Introduction to the principle and role of automotive relay radio frequency filter

　　Electromagnetic relays are generally composed of iron cores, coils, arms, contact reeds. As long as a certain voltage is added to both ends of the coil, a certain current will flow in the coil, which will generate electromagnetic effects. Auto relay, principle, action, movement contact and static contact (frequent opening contact) suction. When the coil is broken, the absorption of the electromagnetic disappears will also disappear, and the iron will return the original position at the reaction force of the spring, so that the movement contacts and the original static contact (normally closed contact) are released. Such suction and release, thereby achieving the purpose of piloting and cutting off in the circuit. For the "constant opening and normal closed" contacts of relay, you can distinguish the static contacts of the car relay, principle, and role: the relay coil is not powered on, called the "frequent opening contact"; The static contact of the state is called "normal closed contact".

　　If it is applied to a car, the technical technology of the car controls the relay requires the car relay, the principle, and the effect is harsh, because it must adapt to the harsh environment such as vibration, high temperature, low temperature, humidity, and oil, salt, and water. Small, low consumption, and at the same time have the performance of electromagnetic compatibility, flame retardability, fast response speed. It really wants to run, and the horses do not eat grass. As a car control relay, automotive relay, principles, and action, it must meet these requirements.

　　Taking commonly used car light control relay as an example, there are mainly three -foot, four -legged and five -foot control relay. Control the headlights, front lights and instrument lights, turning lights, rear lights, brake lights, reverse gear lights, fog lights, carriage lighting, etc. When the combined automotive relay, the principle, the function switch is allocated to the headlight ON gear, the control system of the headlight relay (part of the magnetic field coil) will be powered by the magnetic field. The alloy contacts are closed immediately. The headlights are turned on. When the combined switch is dial to the large light OFF file to break the power supply, the magnetic field disappears causes the control alloy contact to separate immediately.

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