19.4.4 Design ExampleAnnotated ECEN5817 Lecture 10 slides [taped in 2010]gpSelect resonant tank elements to design an LCC resonant inverter that meets the following requirements:• Switching frequency fs= 100 kHz•Input voltage Vg= 160 Vpgg• Inverter is capable of producing a peak open circuit output voltage of 400 V•Inverter can produce a nominal output of 150 Vrms at 25 WInverter can produce a nominal output of 150 Vrms at 25 WECEN 58171Design summaryFound from the required output characteristic (ellipse), based on Voc, V, P3 nF-j498 1.96 mHj1230 k1 nFR = 900 Nominal load-j1493 761)1493732()( jjXXjZpsi732)4981230(0jjjXZsi1ECEN 58172146611||||0HZRocritLCC inverter Ziimpedances and corner frequenciesECEN 58173Extending ZVS range?ECEN 58174Dynamic Modeling of Resonant ConvertersSo far: •Steady-state analysis of resonant converters using sinusoidal approximationSteadystate analysis of resonant converters using sinusoidal approximation• Resonant-tank design• Meet the operating point requirements• Favorable ZVS and load-dependent conduction lossesNext:Fdbk tl d t t ?•Feedback control around resonant converters? • Frequency (FM) control, or •Amplitude (AM) control via pulse-width modulationp() p• Need small-signal dynamic modelsECEN 58175Extensive notes by Prof. Erickson are available on the course websiteECEN 58176Introduction to resonant inverter controlECEN 58177ECEN 58178Introduction to small-signal modeling of resonant converters ECEN
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