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Article
Publication date: 28 March 2024

Ignacio Jesús Álvarez Gariburo, Hector Sarnago and Oscar Lucia

Induction heating processes need to adapt to complex geometries or variable processes that require a high degree of flexibility in the induction heating setup. This is usually…

Abstract

Purpose

Induction heating processes need to adapt to complex geometries or variable processes that require a high degree of flexibility in the induction heating setup. This is usually done using complex inductors or adaptable resonant tanks, which leads to costly and constrained implementations. This paper aims to propose a multi-level, versatile power supply able to adapt the output to the required induction heating process.

Design/methodology/approach

This paper proposes a versatile multilevel topology able to generate versatile output waveforms. The methodology followed includes simulation of the proposed architecture, design of the power electronics, control and magnetic elements and laboratory tests after building a 10-level prototype.

Findings

The proposed converter has been designed and tested using an experimental prototype. The designed generator is able to operate at 1 kVpp and 100 A at 250 kHz, proving the feasibility of the proposed approach.

Originality/value

The proposed converter enables versatile waveform generation, enabling advanced tests and processes on induction heating system. The proposed system allows for multifrequency generation using a single inductor and converter, or advanced tests for inductive and capacitive components used on induction heating systems. Unlike previous multifrequency proposals, the proposed generator enables a significantly improved versatility in terms of operational frequency and amplitude in a single converter.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 6 March 2017

Alejandro Naval, Hector Sarnago, Ignacio Lope, Oscar Lucia and José M. Burdio

Litz wire manufacturing using mechanical procedures presents several limitations regarding reliability and repeatability, especially when a small strand diameter is used. This…

Abstract

Purpose

Litz wire manufacturing using mechanical procedures presents several limitations regarding reliability and repeatability, especially when a small strand diameter is used. This paper aims to propose a power supply design for Litz wire manufacturing using a high-frequency high-performance resonant converter.

Design/methodology/approach

This paper proposes the design of a resonant power supply for induction heating specially designed to tackle with the challenge of heating Litz wires quickly.

Findings

The proposed converter enables the removal of the isolating coating from the Litz wire through induction heating, improving significantly the manufacturing process.

Originality/value

The proposed converter improves significantly the manufacturing process of Litz wire through induction heating, with economic and reliability benefits.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 36 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 7 February 2024

Borja López-Alonso, Pablo Briz, Hector Sarnago, José M. Burdio and Oscar Lucia

This paper aims to study the feasibility of proposed method to focus the electroporation ablation by mean of multi-output multi-electrode system.

26

Abstract

Purpose

This paper aims to study the feasibility of proposed method to focus the electroporation ablation by mean of multi-output multi-electrode system.

Design/methodology/approach

The proposed method has been developed based on a previously designed electroporation system, which has the capabilities to modify the electric field distribution in real time, and to estimate the impedance distribution. Taking into consideration the features of the system and biological tissues, the problem has been addressed in three phases: modeling, control system design and simulation testing. In the first phase, a finite element analysis model has been proposed to reproduce the electric field distribution within the hepatic tissue, based on the characteristics of the electroporation system. Then, a control strategy has been proposed with the goal of ensuring complete ablation while minimizing the affected volume of healthy tissue. Finally, to check the feasibility of the proposal, several representative cases have been simulated, and the results have been compared with those obtained by a traditional system.

Findings

The proposed method achieves the proposed goal, as part of a complex electroporation system designed to improve the targeting, effectiveness and control of electroporation treatments and serve to demonstrate the feasibility of developing new electroporation systems capable of adapting to changes in the preplanning of the treatment in real-time.

Originality/value

The work presents a thorough study of control method to multi-output multi-electrode electroporation system by mean of a rigorous numerical simulation.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 6 March 2017

Oscar Lucia, Hector Sarnago and José M. Burdio

Wide-bandgap (WBG) semiconductors have emerged as a disruptive technology in the power electronics sphere. This paper aims to analyse and discuss the importance for induction…

Abstract

Purpose

Wide-bandgap (WBG) semiconductors have emerged as a disruptive technology in the power electronics sphere. This paper aims to analyse and discuss the importance for induction heating systems and gives some examples and highlights some future design trends and perspectives.

Design/methodology/approach

The benefits of WBG semiconductors are reviewed with a special emphasis on induction heating applications.

Findings

WBG devices enable the design of higher-performance induction heating power supplies. A significant selection of the reported converters is discussed, highlighting the benefits of this technology.

Originality/value

This paper highlights the benefits of WBG semiconductors and their potential to change and improve induction heating technology in the next years.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 36 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 13 September 2011

Claudio Carretero, Óscar Lucía, Jesús Acero, Rafael Alonso and José M. Burdío

The aim of this paper is to propose a design procedure based on the impedance boundary condition in order to simplify the design of inductors for domestic induction heating…

Abstract

Purpose

The aim of this paper is to propose a design procedure based on the impedance boundary condition in order to simplify the design of inductors for domestic induction heating systems.

Design/methodology/approach

An electromagnetic description of the inductor system is performed to substitute the effects of a component, named system load, for a mathematical condition, the so‐called impedance boundary condition. This is suitable to be used in electromagnetic systems involving high conductive materials at medium frequencies, as it occurs in an induction heating system. Applying this approach, a simplified electrical model arises from the general system.

Findings

A considerable reduction in the efforts devoted to design a coil for induction heating purposes is achieved, because the solution considering the variation of three physical parameters are projected to a one‐dimensional space only depending on a single parameter named corrected penetration depth. This proposal assesses the working conditions of standard induction systems.

Practical implications

This work is performed to achieve a better understanding of the fundamentals involved in the electromagnetic modeling of an induction heating system. The main goal is the definition of a better coil design process because it is probably the most time‐consuming task in the construction of a complete induction system.

Originality/value

In this paper, the so‐called corrected penetration depth is defined. This single parameter allows explaining the influence of the physical parameter of the inductor load and the excitation frequency in the equivalent of the complete inductor system. The numerical results carried out considering the corrected penetration depth instead of the physical load properties have been validated experimentally.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 30 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

Book part
Publication date: 7 December 2009

Mary Salvaterra, Jane Wakahiu, Jane Farr and Gina Zaffino

African women religious have inherited both the cultural and historical concepts of leadership. To understand what motivates them in their service to the poor and to appreciate…

Abstract

African women religious have inherited both the cultural and historical concepts of leadership. To understand what motivates them in their service to the poor and to appreciate their need for leadership skills as opposed to proficiency in specific areas of service (nursing, teaching, and counseling), the authors provide a backdrop in the historical and cultural development of African nations.

Details

Educational Leadership: Global Contexts and International Comparisons
Type: Book
ISBN: 978-1-84950-645-8

Expert briefing
Publication date: 15 December 2017

Election preparations.

Details

DOI: 10.1108/OXAN-DB227503

ISSN: 2633-304X

Keywords

Geographic
Topical
Article
Publication date: 12 April 2011

Oscar Ricci

Celebrity‐spotters actively pursue celebrities in order to take photographs of them. This often involves extensive travelling, sometimes to remote destinations. The purpose of…

720

Abstract

Purpose

Celebrity‐spotters actively pursue celebrities in order to take photographs of them. This often involves extensive travelling, sometimes to remote destinations. The purpose of this paper is to analyse this new type of tourism.

Design/methodology/approach

In order to understand this new type of tourism, the authors used a textual analysis of Italian celebrity‐spotting web sites and 31 in‐depth interviews with celebrity‐spotters.

Findings

The main characteristics of the celebrity‐spotters can be outlined: they practise a sort of “precision tourism”, characterised by close attention to the news in order to know where to go, flexibility for changing locations at the last moment, and a natural predisposition for new technologies. Celebrity‐spotting is not just an observational tourism, but rather a performing one; they must take photographs, gain access to the right places and ambush their targets.

Practical implications

Knowing the characteristics of celebrity‐spotters can help to better understand this new type of tourism, which has yet to be exploited by the tourism industry.

Originality/value

The paper presents an in‐depth analysis of a rather unknown and unexplored type of tourist.

Details

Worldwide Hospitality and Tourism Themes, vol. 3 no. 2
Type: Research Article
ISSN: 1755-4217

Keywords

Content available
Book part
Publication date: 20 October 2011

Abstract

Details

Entrepreneurship in the Global Firm
Type: Book
ISBN: 978-1-78052-115-2

Content available
Book part
Publication date: 19 December 2017

Karin Klenke

Abstract

Details

Women in Leadership 2nd Edition
Type: Book
ISBN: 978-1-78743-064-8

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