Noise from the converter propagates out of the module and can cause significant problems for control and communication systems. DC-DC converter-generated noise circulating throughout the PDN can cause erratic system operation and negatively influence the overall behavior of adjacent systems that share an electrical connection. The following figure shows two DC-DC converters that share a point of common coupling with a DC source, as well as control and communication systems, which are typically sensitive to noise.

If left unchecked, this noise can cause a host of problems within the power system. EMI input interference problems and solutions The converters’ switching action also generates differential-mode noise, but its travel is limited to the circulation between the input terminals of the converter. This noise travels in-phase out of the converter’s positive and negative input terminals and closes through the system’s ground reference. The switching action of DC-DC converters and parasitic circuit elements distributed throughout the PDN cause two types of noise currents that must be filtered: common-mode and differential-mode.Ĭommon-mode noise originates from the high-voltage switching nodes present inside the converter coupled through parasitic capacitance to an EMI ground reference. Complete power system filtering elements required to mitigate switching converter noise.

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