The four-switch buck-boost (FSBB) topology is often used in combination with other isolated converters to extend the voltage range capability of the overall structure. In such applications, the duty-cycles of the two legs of the FSBB are independently controlled, and a phase-shift is introduced in order to shape the inductor current ripple and thus achieve zero voltage switching. This paper proposes a non-linear average model, and the corresponding linearized small-signal model, for the FSBB operated in the described way. The derived average and small-signal models are shown to be in excellent agreement with simulation and are also validated by measurements on an experimental prototype.

Average and Small-Signal Model of the Four-Switch Buck-Boost Converter under both Duty-Cycle and Phase-Shift Modulation

Gallo E.;Cvejić F.;Spiazzi G.;Biadene D.;Caldognetto T.
2023

Abstract

The four-switch buck-boost (FSBB) topology is often used in combination with other isolated converters to extend the voltage range capability of the overall structure. In such applications, the duty-cycles of the two legs of the FSBB are independently controlled, and a phase-shift is introduced in order to shape the inductor current ripple and thus achieve zero voltage switching. This paper proposes a non-linear average model, and the corresponding linearized small-signal model, for the FSBB operated in the described way. The derived average and small-signal models are shown to be in excellent agreement with simulation and are also validated by measurements on an experimental prototype.
2023
CONFERENCE PROCEEDINGS - IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION 2023
978-1-6654-7539-6
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3502986
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