Simple 12V Induction Heater

A simple induction heater consists of a powerful high-frequency generator and a low-resistance coil-circuit, which is the load of the generator.
Simple 12V Induction Heater

A self-excited generator generates pulses based on the resonant frequency of the circuit. As a result, a powerful alternating electromagnetic field with a frequency of about 35 kHz appears in the coil.
If a core of conductive material is placed in the center of this coil, electromagnetic induction will occur inside it. As a result of frequent changes, this induction will cause eddy currents in the core, which in turn will lead to the release of heat. This is the classic principle of converting electromagnetic energy into thermal energy.
Induction heaters have been used for a very long time in many areas of production. With their help, you can do hardening, non-contact welding, and most importantly, spot heating, as well as melting of materials.
I'll show you the circuit of a simple low-voltage induction heater, which has already become a classic.
Simple 12V Induction Heater

We will simplify this circuit even further and will not install zener diodes “D1, D2”.
Items you will need:
1. 10 kOhm resistors – 2 pcs.
2. 470 Ohm resistors – 2 pcs.
3. Schottky diodes 1 A – 2 pcs. (Others are possible, the main thing is for a current of 1 A and high-speed)
4. Field-effect transistors IRF3205 – 2 pcs. (you can take any other powerful ones)
5. Inductor “5+5” - 10 turns with a tap from the middle. The thicker the wire, the better. Wrapped on a wooden round stick, 3-4 centimeters in diameter.
6. Throttle - 25 turns on a ring from an old computer block.
7. Capacitor 0.47 µF. It is better to collect the capacitance with several capacitors and for a voltage of at least 600 Volts. At first I took it to 400, as a result of which it began to heat up, then I replaced it with a composite of two in series, but they don’t do that, I just didn’t have any more at hand.
Simple 12V Induction HeaterSimple 12V Induction HeaterSimple 12V Induction HeaterSimple 12V Induction HeaterSimple 12V Induction HeaterSimple 12V Induction Heater

Making a simple 12V induction heater


We wind the inductor.
Winding the inductor
Winding the inductor

I assembled the entire circuit using a surface-mounted installation, separating the inductor from the entire circuit with a block. It is advisable to place the capacitor in close proximity to the coil terminals. Not like mine in this example in general. I installed transistors on radiators. The entire installation was powered by a 12 Volt battery.
Simple 12V Induction Heater

Simple 12V Induction Heater

Works great. The blade of a stationery knife heats up to red very quickly. I recommend everyone to repeat it.
After replacing the capacitor they no longer got hot. Transistors and the inductor itself heat up if they work constantly. For a short time - almost not critical.
Simple 12V Induction Heater

Simple 12V Induction Heater

Simple 12V Induction Heater

Watch the assembly and testing video:



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Comments (12)
  1. feelloff
    #1 feelloff Guests November 3, 2017 10:29
    14
    A more powerful toy
  2. Vladimir
    #2 Vladimir Guests 18 November 2017 22:09
    9
    the inductor slows down the entire circuit in terms of current, you need a blocking capacitor
    1. Toti
      #3 Toti Guests 21 July 2018 15:17
      1
      Or more precisely?
  3. NewMan
    #4 NewMan Guests 2 December 2017 13:16
    4
    What wire diameter is needed for the ring?
  4. Paul
    #5 Paul Guests 25 August 2018 15:48
    0
    For power supply, you can use a converted welding inverter
    1. Sergey
      #6 Sergey Guests 8 January 2020 18:02
      9
      I once assembled such a circuit and it works quite well, but the big minus is that you need a powerful power supply since this circuit took about 30 amperes 12 volts when heating. Therefore, I want to offer a heater with an electronic transformer that is powered directly from a 220 volt network.
      Here is the link to the article
  5. Nikola
    #7 Nikola Guests 11 September 2018 20:41
    0
    The capacitor must be placed directly on the inductor.
  6. 10baset
    #8 10baset Guests 28 February 2019 10:37
    1
    Thank you. Now I’ll do it and in winter you can warm up anywhere) I’ll come up with a housing for a mini heater)
  7. Guest Alexander
    #9 Guest Alexander Guests 4 April 2019 10:57
    2
    What is the secret, I repeated it in one word, but it doesn’t work,
    Polyviks 460 heat up, but there is no generation on the cogbutto circuit itself,
  8. Guest Sergey
    #10 Guest Sergey Guests 9 May 2019 19:05
    4
    Good evening! Please tell me what power resistors were used in the circuit?
  9. ME62
    #11 ME62 Guests May 29, 2019 10:20
    3
    The scheme is quite working.The main thing in the circuit is the transistors and the inductor, the performance and power of the heater depends on them. resistors of any power not less than 0.5W. ceramic (white square 5W would be better) but 1-2W regular ones or 10W green Sovdep ones would not be suitable, they were in players and other Soviet devices with direct power control directly from the network.. I don’t care about diodes, you can do SMD.
  10. Basil
    #12 Basil Guests 25 April 2022 12:13
    1
    To what temperature does it heat up?