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How the induction coil works

The working principle of the induction coil is mainly based on the phenomenon of electromagnetic induction and self-induction.

Electromagnetic induction:
When intermittent DC current flows through the primary coil regularly, a changing magnetic field will be generated around the primary coil. This change in the magnetic field will generate an electromotive force inside the coil, that is, an induced electromotive force.

Self-induction phenomenon:
When current passes through the coil, the magnetic flux inside the coil changes, creating a constant magnetic field in the coil that is independent of the frequency and direction of the current. This constant magnetic field is called the original magnetic field.

Mutual induction:
When the current in the primary coil changes intermittently, the secondary coil will also induce corresponding voltage fluctuations. This is because the change in the magnetic field generated by the primary coil affects the secondary coil through the mutual inductance effect.

In the ignition system of a gasoline engine, the induction coil can generate a voltage high enough to trigger the spark plug, allowing the engine to burn fuel properly.

To sum up, the working principle of the induction coil is to generate a changing magnetic field through the intermittent DC current in the primary coil, thereby generating an electromotive force in the coil, and generating high voltage in the secondary part of the coil through the mutual inductance effect, which is used in different applications. Application requirements, such as ignition systems or generating high voltage electricity, etc.