DIY Induction Heater:
Wikipedia has described an induction heater as a “key piece of equipment used in all forms of induction heating and operates at either medium frequency or radio frequency ranges.” It is based on the use of a strong magnetic field to heat a conductive body. A DIY induction heater is one of the many things that you can make at home. This induction heater is super-efficient as it can heat up objects in a matter of minutes without producing any smoke.
The DIY induction heater works on the ZVS driver which is a very efficient oscillator circuit which creates a powerful electromagnetic field that heats up the metal. The ZVS oscillator pushes and pulls current though a coil around the object that is being heated. This constant changing of the current’s direction creates a fluctuating magnetic field. This induces many small eddy currents in the metal. All of these currents are relatively high, and because of the low resistance of the target metal, heat is generated.
Here is how to get started on a DIY induction heater:
- IRFP260 Mosfets
- Fast Diodes
- 12 volt Zener Diodes
- 220 Ohm resistors
- 10K Resistors
- 10x /.047uF capacitors
- 2x 50uH inductors
- Copper wire
- 2x Sealed Lead Acid Batteries
- Soldering iron
- Wire strippers
- Mount the ZVS( Zero Voltage Switching) on a heat sink. Make sure to isolate the metal blocks of the FETs from the heat sink. To make sure that your transistors are isolated, touch your multi-meter to the middle pin of both transistors, the drain. If you get continuity, then your FETs are not isolated.
- Make a ring of copper, and add 10 .047uF capacitors in parallel around it. This makes the combined capacitor bank have a capacitance of .47uF, with lots of surface area for air cooling. This capacitor bank will be in parallel with the work coil.
- To make your coil, use stranded copper wire, and wrap it around a piece of PVC pipe about 9 times.
- Follow the above circuit diagram. Take the Zener Diode and twist it together with the 10k resistor. Take this pair of components and solder it between the gate and ground of the mosfet. Make sure that the black end of the zener diode faces the gate. Then, solder the mosfets to a piece to perf board. Use the bottom side of the perf board to solder two fast diodes between the drain and the gates of each fet. Make sure that the white line faces the drain. Then, attach the VCC wire -from your power supply- through 2 220 ohm resistors to the gate of each transistor. Ground both sources. Then, solder the work coil and capacitor bank in parallel with each other and solder each end to a different drain. Finally, run power to the drains of each mosfet through 2 50uh inductors.
- Use a piece of 2 X 4 wood and glue the circuit board, capacitor bank and the work coil to it.
- Connect the induction heater to power supply and your DIY induction heater is ready to roll!!
Careful placement and application will give you flawless results when making a DIY induction heater otherwise trial and error is the best way with electronics.