Application of NTC in Inverter.Infrared sensing module direct sales

　　In DC power supply circuits such as DC-DC converters, etc., NTC thermistors are used as power supply thermistors to effectively limit the magnetizing inrush current, and the input and output capacitors are charged when the power is turned on. The resistance of an NTC thermistor becomes very low after power-up, achieving lower power losses than when using a fixed resistor.

　　Induction motors are often used in fans, pumps, air conditioners and other equipment in factories, large facilities, office buildings, etc. Induction motors are simple and stable in structure, but their speed depends on frequency. In order to control the rotational speed, an inverter is required. Motors equipped with inverters are known as variable speed drives (VSDs) and can significantly reduce power consumption.

　　The inverter system includes a converter section, an inverter section, and a DC link capacitor (smoothing capacitor) installed after the converter section. At start-up, the device is charged and the DC link capacitor is filled with a magnetizing inrush current with a peak value several times greater than the steady current. This magnetizing inrush current can have a detrimental effect on the life of the DC capacitor or destroy the semiconductor device. To prevent magnetizing inrush current, connect an NTC thermistor (power thermistor)

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