—Transformer terminal equivalents obtained via admittance measurements are suitable for simulating high-frequency transient interaction between the transformer and the network. This paper augments the terminal equivalent approach with a measurement-based voltage transfer function model which permits calculation of voltages at internal points in the regulating winding. The approach is demonstrat...

This work presents the design, simulation, and implementation of a low-power electronic transformer, which output effective voltage can be controlled wirelessly through WIFI, via user interface on mobile phone. The methodology used in this project consists 4 stages, rectifier, an inverter, inverter’s control system, ferrite reducer. inverter has full-bridge design was implemented using MOSFET. ...

This paper is focused on a design of high-voltage (HV) generator, which proposed for high-frequency irreversible electroporation (H-FIRE). The generator produces bursts bipolar symmetrical pulses. Most HV sources used cell are based controlled discharge capacitor into resistive load. solution very simple, but it associated with certain risk an uncontrolled the capacitor. We present different ty...

s – Detection of minor faults in power transformer active part is essential because minor faults may develop and lead to major faults and finally irretrievable damages occur. Sweep Frequency Response Analysis (SFRA) is an effective low-voltage, off-line diagnostic tool used for finding out any possible winding displacement or mechanical deterioration inside the Transformer, due to large electro...

A 2.4 GHz radio frequency receiver front end with an on-chip transformer compliant with IEEE 802.11b/g standards is presented. Based on zero-IF receiver architecture, the front end comprises a variable gain common-source low noise amplifier with an on-chip transformer as its load and a high linear quadrature folded Gilbert mixer. As the load of the LNA, the on-chip transformer is optimized for ...

To study the voltage distribution in transformer windings under VFTO, a model for transformer windings has been developed based on Multi-conductor Transmission-Lines (MTLs) theory and the computing equations of the model based on FiniteDifference Time-Domain method (FDTD) is deduced. The Vector Fitting method is adopted to treat the frequency-dependent parameter by expanding the time-domain for...

Partial discharges (PD) are recognized as the main cause of the inner insulation deterioration process in power transformers. Therefore, the optimum inner insulation design is one of the challenges a transformer designer is faced with. Transformer strength, especially during transient conditions, is a criterion for transformer insulation designers. This challenge has made designers initiate and...

The impact of initial conditions on the initiation of fundamental frequency ferroresonance is investigated. The investigation is carried out by simulating the behaviour of the mathematical model of ferroresonant circuit realized in the laboratory. The initiation of fundamental frequency ferroresonance is investigated by varying the values of phase angle and amplitude of voltage source in order ...

Piezoelectric transformers (PT) are an alternative to wire wound magnetic transformers because of numerous advantages i.e. being the electromechanical energy conversion, low EMI, a compact and low design, as well as a high potential of high efficiency and power density. The last two decades of research into piezoelectric transformer (PT) based power converters have led to some extensive improve...

The two-inductor boost converter with an auxiliary transformer has been previously proposed for the applications where a large difference between the input and the output voltages is required. In the isolated version of the converter implementation, however, the leakage inductance of the high frequency isolation transformer presents an adverse effect and will cause significant voltage ringing o...