A closed loop bidirectional ac to ac buck boost converter circuit using power MOSFET is analyzed for reducing the output voltage sag and improving efficiency of the converter. The regenerative dc snubbers are used directly to power semiconductor switches to absorb energy stored in stray line inductances. These dc snubbers enhance the conversion efficiency as it has very simple structure consist...

This paper presents a combined phase-shift and frequency modulation scheme of a dual–active-bridge (DAB) ac– dc converter with power factor correction (PFC) to achieve zero voltage switching (ZVS) over the full range of the ac mains voltage. The DAB consists of a half bridge with bidirectional switches on the ac side and a full bridge on the dc side of the isolation transformer to accomplish si...

High step-up ratio DC-DC converters with megawatt ratings are of interest in wind turbine interfaces and high-voltage direct-current systems. The modular multilevel DC-DC converter based on the standard boost converter topology but with the normal single switches replaced by a number of capacitor-clamped sub-modules. The converter is operated in resonant mode with resonance between sub-module c...

This paper presents frequency reconfigurable dual band antenna for WiMAX and LTE 2500 applications using four PIN diode switches. The is compact in size with dimensions of 30 x 0.8 mm3 designed on FR-4 dielectric substrate a partial ground plane. fabricated operates the range (2.5-2.69 GHz 3.4-3.6 GHz) respectively.  frequencies can be controlled by diodes attained gain ranging 3.34-4.46 dBi. r...

In this paper, a bidirectional associative memory (BAM) model with second-order connections, namely second-order bidirectional associative memory (SOBAM), is first reviewed. The stability and statistical properties of the SOBAM are then examined. We use an example to illustrate that the stability of the SOBAM is not guaranteed. For this result, we cannot use the conventional energy approach to ...

In this paper, a stochastic approach is proposed for reliability assessment of bidirectional DC-DC converters, including the fault-tolerant ones. This type of converters can be used in a smart DC grid, feeding DC loads such as home appliances and plug-in hybrid electric vehicles (PHEVs). The reliability of bidirectional DC-DC converters is of such an importance, due to the key role of the expec...

EXtended Generalized Fat Trees (XGFT) are Bidirectional Multistage Interconnection Networks (BMIN). They are more scalable for different system sizes and different performance requirements than fat trees from which they have evolved. The improved scalability has been achieved by allowing switches with different number of ports to be used in different switch stages of these hierarchical networks...

This study is to investigate the short- and long-run causal relationship between agglomeration (localization and urbanization) economies and labor productivity in the manufacturing sector of 28 Iranian provinces over an 11-year period, 2001–2011. Fully Modified Ordinary Least Squares (FMOLS) method was used to estimate our long-run panel data model. The empirical findings suggested that localiz...