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死区时间内自适应同步整流导通时间控制以改善LLC谐振变换器轻载性能

Adaptive Synchronous Rectifier On-Time Control Within Dead-Time for Improving Light-Load Performance of LLC Resonant Converters

语言:

中文摘要

LLC谐振变换器在轻载下表现出非单调电压增益特性,可能导致传统脉冲频率调制(PFM)策略失效,并因开关频率过高导致效率下降。为此,本文提出了一种在死区时间内进行自适应同步整流(SR)导通时间控制的方法,以实现LLC变换器电压增益的归一化,从而优化轻载效率。

English Abstract

LLC resonant converter exhibits nonmonotonic voltage gain at light-load, which could lead to the malfunction of traditional pulse frequency modulation strategy and degraded efficiency due to excessive increase in switching frequency. To address this issue, an adaptive synchronous rectifier (SR) on-time control within dead-time is proposed for LLC resonant converters to normalize the voltage gain a...
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SunView 深度解读

该技术对阳光电源的户用光伏逆变器及储能系统(如ST系列PCS)具有重要参考价值。在户用及工商业场景中,设备常处于轻载运行状态,LLC拓扑作为DC-DC级核心,其轻载效率直接影响整机能效指标。通过引入死区内的自适应SR控制,可有效抑制轻载下的频率漂移,提升系统在宽负载范围内的转换效率。建议研发团队在下一代高功率密度户用逆变器及小型储能变流器中评估该控制策略,以优化待机及轻载功耗,提升产品竞争力。