La thermistance NTC est également appelée thermistance à coefficient de température négatif, sa caractéristique est que sa valeur de résistance change inversement avec la température, par exemple, la valeur de résistance diminue lorsque la température augmente. Selon ses caractéristiques, il peut être utilisé à deux fins : la suppression du courant d'appel et la mesure et le contrôle de la température au moment de la mise sous tension-dans le circuit d'alimentation.
At the moment when the electric bicycle charger is turned on, a surge current that is dozens or even 100 times higher than the working current will be generated, which will lead to damage and early failure of other components of the electric bicycle charger. At this time, a high-reliability power NTC thermistor is needed to absorb the instantaneous surge current. However, since the power NTC thermistor bears a large energy shock, its own reliability and safety are very important. It is important that some power NTC thermistor manufacturers cut corners and cut corners to reduce costs and reduce product quality blindly. Power NTC thermistors frequently burst, smoke or even catch fire during use. The safety and life of the protection components of electric bicycle charger safety and life have become a big problem, and become an important safety hazard in the use of electric bicycle chargers; If it is found that the charging is abnormal and the temperature is too high, accidents such as fire and explosion caused by thermal runaway of charging will occur. At this time, one or two temperature-measuring NTC thermistors with reliable performance and responsiveness will come in handy. The resistance value of the type NTC thermistor corresponds to the temperature one by one. The temperature measurement type NTC thermistor with a resistance value accuracy of ±1 percent can measure the temperature change of ±0.5 degree . The temperature measurement type is used in the electric bicycle charger circuit. The real-time monitoring of the temperature change in the charging process by the NTC thermistor can greatly improve the safety of the electric bicycle charger. Of course, if the quality of the temperature-measuring NTC thermistor is not good, the expected purpose cannot be achieved. Therefore, choosing a high-reliability power NTC thermistor and a high-reliability, high-sensitivity temperature-measuring NTC thermistor is the key to the reliability and safety of electric bicycle chargers, otherwise it will become a safety hazard due to failure. source, resulting in immeasurable losses.
