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Design of a Novel Integrated L-C-T Used in PSFB ZVS Converter
Jiashen Tian, Junxia Gao, and Yiming Zhang
Abstract To enhance the zero-voltage switching (ZVS) range and power density of the phase-shift full-bridge (PSFB) ZVS converter used in geophysical exploration, an additional resonant inductor used as leakage inductance and a blocking capacitor which is equivalent to interlayer capacitance are integrated into a novel integrated inductor-capacitor-transformer (L-C-T). The leakage inductance and equivalent interlayer capacitance of the novel integrated L-C-T are difficult to determine by conventional methods. To address this issue, this paper presents the accurate and efficient methods to compute the leakage inductance and equivalent interlayer capacitance. Moreover, the accuracy of the methodology which is based on the electromagnetic energy and Lebedeví»s method is verified by experimental analysis and finite element analysis (FEA). Taking the problem of the novel integrated L-C-T into consideration, the losses of the integrated L-C-T are analyzed and the temperature rise of the integrated L-C-T are determined by FEA. Finally, a PSFB ZVS converter prototype with the novel integrated L-C-T is designed and tested.
Keyword ZVS, integrated L-C-T, leakage inductance, equivalent interlayer capacitance, electromagnetic energy, Lebedev
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