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Keysight Technologies
Methods for Characterizing and Tuning
DC Inrush Current


                              Application Brief
Introduction

     Inrush current or input surge current refers to the momentarily large surge current that occurs when
     you irst 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 imped-
     ance 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.


     Snapshot
     An automotive company is updating its test system for electronic control unit (ECU) testing. Its
     engineering team scrutinizes the test plan to ind ways to increase throughput and reduce test system
     complexity without reducing test integrity. The team identiies the inrush current measurement as a
     candidate for improvement. The system currently employs a power supply, a current shunt and
     digitizer, and switching to automate the inrush current measurement. The team decides to replace this
     setup with the Keysight Technologies, Inc. N7951A dynamic DC power supply. The N7951A is a fast
     power supply with a built-in high-resolution digitizer. N7951A provides them with a single-instrument
     solution that speeds up test, reduces test system complexity, and delivers higher accuracy than their
     old method for measuring inrush current.
03 | Keysight | Methods for Characterizing and Tuning DC Inrush Current - Application Brief



       Methods for Characterizing Inrush Current                                                  switch open to allow the supply to ramp-up to the set
                                                                                                  voltage level. Once that is accomplished, closing the
       Main reasons why characterizing inrush current is necessary                                switch would apply the voltage to the DUT. Even with
       in many test applications:                                                                 the switch, problems can still surface. If the supply's
                                                                                                  transient response is poor, its voltage level will droop
          1. Device protection 

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