open circuit test
... According to superposition theorem ,V2 source is assumed to be short circuited , then the two transformers will appear in open circuit to source V1. This is due to the fact that the secondary windings are in phase opposition and so no current can flow through them. So the total current drown from so ...
... According to superposition theorem ,V2 source is assumed to be short circuited , then the two transformers will appear in open circuit to source V1. This is due to the fact that the secondary windings are in phase opposition and so no current can flow through them. So the total current drown from so ...
Document
... many actuators are capacitive or inductive (such as motors and solenoids) these create particular problems – particularly when using switching techniques we will return to look at these problems when we have considered capacitor and inductors in more detail ...
... many actuators are capacitive or inductive (such as motors and solenoids) these create particular problems – particularly when using switching techniques we will return to look at these problems when we have considered capacitor and inductors in more detail ...
Design and analysis of an underwater inductive coupling power
... assessing the overall efficiency of ICPT devices is very important. In the literature, efficiency is primarily evaluated by experimental measurements (Kojiya et al., 2004; Han et al., 2007; Papastergiou and Macpherson, 2007a; Li et al., 2010). A few studies (Taheri et al., 2011; Zargham and Gulak, 2 ...
... assessing the overall efficiency of ICPT devices is very important. In the literature, efficiency is primarily evaluated by experimental measurements (Kojiya et al., 2004; Han et al., 2007; Papastergiou and Macpherson, 2007a; Li et al., 2010). A few studies (Taheri et al., 2011; Zargham and Gulak, 2 ...
IB 12 RECTIFYING AC Rectification: the process of converting an
... 2. Not all the flux from primary coil is linked to secondary coil. The purpose of the core is to concentrate and link as much of the flux from the primary to the secondary coil. 3. The core warms up as result of cycles of flux changes. 4. Small currents are induced in core (eddy currents). Method of ...
... 2. Not all the flux from primary coil is linked to secondary coil. The purpose of the core is to concentrate and link as much of the flux from the primary to the secondary coil. 3. The core warms up as result of cycles of flux changes. 4. Small currents are induced in core (eddy currents). Method of ...
Chapter 23 = Potential Lecture
... • Hundreds of deep sea HVDC systems built • Some HVDC is now 1 mega Volt • Future of DC is for long distance high power applications for now • And of course low voltage systems using batteries – ie cell phones • Solar and Wind power are more naturally DC but current grid ties convert them to AC ...
... • Hundreds of deep sea HVDC systems built • Some HVDC is now 1 mega Volt • Future of DC is for long distance high power applications for now • And of course low voltage systems using batteries – ie cell phones • Solar and Wind power are more naturally DC but current grid ties convert them to AC ...
THE AUSTRALIAN NATIONAL UNIVERSITY Gerard Borg RADIOFREQUENCY ENGINEERING SAMPLE QUESTIONS
... (1) Gauss’ Law Given that capacitance is defined as the ratio of charge Q to voltage V from two points in a circuit where +Q is located at one point and and −Q is located at another, use Gauss’ law to show that the capacitance of a parallel plate capacitor with plates of area A and separation d is g ...
... (1) Gauss’ Law Given that capacitance is defined as the ratio of charge Q to voltage V from two points in a circuit where +Q is located at one point and and −Q is located at another, use Gauss’ law to show that the capacitance of a parallel plate capacitor with plates of area A and separation d is g ...
Automatic Street Light Control
... brightness at ten times lower current while Super Bright diodes produce more intensive light than Standard ones. Since the 8051 microcontrollers can provide only low input current and since their pins are configured as outputs when voltage level on them is equal to 0, direct connectining to LEDs is ...
... brightness at ten times lower current while Super Bright diodes produce more intensive light than Standard ones. Since the 8051 microcontrollers can provide only low input current and since their pins are configured as outputs when voltage level on them is equal to 0, direct connectining to LEDs is ...
A linear polarization converter with near unity efficiency in
... where 0 / 0 is the wave impedance of free space. On condition that the incident port surface Sin is far enough from the metallic resonator and there is no co-polarized reflective wave on the incident port surface, we obtain ...
... where 0 / 0 is the wave impedance of free space. On condition that the incident port surface Sin is far enough from the metallic resonator and there is no co-polarized reflective wave on the incident port surface, we obtain ...
Efficiently harvesting energy from temperature differences in order to
... Presented at Wireless Congress, Munich November 2014 ...
... Presented at Wireless Congress, Munich November 2014 ...
An Insight into the Evolution of Direct Current Systems
... Probable advantages of AC were observed already in 1821 when Michael Faraday carried out the experiments and realized that the change of a magnetic field within time induces a current in a nearby locating wire. This discovery was the basic concept for transformers which are being applied to increase ...
... Probable advantages of AC were observed already in 1821 when Michael Faraday carried out the experiments and realized that the change of a magnetic field within time induces a current in a nearby locating wire. This discovery was the basic concept for transformers which are being applied to increase ...
EV Low Voltage Wiring
... ► Assure driver’s foot is off the accelerator pedal at ignition ► Turn on a vacuum pump with ignition, if necessary ► Disconnect ...
... ► Assure driver’s foot is off the accelerator pedal at ignition ► Turn on a vacuum pump with ignition, if necessary ► Disconnect ...
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.