Inrush current prevention

When powering on electrical equipment, if there is a capacitor in the internal circuit, an inrush current that greatly exceeds the rated value, mainly due to the charging current, may flow. In such cases, the contact points of components on the input side circuit may be damaged by the inrush current, or a surge may be generated in the power supply circuit, potentially causing adverse effects. Therefore, this refers to a function that limits the input current to prevent inrush current. To prevent inrush current, one method is to insert a power thermistor in series, which changes its resistance depending on the capacitor temperature.