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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >High Voltage Stress in Single-Phase Single-Stage PFC Converters: Analysis and an Alternative Solution
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High Voltage Stress in Single-Phase Single-Stage PFC Converters: Analysis and an Alternative Solution

机译：单相单级PFC转换器中的高压应力：分析和替代解决方案

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摘要

Single-stage power-factor-corrected (SPFC) power supplies usually suffer from high voltage stress, due to lack of control on the intermediate bus capacitor voltage. In the past, analysis of such voltage stress was mostly based on steady-state condition without providing sufficient explanation during the transient circuit operation. This paper revisits the problem at circuit level and reports that the root cause is due to the inherent negative current feedback property of the output inductor or the transformer operating in continuous conduction mode (CCM). Based on the finding, this paper further proposes a new approach to reducing the voltage stress by adding an auxiliary circuit branch to existing SPFC converters. The additional circuit branch limits the effect of negative current feedback by suppressing the change of output current slope due to change of load. This assists the pulsewidth modulation controller to track the change of load better such that the bus capacitor voltage range is reduced through duty cycle control. The auxiliary circuit branch also reduces reverse-recovery-related losses of the converter under CCM operation. A laboratory prototype using the popular boost PFC converter combined flyback dc/dc converter was built and tested to confirm the analysis and effectiveness of the approach.
机译：由于缺乏对中间总线电容器电压的控制，单级功率因数校正（SPFC）电源通常会遭受高电压应力。过去，这种电压应力的分析主要基于稳态条件，而在瞬态电路工作期间没有提供足够的解释。本文从电路层面重新审视了该问题，并报告了根本原因是由于输出电感器或以连续导通模式（CCM）工作的变压器固有的负电流反馈特性。基于这一发现，本文进一步提出了一种通过向现有SPFC转换器添加辅助电路分支来降低电压应力的新方法。附加电路分支通过抑制由于负载变化引起的输出电流斜率变化来限制负电流反馈的影响。这有助于脉冲宽度调制控制器更好地跟踪负载的变化，从而通过占空比控制来减小总线电容器的电压范围。辅助电路分支还减少了CCM操作下转换器的与反向恢复相关的损耗。使用流行的升压PFC转换器与反激式DC / DC转换器相结合的实验室原型已构建并经过测试，以确认该方法的分析和有效性。

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