Hybrid PS full bridge and LLC half bridge DC-DC converter for low-voltage and high-current output applications

Yu, Mengyuan; Sha, Deshang; Guo, Zhiqiang; Liao, Xiaozhong

doi:10.1109/apec.2014.6803442

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…Therefore, the geometrical constant of each core in the configuration must satisfy (14). After selecting the core, the maximum flux density B m and the number of primary turns can be evaluated by using (15) and (16). 10 4 2B m A c (16) The computation of converter specific parameters such as primary current I prms , secondary current I srms and duty cycle D depends on the topology chosen.…”

Section: A Selection Of Core Sizementioning

confidence: 99%

Modeling and Characterization of Series Connected Hybrid Transformers for Low-Profile Power Converters

2020

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Compact and low profile power converters are the main business of today's power industry. A significant volume of a power converter is occupied by the power transformer. This article proposes a unique solution that would make the power converters low profile. Instead of designing a power converter by using a single bulky transformer, the solution proposed is to split the main bulky transformer into a number of low profile transformers. This not only reduces the total weight and volume of the converter but also the total transformer losses. The use of more than one transformer in series reduces the applied voltage on the transformers, which minimizes the required turns ratio and decreases the stress on the secondary rectifiers and filter elements. Moreover, the decrease in the applied voltage reduces the proportional loss per transformer and makes it possible to design a hybrid transformer by combining Litz wire and traces of a printed circuit board. The reduced copper loss and lower heat dissipation per transformer simplify thermal management. An analytical comparison is made between the utilization of a single transformer or a number of transformers. The procedure of splitting a volume of a single transformer into a number of small transformers has been comprehensively discussed. The idea is investigated both experimentally and in computer simulation for an example application of a phase shifted full bridge dc-dc converter. The converter is characterized up to a load power of 2.2 kW at V in = 400 V dc and V out = 48 V dc .To make the approach more practical, the transformers are modeled using the traditional analytical method. The design of the example application using the split transformer approach reduces the total transformer weight by 45%, compared to the traditional approach with a single transformer. The converter also shows good performance with a maximum efficiency of 96%. INDEX TERMS Series transformers, modeling of transformers, transformer design, isolated converter, medium power converter, low profile converter, ZVS converter, PSFB converter, lightweight converter.

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Section: A Selection Of Core Sizementioning

confidence: 99%

Modeling and Characterization of Series Connected Hybrid Transformers for Low-Profile Power Converters

2020

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“…Besides, since all the switches adopt the silicon carbide (SiC) MOSFETs to accommodate the 800-V input, it is difficult to achieve a cost-friendly design [30]. To further reduce the cost, the HB topology has been employed on the APM as well [15,31]. However, due to its limited gain range restricted by the rigid modulation methods, it is not suitable for the wide gain range applications.…”

Section: Introductionmentioning

confidence: 99%

Design of hybrid SiC/Si based T‐type three‐level LLC$ LLC$ resonant converter with wide‐input range and low conduction loss for automotive auxiliary power module

Yin

et al. 2022

IET Power Electronics

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The auxiliary power module (APM) in the electrical vehicle converts the high voltage of battery pack to the low voltage to supply the electric power for the internal loads, including electric power steering, electric turbo, headed windshield and cooling pumps. The increasing demands on charging time and mileage have made the battery packs with even higher voltage (e.g. 800 V) a promising option. However, it brings a new challenge for the APM, and either the 1.2‐kV silicon carbide (SiC) device or the three‐level (TL) topology are used conventionally. This work proposes a cost‐effective hybrid SiC/Si‐based T‐type TL LLC$ LLC$ resonant converter for the vehicular APM application with a high step‐down ratio. The 1.2‐kV SiC and 650‐V Si devices are used as the main and auxiliary switches, respectively. It fully utilizes the voltage rating of device, and also improves the efficiency compared with conventional TL topology. To improve the gain range and electromagnetic interference performance, a variable frequency and adjustable phase‐shift modulation scheme is adopted. At the same time, the steady‐state time‐domain model is established to elaborate the operation principles, topology features, and boundary conditions for soft‐switching. Furthermore, the precise solutions for switching frequency and phase‐shift angle are figured out. Finally, the effectiveness of model is verified by the simulation as well as the experiment. A 1‐kW prototype for the application in the APM is demonstrated with the input voltage of 640–840 V and a constant output of 48 V/ 21 A.

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“…When the power switch turns OFF, resonance inductance creates oscillations together with the parasitic capacitance. The zero voltage switching (ZVS) of all the power devices, in most of the cases, cannot be obtained for the entire operating conditions by using only the intrinsic leakage inductance (Shirsavar et al, 2013;Yu et al, 2014), as it is often not sufficient. The converter may enter into hard switching at light load.…”

Section: Introductionmentioning

confidence: 99%

Contribution of leakage flux to the total losses in transformers with magnetic shunt

Bakar

Haller

Bertilsson

2020

International Journal of Electronics

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To execute soft switching methods in resonant power converters, transformers with larger leakage inductance are getting more attention. Many papers have constructed various concepts in this regard. However, a discussion about, how the transformer efficiency is affected is lacking in the literature. This paper analyses the effects of the increased leakage inductance on the performance of the transformer. A transformer for increased leakage inductance is modelled and constructed to investigate the losses. The model discusses the effects of increased leakage inductance either by increasing the inter-winding spacing or by integrating the magnetic shunt within the transformer. The investigations show that increasing the leakage inductance by inserting a magnetic shunt can have severe degrading effects on the performance of the transformer, if not designed adequately. Additional losses are also calculated and the effects are verified by the experiments.

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Hybrid PS full bridge and LLC half bridge DC-DC converter for low-voltage and high-current output applications

Cited by 9 publications

References 17 publications

Modeling and Characterization of Series Connected Hybrid Transformers for Low-Profile Power Converters

Modeling and Characterization of Series Connected Hybrid Transformers for Low-Profile Power Converters

Design of hybrid SiC/Si based T‐type three‐level LLC$ LLC$ resonant converter with wide‐input range and low conduction loss for automotive auxiliary power module

Contribution of leakage flux to the total losses in transformers with magnetic shunt

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