EMI Noise Evaluation in an Interleaved GaN-based PFC Converter

While interleaving helps to reduce the size of Electromagnetic Interference (EMI) filter due to current ripple reduction, it also adds to the complexity of the converter to create an accurate phase shift between paralleled modules. Therefore, from the industrial point of view, the trade-off between the EMI noise reduction and added circuit complexity needs to be justified. Moreover, Power Factor Correction (PFC) converters with Gallium Nitride (GaN) semiconductors and highly integrated packages have unique EMI characteristics. This paper explores EMI noise in a GaN-based PFC using various current sharing methods. The experimental evaluation shows that interleaving significantly decreases EMI noise, allowing for a notable reduction in EMI filter inductance.