IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
... In this paper, we have introduced the concept of rectennas and reviewed its history briefly. Some important design issues of rectennas have also been addressed. Moreover, a detailed discussion on the rectenna efficiency has been conducted. It is clear that to achieve high energy conversion efficienc ...
... In this paper, we have introduced the concept of rectennas and reviewed its history briefly. Some important design issues of rectennas have also been addressed. Moreover, a detailed discussion on the rectenna efficiency has been conducted. It is clear that to achieve high energy conversion efficienc ...
Oscillographic TV Hacking
... These are more likely to have safely mechanisms that power down the device if it notices something wrong. Additionally, these types of stereos can be prone to blowing out if used improperly. You can find plenty of old stereo amplifiers at thrift stores. Also, plate and car stereo amplifiers will wor ...
... These are more likely to have safely mechanisms that power down the device if it notices something wrong. Additionally, these types of stereos can be prone to blowing out if used improperly. You can find plenty of old stereo amplifiers at thrift stores. Also, plate and car stereo amplifiers will wor ...
Baluns
... • A Current Balun is one whose output currents are equal and opposite (balanced with respect to ground). • With the exception of the 1:1 current balun, current baluns are more expensive to construct than voltage baluns and thus are les widely used. • Current baluns may be made with RF transformers o ...
... • A Current Balun is one whose output currents are equal and opposite (balanced with respect to ground). • With the exception of the 1:1 current balun, current baluns are more expensive to construct than voltage baluns and thus are les widely used. • Current baluns may be made with RF transformers o ...
ELECTROTECHNOLOGY N3
... The operation of direct current motors and generators is not only the same in principle, but the practical design does not differ much either. A direct current motor can be used as a generator and vice versa. However, if we consider the purpose of each machine and where it is used, there are a few d ...
... The operation of direct current motors and generators is not only the same in principle, but the practical design does not differ much either. A direct current motor can be used as a generator and vice versa. However, if we consider the purpose of each machine and where it is used, there are a few d ...
Nineteenth-Century Developments in Coiled Instruments and
... the effect could be enhanced by inserting an iron rod into the hollow interior, and how it could be brought about (without a battery) simply by moving a bar magnet into the tube.4 But the two wire coils of the eventual induction instrument bifurcated in ways that did not originate with Faraday’s pro ...
... the effect could be enhanced by inserting an iron rod into the hollow interior, and how it could be brought about (without a battery) simply by moving a bar magnet into the tube.4 But the two wire coils of the eventual induction instrument bifurcated in ways that did not originate with Faraday’s pro ...
Experiment 6 - UniMAP Portal
... producing a net counterclockwise rotation of the magnetic fields (c) The resulting torque-speed characteristic. In a split-phase induction motor, the current in the auxiliary windings always peaks before the current in the main winding and therefore the magnetic field from the auxiliary winding alwa ...
... producing a net counterclockwise rotation of the magnetic fields (c) The resulting torque-speed characteristic. In a split-phase induction motor, the current in the auxiliary windings always peaks before the current in the main winding and therefore the magnetic field from the auxiliary winding alwa ...
TOOL FOR QUALITY TESTING OF RAW MATERIAL OF
... for characterization. A pulsed magnetometer is useful for testing high-performance magnets due to their ability to produce higher magnetic fields. The basic geometry, coil winding configuration and input currents of the pulsed field magnetometer are calculated using FEM and MATLAB/Simulink. The whol ...
... for characterization. A pulsed magnetometer is useful for testing high-performance magnets due to their ability to produce higher magnetic fields. The basic geometry, coil winding configuration and input currents of the pulsed field magnetometer are calculated using FEM and MATLAB/Simulink. The whol ...
Commercial Powersines COMEC
... Phase controllers are based on thyristors to control output voltage. These devices control RMS voltage by chopping part of each voltage cycle. They have high electric distortion especially with non-linear loads, require over-sized filters, very poor input line harmonics and will not handle surge cur ...
... Phase controllers are based on thyristors to control output voltage. These devices control RMS voltage by chopping part of each voltage cycle. They have high electric distortion especially with non-linear loads, require over-sized filters, very poor input line harmonics and will not handle surge cur ...
Aalborg Universitet Electronics-Based Power Systems
... low-frequency range, where the series LC-filter is predominantly capacitive, rather than the usual inductive characteristics that exist between voltage-source converters and the grid (or load). This low-frequency challenge can fortunately be resolved by the proposed fourth-order resonant controller, ...
... low-frequency range, where the series LC-filter is predominantly capacitive, rather than the usual inductive characteristics that exist between voltage-source converters and the grid (or load). This low-frequency challenge can fortunately be resolved by the proposed fourth-order resonant controller, ...
Resonant inductive coupling
Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC circuits. Resonant transformers are widely used in radio circuits as bandpass filters, and in switching power supplies. Resonant inductive coupling is also being used in wireless power systems. Here the two LC circuits are in different devices; a transmitter coil in one device transmits electric power across an intervening space to a resonant receiver coil in another device. This technology is being developed for powering and charging portable devices such as cellphones and tablet computers at a distance, without being tethered to an outlet.Resonant transfer works by making a coil ring with an oscillating current. This generates an oscillating magnetic field. Because the coil is highly resonant, any energy placed in the coil dies away relatively slowly over very many cycles; but if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away. The fields used are predominately non-radiative, near fields (sometimes called evanescent waves), as all hardware is kept well within the 1/4 wavelength distance they radiate little energy from the transmitter to infinity.One of the applications of the resonant transformer is for the CCFL inverter. Another application of the resonant transformer is to couple between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by tuned transformers in the intermediate-frequency amplifiers. The Tesla coil is a resonant transformer circuit used to generate very high voltages, and is able to provide much higher current than high voltage electrostatic machines such as the Van de Graaff generator. Resonant energy transfer is the operating principle behind proposed short range (up to 2 metre) wireless electricity systems such as WiTricity or Rezence and systems that have already been deployed, such as Qi power transfer, passive RFID tags and contactless smart cards.