A novel integrated magnetic structure suitable for transformer-linked interleaved boost chopper circuit (original) (raw)
Related papers
IEEJ Journal of Industry Applications, 2014
A novel integrated magnetic structure suitable for a transformer-linked interleaved boost chopper circuit is proposed in this paper. Coupled inductors with high coupling are known to be effective for downsizing magnetic components. However, it is difficult to obtain the optional leakage inductance with high coupling for coupled inductors with EE or EI cores because of the fringing effect in the air gap. In order to overcome this problem, a novel integrated magnetic structure is first proposed. Then, a design method for the coupled inductor with the proposed magnetic structure is introduced on the basis of the magnetic circuit model. Finally, the effectiveness of the novel magnetic core structure is validated and discussed from an experimental viewpoint.
Some design considerations for coupled inductors for integrated buck-boost converters
Power Engineering, Energy …, 2011
This paper presents some design considerations for magnetically coupled inductors in buck-boost converters for distributed power generation. As compared to the conventional approach, the proposed integrated magnetic structure with coupled inductors enables reduction in core loss, core size, winding losses and in the number of turns. This paper discusses rough and simple design of the coupled inductor to achieve desired objectives. The methodology for the selection of inductance, core geometry, number of turns, air gap and isolation is described. In addition, general operation principles and conditions for the continuous conduction mode (CCM) and the discontinuous conduction mode (DCM) are presented. In order to verify the theoretical assumptions a prototype has been built. The experimental results are presented and discussed.
Design of coupled inductor for interleaved boost converter
This paper presents an analysis of coupled inductor for interleaved boost converter and the effect of coupled inductor on current ripple reduction and on load transient response time. From the analysis a ETD core based coupled inductor structure is proposed to maximize the performance of the DC-DC converter. The inductor can be designed in convenient way by using commercially manufactured coil formers and ferrite cores. Streszczenie. W artykule zaprezentowano analizę sprzężonego dławika stosowanego w przekształtniku typu boost w celu tłumienia tętnień i poprawy stanów przejściowych. Zaproponowano strukturę typu ETD. Projekt sprzężonego dławika w zastosowaniu do przekształtnika typu boost.
Design of a four-phase interleaved boost circuit with closed-coupled inductors
In this paper, a novel magnetic structure suitable for boost converters is proposed. Multi-phase interleaved method using coupled-inductor has gained attention in electric powertrains for electric, hybrid and fuel cell vehicles in order to achieve high power density. In fact, a four-phase boost converter using coupled inductor is used in the drive system of the Honda CLARITY. In particular, magnetic coupling method is used in coupled inductors, Loosely-Coupled Inductors (LCI) and Closed-Coupled Inductors (CCI). This study is focused on these methods, especially using the CCI. This paper presents a design method of a closed-coupled inductors using generic cores for a four-phase interleaved boost converter. In addition a comparison between the proposed topology with other conventional non-coupled methods is carried out. Furthermore, the evaluation of miniaturization is studied. As a result, the proposed method can achieve a huge reduction in the core volume and mass.
Coupled-inductor High Step-up Integrated Topologies: Synthesis, Analysis And Experimental Results
Eletrônica de Potência, 2016
This paper presents a new integration concept to generate high voltage step-up non-isolated DC/DC converters with the aid of coupled-inductors. The integration concept relies on the separation of the converter circuit into two or three parts named input, middle and output sections. Hence, any basic converter can partially or fully share one of its sections with another basic converter since both circuits comply with the integration rules. The merged converters become an integrated topology with fewer components. According to this paper, for the input section parallel integration, the circuits remaining output sections can be associated in three different ways, in a series, parallel or cascaded connection. These output sections associations allow for a merged topology to enhance their voltage gain that becomes the sum of the voltage gains of the former topologies alone. An example of integration of the boost and flyback converter is provided to illustrate the theory. The resulting integrated topologies are theoretically and experimentally evaluated. The results prove that the integration methodology is an effective way to obtain high voltage conversion ratio circuits and that the derived topologies are highly efficient due to their low converter series resistances.
New integrated planar magnetic cores for inductors and transformers fabricated in MCM-L technology
International Journal of …, 2000
This paper discusses the integration of magnetic components (inductors and transformers) into MCM-L technology. Initially, a brief review of integrated magnetic components in general is presented. The paper then progresses to discuss a new method for producing planar magnetic core structures around integrated winding layers in PCB technology. For open core structures, electroplated permalloy (NiFe) layers are used to form magnetic plates above and below internal layers of copper spiral turns. Closed cores are formed around the windings by interconnecting top and bottom magnetic plates by plated through-holes of NiFe. Issues relating to the fabrication of the core regions are described in detail. A significant advantage of the method is that the processes involved are similar to those used for defining copper tracks and plated through-holes in standard PCB technology. Initial inductor and transformer prototypes have been produced with inductance values of up to 100 µH in a 1 cm 2 footprint.
PCB integrated inductors for low power DC/DC converter
IEEE Transactions on Power Electronics, 2003
This paper discusses the use of printed circuit board (PCB) integrated inductors for low power dc/dc buck converters. Coreless, magnetic plates and closed core structures are compared in terms of achievable inductance, power handling and efficiency in a footprint of 10 10 mm 2. The magnetic layers consist of electroplated NiFe, so that the process is fully compatible with standard PCB process. Analytic and finite element method (FEM) methods are applied to predict inductor performance for typical current waveforms encountered in a buck converter. Conventional magnetic design procedures are applied to define optimum winding and core structures for typical inductor specifications. A 4.7 H PCB integrated inductor with dc current handling of up to 500 mA is presented. This inductor is employed in a 1.5 W buck converter using a commercial control integrated circuit (IC). The footprint of the entire converter measures 10 10 mm 2 and is built on top of the integrated inductor to demonstrate the concept of integrated passives in power electronic circuits to achieve ultra flat and compact converter solutions.
Performances of interleaved and Face to Face integrated magnetic transformers
EPJ Web of Conferences, 2013
Currently, most of integrated transformers are fabricated without magnetic core. In order to reduce the size and to improve their performances, we were interested in the study of integrated transformers based of thin ferrite films. Interleaved and Face to Face structures were simulated using the Ansoft HFSS simulator over a wide range of frequency (up to 100MHz). A high frequency electrical model has been defined to determine the main characteristics of the transformer and particularly the interwinding capacitance and coupling factor between primary and secondary windings. The simulation results allowed us to determine the geometrical dimensions of these structures in order to optimize the magnetic coupling coefficient and to minimize inter winding capacitance.
A HIGH EFFICIENT BOOST CHOPPER COUPLED WITH AN INTERLEAVED INDUCTOR FOR HYBRID ELECTRICAL VEHICLES
ijetrm journal , 2021
The proposed work illustrates an improved efficiency of a dc-dc boost chopper with a clamp network. The coupledinductor boost choppers are interleaved in this system. A d boost chopper is used to clamp the voltage stresses of all the switches in the interleaved choppers, caused by the leakage inductances present in the practical coupled inductors, to a low voltage level. The High efficiency is achieved by recycling of leaked energies, voltage stress of the switches are reduced mitigation of the output diode is reverse recovery problem, and interleaving of the choppers. The leakage energy of the inter-leaved dc-dc choppers are fed to a clamp capacitor and recycled to the output by the clamp boost chopper. In many applications, high-efficiency, high-voltage step-up dc-dc choppers are required as an interface between the available low voltage sources and the output loads, which are operated at much higher voltages. The proposed work is carried out for as such application in Electric Vehicles(EV). Different distributed energy storage components such as batteries, fuel cells, and ultra capacitors are used in the power trains of hybrid electric vehicles (HEV), electric vehicles (EV), and fuel cell vehicles (FCV).The proposed chopper topology can be used in this applications.