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.

scholarly journals Dual Interleaved LLC Converter for High Power Applications and Wide Load Range

2019 ◽  
Vol 25 (3) ◽  
pp. 4-9
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos ◽  
Andrej Kanovsky
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Negative Impact ◽  
Power Converter ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Load Range ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Operational Range

Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

scholarly journals Isolated AC/AC Converter with LLC Resonant Converter High Frequency Link and Four-Quadrant Switches in the Output Stage

2020 ◽  
Author(s):  
Leonardo Freire Pacheco ◽  
Ivo Barbi ◽  
Kaio Cesar Maciel Nascimento
Keyword(s):  
Power Distribution ◽  
High Frequency ◽  
Distribution Systems ◽  
Soft Switching ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Output Stage ◽  
Llc Resonant Converter ◽  
Four Quadrant ◽  
High Frequency Ac

An AC-AC converter with high-frequency link employing LLC resonant converter operating in the vicinity of the resonance frequency is studied, in which the output stage is unique and formed by a high-frequency AC-AC converter employing four quadrant switches. The topology, its operation and the modulation strategy are presented. The high-frequency stage switches located on the primary side of the transformer operate with soft switching of the ZVS type, while the four quadrant switches that form the output stage operate with soft switching of the ZCS type. Experimental data on a 1.5 kW experimental prototype that was designed, built and tested in the laboratory, with 220 VRMS input, 220 VRMS output and 40 kHz switching frequency are given in the paper. The studied converter can be considered a candidate for the building block of medium voltage solid-state transformers (SST) for power distribution systems.<br>

An Interleaved LLC Resonant Converter Operating at Constant Switching Frequency

2014 ◽  
Vol 29 (6) ◽  
pp. 2931-2943 ◽  
Author(s):  
Zhiyuan Hu ◽  
Yajie Qiu ◽  
Laili Wang ◽  
Yan-Fei Liu
Keyword(s):  
Switching Frequency ◽  
Resonant Converter ◽  
Llc Resonant Converter

scholarly journals An LLC and LCL-T Resonant Tanks Based Topology for Battery Charger Application

2021 ◽  
Vol 6 (4) ◽  
pp. 263-275
Author(s):  
Yuqi Wei ◽  
Keyword(s):  
Charge State ◽  
Current Source ◽  
Design Guidelines ◽  
Constant Current ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Magnetic Components ◽  
Wide Range ◽  
Charging Current ◽  
Llc Resonant Converter

To achieve the constant current (CC) and constant voltage (CV) charge of the lithium battery, the traditional LLC resonant converter requires the switching frequency varies in a wide range, which brings difficulty to the magnetic components design, and the system efficiency would also be degraded. In this article, a novel topology based on LLC and LCL-T resonant tanks is proposed to reduce the range of operating switching frequency. During the CC charge state, the proposed converter is operating with the LCL-T resonant tank, and it can be regarded as a current source, which provides constant charging current to the battery. During the CV charge state, the LCL-T resonant tank is bypassed and the structure of the proposed converter is modified to a traditional LLC resonant converter, and it is functioning as a CV source. Owing to the high accuracy of the CC and voltage sources, the required operating switching frequency range can be significantly reduced when compared with traditional LLC approaches. Operational principles and design guidelines for the proposed converter are described. Experiment and simulation results from a 180 W prototype are provided to validate the theoretical analysis.

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 A Si-FET-Based High Switching Frequency Three-Level LLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3082
Author(s):  
Yang ◽  
Han
Keyword(s):  
Optimal Design ◽  
High Performance ◽  
Input Voltage ◽  
Switching Frequency ◽  
Design Consideration ◽  
Resonant Converter ◽  
Switching Losses ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Resonant Inductor

This paper highlights the proposed silicon field-effect transistor (Si-FET)-based high switching frequency three-level (TL) LLC resonant converter. It provides a detailed operational analysis of the converter; the multilevel (ML) organization of cells; voltage-balancing principles; current-balancing principles; loss comparison between Si-FETs and gallium-nitride (GaN)-FETs; and an optimal design consideration based on loss analysis. This analysis reveals that the switching losses of all power switches can be considerably reduced as the voltage across each switch can be set to half of the input voltage without an additional circuit or control strategy. Moreover, the current of each resonant inductor is automatically balanced by a proposed integrated magnetic (IM)-coupled inductor. Therefore, the operating frequency can be easily increased to near 1 MHz without applying high-performance switches. In addition, the resonant tanks of the converter can be a group of cells for multilevel operation, which indicates that the voltage across each switch is further reduced as more cells are added. Based on the results of the analysis, an optimal design consideration according to the resonant tank and switching frequency is discussed. The proposed converter was validated via a prototype converter with an input of 390 V, an output of 19.5 V/18 A, and a frequency of 1 MHz.

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