PF Penalty - radio works rf consulting
... As motors operate, reactive power is “pulled” and “pushed” to and from the capacitor by the motor at 60 cycles per second Capacitors store & release what motors need to function more efficiently Capacitors fine tune the motors & eliminate the I² R Loss Electricity reclaimed and recycled by t ...
... As motors operate, reactive power is “pulled” and “pushed” to and from the capacitor by the motor at 60 cycles per second Capacitors store & release what motors need to function more efficiently Capacitors fine tune the motors & eliminate the I² R Loss Electricity reclaimed and recycled by t ...
AN4705, Low-Power Wireless Charger Transmitter Design
... 5.2 Power stage design 5.2.1 Full-bridge inverter design Figure 8 shows the schematic of a full-bridge inverter used by the wireless charger transmitter. The allowed input voltage range is 4.5–19.5 V and the input current is from 0–2 A (maximum at 5 V input). LCL resonant circuit is connected to mid ...
... 5.2 Power stage design 5.2.1 Full-bridge inverter design Figure 8 shows the schematic of a full-bridge inverter used by the wireless charger transmitter. The allowed input voltage range is 4.5–19.5 V and the input current is from 0–2 A (maximum at 5 V input). LCL resonant circuit is connected to mid ...
ESR (Electron Spin Resonance)
... The first two are tube type oscillators and are somewhat noisy and/or unstable. The latter two are solid state oscillators, and are quiet, stable and easy to use. For this experiment we will use the most stable phase locked bipolar transistor oscillator. SOLID STATE MICROWAVE RF OSCILLATORS The soli ...
... The first two are tube type oscillators and are somewhat noisy and/or unstable. The latter two are solid state oscillators, and are quiet, stable and easy to use. For this experiment we will use the most stable phase locked bipolar transistor oscillator. SOLID STATE MICROWAVE RF OSCILLATORS The soli ...
Secondary: 5E Date: 20/06/2011
... magnetic field pattern formed around a flat circular current-carrying coil, in the plane as shown? ...
... magnetic field pattern formed around a flat circular current-carrying coil, in the plane as shown? ...
Presentation on
... thin copper wire, and its resistance can change significantly when its temperature changes. – The heating effect of the coil current may be enough to produce a resistance change, which will introduce an error. – To minimize the error, a swamping resistance made of manganin or constantan is connected ...
... thin copper wire, and its resistance can change significantly when its temperature changes. – The heating effect of the coil current may be enough to produce a resistance change, which will introduce an error. – To minimize the error, a swamping resistance made of manganin or constantan is connected ...
Starters (Level 2) File - Totton College
... Positive voltage applied to side A of the coil - current flows from A to B. Creates a magnetic field around the coil that reacts with the main magnetic field, causing the coil to turn counter-clockwise. When the coil gets to the vertical position the carbon brushes reach the gap in the commutator - ...
... Positive voltage applied to side A of the coil - current flows from A to B. Creates a magnetic field around the coil that reacts with the main magnetic field, causing the coil to turn counter-clockwise. When the coil gets to the vertical position the carbon brushes reach the gap in the commutator - ...
Substation Equipments
... Fig (a) shows the use of isolators in a typical sub-station. The entire sub-station has been divided into V sections. Each section can be disconnected with the help of isolators for repair and maintenance. For instance, if it is desired to repair section No. II, the procedure of disconnecting this ...
... Fig (a) shows the use of isolators in a typical sub-station. The entire sub-station has been divided into V sections. Each section can be disconnected with the help of isolators for repair and maintenance. For instance, if it is desired to repair section No. II, the procedure of disconnecting this ...
Document
... coupling a result of the changing magnetic flux lines of one coil cutting through the second coil. Turns ratio The ratio of the turns in the secondary winding to the turns in the primary winding. Reflected The resistance of the secondary circuit resistance reflected into the primary circuit. Impedan ...
... coupling a result of the changing magnetic flux lines of one coil cutting through the second coil. Turns ratio The ratio of the turns in the secondary winding to the turns in the primary winding. Reflected The resistance of the secondary circuit resistance reflected into the primary circuit. Impedan ...
150Lecture 7 Magnetism/Electromagnetism Lecture Notes Page
... INDUCED VOLTAGE P.185 WE KNOW THAT CURRENT CARRYING CONDUCTORS PRODUCT A MAGNETIC FIELD. CONSIDER THE OPPOSITE. A MAGNETIC FIELD CAN INDUCT A VOLTAGE/CURRENT IN A WIRE. THIS IS THE BASES OF ALL ELECTRIC MOTORS. ...
... INDUCED VOLTAGE P.185 WE KNOW THAT CURRENT CARRYING CONDUCTORS PRODUCT A MAGNETIC FIELD. CONSIDER THE OPPOSITE. A MAGNETIC FIELD CAN INDUCT A VOLTAGE/CURRENT IN A WIRE. THIS IS THE BASES OF ALL ELECTRIC MOTORS. ...
the biquad filter
... The Q-factor and the resonant frequency are not independent in this circuit. For high frequencies, the bandwidth will be the same as that for low frequencies. This, in general, is not a desirable feature. For example, in an audio mixing desk, the equalising section would use a state-variable circuit ...
... The Q-factor and the resonant frequency are not independent in this circuit. For high frequencies, the bandwidth will be the same as that for low frequencies. This, in general, is not a desirable feature. For example, in an audio mixing desk, the equalising section would use a state-variable circuit ...
Physics O Level Notes 2
... iron core, which is cut by the secondary coil. Hence, an E.M.F. is induced in the secondary coil. • The soft iron core helps to concentrate the magnetic field through the coils. • A step-up transformer is used near power stations to increase the voltage and to decrease current so there’s no overheat ...
... iron core, which is cut by the secondary coil. Hence, an E.M.F. is induced in the secondary coil. • The soft iron core helps to concentrate the magnetic field through the coils. • A step-up transformer is used near power stations to increase the voltage and to decrease current so there’s no overheat ...
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.