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Modeling conduction loss SEPIC example MOSFET R on, diode V D Averaged terminal voltages of switch network, including conduction losses:
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Averaging the terminal currents
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Elimination of intermediate variables From previous slides: Eliminate inductor currents and capacitor voltages, which are external to switch network: Construct equivalent circuit:
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Spice library model CCM2
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Insert model into SEPIC Simulation of conversion ratio and efficiency
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Simulation model Buck-boost with conduction loss Buck-boost converterAveraged switch model
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Transient analysis example
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