Electronic desulfator
Everyone who has ever wondered why the battery fails, knows that most batteries fail due to sulfation of the plates. All lead-acid batteries are susceptible to this phenomenon.
I was surprised at the simplicity of battery restoration with the electronic desulphator. In fact, all manipulation was to connect the miracle device to the battery and the restoration of sulfated plates began. And it was not even necessary to remove the battery from the car, unscrew the plugs of the cans for drainage of excess gas and perform any other actions. It is not even required to connect the charger. And there is almost no need in control – you just attach the terminals and go about your business, and the device will do everything by itself. Thanks to the device in question, you can not only restore your battery, but also carry out preventive maintenance on batteries that are still in service. Thus you will prolong their service life for years.
How the desulfator works
The desulfator is powered by the battery it restores. Through the same supply circuit it generates reverse short powerful pulses of high frequency. It has long been known that such pulses resonate lead sulfate molecules, resulting in the reverse process – desulfation and the battery restores its capacity and resistance. Of course, this method of restoration has its disadvantages: not all batteries can be restored, but about 85 percent. And that, I tell you, is a very good chance to try this method. Another minus is the very long process of recovery, which can last from one day to one month.
The desulfator circuit
The master oscillator is built on a 555 chip and generates short pulses with a frequency of 1-3 kHz. The elements C1 and R3 filter the voltage and make sure that the oscillator works properly. The output of the microcircuit is loaded on a transistor, which commutates inductances. In the coil L1 just there is a powerful short pulse after the transistor closes. This pulse is fed back into the battery through diode D1 and capacitor C4. Details: C1, C4 – the capacitance is specified in microfarads. C1 is better to take 300 µF instead of 30 µF. C4 is better to make a compound, connecting in parallel 4 capacitors of 22 uF, because it has a very large load. The inductances L1 and L2 are wound on ferrite rings. It depends on the permeability of the magnetic core and the diameter of the ring. I have L1 with about 45 turns of 0.8 mm wire, and L2 with 70 turns of such wire. In general, I recommend using an inductance tester when winding the coils. The rings can be taken from unwanted computer power supplies. D1 is any powerful one for 15-25A.
How to assemble the desulfator
I built the circuit on a breadboard and soldered jumpers with pieces of wire from below. I put the transistor on a small heat sink. Then I mounted this board in a homemade case. Of course the dimensions are too big and the device could be made much more compact.
Checking the operation of the desulfator
The desulphator should preferably be connected to the battery through a fuse, about two amps. Although the strength of the pulses is much greater, but their duration is not long enough to blow the fuse. After connecting the device, you should hear a faint beep, indicating the normal operation of the device.
The final test can only be done with an oscilloscope. To do this, first connect the probes to the input of the transistor (green diagram). After making sure that the oscillator works, you can connect the probes in parallel to the output of the device (yellow diagram). And you will see periodic peak pulses, indicating the normal operation of the desulphator. At the peak these pulses are up to 30 V, at the terminals of the battery itself. And the current strength fluctuates between 15-25 A.
Battery recovery process
Before restoration, it is advisable to fully charge the battery. If you are going to restore the battery standing on the car, be sure to remove one of the power terminals of the car, so as not to damage the electronics of your car. Then connect the desulfator and wait. The waiting time is always individual. You only need to periodically check the battery – measure the voltage to prevent complete discharge. Voltage measurement must be performed with the desulphator disconnected, this is mandatory. The maximum result can be obtained only after 4 weeks of continuous operation of the desulphator. Although the device is self-contained, I do not recommend leaving it unattended.
Chinese Desulphator.
Ali Express you can buy a ready to assemble kit, see – TUT . Or a completely finished device, see – TEXT .
