目前文献中的四边形控制方法及其改进方案,能实现非反向Buck-Boost变换器各开关管的ZVS,但存在如下问题：需使用多维查找表或外部存储设备而无在线检测实时计算的闭环、较大的通态损耗和多模式切换引起的输出电压波动等。该文针对上述3个问题提出一种三段式变频ZVS控制策略。首先,去除四边形控制中电感电流的环流续流环节,以减小电感电流有效值并提高效率。其次,在不添加任何额外有源或无源器件的条件眄,将整个宽输入电压范围分成3个模式,分析每个模式的特点,以增加控制条件和简化计算过程,同时实现各模式的在线实时恒压闭环和通态损耗最小ZVS而无需使用多维查找表和线性插值,整体控制简单易实现。然后,提出基于三段式ZVS控制的多模式平滑切换控制策略,可保证在模式切换时各开关管占空比跳变前后,闭环输出始终保持稳定。最后,本文给出了各模式区间划分的理论依据,并搭建500 W实验样机验证了所提方案的有效性。
Abstract
The quadrangle control method and its improvement scheme in the existing literature can realize ZVS of all switches in noninverting Buck-Boost converter, but it has the following problems： the need to use multidimensional look-up tables or external storage devices, without closed loop control of real-time calculation, large on-state loss, and output voltage fluctuation caused by multimode switching. The proposed three-segment variable frequency ZVS control strategy solves the three problems. Firstly, the circulating current freewheeling link of the inductor current in the quadrilateral control is removed, which significantly reduces the effective value of the inductor current and improves the efficiency. Secondly, without any additional active or passive components, by dividing the entire wide input voltage range into three modes, after independently analyzing the characteristics of each mode, control conditions can be added, and the online realtime closed-loop and minimum conduction loss ZVS of each mode can be realized at the same time. There is no need to use multi-dimensional lookup table and linear interpolation, and the overall control is simple and easy to achieve. Thirdly, a multimode smooth switching control strategy is proposed, which can ensure that the output voltage is always stable before and after the duty cycle of each switch jumps during mode switching. The theoretical basis for division of each mode is provided, and a 500 W experimental prototype is built to verify the effectiveness of the proposed scheme.
关键词
DC-DC变换器 /
ZVS /
数字控制系统 /
模式切换 /
非反向Buck-Boost变换器
Key words
DC-DC converter /
ZVS /
digital control system /
mode switching /
noninverting Buck-Boost converter
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参考文献
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基金
河北省自然科学基金重点项目（E2021203162）; 河北省重点研发计划（19214405D）
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