摘要
提出了一种新型的单级串联谐振型Buck-Boost逆变器,它能在一个功率级内产生峰值高于或低于输入直流电压的正弦交流电压。文中详细分析了所提逆变器的工作原理,并利用状态空间平均法建立了系统数学模型。基于断续导电模式,所提逆变器拓扑利用串联谐振单元实现所有开关的零电流开通和辅助开关的零电流关断,减小了开关损耗,提高了系统效率。为了改善逆变器的输出特性,提出一种改进的SPWM控制方法,该方法采用带直流偏置的正弦调制波,消除了线性近似法所导致的输出电压波形过零点附近的畸变。通过一台1kW原理样机的实验结果,验证了该变换器的优点和改进SPWM控制方法的有效性。
A novel single-stage series-resonant Buck-Boost inverter is proposed in this paper, which can generate a sine ac output voltage larger or lower than the input one in a single stage. The operation principle is analyzed in detail and the mathematics model is founded by the state-space average method. Based on discontinuous conduction mode （DCM）, the new inverter circuit topology provides all the switches for turn-on and the auxiliary switches for turn-off at zero current switching （ZCS） by a series-resonant tank, so that the switching loss is reduced and system effeciency is improved. An improved SPWM control method employing a sine modulation wave with dc bias value is presented to optimize the inverter performance. The proposed control method eliminates the output voltage zero-crossing distortion as caused by linear approximation in traditional SPWM method, Laboratory experimental results from a lkW prototype are given to verify the validity and effectiveness of the proposed inverter.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第16期65-71,共7页
Proceedings of the CSEE
