Meeting EMI Requirements for Rolling Stock, Railway Applications
- Author: John Quinlan
The EMI filter design includes pure theoretical calculations, and can be used for all types of DC/DC converters (not just for railway applications). However in real life situations other factors can have a large influence on the outcome inc: PCB layout design, parasitic effects of components and test
measurement set up.
The overall EMI calculations for the filter above are used on the available evaluation board design for the Murata IRHW80, IRQW80 DC/DC converters (10).
EMI is not an exact science and not one rule can be applied for all situations, EMI filter design is an iterative process that requires fine tuning of the selected components and their inherent parasitic values to finalise the design of a suitable filter.
It is also worth noting that the testing of the filter design is carried out using fixed resistive loads, where in a typical real-life application the loads can be transient and variable in nature, also affecting the performance of the filter.
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