耦合电感单级升压逆变器

A Novel Single-stage Boost Inverter With Coupled Inductors

传统的两级式升压变换器通常由Boost变换器作为前级,以提升输入电压至合适的母线电压,防止输入电压较低时无法输出所需的交流电压。当升压比要求很高时,Boost变换器的占空比就会接近极限,过大的占空比会恶化Boost变换器的二极管反向恢复问题,增加开关管的开关损耗,降低效率。提出一种新型单级升压逆变器,在典型三相桥前加入包括耦合电感在内的无源网络,通过对耦合电感的设计和逆变桥直通时间的控制,可以使逆变器在直流输入电压较低时仍实现中间母线电压幅值的较大提升,输出稳定的交流电压。理论分析和实验结果表明该单级升压逆变器具有良好的性能。

Boost type DC-DC converter is often utilized in applications where DC input voltage is lower than AC output, to step up bus voltage. When a high Boost gain is required, the duty cycle of the Boost converter will come to its extreme, meanwhile large duty cycle also causes serious diode reverse- recovery problem. This paper presented a novel single-stage Boost inverter. By introducing a unique passive network with coupled inductors and previously forbidden shoot-through zero states, this converter can output AC voltage much higher than the DC input. The single-stage operation of the converter can lead to improved reliability, high efficiency and low cost. Theoretical analysis and experimental results were presented to verify its good performance.