What is surge current - Solutions - Huaqiang Electronic Network

Filter 18.432M

Surge current, also known as inrush current, is the high level of current that flows into a power supply system when it is first turned on. This occurs because the input filter capacitors need to be charged quickly, which results in a current spike that can be significantly higher than the normal operating current. To ensure the safety and reliability of the power supply, it's essential to design the system with proper surge protection. Components such as AC switches, rectifier bridges, fuses, and EMI filters must be rated to handle these transient currents. Repeated switching or sudden voltage changes can lead to component failure if not properly managed. Therefore, the power supply should include mechanisms to limit this surge, preventing damage to internal components and avoiding unnecessary fuse blowouts. Understanding and controlling surge current is crucial for maintaining the longevity and performance of power systems.