开关-耦合电感DC-DC变换器

本文提出了开关-耦合电感DC-DC变换电路。在针对已经含有开关电感模块和耦合电感模块的DC-DC拓扑族的研究之上，将开关电感和耦合电感进行耦合，使其作为开关-耦合电感发挥作用，进而得到高电压增益、效率得到改善的新式软开关DC-DC变换器。该类变换器集成了含有开关电感模块和耦合电感模块的DC-DC变换器的升压功能，并且同时实现了有源器件的软开关，改善了效率。主要有源器件S在导通的时候实现了零电流导通（ZCS），减少了它的损耗。关断时漏感能量通过嵌位二极管传递到输出侧，减少了能量损耗、改善了EMI环境。整流二极管能够在零电流（ZCS）情况下关断，此状态优化可以二极管的反向恢复特性，降低反向关断时的损耗。以开关-耦合电感Boost变换器为例进行了该类电路的研究，分别分析了电路的工作原理和周期工作模式，并推导了电压增益的数学公式。在理论指导下，采用200W开关-耦合电感Boost实验样机，证实所提电路理推理的可实施性和准确性。

Switched-Coupled inductor DC-DC Converters

In this paper, a novel high efficiency high step-up dc-dc converter is presented, which inherits all advantages of both switched-inductor dc-dc converter and coupled-inductor dc-dc converter. The proposed converter can achieve high step-up capability with suitable duty cycle D (high or small D leads to the bad efficiency), obtain soft-switching conditions of active devices (including switch and rectified diodes), and recycle the energy of leakage inductance to the output capacitor, which results in the high efficiency. The switch of converter operates in ZCS turn-on condition, which decreases the switching loss and improves the switch operating environment. The rectifier diodes cut off with ZCS condition, which improves the Reverse recovery characteristics of diodes. The voltage relationships, operating principle, and operating modes are described in detail. Finally, experimental results verify the validity of the proposed switched-coupled inductor DC-DC converter.