Using LLC Resonant Converter for Designing Electric Vehicle DC/DC Converter

2014 ◽  
Vol 1070-1072 ◽  
pp. 1614-1620
Author(s):  
Tong Li Wu ◽  
Ke Hong Wang ◽  
Jia Jia Yang
Keyword(s):  
Magnetic Structure ◽  
Electric Vehicle ◽  
Power Density ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Theoretical Derivation ◽  
Loss Distribution ◽  
Loss Analysis ◽  
Llc Resonant Converter

A design of 100 kHz-1350 W electric vehicle DC/DC converter using LLC resonant converter with integrated transformer is presented. The loss analysis based on theoretical derivation is performed to reveal the loss distribution. Integrated magnetic structure is adopted in the design to further increase the efficiency and power density. A 280 V-360 V input, 13.5 V/100 A output prototype is built to verify its advantage, and the efficiency at 320 V input, 13.5 V/100 A output is 91.5% at the switching frequency of 100 kHz.

scholarly journals High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

2021 ◽  
Vol 11 (23) ◽  
pp. 11350
Author(s):  
Seyed Abolfazl Mortazavizadeh ◽  
Simone Palazzo ◽  
Arturo Amendola ◽  
Enzo De Santis ◽  
Dario Di Ruzza ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Frequency ◽  
High Efficiency ◽  
Resonant Converters ◽  
Switching Frequency ◽  
High Power Density ◽  
Resonant Converter ◽  
Gan Hemt ◽  
Llc Resonant Converter

Soft switching for both primary and secondary side devices is available by using LLC converters. This resonant converter is an ideal candidate for today’s high frequency, high efficiency, and high power density applications like adapters, Uninterrupted Power Supplies (UPS), Solid State Transformers (SST), electric vehicle battery chargers, renewable energy systems, servers, and telecom systems. Using Gallium-Nitride (GaN)-based power switches in this converter merits more and more switching frequency, power density, and efficiency. Therefore, the present paper focused on GaN-based LLC resonant converters. The converter structure, operation regions, design steps, and drive system are described precisely. Then its losses are discussed, and the magnets and inductance characteristics are investigated. After that, various interleaved topologies, as a solution to improve power density and decrease current ripples, have been discussed. Also, some challenges and concerns related to GaN-based LLC converters have been reviewed. Commercially available power transistors based on various technologies, i.e., GaN HEMT, Silicon (Si) MOSFET, and Silicon Carbide (SiC) have been compared. Finally, the LLC resonant converter has been simulated by taking advantage of LTspice and GaN HEMT merits, as compared with Si MOSFETs.

Design of Magnetic Integrated Transformer for LLC Resonant Converter

2014 ◽  
Vol 1070-1072 ◽  
pp. 1621-1624
Author(s):  
Tong Li Wu ◽  
Ke Hong Wang ◽  
Jia Jia Yang
Keyword(s):  
Electric Vehicle ◽  
Design Process ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Test Results ◽  
Magnetic Components ◽  
Series Resonant ◽  
Design Values ◽  
Llc Resonant Converter ◽  
Resonant Inductor

There are altogether three magnetic components in the resonant tank of LLC resonant converter: the series resonant inductor, the parallel inductor and the transformer. The method to realize the magnetic integrated transformer in LLC resonant converter is presented. The design process is provided, and a magnetic integrated transformer is constructed and the test results correspond well with the design values. A prototype of 1350 W, 100 kHz LLC resonant converter type electric vehicle DC/DC converter equipped with the magnetic integrated transformer is built to verify the performance of the magnetic integrated transformer, and the efficiency at 320 V input, 13.5 V/100 A output is 91.5% at the switching frequency of 100 kHz.

scholarly journals Analysis and Pareto Frontier Based Tradeoff Design of an Integrated Magnetic Structure for a CLLC Resonant Converter

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1756
Author(s):  
Gang Wang ◽  
Qiyu Hu ◽  
Chunyu Xu ◽  
Bin Zhao ◽  
Xiaobao Su
Keyword(s):  
Magnetic Structure ◽  
Power Density ◽  
High Efficiency ◽  
Pareto Frontier ◽  
Optimization Procedure ◽  
Magnetic Core ◽  
Pareto Optimization ◽  
High Power Density ◽  
Resonant Converter ◽  
Conduction Loss

This paper proposes an integrated magnetic structure for a CLLC resonant converter. With the proposed integrated magnetic structure, two resonant inductances and the transformer are integrated into one magnetic core, which improves the power density of the CLLC resonant converter. In the proposed integrated magnetic structure, two resonant inductances are decoupled with the transformer and can be adjusted by the number of turns in each inductance. Furthermore, two resonant inductances are coupled to reduce the number of turns in each inductance. As a result, the conduction loss can be reduced. The trade-off design of the integrated magnetic structure is carried out based on the Pareto optimization procedure. With the Pareto optimization procedure, both high efficiency and high-power density can be achieved. The proposed integrated magnetic structure is validated by theoretical analysis, simulations, and experiments.

Univesal Design of LLC Resonant Converter with Fixed Switching Frequency

2020 ◽  
Author(s):  
Jiangtao Xu ◽  
Yun Wei ◽  
Xin Cheng ◽  
Hua Yang ◽  
Hongxiang Xue ◽  
...  
Keyword(s):  
Switching Frequency ◽  
Resonant Converter ◽  
Llc Resonant Converter

An 8kW LLC resonant converter in plasma power supply based on SiC power devices for efficiency improvement

Circuit World ◽  
2019 ◽  
Vol 45 (4) ◽  
pp. 181-188
Author(s):  
Zhenmin Wang ◽  
Wenyan Fan ◽  
Fangxiang Xie ◽  
Chunxian Ye
Keyword(s):  
Silicon Carbide ◽  
Power Supply ◽  
High Frequency ◽  
Experimental Results ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Plasma Power ◽  
Power Devices ◽  
Content Type ◽  
Llc Resonant Converter

Purpose This paper aims to present an 8 kW LLC resonant converter designed for plasma power supply with higher efficiency and lighter structure. It presents how to solve the problems of large volume and weight, low performance and low efficiency of traditional plasma power supply. Design/methodology/approach At present, conventional silicon (Si) power devices’ switching performance is close to the theoretical limit determined by its material properties; the next-generation silicon carbide (SiC) power devices with outstanding advantages can be used to optimal design. This 8 kW LLC resonant converter prototype with silicon carbide (SiC) power devices with a modulated switching frequency ranges from 100  to 400 kHz. Findings The experimental results show that the topology, switching loss, rectifier loss, transformer loss and drive circuit of the full-bridge LLC silicon carbide (SiC) plasma power supply can be optimized. Research limitations/implications Due to the selected research object (plasma power supply), this study may have limited universality. The authors encourage the study of high frequency resonant converters for other applications such as argon arc welding. Practical implications This study provides a practical application for users to improve the quality of plasma welding. Originality/value The experimental results show that the full-bridge LLC silicon carbide (SiC) plasma power supply is preferred in operation under conditions of high frequency and high voltage. And its efficiency can reach 98%, making it lighter, more compact and more efficient than previous designs.

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