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The paper proposes a buck/boost dc-dc converter topology based on a simple auxiliary snubber. The snubber is simple yet effective in reducing the switching losses. In addition to the conventional active switch loss reduction, the snubber can participate in suppression of output diode reverse recovery through synchronous rectifications and it can also be used to provide complete soft switching in the...
Dual Active Bridge (DAB) topology performs very well for converter output/input ratio close to transformer ratio. However, if a considerable deviation from the transformer ratio is required the conversion efficiency drops significantly. The approach presented in this paper uses variable AC link reactance to improve the DAB performance during operation at light load. The variable reactance is obtained...
A DC-DC converter based on the Dual Active Bridge topology is designed, having high power density as main design target. To that aim, a simple structure has been proposed for the transformer with embedded inductor, allowing high frequency operation with low losses and requiring only readily available magnetic core shapes. Simple phase-shift control has been used, and the switching frequency is varied...
The paper describes a study aiming at reaching a very high 99% efficiency in DC-DC chopper for electric vehicle (EV) application by improvements of conventional SAZZ topology. Optimisation of the operating frequency and the use multiple parallel SiC diodes were the main improvements of SAZZ chopper that were studied. These led to obtaining the efficiency of 98.96% in an 8 kW experimental setup. New,...
The paper presents an approach to designing automotive converters with main objectives being high efficiency and high power density. The approach is demonstrated by presenting two case study designs and measurements on converter prototypes. The goals of high efficiency and high power density are reached by an optimal converter design including soft switched SAZZ topology, paralleled mosfets, integrated...
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