6Ortmaier T, Weiss H, Falk V. Design requirements for anew robot for minimally invasive surgery[J], Industrial Ro-bot: An International Journal,2004,11(31):493-498.
7Sanmin W,Bin W, Fahai L,et al. A general space vectorPWM control algorithm for multilevel inverters width mod-ulationfj]. Applied Power Electronics Conference and Ex-position ,2003(18):562-568.
8Lee S G,Kang D W, Lee Y H,et. al. The carrier-basedPWM method for voltage balance of flying capacitor multi-level inverter[C]//Proceedings of IEEE Annual Power E-lectronics Specialists Conference,2001 : 126-131.