Conducted Emi Model for Flyback PFC Converter
Ashritha M1, M L Sudheer2

1ASHRITHA M, Centre for Excellence in EMC and Power Quality Department of E & C, UVCE, Bangalore University, Bengaluru, India.
2M L SUDHEER, Centre for Excellence in EMC and Power Quality Department of E & C, UVCE, Bangalore University, Bengaluru, India. 

Manuscript received on 12 August 2019. | Revised Manuscript received on 19 August 2019. | Manuscript published on 30 September 2019. | PP: 6916-6923 | Volume-8 Issue-3 September 2019 | Retrieval Number: C5867098319/2019©BEIESP | DOI: 10.35940/ijrte.C5867.098319
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Abstract: Power Factor Correction (PFC) units are used at the front end of Switched Mode Power Supply (SMPS) to improve the input power factor. However, they generate Electromagnetic Interference (EMI) which needs to be mitigated to compliant levels prescribed by International Standards. The Electromagnetic Compatibility (EMC) standards have set regulations which require expensive instruments and environment for their measurement. Hence there is a need for predicting Conducted EMI by simulation before the product is tested for full compliance to reduce the complexity of the circuit design and cost. To estimate the Conducted EMI, it is important to identify the main noise sources and their conduction paths. This can be achieved by simulating the circuit using the exact models of the transformer, capacitor, PCB trace, and the switching semiconductors. In this paper these components of PFC flyback converter are modelled using SPICE models, datasheet defined component parameters and experimental measurements. The theoretical analysis and simulation results show that the method discussed can predict and analyse the Conducted EMI. This is tested experimentally on a Flyback PFC converter working in Critical Conduction Mode. A line filter is designed and used to bring the noise to compliant levels. Simulation and Experimental results after using the line filter are also presented.
Keywords: EMI, LISN, Power Factor Correction (PFC) converters, Differential Mode (DM) Conducted EMI, Common Mode (CM) Conducted EMI, Flyback Converter.

Scope of the Article:
Low-power design