Evaluation of thermal performance of automotive inverter with laminar busbars

"This publication was realized with support of Operational Program Integrated Infrastructure 2014 - 2020 of the project: Innovative Solutions for Propulsion, Power and Safety Components of Transport Vehicles, code ITMS 313011V334, co-financed by the European Regional Development FundThe paper deals with traction inverters used in the field of electromobility, while the focus of the study is, investigation of the thermal performance, when laminar busbars are used. Initially the specifications on the circuit configuration are being discussed. It is then followed by the component selection, while considering main circuit components, the DC link capacitor and power transistor modules represent essential parts for inverter design. Investigation of thermal performance is realized for semiconductor module, and busbars. For this purpose, the simulation model was developed, which contains all required definitions for investigation. With the use of simulation model, it is possible to study the influence of various circuit components, busbar geometry and the ways how they influence the thermal performance of the converter because of electric current flow

Analysis of Wireless Power System Efficiency in Dependency on Configuration of Resonant Tank

This chapter compares various compensation methods for resonant coupling of the wireless energy transfer system. A proposed analysis is particularly relevant to any application where contactless battery charging is used. Main parameters that are investigated include efficiency and electrical variables (current and voltage) of the circuit. In order to analyze the most suitable solution of coupling compensation, the relevant equations are graphically interpreted for each discussed circuit topology. Finally, this chapter provides the recommendations how to design the wireless power-transfer system with the highest possible efficiency for the given system parameters (switching frequency and transmitting distance)

Analysis of two section resonant voltage converter for matrix led light source drivers

Analysis of two-section resonant DC-to-DC converter with phase power control, which is the basis of the matrix LED light source driver is carried out. Two-section converter is considered as a boundary case of the multi-section converter with one controlled section and other uncontrolled sections. Analysis is carried out by the fundamental harmonic approximation method. Analytical expressions for complex voltages and currents in the converter sections are determined, its control characteristic is obtained. It is shown that the converter power can be controlled within the range from the maximum value to zero. The problems of operation of section transistor switches in their zero-voltage switching mode is considered. The verification of the proposed analysis by means of converter simulation is carried out. The simulation results are in good agreement with the analysis results

Theoretical and Practical Design Approach of Wireless Power Systems

The paper introduces the main issues concerned with the conceptual design process of wireless power systems. It analyses the electromagnetic design of the inductive magnetic coupler and proposes the key formulas to optimize its electrical parameters for a particular load. For this purpose, a very detailed analysis is given focusing on the mathematical concept procedure for determination of the key factors influencing proper coupling coils design. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of leakage magnetic field

The Study of the Operational Characteristic of Interleaved Boost Converter with Modified Coupled Inductor

In this article, design, analysis, and experimental testing of a dual interleaved boost converter with coupled inductor including demagnetizing winding are presented. Proposed topology uses the specific design of boost coils placed within the side parts of the EE core together with a demagnetizing coil located on the center part of the core. Paper describes principles of operational scenarios and characteristics. Through modification of turns ratio between boost coils and demagnetizing coil is possible to achieve high voltage gain. Consequently, the functional performance of this perspective topology is realized experimentally. For that purpose, the physical sample of converter is designed and tested in terms of efficiency considering the change of transferred power or the change of input voltage. Through modification of turns ratio between boost coils and demagnetizing coil is possible to achieve high voltage gain, therefore these dependencies are also evaluated considering also the change of the duty cycle. At the end of the paper basic operational properties are compared to standard boost topologies. It was discovered that even due to higher complexity of the proposed converter oppose to selected topologies, the operational performance is much better considering ripple of the electrical variables, efficiency, or the size of circuit components

Advanced Perspectives for Modeling Simulation and Control of Power Electronic Systems

Power electronic systems have become a major issue related to advancements in consumer and industrial electronics [...

Evaluation of thermal performance of automotive inverter with laminar busbars

"This publication was realized with support of Operational Program Integrated Infrastructure 2014 - 2020 of the project: Innovative Solutions for Propulsion, Power and Safety Components of Transport Vehicles, code ITMS 313011V334, co-financed by the European Regional Development FundThe paper deals with traction inverters used in the field of electromobility, while the focus of the study is, investigation of the thermal performance, when laminar busbars are used. Initially the specifications on the circuit configuration are being discussed. It is then followed by the component selection, while considering main circuit components, the DC link capacitor and power transistor modules represent essential parts for inverter design. Investigation of thermal performance is realized for semiconductor module, and busbars. For this purpose, the simulation model was developed, which contains all required definitions for investigation. With the use of simulation model, it is possible to study the influence of various circuit components, busbar geometry and the ways how they influence the thermal performance of the converter because of electric current flow

Evaluation of the Perspective Power Transistor Structures on Efficiency Performance of PFC Circuit

The aim of this work is to investigate the influence of circuit elements on the properties of the selected power factor correction (PFC) topology. Active or passive PFC serves to increase the power factor (PF) and reduce the total harmonic distortion (THD) of the mains current. As a result, the distribution network is lightened due to its interference caused by connected electronic devices. An important indicator of all electronic converters is efficiency. Therefore, the work deals with the analysis of possible efficiency improvements in conjunction with the use of technologically new active components. Detailed experimental analyses and optimization procedures are performed in terms of the influence of transistor structures (SiC and GaN) on the qualitative indicators of the proposed PFC converter for a wide operating spectrum. The synthesis of the obtained results is given, together with recommendations for optimal selection and optimal design of PFC main circuit elements with regard to achieving peak efficiency values

Modeling and Experimental Verification of Induction Heating of Thin Molybdenum Sheets

This paper deals with the issues relevant for precise finite element method (FEM) modeling of thin molybdenum plates’ induction heating. The proposed methodology describes the step-by-step Multiphysics (electro-thermal) design approach, verified by the experimental measurements. Initially, it was observed that the relative error between model and experimental set-up is within the 1.2% up to 2.5% depending on the location of the measuring points. Further research was focused on the enhancement of the simulation model in the form of its parametrization. It means that it is easy to define the induction coil’s operational parameters and geometrical properties (ferrite shape, operating frequency, the distance between plate and heating element, the value of coil current, etc.). The target of this approach is to be able to determine the optimal operational settings targeting the required heating performance of thin molybdenum plates. One of the main requirements regarding the optimal heating process is temperature distribution within the molybdenum plate’s surface. The proposed model makes it possible to obtain information on optimal operational conditions based on the received results

Evaluation of the Accuracy of the Identified Equivalent Electrical Circuit of LiPePO₄ Battery through Verified Measurements

In this paper, the system procedure for the identification of the equivalent electrical circuit diagram of electrochemical cells is being given. Due to the fact that energy storage systems (ESS) penetrate within many applications, the availability of their accurate and simple simulation models for time–domain analysis is very desirable. This paper describes the configuration of the laboratory measuring systems required for data acquisition, curation, and analysis of received measured data required for development of equivalent electrical circuit models (EECM) of electrochemical cells. Nowadays, various types of electrochemical cells are available for packaging technology. Therefore, the evaluation of presented identification methodology is validated through measurements of two different types of LiFePO4 cells. The first cell type is prismatic labeled LFP040AHA, and the second type is NPB 60 AH of the same manufacturer. The main aim of this paper is the determination of the elements of equivalent electrical circuit schematics of selected electrochemical cells. Consequently, the development of a simulation model is described, together with the evaluation of its accuracy through comparisons with experimental measurements. From achieved results, the relative error of simulation model varies at 2%, and thus the presented methodology is suitable for identification of EECM, and consequent design of accurate and fast computing simulation models of ESS systems