The reason why the ignition coil can change the low voltage of the vehicle into a high voltage is because it has the same form as the ordinary transformer, and the turns ratio of the primary coil to the secondary coil is large. However, the working mode of the ignition coil is different from that of the ordinary transformer. The ordinary transformer is continuously operated, and the ignition coil is intermittently operated. It repeatedly performs energy storage and discharge at different frequencies according to different engine speeds.
When the primary coil is powered on, a strong magnetic field is generated around 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 is rapidly attenuated, and the secondary coil is Will induce a very high voltage. The faster the magnetic field of the primary coil disappears, the larger the current at the moment of current disconnection, and the higher the turns ratio of the two coils, the higher the voltage induced by the secondary coil.