Explore the vast range of titles available.

Based on the fundamentals of electromagnetics, this clear and concise text explains basic and applied principles of transformer and inductor design for power electronic applications. It details both the theory and practice of inductors and transformers employed to filter currents, store electromagnetic energy, provide physical isolation between circuits, and perform stepping up and down of DC and AC voltages. The authors present a broad range of applications from modern power conversion systems. They provide rigorous design guidelines based on a robust methodology for inductor and transformer design.  They offer real design examples, informed by proven and working field examples. Key features include:  * emphasis on high frequency design, including optimisation of the winding layout and treatment of non-sinusoidal waveforms * a chapter on planar magnetic with analytical models and descriptions of the processing technologies * analysis of the role of variable inductors, and their applications for power factor correction and solar power * unique coverage on the measurements of inductance and transformer capacitance, as well as tests for core losses at high frequency * worked examples in MATLAB, end-of-chapter problems, and an accompanying website containing solutions, a full set of instructors' presentations, and copies of all the figures. Covering the basics of the magnetic components of power electronic converters, this book is a comprehensive reference for students and professional engineers dealing with specialised inductor and transformer design. It is especially useful for senior undergraduate and graduate students in electrical engineering and electrical energy systems, and engineers working with power supplies and energy conversion systems who want to update their knowledge on a field that has progressed considerably in recent years.

Emergent electromagnetic induction based on electrodynamics of noncollinear spin states may enable dramatic miniaturization of inductor elements widely used in electric circuits, yet the research is still in its infancy and many issues must be resolved toward its application. One such problem is how to increase working temperature to room temperature, and possible thermal agitation effects on the quantum process of the emergent induction are unknown. We report here large emergent electromagnetic induction achieved around and above room temperature, making use of a few tens of micrometer-sized devices based on the high-temperature (up to 330 K) and short-period (≤ 3 nm) spin-spiral states of a metallic helimagnet. The observed inductance value L and its sign are observed to vary to a large extent, depending not only on the spin-helix structure controlled by temperature and applied magnetic field but also on the applied current density. The present finding on room-temperature operation and possible sign control of L may provide a step toward realizing microscale quantum inductors on the basis of emergent electromagnetism in spin-helix states.

Herein, we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inverter. The proposed circuit topology, control strategy, and related analysis are presented. The circuit topology of the inverter comprises a quasi-Z-source network with an integrated magnetic inductor, an active clamp circuit, a three-phase inverter bridge, and an output LC filter, all of which are connected in series. An improved 12-sector space vector modulation scheme is proposed based on the root-mean-square value of the voltage and the instantaneous value of the current. Furthermore, analyses of the inverter voltage transmission ratio, resonant process, and parametric design guidelines for integrated magnetic inductor and zero-voltage switching conditions are presented. Experimental results on a 1-kVA prototype inverter demonstrate that the proposed inverter exhibits a higher transmission ratio and efficiency than existing inverters; thus, the proposed inverter would have broad prospects in low-voltage DC-AC applications.

To ensure airport navigation lights can obtain high-quality backup stable AC power, we designed the dual-loop control single-phase full-bridge inverter for its backup power cabin. The design adopts bipolar modulation, with the current loop as the inner loop and the voltage loop as the outer loop, taking the output voltage and inductor current as two feedback signals to achieve dual-loop control, which is used to automatically adjust the current and voltage. This paper uses an output filter to eliminate harmonic components at the switching frequency and sidebands, and it designs the control circuit and driving circuit to ensure the efficiency of the electrical energy output.

This paper proposed an improved equalization circuit based on a bidirectional CUK converter. Compared with traditional bus equalization circuits based on CUK converter, it owns a simpler structure with fewer inductors, resulting in a smaller volume and higher energy density of the proposed equalization circuit. The operation principle and steady-state characteristic of the equalizer are analysed. The equalizer is applied to the energy balance of the series-connected battery strings, and the balance principle is designed. The proposed equalization system achieves a fast energy balance of the battery pack. Simulation results verify the effectiveness of the designed equalization circuit and balance strategy.

The most familiar magnets are permanent magnets like the ones on a refrigerator door. However, for applications in transformers and motors, soft magnets that can rapidly switch their magnetization in response to a magnetic field are used. In electronics, wide bandgap semiconductors such as silicon carbide will allow power conversion electronics and motor controllers to operate more efficiently, but soft magnets must be developed that can respond at higher frequencies. Silveyra et al. review the development of current soft magnetic materials and opportunities for improving their performance in high-frequency operation. Materials being explored include soft ferrites, amorphous and nanocrystalline alloys, and powder cores or soft magnetic composites. Science , this issue p. eaao0195 Soft magnetic materials are key to the efficient operation of the next generation of power electronics and electrical machines (motors and generators). Many new materials have been introduced since Michael Faraday’s discovery of magnetic induction, when iron was the only option. However, as wide bandgap semiconductor devices become more common in both power electronics and motor controllers, there is an urgent need to further improve soft magnetic materials. These improvements will be necessary to realize the full potential in efficiency, size, weight, and power of high-frequency power electronics and high–rotational speed electrical machines. Here we provide an introduction to the field of soft magnetic materials and their implementation in power electronics and electrical machines. Additionally, we review the most promising choices available today and describe emerging approaches to create even better soft magnetic materials.

The commonly used methods for parameter design of Capacitor-Inductor-Inductor-Capacitor (CLLC) converters include the harmonic approximation method and the time-domain analysis method. The harmonic approximation method only retains the first harmonic component, resulting in inaccurate gain over a wide frequency range. While the time-domain analysis method is applicable to a wide frequency range but has high computational complexity, moreover, neither considers the relationship between output gain and turn-off loss. However, existing design methods for turn-off loss in LLC resonant converters can’t be directly applied to CLLC resonant converters due to the differences in their topology. To address the aforementioned issues, this paper proposes a novel approach to optimize the design parameters of CLLC resonant converters and reduce turn-off loss. Firstly, the gain on the excitation inductance is obtained based on the output gain of the CLLC resonant converter, and then the expressions for the excitation current Im and the turn-off loss Poff with respect to (k, Q, fn) are obtained. Finally, a 5000W experimental prototype was built and its peak efficiency was verified to reach 95.48%.

Tests have shown that the inductance value of an inductive element under unsaturated conditions is subject to different disturbance effects when subjected to a constant external magnetic field of varying intensity and position, leading to fluctuations in the induced voltage. Based on test data, a model was proposed and established to describe the disturbance on the inductance L caused by the intensity of the interfering magnetic field B and the distance s of the interfering source. Multivariate nonlinear regression analysis was employed, with cross-validation techniques combined with grid search methods used to determine the optimal parameters of the non-linear model. Considering practical engineering implementation, a model for an inductive element with an additional voltage source was proposed, providing a circuit model for inductively loaded measuring instruments such as transformers and mutual inductors.

In the wide voltage rang application, due to the natural advantages of zero-voltage-switching (ZVS) for primary MOSFETs, zero-current-switching (ZCS) for secondary diodes, high efficiency, simple structure and control of the inductor–inductor–capacitor (LLC) resonant converters, it has attracted much attention. However, the traditional LLC design method faces many challenges in the wide voltage range application. In this paper, high-quality-factor Q (high Q-LLC) design method for traditional LLC is proposed to solve the problem that the traditional LLC with pulse-frequency-modulation (PFM) controlled is not applicable for the wide gain application. Increasing quality factor Q can make the normalized gain profile of the LLC with PFM much steeper in the interval greater than the resonance frequency. Therefore, the traditional LLC without added any components can achieve wide voltage Gain. ZVS of the all primary MOSFETs can achieved over the full output voltage range and load conditions. Finally, a prototype with 100∼900V output of 1kW has been designed to feasibility of the proposed high Q-LLC design method. The maximum efficiency of prototype is 97.7% and features excellent voltage regulation capability. Thus, the proposed high Q-LLC design method is applied to the wide voltage gain applications.

This article analyzes the problem of modeling the properties of such magnetic elements as inductors, coupled inductors, and transformers using the SPICE software (version 17.2). Both the classical models of magnetic elements, built in this software, and the models implemented in the form of subcircuits are described. In particular, attention was paid to the possibility of taking into account the non-linearity of the characteristics of the considered elements and mutual couplings between electrical, magnetic, and thermal quantities. Using the results of thermographic measurements, the need to take into account the differences in temperature values between the individual windings and the core of inductors and transformers was justified. Selected models of the considered elements given in the literature are briefly characterized. The network structures of the electrothermal models of the considered elements elaborated at Gdynia Maritime University are presented. The results of calculations and measurements illustrating the correctness of the described models and their prac-tical usefulness for the elements of different structures are presented and discussed.