Inrush current prevention

When power equipment is started, 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 contacts of circuit components on the input side may be damaged by the inrush current, or surges may be generated in the power supply circuit, causing adverse effects. Therefore, this refers to a function that limits the input current in order to prevent inrush current. To prevent inrush current, methods include inserting a power thermistor in series, whose resistance changes according to the capacitor temperature.