One of the difficulties with PWM switching converters is high switching loss and electromagnetic interference due to switching at non-zero voltage and current, which limits the operating frequency. In order to reduce the converter volume and weight (by increasing the frequency) and reducing switching losses, zero voltage and current switching methods are recommended. In this paper, four main ze...

Stochastic on-off conductivity switching observed in phenylene-ethynylene oligomers has been explained in terms of changes in ring conformations, or electron localization, or both. We report the observation of stochastic on-off switching in the simplest of wired molecules: octanedithiol, decanedithiol, and dodecanedithiol bonded on an Au(111) surface. Stochastic switching was observed even when...

One of effort to overcome the planar MOSFET’s limit is super-junction technology in high voltage power MOSFET. This technology can dramatically reduce both on-resistance and gate charge, which is usually a trade-off. With smaller parasitic capacitances, the super-junction MOSFETs have extremely fast switching characteristics and therefore reduced switching losses. Naturally fast switching behav...

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Discretely controlled continuous systems (DCCS) represent an important class of hybrid systems, in which a continuous process is regulated by a discrete controller. The paper considers the problem of stabilizing the periodic operation of such systems under event-driven switching. The key idea presented is to adjust switching surface parameters on-line to the current behavior of the continuous s...

This paper discusses the design of optimal feedback control laws for hybrid systems with autonomous (continuous) modes. The solution of similar problems, when the dynamic modes are non linear, is, in general, dependent on the initial conditions. The same problem affects the ”open loop” control based on the definition of the optimal switching times. In this work an algorithm is proposed, allowin...

2014 Three possible disclination models of a nucleation : on a sample surface ; over the whole sample thickness ; in the sample bulk ; describing the switching process in thin ferroelectric liquid crystal (FLC) samples are studied in the approximation of parallel smectic layers and corresponding critical values of electric field are estimated. The switching process between two uniform states of...

This work is motivated by the drug therapy scheduling problem in HIV infection. Using simplified switched linear system models of HIV mutation and treatment with certain class of symmetry and finite horizon cost functions, we demonstrate that the optimal state and costate trajectories lie on a sliding surface where infinitely fast switching may occur. Results suggest that in the absence of othe...

A delay-dependent H∞ variable structure control is presented for uncertain singular time-delay systems. System with mismatched norm-bounded uncertainties and mismatched norm-bounded external disturbances are considered. In terms of linear matrix inequalities (LMIs), we give a delay-dependent sufficient condition for the existence of switching surfaces, on which sliding mode dynamics is regular,...

The ongoing interest in fast liquid crystal (LC) modes stimulated by display technology and new applications has motivated us to study in detail the in-plane switching (IPS) vertically aligned (VA) mode. We have studied how the decrease of the period of the interdigitated electrodes (down to sub-micrometer scale) influences the switching speed, especially the LC relaxation to the initial homeot...