12V Induction Coil using P55NF06 with UTSOURCE

Induction coils are used in a variety of applications from home appliances to industrial furnaces. Each and every appliance use induction coils uses the same principle no matter what scale they operate. Today we are going to build a very basic induction coil using 12V supply and few components. This circuit is bare minimum induction coil circuit as it only have the driver circuit. In practical situations, these driver circuits will accompanied with protection circuits, limiter circuits, and feedback loops etc. This circuit does not have such protection or feedback circuits, however, it will function just fine. We are going to use a MOSFET transistor as the main switching device in this circuit. We are going to use P55NFO6 N-Channel MOSFET with some other components. You can see the physical appearance of the P55NFO6 transistor and it’s pinout.

Main Components :

We need the following supplementary components other than the P55NFO6 MOSFET.

1. 10kΩ resistors

2. 330Ω resistors

3. BC547 Transistor

4. IN4007 Diode

5. 1uF capacitor

6. P55NF06 Transistor

7. Circuit wire

Tools Needed:

1. Soldering Iron

2. Iron Stand

3. Flux

4. Nose pliers

Circuit Diagram:

This is the basic circuit of the induction coil circuit. As you can see both gates are connected to the 12V supply through a 330Ω resistor. Also both gates of the P55NF06 are pull down to ground through a 10kΩ resistors. Drains of the P55NF06 transistors are connected to the ends of the coil. Also two IN4007 diodes have connected to the gates and proceeding transistor’s source.

Step By Step Guide:

Step 1: Arrange the components

Step 2: Solder 10kΩ resistors across the gate and the source pins of the two P55NF06 transistors

Step 3: Connect the two ends of the copper coil to the drain pins of the P55NF06 transistors.

Step 4: Solder the two IN4007 diodes as shown in the circuit diagram.

Step 5: Solder two 330Ω resistors as shown in the circuit diagram one end of these resistors should be shorted together.

Step 6: Solder the capacitor to the two ends of the copper coil.

Step 7: Complete the rest of circuit using circuit wires and power it up. The circuit is now ready you can test it by inserting a iron object inside the copper coil.

How It Works:

The resistors and capacitor are configured to create a resonating tank circuit. This will cause a pulsating signal to generate. When one transistor is triggered IN4007 diodes will pull down the other transistor’s gate to ground causing two transistors to switch alternatively. This high frequency switching will cause the induction effect.

Conclusion:

You can use this circuit to heat up small iron objects fairly quickly. The end of the coil may have nearly 100V AC, so always disconnect the power before troubleshooting.

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