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Burst mode control is applied to improve light load efficiency of LLC converter in this paper. Detailed analysis on characteristic and operation processes of LLC burst mode control with SR is presented. Based on the analysis, some important rules of LLC burst mode control are proposed, which is the key to achieve high light load efficiency. The rules include: the suitable primary and secondary driving...
In this paper, a novel bridgeless power factor correction (PFC) circuit has been proposed. High efficiency can be obtained especially at low line condition because no input bridge rectifier is used in the proposed topology. A concept of unique configuration of diodes has been proposed to reduce the common-mode (CM) conducted noise. Eventually, an 800 W prototype has been built. And experimental results...
To meet the demand for high power density, it is necessary to push the switching frequency of PFC converter as high as possible while keeping high efficiency and low EMI. In this paper, the switching frequency effects on PFC choke, heat sink and EMI filter are discussed in detail and the optimized and utility operating frequency of PFC converter is obtained
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