When the switching power supply is turned on, 220V AC power, after the fuse and the thermistor, after rectification, the capacitor is charged, and the characteristic of the capacitor is that the instantaneous charging current is large, thus causing impact on the front rectifier diode and the fuse, w

The material constant of the thermistor, that is, the thermistor chip (a kind of semiconducting ceramic), after being sintered at a high temperature, forms a material having a certain resistivity, and each formulation and sintering temperature has only one B value, so the material is a material. con

1. Thermistor detection methodThe nominal resistance of the thermistor is measured with a special instrument at a temperature of 25 C. In amateur conditions, the multimeter can also be used for electrical detection. However, when the multimeter is tested, the thermal effect is formed due to the larg

1. Thermistor definitionThe thermistor is a component with high sensitivity and is divided into a positive temperature coefficient thermistor (PTC) and a negative temperature coefficient thermistor (NTC) according to the temperature coefficient. Typical characteristics of thermistors are their sensi

According to the temperature coefficient, it is divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor (NTC). Overcurrent overload protection PTC thermistor selection mainly has the following aspects: Working voltageThe PTC thermistor is connec

Thermistors have two main functions in air conditioning, one is to achieve automatic control of air conditioning comfort, and the other is to protect. 1. Indoor environment thermistorMost of them are placed in the air intake of the air conditioner, and the value of the air temperature is collected.

When the switching power supply is turned on, 220V AC power, after the fuse and the thermistor, after rectification, the capacitor is charged, and the characteristic of the capacitor is that the instantaneous charging current is large, thus causing impact on the front rectifier diode and the fuse, w

In the absence of dedicated NTC thermistor test instruments, meters and measurement fixtures, but need to measure NTC thermistors, how to measure? Here's a simple test method: 1. Measurement tools and materials:(1) Four and a half multimeters: two(2) Test fixture: one(3) ± 0.1 ° C thermometer: one(4

The PTC thermistor for overcurrent protection is a protection element that automatically protects and automatically recovers abnormal temperature and abnormal current. It is commonly called "self-resetting fuse" and "10,000 times fuse". It replaces the traditional fuse and can be widely used for ove

The nonlinear change of the thermistor is very simple, because once the ambient temperature exceeds the standard, the resistance value of the thermistor made of special materials can become very large immediately under the circuit voltage detection. This characteristic thermistor can be used in open