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One of the major issues in a single phase inverter topology is the 120Hz ripple which needs large decoupling capacitors. Big bulky electrolytic capacitors can be an issue in applications where compact size and high power density are requirements such as solar converter chargers. In z source inverter systems, the design of the impedance network is critical. In single phase z source inverter systems,...
In this paper, a single stage highly efficient photovoltaic grid interconnected charging infrastructure has been designed for off-board DC charging for electric vehicles. This paper starts with the design of a single phase H-bridge quasi-z-source inverter (qZSI), component design and the pulse width modulation technique used. Then it discusses the control techniques used to control the power flow...
A body-worn passive planar harmonic tag for sensing and uniquely isolating human respiratory motion using a Doppler radar has been designed, fabricated and tested. Agilent's advanced design system 2006 provided a simulation and performance evaluation platform. This design flow is applicable for any tag design and not just dipoles which has been the design of choice for others in the past. The tag...
Twelve pulse nonlinear loads are generally employed in high power applications for large AC and DC drives. These 12-pulse rectifiers are utilized for high power loads because of comparatively less supply current Total Harmonic Distortion (THD) compared to 6-pulse rectifier at front end. However, both 6-pulse as well as 12-pulse converters at front end behaving as nonlinear loads do not meet IEEE 519...
Adjustable speed drives (ASD) employing induction motors are widely used in the industrials and process control in the form of varied applications such as fans, compressors, pumps etc. They are energy efficient and can result in substantial energy saving when properly installed. However, they inject high harmonic content into current drawn from the AC system. This paper deals with the application...
Solid state electronics is used to increase the energy efficiency of electrical load devices. The harmonic distortion of current is increasing with the enhanced use of nonlinear loads i.e. solid state devices. Examples of nonlinear loads are personal computer, laptop, laser printer, fax machine, television set (TV), fluorescent tube with electronic ballast, compact fluorescent lamp, battery charger,...
A harmonic radar employing the use of harmonic passive RF tags can be successfully used to isolate the human respiration from environmental clutter. This paper describes the successful use of heterodyne receiver architecture with Doppler radar to track the heart-rate of a human being using passive body-worn harmonic tags in presence of a controlled noise generator at distances up to 120 cm. The heterodyne...
Harmonics are the by-products of modern electronic devices i.e. nonlinear loads which create harmonics by drawing current in abrupt short pulses, rather than in a smooth sinusoidal manner. Any distribution circuit feeding nonlinear loads will contain some degree of harmonic frequencies. Due to the rapidly increasing number of non-linear loads in distribution systems, the harmonic distortion of the...
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