Battery pulse conditioning5/2/2023 The problem is I didn't find any informations about those pulse patterns I've read about using fixed or variable frequency (in 10khz - 100khz range), 50% pwm ratio or much smaller and so on.ĭoes anyone have any experience with that? The batteries are just 1.5 years old and I don't want to loose them (though I can't explain what really happened). It's all about applying some short high current pulses during a long period (24-48h) to break down those sulfate crystals. Nevermind, I've read about some desulfator circuits that might help. Usually, this "desease" is caused by insufficient charge or deep discharge but it wasn't the case anyway (the rest of the batteries are OK). They seem to be affected by sulfation (some spongy white deposits on top of the plates). I have kind of moved on from desulfators and have focused on how not to let a battery sulfate, as in, better battery chargers.I need to recover two of my lead-acid batteries (from a large battery bank). There is a mountain of designs, information, personal experience, and success stories there, from around the world. Look for "Direct drive" and "voltage doubler". If you are interested in desulfator designs that actually work, go to the "lead Acid desulfator forum", ( ) under the "pulse charging and desulfation" section. The little inductive kickback circuits out there are a waste of time. It takes a lot of energy to convince sulfates to reform into sulfuric acid. These bogus circuits have done more to sully desulfator usage than to desulfate batteries. There are a huge number of desulfator circuits out there that are grossly under powered, producing less than 5 amps of pulse current. A $19 motorcycle battery from X-Mart is a waste of time. A battery that has sat in a shed to two years is a waste of time. The success rate varies based on battery size and construction, amount and age of sulfation, and power of the desulfator. Pulsed desulfation, where a battery is pulsed with high amperage pulses (>100 amps) will often bring a battery to a higher state of health. Failure to charge a battery correctly leads to sulfates building up and hardening on the plates and thus, early battery failure. They don't realize that a battery has to be charged is a specific way in order to maximize the conversion of sulfates back into sulfuric acid. Too many people think of a lead acid battery as a big capacitor, in that all you have to do is replace the energy you used plus some extra. "Pulse conditioning" is a far better term for what is being done to the battery. "Pulse charging" is a very poor description because there is very little charging is going on. Most of the so called "intelligent" chargers have a pulse charging mode, that applies to both nickel & lead chemistries - so far I've not bothered taking any measurements. The arrangement worked brilliantly with Ni-Cd cells, but the results with Ni-Mh were less impressive. The clamp rectifier was SB to limit the amplitude of the reverse excursions. The circuit was the basic capacitor input voltage doubling rectifier, the forward pass rectifier was the basic fast silicon so the Trr produced the required reverse spikes. In the end I used a capacitor coupling with a selected combination of fast silicon and Shottky-barrier rectifiers on the transformer output of a surplus SMPSU. Years ago I experimented with this, but found the results with 50Hz unimprssive. The same method applies to nickel chemistry, especially Ni-Cd. Putting a resistor in parallel with the half wave rectifier put a small reverse flow between each pulse of raw DC current. Originally for extending the life of zinc/carbon cells, it borrows from an electroplating technique of periodically reversing the current flow to get smooth even plating - just raw DC would plate some of the zinc back on the casing, but it was rough and granular. Click to expand.Pulse charging dates back to the 60s, the Dutch called it electrophoor.
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