A cascaded high step-up DC-DC converter with three-winding coupled inductor is proposed in this paper. Through the three-winding coupled inductor, switched-capacitor technique and cascaded structure, the converter achieves high step-up voltage gain without large duty cycle. The input inductor of the proposed converter can reduce the input current ripple, hence stress on the input source is reduced. Additionally, the energy stored in the leakage inductor of the coupled inductor is recycled to the output terminal, which not only improves efficiency but also alleviates large voltage spike to reduce the voltage stress. The operating principles and steady-state analyses of continuous-conduction mode are discussed in detail in this paper. Finally, a prototype sample with 30V input and 380V/0.3A output is implemented and the experimental results verify the correction of the theoretical analysis.%提出一种带三绕组耦合电感的级联型高增益功率变换器.采用三绕组耦合电感、开关电容技术和级联结构,该变换器可实现更高电压增益.变换器的输入电感可有效降低输入电流纹波,从而减小输入电源应力.此外,耦合电感的漏感能量由输出端回收利用,提升效率的同时,能够抑制开关管的电压尖峰,降低其电压应力.详细分析带三绕组耦合电感的级联型高增益功率变换器的工作原理,以及连续导通模式下变换器的稳态性能.最后搭建一台30V输入、380V/0.3A输出的实验样机,实验结果验证了理论分析的正确性.
展开▼
