Will the car battery voltage low relay suck and break from time to time?

The low voltage relay of the automobile battery will be sucked and interrupted, because when a certain voltage or current is added to the two ends of the electromagnetic relay coil, the magnetic flux generated by the coil passes through the magnetic circuit composed of the core, yoke, armature and magnetic circuit working air gap, and under the action of the magnetic field, the armature is sucked to the core pole surface, thereby promoting the normally closed contact to be disconnected and the normally open contact to be closed; When the voltage or current at both ends of the coil is less than a certain value, when the mechanical reaction force is greater than the electromagnetic attraction, the armature returns to the initial state, the normally open contact is disconnected, and the normally closed contact is connected.

Then, the automotive relay can be regarded as a combination of two parts: the control circuit working by the coil and the main circuit working by the contact. In the control circuit of the relay, there is only a small working current, which is due to the small contact capacity of the control switch, which cannot be used to directly control the load with large power consumption, and can only control its on/off through the contact of the relay.

A relay is both a control switch and a control object (actuator). Take the fuel pump relay as an example, it is the control switch of the fuel pump, but the coil of the fuel pump relay can only form a loop through the grounding point of the electronic control unit when the triode is turned on in the electronic control unit.

Relay is an automatic control device that changes by leaps and bounds when the input quantity (electrical, magnetic, sound, light, heat) reaches a certain value. The automotive relay is a relay used in automobiles, which has high switching load power and high impact and vibration resistance. The power supply in the car is mostly 12V, and the coil voltage is mostly designed to be 12V.

Because it is battery powered, the voltage is unstable; The environmental conditions are harsh, and the suction voltage V 60%VH (fixed working voltage); The coil overvoltage is allowed to reach. The power consumption of the coil is large, and the temperature rise is generally high. The environment is quite demanding:

In the engine compartment, the ambient temperature range is required to be -40 125, and in other locations the ambient temperature range is -40 85; Relays used in the engine compartment should be able to withstand sand, dust, water, salt and oil; Vibration and shock are quite harsh.

Hello, if the voltage is very low, and then just reach this critical value, the relay will be sucked and broken.

An official database of Hebei Normal University I mobile phone documents.

This is not possible, if this happens, please change it from a few o'clock.

The working principle of the relay is to use the magnetic force of the electromagnet composed of coil and silicon steel sheet to make the contacts combine and turn on the current when the electromagnet is applied. When the voltage is unstable or too low, the suction of the electromagnet will become smaller and unstable, and when the suction is reasonably small, the spring of the steel sheet where the contact is located will bounce up the steel sheet, and the contact will be separated, so the relay will continue to close.

Because the voltage is too low, the normal working voltage of the relay cannot be reached. The voltage is in a critical state of pick-up and release.

The voltage is directly proportional to the electromagnetic flux.

If the voltage is too low, the relay cannot reach the required magnetic field, and a step-up transformer can be added to the AC one. It can be solved, 380V to 450V,

If the magnetic force is not enough, it also indicates that the voltage is unstable.

Solution, if the line is far away, increase the wire diameter.

Or separate power supply and add a power module.

In the national standard, the pick-up voltage of the relay is less than 80% of the rated voltage, and the relay of 12V is less than, that is because the coil of the relay will be heated, and the resistance will increase when it is heated, and the power of the relay coil will be reduced, resulting in the reduction of the suction power of the coil, which is manifested as the increase in the pick-up voltage, if the pick-up voltage of the relay is too high, it may lead to the relay not being suctioned, or the staking is not reliable, and the contact will be high-frequency on-off when the relay is vibrated by external force, resulting in the ignition of the relay and the failure of the whole machine. If applied to the car, the relay suction voltage requirements will be lower, generally do the following, because the car is powered by a battery, the voltage of the battery is unstable, and the instantaneous voltage of the car is very low, so the relay suction voltage used on the car is lower.

Only aging batteries will have this possibility, of course, they should also be replaced immediately to avoid potential safety hazards.

As long as the battery is not charged, it cannot be recovered.

Automobile battery plus booster relay is not a good thing, auto parts are actually assembled according to the results of research and development during production, all parts are developed in combination with their own situation, the voltage used in the battery is also the voltage range suitable for the motor, increasing the voltage of the battery will only bring greater loss to the motor, shorten the service life of the motor, etc.

As long as you are creative, it is still easy to make money.

If it is necessary to install these things, why don't manufacturers make this profit?

Hello, no, adding a voltage regulator can do a little trick.

If the voltage drops during operation, check the performance of the battery, or check whether the coil is short-circuited.

If the coil voltage is normal, then it is necessary to see if there is a problem with the coil itself;

Or whether there is debris on the surface of the magnet, oil, etc.