One of the most efficient lighting technology is based on light-emitting diodes (LEDs). Common LED drivers with AC-input (50-60Hz) usually require a bulk electrolytic capacitor to decrease low-frequency ripple in the output. However, the critical element that limits the lifespan of the LED driver is the electrolytic capacitor. An isolated off-line LED driver is proposed in this paper, in which ...

This research proposes the combination of a dual-loop non-organic Rankine cycle (DNORC) with an internal combustion engine to increase the output power of the recovery system by focusing on the increase in the energy input and system efficiency. In doing so, it investigates the strategy of increasing the mean effective temperature of heat addition in the high-temperature Rankine cycle (HTRC) (t...

This paper is motivated by a class of positive systems with an input that subject to unknown state-dependent power law delay as well saturation. For example, biological networks have non-negative protein concentration states. Mass action kinetics in these result behavior, while complex interactions cause signal propagation delays. Incomplete network characterization makes state-dependence unkno...

In recent years a host of “new” current-mode continuous-time filters have been proposed. Although there is widespread acceptance of the premise that current-mode structures are more suitable for high frequency and low voltage applications than their voltage-mode counterparts, a valid comparison of voltage-mode and current-mode structures is conspicuously absent in the literature. In an attempt ...

Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to a loosely coupling characteristic, the variation of coupling coefficient will certainly affect the performance of impe...

Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced). Reactive power is the main component which overloads power lines and brings excessive thermal stress to conductors. If the reactive power is optimized, it can significantly lower th...

This paper presents the design and implementation of an LED lighting module powered by a wireless power transfer system. The overall system achieves an efficiency of 82% with an output power of 36 W when the load resistance in the receiver is 30 Ω, which is the turn-on resistance of the LED lighting module. The transmitter of the system adopts ClassE power amplifier structure instead of Class-D...

In this paper, a full-bridge boost power converter topology is studied for power factor control, using output higher order sliding mode control. The AC/DC converters are used for charging the battery and super-capacitor in hybrid electric vehicles from the utility. The proposed control forces the input currents to track the desired values, which can controls the output voltage while keeping the...

A parametric analysis is an analysis whose input and output are parametrized with a number of parameters which can be instantiated to abstract properties after analysis is completed. This paper proposes to use Cousot and Cousot’s Cardinal power domain to capture functional dependencies of analysis output on its input and obtain a parametric analysis by parametrizing a non-parametric base analys...

Many people who are mobility impaired are, for a variety of reasons, incapable of using an ordinary wheelchair. In some instances, a power wheelchair also cannot be used, usually because of the difficulty the person has in controlling it (often due to additional disabilities). This paper describes two low-cost robotic wheelchair prototypes that assist the operator of the chair in avoiding obsta...