PWM and PFM Hybrid Control Method for LLC Resonant Converters in High Switching Frequency Operation

被引：120
作者：
Park, Hwa-Pyeong [1 ]
Jung, Jee-Hoon [1 ]
机构：
[1] Ulsan Natl Inst Sci & Technol, Sch Elect & Comp Engn, Ulsan 44919, South Korea
来源：
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2017年 / 64卷 / 01期
关键词：
High-frequency operation; hybrid control; LLC resonant converter; pulse frequencymodulation (PFM); pulse width modulation (PWM); DESIGN METHODOLOGY; DC/DC CONVERTER;
D O I：
10.1109/TIE.2016.2599138
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
High switching frequency is an effective method to improve power density for LLC resonant converters. However, conventional digital controllers, such as general-purpose digital signal processors andmicroprocessors, have limited frequency resolution, which induces high primary-and secondary-side current variation and leads to poor output voltage regulation. In this paper, a hybrid control method combining pulse frequency modulation (PFM) and pulse width modulation is proposed to overcome the limited frequency resolution issue. The proposed hybrid control method focuses on steady-state operation, and its operating principles are introduced and analyzed. In addition, the proper magnetizing inductance and dead time duration are derived to ensure that the power mosfets achieve zero voltage switching with the proposed control method. The improved voltage regulation performance is compared with the conventional PFM control and verified through simulation and experimental results using a 240 W prototype converter operating at a switching frequency of 1 MHz.
引用
收藏
页码：253 / 263
页数：11
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