Design Of Pulse Transformer Research Articles

Proyecto de transformadores de pulsos de potencia

Se presenta un método para el diseño de transformadores de pulsos de alta potencia basado en consideraciones analíticas que conducen a ecuaciones de dimensionamiento que permiten el proyecto en un solo un paso, que puede mejorarse luego mediante iteración. Se incluye un ejemplo de procedimiento de diseño de transformador utilizado en un generador de pulsos para electroporación.

Portable DC Supply Powered from Battery

This contribution refers about a design and development of a regulated DC-DC converter with pulse transformer, which is powered from a battery or an on-board car network. This converter with adjustable output voltage and current value can supply many appliances. The design of pulse transformer, secondary rectifier, output filter, switching transistors, and control circuits is included.

High‐voltage pulse transformer for IOT modulators

Neutron sources like European Spallation Source consist of linear proton accelerator and beam target. The linear accelerator is supplied by inductive output tubes (IOTs) or klystrons that require high-voltage DC supply (40 kV). This study describes the design and experimental evaluation of high-voltage dry-isolation pulse transformer design evaluation prototype for interleaved IOT supply modules. In order to withstand high-voltage stress, a modular secondary winding module with multistage voltage field equalisation are designed. Inter-winding connections are realised in the air as the separate winding outputs are routed together through common high-voltage isolators. The novelties of the current manuscript are new pulse transformer design and the experimental work. Experiments with full-scale prototype verified the advantages and revealed, also, some drawbacks of this construction. Proposed transformer design could be used not only in IOT or klystron power supplies but also in high-voltage DC/DC or AC/AC converters and power electronic transformers, used in the medium-voltage distribution grids.

Optimization Design of a Repetitive Nanosecond Pulse Generator Based on Saturable Pulse Transformer and Magnetic Switch

Saturable pulse transformer (SPT) and magnetic switch (MS) are widely used together in pulse generators (PGs). It is easy to obtain a desirable output with a high voltage and low rise time when choosing the suitable PG topology. A compact, unipolar, and repetitive high-voltage nanosecond PG, which is based on SPT and MS, is designed and constructed. The operation principles of the resonant charging based on SPT and MS are described. The design and performance optimization of the magnetic components including SPT and MS are presented. The minimum volume of the SPT is derived and verified in the experiment. The core volume and turns of the MS are determined both considering the charging process and the output characteristic. The saturation times of the pulse transformer and MS can be optimally determined based on the $B$ – $H$ curve, which is obtained under the same working conditions. It reveals that the design and performance optimization methods of the SPT and MS are reasonable and can be used to guide the design of pulse transformers and MSs in pulsed power, power electronics, and industrial electronics.

Optimal Design and Experimental Study of Pulse Transformers With Fast Rise Time and Large Pulse Duration

Pulsed power systems often use a pulse transformer to generate high voltage pulses in some application such as radar systems, linear accelerators, and klystron modulators. Parasitic parameters include leakage inductance and capacitances are crucial for output waveform of pulse transformers. To ensure a rectangular pulse shape with a fast rise time, a required small overshoot and an acceptable voltage droop, theoretical calculation based on MATLAB is studied to optimize the design of the pulse transformer in this paper. Based on the theoretical calculation results, Finite Element Method simulations of magnetic and electric fields are carried out to obtain a more precise model for designing the transformer. Additionally, as the pulse transformer related in this paper works on the single forward state, a dc reset circuit, which can improve the utilization of the core material is implemented. Finally, accurate simulations of the pulse system equivalent circuit based on SABER are implemented. Meanwhile, output waveforms of pulse systems with different parasitic parameters and variable load are discussed. The simulation and experiment results showed that the optimum design of pulse transformer based on MATLAB programming and SABER simulation is effective to reduce the rise time of rectangular pulse shape to 1.5 μs while the pulse duration is as large as 200 μs.

Review of High Power Pulse Transformer Design

Abstract Vacuum devices generally work under high power pulse voltage of order 103 V to 106 V, and this pulse voltage could be generated by high power pulse transformer. Relatively, pulse transformer has the advantages of compact structure and excellent repetitiveness. It is expected of short rise-time, wide pulse-width and high energy transferring efficiency in most applications. Aiming at this purpose, it is feasible to select magnetic core with high permeability and high saturation magnetic flux density, use closed core and take some special measures to diminish leakage inductance in the making-process. This paper is a brief summary of high power pulse transformer design. In this paper, the principle, types and characteristics specification of high power pulse transformer are presented, and the design methods of electrical, magnetic and structure parameters are summarized. The methods of shortening rise time, diminishing droop and expanding output pulse-width (electrical parameter design), testing magnetic core materials (magnetic parameter design) and minimizing leakage inductance (structure parameter design) are emphasized.

Properties of Reset Cores in Radar Pulse Transformers

This paper outlines permeability and loss measurements on large uncut toroidal cores of Hipersil and Supermendur alloys. With forced cooling, large increments of core induction can be utilized; with a reset core, pulse permeability is much higher than it is in cut cores, and alters pulse transformer design radically. At inductions up to 24 kgauss, pulse permeability of fully oriented Hipersil and Supermendur alloys were about 6000, compared to approximately 1500 for cut cores at lower flux densities. It appears practicable from these tests to operate Hipersil alloy with excursions of induction up to 30 kgauss and Supermendur alloy up to 40 kgauss, and to reduce pulse transformer weight by 80%.

Graded windings for pulse transformers

The paper provides a comparison of conventional with graded windings used in pulse-transformer design. A conventional winding is defined as one in which the interlayer dielectric thickness is constant over the winding length, while the graded winding is defined as one in which the interlayer dielectric thickness varies linearly over the winding length.General theoretical considerations are laid down, and four winding types are described in detail.One of the major advantages obtainable with graded windings, particularly where high potentials are concerned, is a reduction in the core volume required to meet a given specification.

Digital computer design of pulse transformers

The development of pulsed radar created a need for a relatively new type of transformer, one that transforms the energy in a pulse with an approximately rectangular shape and a time duration in the order of microseconds.1 A good deal of experimental work has been done in this field, which has evolved a trial and error method of designing pulse transformers.1?3 This method is tedious and time consuming since it involves the use of many interdependent mathematical calculations and the necessity of making these same calculations over and over again before a satisfactory design is obtained.

A turns index for pulse transformer design

A turns index for pulse transformer design

A turns index for pulse transformer design

FOR a good many years designers of power transformers and distribution transformers have had a guide number to use in starting their first design.1, 2 This is expressed by the equation Vt = K?kva where Vt is the volts per turn to use in starting the first design; K is a constant which may vary between relatively narrow limits; and kva is the kilovolt-ampere rating of the transformer. In practice, the constant K is about 1.25 for shell-type power transformers, about 0.6 for core-type power transformers, and about 0.4 for core-type distribution transformers.

Some Studies of Pulse Transformer Equivalent Circuits

A pulse transformer equivalent circuit is synthesized from data obtained by direct test on a typical pulse transformer. The differential equations for the equivalent circuit are solved by means of a mechanical differential analyzer for a variety of circuit constant values. Wave forms of transformer output voltage as obtained from the differential analyzer are of assistance in the design of pulse transformers.