A single-phase, three-level dc-to-ac power converter using unipolar switching method with low switching loss is designed to reduce the output voltage harmonics and increase conversion efficiency.

• 负载侧或并联市电侧之直流-交流功率转换器将采用单相三阶层直流-交流功率转换器，以减少输出电压之谐波含量，并使用低损失之单极式正弦脉波宽度调变技术以提高转换效率。