Overvoltage protection (varistor, Metal Oxide Varistor)

Overvoltage protection (varistor, Metal Oxide Varistor)

The main function of over-voltage protection of the varistor (Varistor), unusual high voltage or static electricity when the electronic circuit of the electronic products, high voltage varistor will be reduced to the value of safety standards, in order to prevent the main components and IC damaged.

Varistor is mainly composed of metal oxides such as zinc oxide, bismuth oxide sintered nonlinear elements. Its characteristics when the circuit exceeds a certain voltage, its resistance to instantly minimization. When the surge comes will surge current from the component itself and grounded to avoid the other components surge infringement and effective in reducing noise interference, the electrical proper functioning.

Because it can protect electronic products or components immune to the impact of switching or lightning induced surges, coupled with the small size, fast response. Varistors are widely used in portable electronic equipment, measuring equipment, handling equipment, home electronic appliances, audio-visual equipment, and other electronic devices. Use of electronic products compared with thermistor, such as a mobile phone is about to use a thermistor, varistor(Metal Oxide Varistor) may spend 8-40.

Temperature sensor

Photoresistor (Light Dependent Resistor) mainly composed of cadmium sulfide (CdS) or cadmium selenide (CdSe) material, these materials have a characteristic, when exposed to light, its resistance value will decrease. Because the light source can make the material where electrons from atoms become free electrons, the increase of the free electrons, will improve conductivity of the material, so that its resistance value decreased.

In recent years the humanoid robot bionic rapid development of Japan has developed the surface clouds sensor artificial electronic skin that can sense the pressure of external objects. Robot skin in the near future will be the same and the skin feel, this artificial electronic skin coverage on the fingertips of the robot, the robot can be, like people, have a very sensitive sense of touch. If the pressure sensor is converted into a temperature sensor, then the robot will be able to sense temperature changes.

Protection components Colour

In our daily life in many electrical and electronic products use a fuse or protective element role is to protect the product and avoid danger. Danger to consumers because the product, the manufacturer is likely to be the recovery of huge compensation to pay a high cost recovery. Protective element main function is to protect the circuit of electronic products, its main components and IC, etc., when the unusual condition of current or voltage, it is possible to automatically discontinue the supply or will automatically excessive voltage to a safe value, in order to prevent the parts of the product by damage and fire occurred, the concept is somewhat similar to the function of the fuse. Overcurrent protection (thermistor,(Metal Oxide Varistor) )