Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 10, Pages 9420-9432Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3022496
Keywords
DC-DC power converters; t-type; wide conversion range; zero voltage switching (ZVS)
Categories
Funding
- CAPES-Coordination of Superior Level Staff Improvement within the Ministry of Education of Brazil
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This article introduces an isolated soft-switching dc-dc converter based on the t-type commutation cell and employing capacitive output filter. It proposes a hybrid switching strategy and details the energy transfer process and static model. Laboratory tests validate the feasibility of the proposed circuit and theoretical analysis.
An isolated soft-switching dc-dc converter based on the t-type commutation cell and employing capacitive output filter is introduced in this article. A hybrid switching strategy is proposed, allowing the circuit to operate with a three- or four-level scheme relying on a unique duty cycle definition. The energy transfer process regarding two distinct continuous conduction modes is detailed and a complete static model is derived. Also, the requirements for the occurrence of zero voltage switching (ZVS) on the switches are evaluated, and a small-signal analysis is carried out to provide information on the dynamic behavior of the proposed circuit. The operation of the proposed converter is verified for the conditions of fixed input and output voltage and of wide input voltage range designs. Laboratory tests with a 1.2 kW prototype operating in closed-loop demonstrate the feasibility of the proposed circuit and validate the theoretical analysis carried out.
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