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The structure of ignition coil：
The usual ignition coil contains two sets of coils, the primary coil and the secondary coil. primary coils use thicker enamelled wire, usually around 200-500 turns with about 0.5-1 mm enamelled wire; secondary coils use finer enameled wire, usually around 15000-25000 turns with about 0.1 mm enamelled wire. A primary coil is () connected to the vehicle's low-voltage power supply at one end and a switch (breaker) at the other end. One end of the secondary coil is connected with the primary coil, the other end is connected with the output end of the high voltage line to output high voltage electricity.
Working principle of ignition coil ：
The ignition coil can convert low voltage to high voltage. It has the same form as ordinary transformer. The primary coil has more turns than the secondary coil. However, the working mode of ignition coil is different from that of ordinary transformer. The working frequency of ordinary transformer is fixed 50 hz, also called power frequency transformer, while the ignition coil is working in the form of pulse, which can be regarded as pulse transformer, which repeatedly carries out energy storage and discharge at different frequencies according to the different speed of engine.
when the primary coil is connected to the power supply, a strong magnetic field is generated around the increase of the current, and the core stores the magnetic field energy; when the switching device disconnects the primary coil circuit, the magnetic field of the primary coil attenuates rapidly, and the secondary coil induces a very high voltage. The faster the magnetic field of the primary coil disappears, the greater the current at the moment of current disconnection, and the greater the turn ratio of the two coils, the higher the voltage induced by the secondary coil.