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With the fast growing information technologies, high efficiency and high power density become the two major challenges for AC-DC front-end power supplies in all kinds of distributed power system applications. For the power factor correction (PFC) stage, the adaptive on-time control was proposed to achieve high efficiency over the whole load range. The EMI performance of single phase adaptive on time...
The critical conduction mode (CRM) power factor correction converters are widely used in low power front-end converters for its high efficiency. Compared to the traditional CCM PFC, the large inductor current ripple in the CRM PFC makes the DM EMI noise a major concern and a large EMI filter is needed. Moreover, uncertainty of the worse case for the EMI noise in the CRM PFC may often lead to an overdesign...
AC-DC converters for low power applications have their unique EMI characteristics compared to the converter for other applications. It has very high DM noise due to the DCM or CRM operation and results in a relatively high transformed CM noise caused by the unbalance of the noise propagation paths. This paper summarized the important unbalanced paths and proposed methods to limit the CM noise caused...
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