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W_Fr_A_Room4: Measurements of conducted emissions in time domain and power-line filter design
Electromagnetic compatibility (EMC) measurements usually consume a significant amount of time in any development project of electrical or electronic equipment, especially when problems arise and the project enters in a redesign and retest loop not expected beforehand. Therefore, the EMC community devotes significant efforts to reduce the measurement time of regulated tests and to provide techniques that help on the solution design. This workshop has been focused on three techniques that can speed up the conducted-emission measurements and, eventually, can provide a solution. These techniques are:
When doing time-domain measurements, all frequencies are measured simultaneously. This is a very different situation with respect to traditional spectrum analyzers or electromagnetic interference (EMI) receivers, where the spectra are sequentially measured at several frequency steps. Thus, the reduction of measurement time in the first case with respect to the second one is significant. In this workshop, some technical issues that must be considered when performing time-domain measurements according to CISPR 16-1-1 will be covered, as for instance, the necessary dynamic range, the signal filtering, and the signal processing.
Every electric or electronic device needs a power-line filter to be compliant with any EMC regulation around the world. Knowing the modal nature of the conducted emissions (that is, knowing if the predominant mode is the CM, the DM, or a combination of both) becomes fundamental to improve the design of the power-line filter. In this workshop, different techniques to separate the CM and the DM will be analyzed, either by using analogic circuits or by signal processing in the digital domain.
For the optimal design of a power-line filter, the whole circuit information that intervenes in the system device-under-test (DUT), power-line filter and power-line network must be known. That means that the measurement of the input impedance of the DUT and the power-line network is needed. In this workshop, a measurement setup to measure the input impedance of DUTs connected to the power-line network, and the input impedance of the power-line network will be presented and used to develop a power-line filter design technique.
Actual measurements will be carried on supporting the explanation.
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