【摘要】 为满足光伏发电等可再生能源应用的前端要求,提出了一种新型的高增益DC/DC变换器。该变换器结合多绕组耦合电感器和倍压单元,通过改变耦合电感电压比来实现高电压增益,使其无需使用极端占空比。输出侧的串联结构提升了电压增益,且增加的耦合电感绕组可以继续加上倍压单元做扩展。另外,通过无源吸收电路,有效吸收漏感。该变换器具有低电压应力和高升压比的特点。首先分析了CCM模式下该电路的工作原理,理论推导各模式特性,并对扩展电路进行讨论。最后通过30 V/380 V,功率为200 W的实验样机验证了理论分析的正确性。更多还原

【Abstract】 In order to meet the front-end requirements of renewable energy applications such as photovoltaic power generation,a new type of high-gain DC/DC converter was proposed. The converter combined a multiwinding coupled inductor with a voltage doubler cell to achieve a high voltage gain by varying the coupled inductor voltage ratio,so as to eliminate the need for an extreme duty cycle. The voltage gain was increased by the series structure on the output side,and the added coupled inductor winding could be extended with a voltage doubler cell. In addition,through the passive absorption circuit,the leakage inductance was absorbed effectively.The proposed converter had the characteristics of low voltage stress and high boost ratio. The working principle of the proposed circuit in CCM mode was analyzed firstly,and then its main performance characteristics were theoretically derived,and the extended circuit was discussed. Finally,the correctness of the theoretical analysis was verified by an experimental prototype of 30 V/380 V and a power of 200 W.更多还原