Classification and function of automotive relays


Automotive relays are generally electromagnetic or solid. The electromagnetic relay says that the coil is energized to generate a magnetic field that attracts the electric shock and fits the static contact to turn on the circuit. The current mostly used in the solid state generates electrons through the diode, and the electrons collide on an object similar to a triode. When the photoelectric intensity reaches a certain value, the triode is turned on and the next loop is turned on. Classification of automotive relays

1. According to the purpose classification, it can be divided into two types: functional type and control type relay. Flash relays such as wiper relays are functional relays, and ordinary relays that simply turn the circuit on and off are controlled relays.

2. According to the contact status, it is divided into three types: normally open type, normally closed type and mixed type.

3. According to the control method: current type and voltage type current type control relay is a relay that operates according to a certain current value; it forms a practical circuit with other components, such as a flash relay on a car, the larger the current, the higher the flash frequency. A voltage type relay is a relay that operates at a certain voltage value, and the relay turns on or off the controlled circuit when the controlled circuit voltage is greater than or less than a certain value. Such as lighting relays, horn relays, etc. The voltage relay is mainly used to control the large current consumption circuit. The coil control voltage of this relay is generally greater than 7V to work, and less than 5V will stop working.

4. According to the connection method: terminal block and plug-in type

5. According to the protection mode: resistance protection and diode protection The function of the control relay uses a small current to control large current.

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