SamplexPower PST-600-12

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18 | SAMLEX AMERICA INC.

SECTION 4 | Powering Direct / Embedded Switch

Mode Power Supplies (SMPS)

Input voltage

Inrush current

Peak inrush

current

Rated steady state

input RMS current

NOTE: Voltage

and current scales

are dierent

Fig 4.1: Inrush current in an SMPS

TIME

Peak Current

RMS Current

Non-linear

Input Current

Pulse

Input Sine

Wave Voltage

Crest Factor = Peak Current = 3

RMS Current

Voltage (+)Voltage (–)

Current (+)Current (–)

NOTE: Voltage

and current scales

are dierent

Fig. 4.2: High Crest Factor of current drawn by SMPS

SamplexPower PST-600-12 - Page 18