What is the Principle of Ignition Coil?

As a Saic Head Lamp Manufacturer China, share with you. With the development of automobile gasoline engines in the direction of high speed, high compression ratio, high power, low fuel consumption and low emissions, traditional ignition devices are no longer suitable for use. The core components of the ignition device are the ignition coil and the switch device. By increasing the energy of the ignition coil, the spark plug can generate a spark with sufficient energy. This is the basic condition for the ignition device to adapt to modern engine operation.

Saic Ignition Coil

There are two sets of coils in the usual ignition coil, the primary coil and the secondary coil. The primary coil uses thick enameled wire, usually about 0.5-1mm enameled wire around 200-500 turns; the secondary coil uses thinner enameled wire, usually about 0.1mm enameled wire around 15000-25000 turns. One end of the primary coil is connected with the low-voltage power supply (+) on the vehicle, and the other end is connected with the switch device (breaker). One end of the secondary coil is connected with the primary coil, and the other end is connected with the output end of the high-voltage line to output high-voltage electricity.

The reason why the ignition coil can turn the low voltage on the car into high voltage is because it has the same form as an ordinary transformer. The primary coil has a larger turns ratio than the secondary coil. But the working mode of the ignition coil is different from that of the ordinary transformer. The working frequency of the ordinary transformer is fixed at 50Hz, also known as the power frequency transformer, while the ignition coil works in pulse form, which can be regarded as a pulse transformer. It depends on the engine. The rotational speed repeatedly stores and discharges energy at different frequencies.

When the primary coil is connected to the power supply, a strong magnetic field is generated around the iron core as the current increases; when the switch device disconnects the primary coil circuit, the magnetic field of the primary coil decays rapidly, and the secondary coil A very high voltage will be induced. The faster the magnetic field of the primary coil disappears, the greater the current when the current is disconnected, and the greater the turns ratio of the two coils, the higher the voltage induced by the secondary coil.

Saic Ignition Coil is divided into two types: open magnetic and closed magnetic according to the magnetic circuit. The traditional ignition coil is an open magnetic type, and its iron core is laminated with silicon steel sheets of about 0.3 mm, and the iron core is wound with secondary and primary coils. The closed magnetic type uses an iron core shaped like III to wind the primary coil, and the secondary coil is wound outside. The magnetic line of force forms a closed magnetic circuit by the iron core. The advantages of closed magnetic ignition coils are less magnetic leakage, low energy loss, and small size. Therefore, closed magnetic ignition coils are commonly used in electronic ignition systems.

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