A Constant Current Primary-side Regulation Control Algorithm for Primary-side Regulation Half-bridge LLC Resonant Converter

WANG Chong; ZHAO Xiaojing; CONG Lihui; SUN Daying; GUO Jingjing; GU Wenhua; {{custom_author.name_en}}

doi:10.13334/j.0258-8013.pcsee.241876

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A Constant Current Primary-side Regulation Control Algorithm for Primary-side Regulation Half-bridge LLC Resonant Converter

更新时间：2026-02-05

- A Constant Current Primary-side Regulation Control Algorithm for Primary-side Regulation Half-bridge LLC Resonant Converter
- Vol. 45, Issue 18, Pages: 7325-7335(2025)
- 作者机构：
  
  1. 南京理工大学微电子学院,江苏省,南京市,210094
  2. 南京邮电大学集成电路科学与工程学院,江苏省,南京市,210023
  3. 南京理工大学微电子学院,江苏省,南京市,210094
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.241876
  CLC：
- Published：2025
- 稿件说明：
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WANG Chong, ZHAO Xiaojing, CONG Lihui, et al. A Constant Current Primary-side Regulation Control Algorithm for Primary-side Regulation Half-bridge LLC Resonant Converter[J]. 2025, 45(18): 7325-7335.
DOI：

WANG Chong, ZHAO Xiaojing, CONG Lihui, et al. A Constant Current Primary-side Regulation Control Algorithm for Primary-side Regulation Half-bridge LLC Resonant Converter[J]. 2025, 45(18): 7325-7335. DOI： 10.13334/j.0258-8013.pcsee.241876.

摘要

半桥LLC谐振变换器多采用副边光耦反馈方法实现电气隔离和输出控制，然而光耦器件存在非线性、老化、温漂等问题，降低了变换器输出精度与可靠性。原边反馈方法可以移除光耦器件并简化电路拓扑，但谐振变换器电流的非线性增加了输出电流的预测难度和电路复杂度，文中提出一种易实现的原边反馈半桥LLC谐振变换器高精度恒流输出控制方案。通过原边辅助绕组上的RC支路实现了励磁电流还原功能，并采用电压运算抵消励磁电流，模拟得到输出二极管电流波形；其次，通过选择合适的直流偏置，所设计控制方法能自适应实现高的输出电流预测精度；最后，在一台输入为380~420 V、输出为48~78 V/1.30 A的实验样机中，输出电流精度达到±2.3%，峰值效率达到95.8%，达到了较好的输出电流精度。

Abstract

In order to achieve electrical isolation and output control

the traditional half-bridge LLC resonant converter mostly adopts the secondary-side regulation (SSR)control method based on opto-couplers. However

opto-couplers introduce nonlinearity

aging effect

temperature drift and difficulty of integration

which reduces the output accuracy and reliability of the converter. Primary-side regulation (PSR) control method can remove the opto-coupler and simplify the circuit topology

but the nonlinear current of the resonant converter increases the difficulty of output current prediction and circuit complexity. This paper proposed a high precision constant-current output control scheme for PSR half-bridge LLC resonant converter. The magnetization current is restored through the RC branch of the primary-side auxiliary winding circuit

and voltage operation is used to remove the transformer magnetization current and acquire the output diode current wave. With proper selection of the dc bias voltage

adaptive high precision control of the output current can realized. An experimental prototype is built with an input of 380~420 V and an output of 48~78 V/1.30 A. After experiments

the output current accuracy reaches ±2.3%

and the peak efficiency of the system reaches 95.8%

which achieves a good output current accuracy.

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