Power Supply Measurement and Analysis

Power Supply Measurements with an oscilloscope, current probe, and voltage probe

Power Supply Measurement and Analysis



Today’s efficient power converters demand less input power per watt of output, but they also demand more in terms of power supply measurements. Topologies are increasingly complex, and parasitics are everywhere, demanding careful comparison of simulations and measurements. Increasing switching frequencies make it harder to control EMI. And systems require a wide range of low-noise, fast-responding power supplies. You've come to the right place.
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Switching Loss Measurement and Analysis

Switching loss makes up a significant percentage of the total loss in a switch mode power supply. Learn how to measure it under operating conditions.

  • Define switching loss during turn-on, conduction, and turn-off
  • How to set up measurements
  • Performing switch loss using manual setup and math
  • Performing switch loss using automated power analysis options
Multiplying voltage and current on a MOSFET gives instanteous power.  Average power dissipation is switching loss

Measure instantaneous power throughout the switching cycle

In-circuit Inductor and Transformer Loss Measurement

B-H curve and inductance measurements on an oscilloscope

Analysis of real-time voltage and current can provide inductance and B-H curves

Find out about making in-circuit oscilloscope measurements on magnetic components, including inductance, loss and B-H curves.

  • Brush up on practical magnetics
  • Inductance measurements under operating conditions
  • Measure loss in inductors and transformers

GaN and SiC Switching Device Measurements

High switching speeds and common mode voltage present measurement challenges. Learn how to address them.

  • Overcome high common mode voltages
  • Simultaneously measure multiple control and timing signals
  • Achieve faster automated measurements
  • Conduct pre-compliance EMC checks
Upper and Lower gate drive signals on a half-bridge power supply switching FET

Isolation is the key to seeing gate drive signals

Transistor Safe Operating Area (SOA)

MOSFET drain to source voltage and current can be measured and compared to the safe operating area specified in the component datasheet

Drain-to-source voltage and current measured against SOA mask.

Use measurements to confirm that FETs, IGBTs, or BJTs are operating within the safe operating area specified in their datasheets.

  • Making spot checks on voltage and current
  • Using limit test to look for overcurrent or overvoltage
  • Automated mask testing

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