基于谐振腔电流优化的CLLC变换器参数设计

电器与能效管理技术 ›› 2025, Vol. 0 ›› Issue (4): 31-40.

基于谐振腔电流优化的CLLC变换器参数设计

李世茂, 黄晓生, 沈焜, 林抒毅

福建理工大学电子电气与物理学院, 福建福州 350118

收稿日期:2025-01-02 出版日期:2025-04-30 发布日期:2025-06-06
作者简介:李世茂(1999—),男,硕士研究生,研究方向为功率变换器。|黄晓生(1986—),男,博士,副教授,研究方向为电力电子功率变换及高频电磁技术。|沈焜(2000—),男,硕士研究生,研究方向为高频磁技术。
基金资助:
国家自然科学基金项目(51607039);福建省自然科学基金项目(2023J01949);福建省自然科学基金项目(2022J01950)

Parameter Design of CLLC Converter Based on Resonant Cavity Current Optimization

LI Shimao, HUANG Xiaosheng, SHEN Kun, LIN Shuyi

School of Electronics, Electrical and Physics, Fujian University of Technology, Fuzhou 350118, China

Received:2025-01-02 Online:2025-04-30 Published:2025-06-06

摘要/Abstract

摘要：

CLLC变换器因其宽电压增益范围且易实现软开关的优点被广泛应用于新能源功率变换系统中。然而,其设计广泛使用的基波近似法在远离谐振点时存在较大误差,因此从谐振腔电流优化的角度提出一种基于时域模型的CLLC变换器参数设计方法。首先,基于时域模型分析变换器的电压增益及谐振腔电流特性,并提出一种特征阻抗与谐振电流的约束函数。然后,以增益、模式边界及零电压开关(ZVS)条件进行约束得到参数设计域,并用约束函数在区域内获得优化设计点。最后,通过所设计的1 kW实验样机验证了所提方法的可行性,样机峰值效率达到97.48%。

关键词: CLLC变换器, 时域模型, 谐振电流, 效率优化

Abstract:

CLLC converters are widely used in new energy power conversion systems because of their wide voltage gain range and easy realization of soft switching. However, the fundamental wave approximation method widely used in its design has the relatively large errors when it is far away from the resonant point. Therefore, a parameter design method of CLLC converter based on the time domain model is proposed from the perspective of resonant cavity current optimization. Firstly, the voltage gain of the converter and the current characteristics of the resonant cavity are analyzed based on the time domain model, and a constraint function of characteristic impedance and resonant current is proposed. Then, the parameter design domain is obtained with the domain using the constraining the gain, mode boundary and zero voltage switching(ZVS)condition, and the optimal design point is obtained with the domain using the constraint function. Finally, a 1 kW prototype is designed to verify the feasibility of the proposed method, and the peak efficiency of the prototype reaches 97.48%.

Key words: CLLC converter, time domain model, resonant current, efficiency optimization

中图分类号:

TM46

李世茂, 黄晓生, 沈焜, 林抒毅. 基于谐振腔电流优化的CLLC变换器参数设计[J]. 电器与能效管理技术, 2025, 0(4): 31-40.

LI Shimao, HUANG Xiaosheng, SHEN Kun, LIN Shuyi. Parameter Design of CLLC Converter Based on Resonant Cavity Current Optimization[J]. LOW VOLTAGE APPARATUS, 2025, 0(4): 31-40.

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参考文献 15

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模式边界	约束条件
OPO/PO	u_{mn_P}(0)-u_{2n_P}(0)=M
PO/PON	u_{mn_O}(θ_O)-u_{2n_O}(θ_O)=-M
NP/NOP	u_{mn_N}(θ_N)-u_{2n_N}(θ_N)=M

设计点	参数(k,Z_r/Ω)	L_rp、L_m/μH	I_p、I_s电流有效值/A
优化点a	0.235, 26.50	21.10, 89.74	4.804,3.460
对比点1	0.350, 26.50	21.10, 60.29	6.116,3.510
对比点2	0.350, 80.00	63.60, 181.89	3.387,3.451
基于FHA 设计	0.740, 92.08	73.27, 98.90	4.810,4.020

参数	计算值	实际值
电感比k	0.235	0.239
特征阻抗Z_r/Ω	26.50	26.44
一次侧谐振电感L_p/μH	21.10	21.37
一次侧谐振电容C_p/nF	30.00	30.57
励磁电感L_m/μH	89.80	89.26
二次侧谐振电感L_s/μH	14.70	15.08
二次侧谐振电容C_s/nF	43.06	42.93