's even more dangerous when used in enclosed spaces like a fridge. Also, Chinese products aren't going to care at all about being in compliance with OSHA or EPA guidelines.

    The EPA also has shown that ozone can eliminate odors, but the catch is that zero studies have been able to do so without exceeding toxic levels, and they also found that they are not effective at preventing things like mold/bacteria and or eliminating air contaminants at safe levels. As a result of reviewing research available to this date, EPA, as well as researchers from universities like UCLA, strongly discourage the in home use of any type of ozone generator.

  5. Avataaar/Circle Created with python_avatars nirmal says:

    Does ozone play nicely with electronics in confined spaces? I placed a large ozone generator device in the foot well of my car to get rid of the damp smell after a shoddy valet job and it broke the lcd display of the heater control. I'm not sure if it was the ozone that did it or whether it was just a coincidence, but I've been a bit wary of keeping ozone generators close to electronic devices ever since.

  6. Avataaar/Circle Created with python_avatars TheHighwayMan says:

    I have another ozone lamp for sterilizing rooms, and in the instructions for it it says to remove all food from the room because of the rapid oxidization effect. ( also plants and of course pets) – So, that seems to go against filling your fridge with ozone since the fridge us usually where food is stored. Any thoughts on this?

  7. Avataaar/Circle Created with python_avatars janusz0 says:

    When I was a microbiologist, I looked at Ozone for surface sterilisation. It works, but remember this warning: "If you can smell Ozone, it's doing you harm".

  8. Avataaar/Circle Created with python_avatars sparkplug1018 says:

    Its built with logical circuitry, this means that probably in about 6 months we will see Clive tearing one apart that has been stripped bare of any logical design and built down to the absolute bottom of the barrel cost.

  9. Avataaar/Circle Created with python_avatars darkside274 says:

    Odds are somebody, Somewhere on this vast planet, Has jammed one of these things right up inside their backside, Resulting in many hours of painful spudgeing down at the local Emergency Room.

  10. Avataaar/Circle Created with python_avatars Ray Mitchell says:

    Thanks for the fair warning, I have enough tedious hands free that doesn't simple start with the low-voltage organic lemons I get from Whole Foods… P.S…. oh wait… I think they are real lemons, never mind! 😁

  11. Avataaar/Circle Created with python_avatars tschuutschuubahn says:

    Available scientific evidence shows that, at concentrations that do not exceed public health standards, ozone is generally ineffective in controlling indoor air pollution.

    The concentration of ozone would have to greatly exceed health standards to be effective in removing most indoor air contaminants. In the process of reacting with chemicals indoors, ozone can produce other chemicals that themselves can be irritating and corrosive.

    When inhaled, ozone can damage the lungs. Relatively low amounts can cause chest pain, coughing, shortness of breath and throat irritation.

  12. Avataaar/Circle Created with python_avatars primate interface technologies says:

    good sir- it is in fact, true, that there is no way, or time, in which a title like that one does not demand my attention…
    peace. from the good 'ole US of "hey- we didn't all vote for him" A.

  13. Avataaar/Circle Created with python_avatars Niall Tracey says:

    I suspect that the whole "ecological" waffle is mistranslation for the fact that it's a "white label" product, logic being it's made for the marketplace, which is an "ecosystem"

  14. Avataaar/Circle Created with python_avatars Scott H says:

    What are the ebay keywords for this device?
    I tried "xiaomi ozone egg" and it gave me lots of watches and phones ?!
    "Xiaomi high voltage refrigerator lemon" gives me detox drinks and T-shirts… imagine that, a high-voltage T-shirt.

  15. Avataaar/Circle Created with python_avatars midinotes says:

    Electronics these days are getting so boring, microcontrollers now in just about everything! Even to flash an LED these days, it’s cheaper to use a microcontroller than discrete circuitry.

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