Your Power System Failed its Conducted EMI Test – Now What? 

You just got your test results back from the conducted emissions test lab, and your product failed. Now what?

EMI tests with a complete system are always a challenge. This test is often conducted at the end of a design cycle and not passing it can create major delays. It may even require a significant redesign of the system before it can pass. But there are techniques that can be used to help mitigate the impact of test failure on project timescales and costs.

EMI noise measured during tests is the sum of all noise generated within a system. Switching noise from a power supply is one source for conducted emissions, but there are many other pulsing circuits that need to be considered when identifying the noise sources and reducing their noise spectrum.

This webinar focuses on:

• Troubleshooting techniques to help identify the real reason for EMI test failure
• Current wave shapes vs. frequency
• Common mode vs. differential mode currents
• Components to control these currents in a conducted emissions filter
• How filters can interfere with power supply stability and cause test failure.