Piezoelectric Sound Components
... The piezo elements may be driven with sinusoidal, pulsed, or square waves. A sine wave will cause the device to operate at a frequency lower than the resonant frequency with a lower SPL. This is due to the loss of energy through the lag time between peak deflections. A square wave will produce highe ...
... The piezo elements may be driven with sinusoidal, pulsed, or square waves. A sine wave will cause the device to operate at a frequency lower than the resonant frequency with a lower SPL. This is due to the loss of energy through the lag time between peak deflections. A square wave will produce highe ...
Radio Frequency Light Source Seminar
... impedance is much larger than the plasma impedance. Therefore, the voltage applied to the lamp is mainly dropped in the sheaths, and sheath impedance controls the discharge current of a capacitive RF discharge. A significant dc voltage is developed in the RF sheaths as a result of RF voltage rectifi ...
... impedance is much larger than the plasma impedance. Therefore, the voltage applied to the lamp is mainly dropped in the sheaths, and sheath impedance controls the discharge current of a capacitive RF discharge. A significant dc voltage is developed in the RF sheaths as a result of RF voltage rectifi ...
9
... Switch-mode power supplies are employed in dc voltage step-up or step-down, as several dc-dc converters can be used for this purpose. Soft switching PWM topologies [3, 4, 5,6] have advantages such as low switching losses, Constant frequency of operation and simple control, However they have load lim ...
... Switch-mode power supplies are employed in dc voltage step-up or step-down, as several dc-dc converters can be used for this purpose. Soft switching PWM topologies [3, 4, 5,6] have advantages such as low switching losses, Constant frequency of operation and simple control, However they have load lim ...
Generation and Net Metering (Form 1214)
... (Project side) of the power transformer, but may instead be connected on the secondary (Utility side). VT’s are required on the secondary of the power transformer if a 59N is required for an ungrounded secondary connection. IEEE std 1547 requirements for voltage and frequency must be met at the PCC. ...
... (Project side) of the power transformer, but may instead be connected on the secondary (Utility side). VT’s are required on the secondary of the power transformer if a 59N is required for an ungrounded secondary connection. IEEE std 1547 requirements for voltage and frequency must be met at the PCC. ...
J.M. Rivas, O. Leitermann, Y. Han, and D.J. Perreault, “A Very High Frequency dc-dc Converter Based on a Class Phi-2 Resonant Inverter,” IEEE Transactions on Power Electronics , Vol. 26, No. 10, pp. 2980-2992, Oct. 2011.
... being driven by a sinusoidal current source of magnitude Irec . The resonant inductor LR provides a path for the dc current and resonates with the capacitances CD and CEXT shown in the figure. CD represents the diode nonlinear capacitance while CEXT accounts for external capacitance added plus the p ...
... being driven by a sinusoidal current source of magnitude Irec . The resonant inductor LR provides a path for the dc current and resonates with the capacitances CD and CEXT shown in the figure. CD represents the diode nonlinear capacitance while CEXT accounts for external capacitance added plus the p ...
A magnetically isolated gate driver for high
... upon the gate drive current and thhe instantaneous gate-drain capacitance, which iss in turn dependent upon the instantaneous drain-souurce voltage. Devices supporting larger instantaneeous drain-source voltage experience faster drain-soource voltage decay, therefore equilibrium is rapiidly reached ...
... upon the gate drive current and thhe instantaneous gate-drain capacitance, which iss in turn dependent upon the instantaneous drain-souurce voltage. Devices supporting larger instantaneeous drain-source voltage experience faster drain-soource voltage decay, therefore equilibrium is rapiidly reached ...
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.