William Gerard Hurley

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State-of-charge (SOC) determination is an increasingly important issue in battery technology. In addition to the immediate display of the remaining battery capacity to the user, precise knowledge of SOC exerts additional control over the charging/discharging process, which can be employed to increase battery life. This reduces the risk of overvoltage and(More)
Magnetic levitation of a metallic sphere motivates and inspires students to investigate and understand the fundamental principles of electrical engineering, such as magnetic design, circuit design, and control theory. This paper describes the operation of a pulsewidth modulation converter in a magnetic suspension system. The pulsewidth-modulated (PWM)(More)
For many years, intensive research has been undertaken to increase the life of valve-regulated lead–acid (VRLA) batteries. Overcharging results in excessive temperature in the battery, which degrades the chemical composition of the electrolyte. When the battery reaches the end-of-charge state, the energy being supplied to the battery is no longer consumed(More)
A Web-based laboratory exercise with remote access is presented, through which a student of Electrical/Electronic Engineering is introduced in both a theoretical and practical way, to many fundamental aspects of power electronics. The system is flexible and can expand the range of laboratory exercises where fullscale laboratories are not feasible. In the(More)
The valve-regulated lead-acid battery has been the work horse of standby applications for several decades. Float charging is normally implemented in these systems. However, float charging tends to overcharge the battery, causing water loss and grid corrosion which shorten the service life of the battery. This limitation may be avoided by using cell voltage(More)
It is well established that magnetic components may be reduced in size by operating at high frequency. Miniaturization of magnetic components is ideally suited to microelectronics technologies such as thick film, which lend them to planar geometries. This paper describes new analytical models, which predict inductanceand frequency-dependent eddy-current(More)
Maximum Power Transfer in solar photovoltaic applications is achieved by impedance matching with a dc-dc converter with maximum power point tracking by the incremental conductance method. Regulation and dynamic control is achieved by operating with continuous conduction. It can be shown that under stable operation, the required output inductor has an(More)
The magnetic shunt is generally inserted in a planar transformer to increase the leakage inductance, which can be utilized as the series inductor in resonant circuits such as the LLC resonant converter. This paper presents a calculation methodology for the leakage inductance of the transformer with a magnetic shunt by means of the stored magnetic energy in(More)
In the LLC resonant converter, the air gap is generally positioned in the core of the transformer for proper magnetizing inductance. Traditional transformer design methods assume infinite permeability of the core and no energy stored in the core. The improved design methodology for the gapped transformer is proposed with the optimum relative permeability(More)
This paper presents an improved methodology for selecting a core for higher power inductors, by using a more advanced approach to select initial values for the Window Utilization Factor (WUF) and the Core to DC Copper Loss Ratio (CCLR) as the two key starting parameters for the inductor design process. The paper identifies the reasons why the conventional(More)