Inrush current prevention

When power equipment is turned on, 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 occur 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, one method is to insert a power thermistor, whose resistance changes with the capacitor temperature, in series.