The principle of the ntc chip is that the resistance value decreases rapidly as the temperature rises
NTC temperature sensor is a thermistor, probe, the principle is: resistance value as the temperature rises and rapidly decreases. It usually consists of 2 or 3 kinds of? > Composed of metal oxides, mixed in a fluid-like clay, and forged in a high temperature furnace to produce dense sintered ceramics. The actual size is very flexible, they can be as small as.010 inches or very small diameter. There is almost no limit to the maximum size, but it is usually suitable for less than half an inch.
The NTC thermistor can be used in conjunction with the AC line or the DC output of the bridge rectifier to suppress the startup surge current. The working principle is: when the power switch is turned on, the NTC thermistor is in a cold state and the resistance value is large, which can effectively inhibit the surge pulse current flowing through the resistor body. Under the double action of the surge pulse current and the working current, the temperature of NTC thermistor will rise. Because of its negative temperature coefficient characteristics, the temperature rises and the resistance value drops sharply. In the steady-state load current, the resistance value will be small, only about 1\/20 to 1\/50 of the cold state, the limiting effect on the current will be small, the power consumption is small, and the efficiency of the entire power supply will not be affected. Therefore, when used in the same power supply, the constant electronic power type NTC thermistor is the most simple and effective measure to suppress the startup surge current and protect electronic equipment from damage. The MF72, MF73, MF74 series NTC thermistors are used in surge suppression.
The principle of ntc chip is that NTC is a thermistor, which is an acronym for \"negative temperature coefficient\". The principle is to know that the temperature of the object is measured from the amount of change in the resistance value, due to the change in temperature changes, but it is large that the resistance decreases as the temperature rises so that it becomes \"negative\". That's a feature.
Ceramic semiconductors (metal oxide sintered bodies) sintered by mixing oxides such as nickel, manganese, cobalt and iron are used as sensors. In fact, the substance to be doped determines whether an N-type semiconductor or a P-type semiconductor is formed. Normally, when the semiconductor is not subjected to any external stimulus (no light is applied, no voltage is applied, etc.), the electrons do not move and almost no current flows. In other words, the resistance is high.