This paper describes the technical challenges tied to modeling and design optimization of the medium frequency transformer (MFT) for power electronic applications, namely emerging solid state transformers (SSTs). A detailed analysis and modeling of the phenomena governing the MFT electrical behavior as well as limiting the operation and design range is performed. A synthesis of all these models...

This paper presents a method for the design of shell-type, single-phase distribution transformers to obtain the manufacturing specifications. The method is simple, efficient and accurate. By an exhaustive analysis, it is concluded that the obtained solution is the global optimum. The following constraints are imposed: excitation current, no-load losses, total losses, impedance and efficiency. T...

In this paper, a compact tri-band impedance transformer by utilizing stubbed coupling line for matching a load at three arbitrary frequencies is proposed. The transformer is composed of two parts, and each part is constructed from parallel-coupled transmission lines. Two structures with different configurations of the proposed transformer have been given and analyzed. Then, the close-form equat...

Original scientific paper Measurement of grid voltage harmonic components is an important part of power quality measurements. Current high voltage transformers with iron core are not linear and cannot easily be used for accurate measurement of "polluted" voltages in wide frequency range. In this paper, design details of a new coreless voltage transformer for power quality measurement are given....

High-frequency current transformers are popular noninvasive inductive wideband sensors. Despite the simplicity in design and operational principle, implementation of such sensors for partial discharge (PD) applications requires careful consideration, particularly higher frequency range where traveling wave attenuation distortion relevant. First, role variables, including core materials, winding...

At high frequency, the winding losses of power transformer due to skin and proximity effects becomes a significant component in the loss calculation of the transformer efficiency. This paper examines the winding losses associated with these effects for planar-type low-profile transformers that are suitable for high frequency high density soft switching power supply application. The transformer ...

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC rectifier for future avionics applications. Simpler converter dynamics, high switching frequency, zerovoltage-switching, and a single-layer transformer construction result in an efficiency of 90% and a very low total harmonic distortion over 400 -800 Hz line frequency variation.

Practical aspects of design and application radio frequency (RF) transformers in an ultrasonic system excitation channel are analysed. Design steps are discussed for those willing to design their own transformer an for excitation channel. Investigation has been carried out on what generator parameters can be obtained if instead of a purely active output stage the impedance matching RF transform...

A two stage model is used to model the high frequency transient behavior of two winding transformers. The assumed transformer model’s parameters are estimated using the maximum likelihood estimation technique and the Kalman filter based on the time response data. Simulations are carried out using the frequency response data generated based on an assumed transformer model. The transfer function ...