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Oscilloscopes are the workhorses for power electronics engineers. With powerful and easyto- use FFT analysis capabilities, their application fields extend to EMI debugging – and that saves a lot of time and money. A typical task is verifying the effectiveness of an EMI filter – early in the development phase.

English - Sep 23, 2019

In an ideal scenario, a probe accurately transmits a signal from the device under test (DUT) in its original form with no alterations. Differential probes are designed to eliminate common-mode (CM) distortion by cancelling out identical signal artifacts on each socket relative to earth. In practice, issues such as poor CM rejection, frequency response degradation and signal distortion can compromise signal integrity, particularly in high-speed power applications where signal fidelity is crucial.

English - Nov 25, 2024

Antennas have become an integral part of consumer electronics, even in small portable devices that rely on an energy source with limited capacity. Consequently, antennas need to be physically small and power efficient.

English - Mar 5, 2020

EMI compliance is becoming a major concern for advanced power electronics due to increasing switching speeds. Correlated time-frequency measurements help optimize gate driving and minimize electromagnetic emissions early on during development.

English - Apr 27, 2023

High-precision two-quadrant power supplies generate current profiles and simulate batteries

English - Dec 10, 2020

Double-Pulse testing is a standard test-method used in power electronics design. Accurate measurements require a careful design of the test setup and the selection of the right measurement instruments. This application note discusses important aspects of double-pulse test setups as well as how to perform accurate measurements.

English - Mar 22, 2021

The power efficiency of the drive electronics is a key parameter when developing electric drive systems. The conduction loss of the electric drive electronics is of special interest. One important parameter for determining the conduction loss is the RDS(on) of the MOSFET. When a switching MOSFET is off, it has a high drain-to-source voltage, but when it is turned on, the voltage drops to just a few hundred millivolts. A highresolution oscilloscope is needed to measure these low voltages. Probe compensation and correct probing are also vital for accurate RDS(on) measurements.

English - Mar 19, 2015

This document is divided in two parts and starts with an introduction in AC-DC conversion principles in general. It will present the most common circuits used for different power levels. The switching mode power supply (SMPS) converter will be the main focus as they are used everywhere in the electronics. Especially the flyback converter design in different flavors are highlighted. Nevertheless, all measurements are also applicable for other SMPS converter designs operating at higher power levels.In the second part of this document, most relevant testing methods and procedures of an AC-DC converter are highlighted. For each testing section, a fundamental part will be upfront discussed and it is followed by a presentation of a suitable measurement method. In this second part, the device under test (DUT) is considered as black box device and thus the structure is similar. Therefore, the testing parts consists of methods related to input tests, output tests and a combination of both like efficiency. Of course, some test performed at the output of the converter are also relevant for DC-DC converter, e.g. the validation of the output ripple.

English - Nov 14, 2022

Transformers are passive devices that are primarily used to convert or "transform" alternating current (AC) from one voltage level to another. One very common application of transformers is in AC to DC power supplies, in which mains voltage is stepped down before being rectified and filtered to produce DC. There are numerous other applications for transformers, such as providing electrical isolation or for impedance matching.This educational note provides a brief technical introduction to measurements made on the types of transformers used in electronics. These transformers are typically physically small, work on relatively low voltages or powers, and are used for “indoor” applications. Although many of the testing concepts described below also apply to the larger, higher-power "outdoor" transformers used for electrical power distribution, the specific tests and test procedures for these types of transformers are often specified by standards bodies such as the IEEE and may differ substantially from the types of measurements described here.Read this educational note and dive into the discussion about the six most important transformer measurements: turns ratio, mutual inductance, phase angle, primary and secondary inductance, leakage inductance, and interwinding capacitance.

English - Feb 28, 2024

Getting EMI emissions under control is one of those tasks that R&D engineers do not enjoy doing . EMI must often be taken into consideration as early as the design phase, particularly in the case of power electronics systems with increasing switching speeds of wideband gap semiconductors. While EMI receivers or spectrum analyzers are always the preferred choice for these measurements, they are often not available as standard measurement equipment in the R&D lab. To allow optimization early on in the R&D lab, Rohde & Schwarz provides a free tool to simplify conducted emissions debugging using oscilloscopes.

English - Sep 27, 2021