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Performance of AEC-Q200 rated power resistors for automotive use

By EDN Posted On 13.2.2019

Source: EDN article

by Bertram Schott & Adrian Michael.

Wirewound power resistors are usually rated with respect to continuous power, which can be insufficient for e-mobility applications. A typical application is the pre- and discharge of large capacitors, often referred to as “soft start.” In this case the pulse-handling capability of the resistor is also very important. This capability can be determined over a large range of pulse durations by combining theoretical basics with finite element simulations of the respective thermal performance. The results can be generalized so that changing customer specifications can quickly be evaluated and suitable resistors suggested. (more…)

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Why low ESR matters in capacitor design

By Capacitor Faks and EPCI Posted On 11.2.2019

Source: Capacitor Faks blog, EPCI

by Anthony Kenny (Capacitor Faks) and Tomas Zednicek (EPCI). A practical capacitor is a non-ideal component. Its circuit model contains series inductance (ESL) and series resistance (ESR). Although equivalent series resistance is often shown in circuit models as a constant value, it varies depending on operating conditions. ESR is resistance from a combination of energy loss mechanisms under specific operating conditions. (more…)

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All Applications / All Resistors / Applications / e-PassiveBlog / Industrial / Power Conversion / Resistors

Cressall Releases Infographic Explaining the Essential Questions to Ask when Designing an Enclosure for Power Resistors

By Cressall Posted On 11.2.2019

Source: Cressall news

Power resistor enclosures: seeking the answers
Cressall, has released an informative infographic explaining the essential questions to ask when designing an enclosure.
The guide aims to support design engineers as well as resistor end users across all industries to understand the requirements of their power resistor enclosure. (more…)

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Effects of ESL on capacitor performance

By Capacitor Faks and EPCI Posted On 8.2.2019

Source: Capacitor Faks blog

Capacitors are widely used in electronic circuits for storing and managing energy. Typical applications include filtering, decoupling, energy storage, and tuning. Some applications such as decoupling demand low impedance, high ripple current capability, and excellent surge performance. Inductance is one of the key parameters to consider when selecting a capacitor for high speed digital circuits. (more…)

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All Applications / Applications / e-PassiveBlog / Inductors / Power Conversion

How to design a high voltage DCM inverting charge pump converter

By EDN Posted On 7.2.2019

Source: EDN article

Power Tips #87: How to design a high voltage DCM inverting charge pump converter. By John Betten

A low-current, negative high-voltage is required to bias sensors in advanced driver assistance systems, ultrasonic transducers for sonar applications and communications equipment. Flyback, Cuk and inverting buck-boost converters are all possible solutions, but are penalized by bulky transformers (flyback and Cuk) or limited in their maximum negative voltage by the controller’s input-voltage rating (inverting buck-boost). In this power tip, I’ll detail the operation of a converter that pairs a single inductor with an inverting charge pump operating in discontinuous conduction mode (DCM). Paired with a ground referenced boost controller, a large negative output voltage can be generated at a lower system cost. (more…)

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All Applications / Circuit Design / DC/DC Converters / e-PassiveBlog / Inductors / Resistors

RC Snubber Design for SMPS Protection

By InCompianceMag Posted On 1.2.2019

Source: InComplianceMag article

by Bogdan Adamczyk and Bill Spence.

Fundamentals of Inductive Switching and RC Snubber Impact
This is the first of the two articles devoted to the topic of an RC snubber design. In Part I we discuss the fundamentals of the inductive switching and the need for circuit protection. The impact of an RC snubber on the circuit performance is demonstrated through a series of simulations. Part II (to appear in the March 2019 issue of In Compliance) will address the systematic process of the snubber circuit design, together with the simulation and verification through the laboratory measurements. (more…)

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Alter Explains Vibration Tests on HI-ReL EEE Parts

By Alter Technology Posted On 24.1.2019

Source: Alter Technology article

by María Teresa Rodríguez. In order to ensure the proper system operation under such conditions, High-Rel EEE parts have to be submitted to thorough vibration test before their implementation in different areas. These tests must be carried out according to different specifications depending on the application areas. (more…)

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All Applications / Applications / Automotive / Capacitors / e-PassiveBlog / editors choice / EMI/EMC

Using Class X and Y capacitors for EMI suppression in electric vehicles

By Capacitor Faks Posted On 23.1.2019

source: Capacitor Faks blog

by Anthony Kenny.

Unwanted signals can significantly compromise the performance of an electronic circuit and its components. These signals come from a variety of sources, and they are generally referred to as electromagnetic interference (EMI). Although these unwanted signals are unlikely to damage an electronic system, they can considerably distort signals. In an electric vehicle, the electric drive system generates EMI noises in the form of radiation and common mode currents. Suppressing these EMI noises helps to improve the overall performance of the electric drive system. (more…)

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An introduction to insertion loss and filter capacitor performance

By Capacitor Faks Posted On 2.1.2019

Source: Capacitor Faks blog

by Anthony Kenny. Capacitors are used in both analog and digital circuits to remove unwanted signals. The filtering performance of a capacitor or filtering circuit is commonly described in terms of insertion loss. Some of the factors that significantly affect the insertion loss performance of a filtering circuit include configuration of the filtering elements, impedance, and load current. (more…)

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All Applications / Capacitors / e-PassiveBlog / Inductors / Modelling & Simulation / Resistors

R, L, C, and a PCB Trace Impedance Measurement and Simulation

By InCompliance Mag Posted On 28.12.2018

Source: InCompliance Mag article

by Bogdan Adamczyk and Jim Teune in EMC Concepts Explained.

This article investigates the impedance of the three standard passive circuit components (R, L, and C) as well as the frequency response of a PCB trace. It is shown that a PCB trace can be modeled as a resonant RLC network just like the standard components and effectively constitutes the fourth circuit component whose frequency behavior directly effects the impedance of the resistors, inductors, and capacitors on a PCB. (more…)

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