How to make a simple induction heater

An induction heater is a device that works using the magnetic properties of metals. Making it yourself is very simple. The device will be useful not only for studying the basics of electrical engineering, but also for practical purposes, for example, for hardening parts. After a little modification it can be used to assemble a home heater.
How to make a simple induction heater

Required Parts


To assemble an induction heater we will need:
  • copper wire with a diameter of 1-1.5 mm;
  • 2 field-effect transistors IRF44N with radiators;
  • a set of capacitors with a total capacity of 2-2.5 microfarads;
  • 2 resistors with resistances of 10 Kom and 470 Ohm.

There are no strict requirements for details. Instead of those indicated, you can use any N-channel field devices with a similar pinout and a current of at least 10 A. The dissipation power of the input resistors R3 and R4 is 2 W, with a resistance spread of 100 - 620 Ohms.
The induction heater circuit is shown below.
How to make a simple induction heater

Induction heater assembly process


The circuit is quite simple, so we will assemble it using a hinged installation. We will subsequently fix all the elements on a small wooden block.
Let's prepare the details.If you don’t have resistors of the required values ​​at hand, you can connect two in series.
Remember! When resistors are connected in series, their power remains unchanged. If you are replacing R3 or R4 with multiple resistors, make sure that all parts have the required power dissipation.
How to make a simple induction heater

Let's make an inductor. On a smooth steel rod with a diameter of 70 mm, we wind 3 turns of copper wire, leaving straight sections at the ends for the terminals. You need to make two such coils.
How to make a simple induction heater

We solder together two terminals of the coils, which form a common point.
How to make a simple induction heater

To make inductor L1, you need a thinner rod, with a diameter of 20-25 mm. Let's wind 10 turns of wire. For ease of installation, we will make sure that the terminals are located in opposite directions.
How to make a simple induction heater

Let's install the transistors on the radiators, lubricating the inside of the case with thermal paste.
How to make a simple induction heater

Let's assemble a capacitor bank of the required capacity by connecting them in parallel. As conductors we use the same copper wire that was used to wind the inductor.
Let's shape the terminals of the transistors: carefully bend the leftmost leg to the left, and bend the rightmost leg forward.
How to make a simple induction heater

Let's connect the central terminals of the transistors to a capacitor bank.
How to make a simple induction heater

Let's connect the source of the first transistor (the rightmost terminal) to the source of the second with a jumper. Leave a small piece of wire for further installation.
How to make a simple induction heater

Solder the resistors according to the diagram.
How to make a simple induction heater

On the other side of the capacitor bank we install an inductor, the middle terminal of which is connected to the inductor.
How to make a simple induction heater

Let's install the power terminal block. The “positive” wire will go to the free end of the inductor, the “minus” wire will be connected to the jumper between the right legs of the transistors.
How to make a simple induction heater

The device is ready for use. If you place a metal object in the inductor coil, it will quickly heat up.The coil itself will not heat up.
How to make a simple induction heater

Watch the video


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Comments (10)
  1. Radion
    #1 Radion Guests February 19, 2020 00:35
    2
    It would be nice to get data on power currents and frequency voltage quality factors.
  2. Gate voltage
    #2 Gate voltage Guests 19 February 2020 01:03
    4
    The voltage at the transistor gates is almost double the supply voltage. For most transistors, the maximum allowable gate voltage is +- 20 volts, for some +-30 volts. Therefore, when powering the circuit from 35 volts, there will be 70 volts at the gates, which is guaranteed to damage the transistors.
    Conclusion: the circuit is inoperative.
    1. Guest Valentin
      #3 Guest Valentin Guests 19 February 2020 16:10
      5
      The video is taken from a Portuguese source. If you look closely at the installation of the circuit, you will notice that the coils L2 and L3 are wound towards each other. The circuit will operate when powered by 12-13 Volts, in this case from a car battery. Wire on coils D-2...2.5mm. IRFZ 44N transistors are available on ALI for about 1.5 USD for 10 pieces.
  3. Boot
    #4 Boot Guests 23 February 2020 10:17
    1
    Can this thing be adapted for water heating?
  4. Vyacheslav
    #5 Vyacheslav Guests 5 March 2020 22:47
    2
    It's not clear about capacitors. A bank of capacitors is written, but how much should the resulting capacitance be, the voltage of the capacitors. Write, who repeated this scheme, is it viable?
  5. Dmitriy
    #6 Dmitriy Guests December 9, 2020 11:28
    4
    Is it possible to adjust the power adjustment?
  6. Alina Rinatovna Sagitova
    #7 Alina Rinatovna Sagitova Guests February 13, 2021 01:18
    0
    this scheme doesn't work, it's fake, don't waste your time
    1. Well
      #8 Well Guests 13 February 2021 10:07
      0
      works, no need
  7. Guest Sergey
    #9 Guest Sergey Guests January 24, 2022 09:46
    1
    what capacitors to use? With capacitance it’s clear, but with voltage, there is no detailed characteristics of capacitors
  8. Nemo
    #10 Nemo Guests 16 February 2022 22:21
    0
    The diameters of the coil and choke are indicated incorrectly.