Light-load performance optimization for LLC resonant converter

IF 0.8 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Circuit World Pub Date : 2023-10-13 DOI:10.1108/cw-01-2023-0006

Xuliang Yao, Xiao Han, Yuefeng Liao, Jingfang Wang

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引用次数: 1

Abstract

Purpose This study aims to solve the problem that under light-load conditions, the output voltage regulation capability is lost due to the fact that the voltage gain of the LLC resonant converter does not decrease with the increase of the switching frequency. Design/methodology/approach In this paper, the impedance model considering the parasitic parameters of the primary and secondary sides is calculated under light-load conditions, the limitations of the previous method are explained and a new circuit improvement is proposed. Findings In this paper, an improved circuit is proposed, and the impedance Bode plot is used to verify that the circuit can effectively improve the voltage gain problem under light-load conditions. Finally, the experimental results verify the effectiveness of the proposed circuit through comparison with traditional solutions and circuits. Originality/value In this paper, the impedance model considering the parasitic parameters of the primary and secondary sides is calculated, the limitations of the previous method are explained and a new circuit improvement is proposed. When compared with the previous method, the proposed circuit improvement can suppress the voltage gain increase that occurs when the switching frequency increases to a certain level.

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LLC谐振变换器轻载性能优化

本研究旨在解决在轻负载条件下，LLC谐振变换器的电压增益不随开关频率的增加而降低而丧失输出稳压能力的问题。本文在轻载条件下计算了考虑一次侧和二次侧寄生参数的阻抗模型，说明了以往方法的局限性，并提出了一种新的电路改进方法。本文提出了一种改进电路，并利用阻抗波德图验证了该电路能有效改善轻负载条件下的电压增益问题。最后，通过与传统解决方案和电路的对比，验证了所提电路的有效性。本文计算了考虑一次侧和二次侧寄生参数的阻抗模型，说明了原有方法的局限性，并提出了一种新的电路改进方法。与之前的方法相比，所提出的电路改进可以抑制开关频率增加到一定水平时电压增益的增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Circuit World 工程技术-材料科学：综合

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Circuit World is a platform for state of the art, technical papers and editorials in the areas of electronics circuit, component, assembly, and product design, manufacture, test, and use, including quality, reliability and safety. The journal comprises the multidisciplinary study of the various theories, methodologies, technologies, processes and applications relating to todays and future electronics. Circuit World provides a comprehensive and authoritative information source for research, application and current awareness purposes. Circuit World covers a broad range of topics, including: • Circuit theory, design methodology, analysis and simulation • Digital, analog, microwave and optoelectronic integrated circuits • Semiconductors, passives, connectors and sensors • Electronic packaging of components, assemblies and products • PCB design technologies and processes (controlled impedance, high-speed PCBs, laminates and lamination, laser processes and drilling, moulded interconnect devices, multilayer boards, optical PCBs, single- and double-sided boards, soldering and solderable finishes) • Design for X (including manufacturability, quality, reliability, maintainability, sustainment, safety, reuse, disposal) • Internet of Things (IoT).