为改善光伏直流模块的变换效率,提出一种低电压应力零电压开关（ZVS）高增益Boost变换器。该变换器采用分裂开关电容和电荷泵两种升压单元,使电压增益和功率管电压应力变为传统Boost变换器的2倍和1/2倍,同时将分裂开关电容网络中的二极管替换为同步整流开关管,并使后级电感电流双向流通,且峰峰值满足特定约束关系,从而在整个工作条件范围内实现所有开关管的ZVS开通和二极管的自然关断或近零电流关断。首先分析变换器的工作原理和稳态特性,然后给出软开关实现条件和电感参数设计方法,最后通过一台250 W的样机实验验证理论分析的正确性,结果表明变换器的最大效率可达97.6%。
Abstract
In order to improve the conversion efficiency of photovoltaic DC modules, a high-gain Boost converter with low voltage stress and zero-voltage-switching （ZVS） is proposed. Benefitting from the split-switched-capacitor and charge pump circuits, the voltage gain and power transistor voltage stress becomes twice and half times that of a conventional Boost converter. Furthermore, one diode in the split-switched capacitor network has been substituted with a synchronous rectifier switch. Meanwhile, the rear-end inductor current is allowed to flow in both directions and with a specific constrained peak-to-peak value, thus achieving ZVS turn-on of all switches and natural turn-off or near zero-current turn-off of the diodes throughout the entire operating condition range. Firstly, the working principle and steady-state characteristics of the converter were analyzed, followed by the implementation conditions of soft switching and the design method of inductance parameters. Finally, the theoretical analysis was validated through experiments on a 250 W prototype. The research results show that the maximum efficiency of the converter can reach 97.6%.
关键词
光伏 /
零电压开关 /
Boost变换器 /
高增益 /
分裂开关电容 /
低电压应力
Key words
photovoltaics /
zero voltage switching /
Boost converter /
high-gain /
split switched capacitor /
low voltage stress
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