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A Novel Experimental Measurement Method of Transformer Parasitic Capacitances
Naizeng Wang,Xu Yang,Angyang Zhou,Yiting Xie 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
As the increase of switching frequency and the extensive use of planar transformers, the capacitive effects of transformers can’t be neglected anymore. Firstly, several transformer parasitic capacitance models are introduced in this paper. Next, this paper proposes a novel experimental method, charge balance method, to measure transformer parasitic capacitances. This method is applicable to single lumped parasitic capacitance model. Finally, the step response method is performed to verify the charge balance method. Experimental results show that the charge balance method is of high accuracy.
Analysis and Design of LLC Resonant Converters Operating in Reverse Mode
Angyang Zhou,Xu Yang,Mofan Tian,Naizeng Wang,Laili Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, the reverse operating characteristics of LLC resonant converters from fr/2 to fr are explored. The reverse voltage-gain and the conditions for zero-voltage switching (ZVS) of the reverse LLC resonant converter are summarized, and the frequency interval is obtained according to the magnitude of the turn-off current. The accuracy of the above analysis is verified by experiments. The research on the reverse operating characteristics of LLC resonant converters has practical significance in some special applications especially when require for the bidirectional operation.