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Controlling Conducted Noise in Military-Grade DC-DC Switching Power Supplies using Multiphase Synchronisation Techniques
Switching DC-DC converters in military applications must meet stringent standards for limits on
conducted input noise emissions and typically require input filter networks for compliance.
However, when inputs of DC-DC converters are paralleled, noise can combine in indeterminate ways, making filter design difficult. This article discusses the issue and describes a way to achieve a consistent and substantial reduction in emissions using the phased switching frequency synchronization technique.