Simple and effective inrush-current limiter stops surges

by Gregory Mirsky, Juno Lighting Group, ModuLight Division, Des Plaines, IL; Edited by Charles H Small and Fran Granville, EDN, Aug 02 2007

Focus:
Active circuit measures inrush current and then switches a series resistor into the input path of the power supply to limit inrush current during charging of input capacitors. Once current reaches a preset threshold, the circuit switches out the resistor using a relay. This represents a lower-loss alternative to NTC thermistors.

What you’ll learn:

• How to limit power supply inrush current using an active, power-saving circuit

Notes:
An EDN Design Idea

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