Sep 26 – 30, 2011
Vienna, Austria
Europe/Zurich timezone

Power Network impedance effects on noise emission of DC-DC converters

Sep 29, 2011, 4:00 PM
2h 30m
Vienna, Austria

Vienna, Austria

<font face="Verdana" size="2"><b>Vienna University of Technology</b> Department of Electrical Engineering Gusshausstraße 27-29 1040 Vienna, Austria
Poster Power Posters


Maria Cristina Esteban Lallana (Instituto Tecnologico de Aragon)


The characterization of electromagnetic noise of DC-DC converters is a critical issue that has been analyzed during the design phase of CMS tracker upgrade. Previous simulation studies showed important variations of conducted emission of DC-DC converters among impedances and power network topologies. Several tests have been performed on real DC-DC converters to validate the Pspice model and simulation results. This paper presents these test results. Conducted and radiated noise emissions at the input and at the output form DC-DC converters have been measured for different types of power network and FEE impedances. Special attention has been paid to the influence of carbon fiber in the CM noise emissions. The results of these studies show important recommendations and criteria to be applied to integrate the DC-DC converters to decrease the system noise level.

Summary 500 words

The upgrade of the tracker system plans to develop a new power distribution scheme based on switching power converter technology. A big effort in the DC-DC converter design has been conducted to minimize the noise emissions. However, this effort has to be complemented with EMC studies at system level to predict noises problems during the integration stage. During last year, a set of Pspice simulations have shown the important influence of power network impedance and topology on noise emission of DC-DC converters. Nevertheless, these simulations need to be completed by a set of real measurements to confirm the effects of the network impedance magnitude and integration options in the current noise emission of the DC-DC switching converters.

This paper presents a set of real measurements of conducted and radiated noise emitted by a DC-DC converter with respect to different impedances and number of converters connected to a common power bus. The conducted noise emission at the input and at the output in different areas at system level has been measured. Also, radiation emissions (electric and magnetic field) from DC-DC converters in a semi-anechoic chamber are presented too. This is the first time that this kind of measurements is presented high energy physics. These measurements will be compared with common mode conducted emissions to establish a relationship between both radiated and CM conducted noise.

This paper is the last stage of the noise studies of DC-DC converters at system level. These simulation and measurements will help to define a set of integration rules and strategies that will define the specifications, location, granularity and filtering performance degradation for the DC-DC converters. The main goal of this study is to anticipate and minimize the total amount of noise present in the Tracker environment and reduce the risks during the integration of the system.

Primary authors

Dr Fernando Arteche Gonzalez (Instituto Tecnologico de Aragon) Maria Cristina Esteban Lallana (Instituto Tecnologico de Aragon)


Ivan Echeverria Ciaurri (Instituto Tecnologico de Aragon) Mrs Ivan Vila (Instituto de Fisica de Cantabria) Mateo Iglesias Amella (Instituto Tecnologico de Aragon)

Presentation materials