Nowadays in applications of renewable energy sources it is important to develop powerful and energy-saving photovoltaic converters and to keep the prescriptions of the standards. In grid connected PV converters the obvious solution to increase the efficiency is to reduce the switching losses. Our new developed control method reduces the switching losses and keeps the limitations of the harmonic...

Photovoltaic systems integrated to the grid have received considerable attention around the world. They can be connected to the electrical grid via galvanic isolation (transformer) or without it (transformerless). Despite making galvanic isolation, low frequency transformer increases size, cost and losses. On the other hand, transformerless PV systems increase the leakage current (common-mode c...

An active-clamping quad-flyback converter is proposed to achieve zero voltage switching (ZVS) for all power switches. The secondary sides of quad-flyback converter are connected in parallel to share the load current. Thus, the transformer copper losses and the conduction losses on the output diodes are reduced. Activeclamping part including one auxiliary switch and one clamp capacitor can relea...

In this paper, we study and analyze the mini-batch version of StochAstic Recursive grAdient algoritHm (SARAH), a method employing the stochastic recursive gradient, for solving empirical loss minimization for the case of nonconvex losses. We provide a sublinear convergence rate (to stationary points) for general nonconvex functions and a linear convergence rate for gradient dominated functions,...

In this paper different variations of the so-called “Tune-and-Select” (TAS) switching node for Optical Burst Switching (OBS) are investigated. Both signal degradation and burst losses limit the effective throughput of such optical burst switching nodes. These limitations are analysed for different nodes with four input/output fibres at different bit rates. The impact of amplifier noise figure, ...

The Manne Siegbahn Laboratory is planning for the transfer of the CRYRING synchrotron and storage ring to the future FAIR facility, where it will be used for deceleration of antiprotons and heavy ions at FLAIR. The efficiency of the deceleration process, i.e. the minimization of particle losses, is important, and we show here a strong correlation between losses during the start of the decelerat...

In this paper we address the problem of minimization of power consumption in combinational circuits by minimizing the number of switching transitions at the output nodes of each gate. A powerful combinational logic optimization method using k-map is presented here that is based on disjoint implicants (implicates) of a function. More than 10% reduction in switching activity has been obtained wit...