This paper proposes a new dc-dc static power converter, designated Bidirectional Current-Fed Flyback-Push-Pull DC-DC Converter. Circuit operation, analysis, simulation, design example and experimental results are included in the paper. What distinguishes the proposed converter from the previous circuits is the existence of input and output inductors, which provides a significant reduction of both the power source and the load side current ripple. The proposed converter is suitable for the renewable electric power systems, such as those having fuel cells as the DC-source power supply. It is also a good candidate for electric vehicle power systems, where bidirectional power flow related with battery charge and discharge is necessary.

In this paper is presented a bidirectional dual active clamping push-pull dc-dc converter, to be used in applications which require isolated bidirectional interface between two dc ports with low-voltage/low-current ripple. The main characteristics of the proposed converter are the non necessity of input and output filters in both ports, galvanic isolation, reduced number of magnetic components and high efficiency operation. The paper presents a theoretical analysis of the proposed converter and experimental analysis for a 600W prototype, with 50kHz switching frequency, and dc power supplies of 14 and 42 volts, at the input and output ports, respectively. The measured performance agreed well with the theoretical predictions.

The use of remotely piloted aircraft systems (RPAS) is already a reality in applications such as geographic mapping, surveillance, digital marketing, delivery, agriculture, infrastructure inspection, and others. Most of these aircraft are purely electric, being the only source of energy, packs of ion-lithium or lithium polymer batteries. These battery packs are conceived by the association of a different number of cells, usually ranging from three cells (3S) to twelve cells (12S). However, universal battery chargers for this range are not consolidated yet due to the recent emergence of the use of RPAS for different applications. To overcome this drawback, this paper introduces a topology to charge a wide range of low voltage battery packs (3S-12S) for RPAS. The circuit is composed of two power converters, one of them is a DCM SEPIC PFC rectifi er and another is a dc-dc Buck converter. The system is design for 400 W of rated power and the proposed solution is suggested to charge battery packs from 3S to 12S.

This paper presents a bidirectional flybackpush-pull dc-dc converter. The main characteristics of the proposed converter are galvanic isolation by highfrequency transformers, high efficiency, reduced number of components and low current ripple at both the input and output DC power supplies. The typical applications include isolated bidirectional interface between two low voltage DC buses, where low current ripple is required. The study presents theoretical analysis, design example and experimental data for an 800 W, 80 VDC input, 160 VDC output and 50 kHz of switching frequency, on the laboratory prototype. The measured performance and theoretical predictions were in good agreement.

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