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Inrush current or input surge current refers to the momentarily large surge current that occurs when you first turn on power to a device. Inrush current often occurs in devices with a large amount of parallel capacitance at the input, such as DC-to-DC converters or devices with extremely low impedance under transient conditions, such as electric motors. Inrush current can be several times larger than the device’s steady-state current. For instance, electric motors can have inrush current levels 25 times greater than their steady-state current levels.
When you characterize inrush current, you either capture a high-resolution digitized proile of a device’s inrush current or just capture a reliable peak current reading. The traditional method for characterizing inrush current combines a power supply, a digitizer or scope, and a current shunt or current probe. In this measurement brief, we will look at using a modern performance power supply for characterizing inrush current and compare it with the traditional method.
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