Views: 1 Author: Site Editor Publish Time: 2019-09-30 Origin: Site
The NTC thermistor is a semiconductor resistor whose resistance value changes in an opposite direction as the temperature changes, and the rate of change is extremely large. Usually the thermistor can be used in temperature detection, temperature compensation, anti-surge and other occasions. This article wants to talk to you about the anti-surge protection of the thermistor.
Another very broad use of NTC thermistors is the protection against surge currents in power supplies. In the rectification and filtering circuit, in order to avoid the instantaneous surge current generated by the capacitive load charging at the instant of starting the electronic circuit, a power type NTC thermistor is usually connected in series in the power supply circuit. This can stop the inrush current during startup, and after the completion of the suppression of the inrush current, the resistance of the NTC thermistor will drop to a very small value due to the continuous action of the current, and the power consumption can be neglected. It will affect the normal operation of the circuit.
Therefore, in the small and medium power supply circuit, the method of using the power type NTC thermistor to stop the startup surge current is widely used. Different resistors play different roles and can be avoided before use. In recent years, the development of thermistors is also very impressive. Don't forget to choose a guaranteed manufacturer when purchasing.
