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About the desulfation of car batteries



Inspired by the theme "Desulfator - a device for the" treatment "of batteries" and recent events in my life. I'll start from afar.
... Once, a long time ago, an old friend came up to me, a slender and curly-haired owner and at the same time a small worker, for two workers, a service station, and asked me to mold a desulfator (hereinafter DS) according to the scheme he brought. I looked at the little shepherd, grimaced and refused. He did not persuade, but kicked the bag he had brought with him, it clinked there and I took up the soldering iron.

... The other day, the same friend, a fat and bald owner of a service station, a gas station and a hotel for long-distance fighting, was driving up and asked to blind another DC, the wagon drove through the old one. I began to fight back, he did not persuade, only rustled with green papers, and I took up the soldering iron.

Morality - professional motorist with great experience and experience, this thing is needed, it means it works, and, most likely, not bad.

So how does it work (quotation assembly).



About the device diagram.
The original schematic from the Radiokot site, cited and further developed by borodach and a little by me.


There the generator was assembled on a 555 timer, it wasn’t at hand, therefore, like Pugacheva’s: “I blinded it from what it was ...”, on 561LA7 according to the scheme with the possibility of PWM regulation.

About the desulfation of car batteries


The process of working out the scheme on the layout.
Result.

PWM works. Why such a garden? The scheme that we will consider later works as follows. way - during the opening of the key on the field effect transistor (hereinafter referred to as PT), current flows through the inductors and energy is accumulated in them, which at the moment of closing the PT (sharp!) is released in the form of a high-voltage (relatively) surge applied to the battery. Adjusting the duty cycle allows you to optimize these things. I don’t know how. The battery man who does this is muttering about a pulsed voltmeter and current clamp, but, in my opinion, he is doing this with the help of the great master TYK.
And here is the whole scheme

The generator on K561LA7 with PWM regulation, the driver on KT630, the key on the field, everything is clear.

Tools and materials.


Conventional bench and mounting tool.
Everything is clear about the details according to the scheme, windings are roughly matched from the wreckage of switching power supplies using an inductance meter.
Design begins with the choice of housing.


For a single product, it makes no sense to develop and manufacture a printed circuit board (PCB), this is a workhorse, not an exhibition copy, we assemble on a breadboard.

PP at the assembly stage.Further photos were partially skipped due to low information content.
We try to put in the case.


The blank of the back plate is not yet trimmed.
And finally - assembled, check.

We tested the device on the battery from my (!) Screwdriver, which is why it died irreversibly by morning. Es-but, my antipathy to this device only intensified.

The fate of the product. The owner shook the case with scotch tape, lamented that the output wires were thin, it was necessary to be a little finger thick, hooked on heavy brass terminals. A couple of days after he took the DS, I call to find out the details. The answer is that everything is fine, everything works, do not bother.

And a little addition.
Once, when the chargers were made on biscuits and transistors, there was an undeservedly forgotten circuit with the functions of charging and desulfation.


Here, the rectifier is assembled according to the bipolar scheme, but the negative cable is taken as the common one. It turned out a two-level rectifier, from a lower voltage (it is possible without smoothing), an ordinary charger is powered, including possibly thyristor, from the larger - DS. The power of the DS pulses is determined by the second capacitor (and, of course, by the voltage on it). Generator - a conventional multivibrator with amplified output, differential. the chain C2, R2 generates short pulses that are fed to the battery through the P210Sh key.
Well that's all, comment.

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18 comments
Author
Somehow they sat with a friend, drank, and figured that he had more than one and a half lem assets. Who do you believe, or what?
Author
[quote = Oleg Borodinov] I have already commented on a similar article on the topic of desulfatization,

where and what next?
Oleg Borodinov
I have already commented on a similar article on the topic of desulfation, where I pointed out that the authors of this method were very late with their proposals for about 30 years. Modern car batteries are very different from Soviet ones and desulfation will simply disable them, the sediment will clog the usable volume between the plates, reducing most battery capacity.
Author
I got a grasp of your (I apologize for familiarity, no offense!) Post, I wanted to talk, albeit belatedly.
... ... 100% in favor, but I only do them, others are exploiting, the conclusions are based on their reviews.
... ... Abizhayesh, the beginner! nea
... ... Desulfation and training, IMHO, different things (?). read
... ... I have a bigger score.
... ... I had 90, from some combine harvester, I got dry-charged, I shoved it into Moskvich at that time. For several years, he only added water, and somehow, being a tad, he drove 100 meters on the starter and threw it for a couple of days. All, no dancing with a tambourine did not help, he died. negative
... ..Now - yes, I agree, but there were times of terrible shortage.
Basil
A modern battery has a life of 3 years, on average. This term, almost, does not depend on anything, at least follow him, at least do not follow. As a result, you have to buy a new one, especially for lovers of winter riding in the cold .. Well, if you want, you can, of course, bother and experiment. But, this is a hobby, for a competent lover ..
"And you could play a nocturne on a flute of drainpipes?" ))))
It is clear that the songs must be fed directly to the battery terminals, but in what polarity?
- I will try to write to British scientists, let them unsubscribe-)))
pogranec
songs of Alla Pugacheva and Alenka Apina affect desulfation
It is clear that the songs must be fed directly to the battery terminals, but in what polarity? scratch
Author
Quote: pogranec
- British scientists have proved that how the broadcasts in Beethoven’s barn influence the milk yield, the songs of Alla Pugacheva and Alenka Apina affect the desulfation

... what are you ?! and men don’t know ... smiles xaxa
But what relation do Pugachev and Apina have to the desufation of car batteries? What do you mean? They are definitely not doing this. xaxa xaxa xaxa
... Well, yes ... They're married! husbands desulfate them, probably! ...))))
P.S. Once in the village I accidentally overheard a conversation of grannies at the TV. The program was about some famous tennis player. (It seems about Martina Hingis, but I could be wrong. “Voice-over” mentioned that she is very rich. Then they said that she is fond of horses and has two, or three horses of her own! ...
Then the grandmothers nodded in satisfaction, saying: “Of course there will be rich! Three of their horses” Well, to whom to plow, to whom to defend! ... And all for pennies! ".... ok
vmzsoft, and what relation do Pugachev and Apina have to the desufation of car batteries ?.
- British scientists have proved that how the broadcasts in Beethoven’s barn influence the milk yield, the songs of Alla Pugacheva and Alenka Apina affect the desulfation
vmzsoft, and what relation do Pugachev and Apina have to the desuffatation of car batteries? What do you mean? They are definitely not doing this. xaxa xaxa xaxa
Author

vmzsoft
Perhaps sorry, if so. I was somehow more interested in Gilan and Blackmore ...
like Pugacheva’s: “I blinded him from what was ...”

Pugacheva never sang this vulgarity.
This was sung exclusively by Alena Apina ...
Quote: Khatul Madan
to collect and find out for yourself, in a pinch it will be just a charger.

Collecting and finding out is the best option. This scheme is quite working, but it closely resembles the story of Baron Munchausen, how he pulled himself out of the swamp by the hair.
Theoretically, desulfation is achieved not due to shock currents, but due to charge / discharge cycles. Moreover, with a certain ratio of currents. I collected 6 different pieces of such training devices. They differed only in the elemental base, and the principle of work is the same for all. And now there is a Cedar-10 Automatic with such a function. Only in the "Cycle" mode does the automobile lamp need to be connected to the battery. The longest time I served was a Tyumen 6ST75 battery, serviced in a black case from October 2010 to August 2018. He turned the Chrysler engine on the Volga. Never been subjected to a cyclic charge. But the Korean batteries, which were equipped with all Chevrolet (Lachetti, Aveo, Epica, etc.) served exactly 2.5-3 years and in the trash, despite all the dances with a tambourine around them - constant recharging, desulfation.
Impact pulses (as in this design) are trying to reanimate dead batteries that do not take charge, do not increase density, and boil after 5-10 minutes. It is with these impulses that they are trying to somehow destroy lead sulfate and gain electrolyte access to lead itself for the normal charge process to occur.
In general, pampering all this ...
That is what I had in mind about stories on the Internet. The screwdriver batteries as soon as they are not restored there, they are shoved into the freezer, and then they are beaten with a mallet, and separately connected to the starter battery (12 V battery) and even to the inverter welder for a short time to crush the domains with an "shock current". And everything turns out smoothly for them, but it just doesn’t work in real life. But we are talking about the desulfation of starter batteries, can anyone have real experience with specific results? In general, you need to try to collect and find out for yourself, in a pinch, it will just be a charger.
I saw on one site a circuit where Ni-Cd and Ni-MH allegedly restore one type of current pulse from a 200 uF capacitor charged to 400 V !!! I have a lot of such batteries lying around, tried to restore in different ways, but to no avail.

I did recharges for automobiles, but did not do any restoration. But I have extensive experience in restoring lead-acid batteries, also 12 V, but not serviced. I'm talking about those that are used in security systems.

Restored, but still they did not work normally (loss of capacity). So I'm skeptical about this venture. But this is my purely personal opinion.
We tested the device on the battery from my (!) Screwdriver, which is why it died irreversibly by morning.
Of course he dies, Ni-Cd or Ni-MH has nothing to desulfate. I myself have long wanted to collect a charger with this option, all hands do not reach, and until I started, it would be interesting to study this topic in more detail. What is in the internet is limited to general phrases.

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