—A high efficient LLCC-type resonant dc-dc converter is discussed in this paper for a low-power photovoltaic application. Emphasis is put on the different design mechanisms of the resonant tank. At the same time soft switching of the inverter as well as the rectifier bridge are regarded. Concerning the design rules, a new challenge is solved in designing a… (More)
This paper presents a high-efficient three-phase DC- AC grid-connected converter rated at 150 W. Two fundamental aspects led to the high efficiency, e.g. 96.2% at nominal power which corresponds to only 5.9 W losses. First, over the whole operation range, the converter operates as a resonant pole inverter (RPI), thus zero voltage switching at turn on is… (More)
A full-bridge power-electronic building block using an inverse coupled inductor (CI) is presented which could substitute standard hard switched inverter legs. In contrast to commercial CPU supplies using CIs, the system is operated at full duty cycle range 0...1 at elevated power levels and shows experimentally proven material savings. The mathematical… (More)
This paper presents an improved modulation strategy for an LLC - type resonant converter in a solar application. Neither frequency- nor phase-shift-modulation alone is used, but a new hybrid modulation technique depending on a resonant current zero-crossing. Control can be implemented using only one parameter ton while supporting soft-switching.… (More)
This paper illustrates the potential of using projects like IEEEs International Future Energy Challenge as a way to consolidate acquired knowledge and independently deepening it. To do so, the opinion of both a participating student and the supervising professor are stated using the example of the controls of a solar energy system.