Inrush current is a transient surge of electrical current that occurs immediately when a device, such as a DC power supply, is powered on. This initial spike typically exceeds the steady-state operating current significantly before stabilizing to normal levels.
Causes and Risks
In power supplies, inrush current is primarily caused by the rapid charging of internal smoothing capacitors. At the moment of power-on, these uncharged capacitors present extremely low impedance, drawing a large flow of current. Without management, this surge can stress internal components, trip external circuit breakers, or cause voltage sags that may disrupt other sensitive equipment on the same power line.
Matsusada Precision's Approach
To ensure high reliability and stable operation, Matsusada Precision's high-voltage and DC power supplies are engineered with integrated protection circuits, such as soft-start mechanisms and inrush current limiters.
These features effectively suppress the initial current surge, preventing nuisance breaker tripping and reducing stress on the power distribution network. This design philosophy ensures our power supplies are safe to operate and easy to integrate into demanding industrial and research systems.
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