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This is perhaps the easiest battery charger you can think of. Such a charge more than once helped me out in difficult situations. It is quite simple to assemble on your own in the absence of a soldering iron and other radio elements. Such a charger can charge the battery of a motorcycle or car in various difficult situations.


Of course, I do not recommend using such a device in everyday life, because all its parts, including the battery, are under a voltage of 220 volts that are life-threatening, and for a single use it will completely disappear, naturally, subject to elementary electrical safety rules.
Its biggest plus is the obvious simplicity of the design that does not require much knowledge in radio electronics and scarce parts. A big minus is the low efficiency.
Let's get acquainted with the charger circuit:


It has only two parts: an incandescent lamp and a diode.
When using an incandescent lamp with a power of 100 watts, the battery charging current is about 0.25 Amperes, which is enough to charge a motorcycle battery. You can also hang another lamp and get about 0.5 amperes.
Details: any standard incandescent lamp, voltage of 250 volts; any diode - voltage of 250 volts and current not lower than 0.5 A.

Here is an even more complicated diagram of this charger.


It already has four diodes or one diode bridge. Here, from one 100 Watt lamp, the current is about 0.5 Amperes. But naturally, it can be increased by hanging another incandescent lamp in parallel at the rate of 1 lamp = 0.5 A.
Calculate the power of the diodes yourself, depending on the number of lamps and a voltage of at least 250 volts.

In general, the battery should be charged 0.1 of its capacity. That is, if a rechargeable battery with a capacity of 90 amperes / hour, then the current through it should be 9 amperes. The time from full discharge to full charge will be about 10-12 hours. But usually, few people charge with such current and usually take two times less and more time.
I tell you this so that you yourself would calculate your charge time.

Personally, I had such a case. Once I arrived at the cottage and, out of awkwardness, forgot to turn off the dimensions. After several hours of work in the country, before driving, I inserted the key into the ignition switch and realized that the battery was discharged to zero. Nearby it’s not like cars, no people to ask for help. The benefit in the country was electricity. I quickly rummaged in the barn and found a Soviet board from a lamp TV. I pulled out a rectifier board with diodes from there. Well, finding a light bulb is not a problem. Gathered all twenty minutes. He removed the battery, connected everything, turned it on. (you will do this - do not mix up the sequence of actions!). I went and drank some seagull. After two or three hours, I decided to try to start it, the battery was not new, but not old. Turned off, put the battery, started. The car started up without unnecessary difficulties. Well, then let the car charging system work. And I got home without any problems.

P.S.: I want to once again draw your attention to compliance with electrical safety rules! Before all work, turn off the power! A voltage of 220 volts is life threatening!

Be especially careful!

come back
Comments (17)
  1. Granddad
    #1 Granddad Guests November 19, 2010 16:54
    3
    Is logical. +5 points for quick wits! smile
  2. Rycmuk
    #2 Rycmuk Guests June 4, 2012 4:47 p.m.
    4
    But from 220v there will not be a bad 12V battery?
  3. Serg
    #3 Serg Guests April 15, 2013 15:36
    1
    I think it's better to take exercises with you.
  4. frdgfg
    #4 frdgfg Guests May 31, 2013 20:46
    1
    Thanks for the advice!!!
  5. cop5
    #5 cop5 Guests January 25, 2014 17:10
    3
    Yes, it is likely that from such a voltage the battery may overheat
  6. amator
    #6 amator Guests June 15, 2015 12:55
    0
    [b] Rycmuk [/ b],
    Will not be. The voltage at its terminals will be within 12-15 volts - Ohm's law will take care of this. Even when using a kilowatt light bulb, the current will not exceed the nominal 5 amperes. You can only create a problem by shorting the light bulb. (I use a similar circuit with a quenching capacitor - there the efficiency is in order, but there is a real danger of breakdown.
    1. Edward
      #7 Edward Guests August 27, 2017 20:10
      2
      you can use two capacitors connected in series, the current will be two times less. and when one capacitor is broken, the second will remain in the circuit and then the current will be almost nominal. The Chinese in flashlights use a capacitor rectifier to charge a 4 Volt lead-acid battery, everything works fine. put our Soviet capacitor with a margin of voltage. for example, at 600 volts, then its figs when it breaks through. a familiar neighbor on a motor town. uses a similar circuit, two capacitors MBGCH 4MKF * 600V are connected nnye between themselves in parallel and in series with the rectifier and akkumulyatorom.Legky and compact zaryadnik.Gdeto I heard that such a scheme pulsating direct current is more favorable for the battery and allegedly eliminates sulfation plates
      1. Grigory Donetsk
        #8 Grigory Donetsk Guests December 7, 2018 19:00
        1
        There is no galvanic isolation in this circuit, so first they connect the terminals and then plug them into a socket, otherwise it will not seem a little.
  7. Gennady
    #9 Gennady Guests October 14, 2015 09:48
    1
    And if instead of a light bulb to use an air heater (TEN)? is it possible, or will it not be charged?
    1. anvar aminov
      #10 anvar aminov Visitors July 4, 2018 8:06 p.m.
      0
      the advantage of the light bulb is that as the charge on the nky will slightly decrease
      1. anvar aminov
        #11 anvar aminov Visitors July 4, 2018 8:10 p.m.
        0
        it’s a joke, of course, and some will really expect a glow
  8. Edward
    #12 Edward Guests August 27, 2017 20:03
    0
    Instead of a light bulb, you can solder an 8mkf / 400V capacitor in front of the rectifier, then you can put the entire circuit into the housing from the plug adapter. The main advantage of this circuit is that it is not afraid of a short circuit at the output.
  9. Guest Alex
    #13 Guest Alex Guests January 21, 2018 11:17
    0
    I had a similar situation. True, I used a 1 kW electric stove to charge a 60-amp battery, it turned out just on a charge of about 5 amperes. But for practical use, I would recommend this scheme only in exceptional cases and only if you are friends with electricity, as There is a serious danger of electric shock!
  10. ALEXANDER KOLICHNICHENKO
    #14 ALEXANDER KOLICHNICHENKO Guests March 3, 2018 01:04 AM
    0
    I do not understand, this is April 1
    1. Hino
      #15 Hino Guests April 5, 2018 16:41
      4
      This is physics, brother ...
  11. Nikolaevich
    #16 Nikolaevich Visitors October 14, 2018 10:19
    1
    Loaded so 16 years ago sunglasses , only without a lamp, minus the nail and the ground, and plus the diode and the socket per phase. two years did so on the old 55a battery and went
  12. ozi
    #17 ozi Guests June 6, 2019 4:08 p.m.
    0
    But the voltage: lamps - 220V, diode / bridge - at least 350V.

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