Inrush current prevention

When power equipment is started up, if there is a capacitor in the circuit inside the equipment, an inrush current that greatly exceeds the rated value, primarily consisting of charging current, may flow. In such cases, the contact points of circuit components on the input side may be damaged by the inrush current, or the power supply circuit may be adversely affected by causing a surge. Therefore, a function that limits input current is used to prevent inrush current. To prevent inrush current, methods such as inserting a power thermistor in series, which changes its resistance depending on the temperature of the capacitor, can be used.