软开关脉宽调制变频技术     

陈国呈  谷口胜则  中村博人 《上海大学学报(英文版)》2000,4(4):304-308

In this paper, a new soft-switching inverter using a minimum number of devices, and a new PWM (pulse-width modulation) method suitable for 3-phase soft-switching inverters are proposed. The circuit is used as an interface between the DC supply and the conventional voltage source of a PWM inverter. The number of switching operations can be reduced by using the PWM strategy. Increasing the amplitude of the fundamental component contained in the output waveform results in an effective utilization of the DC supply, a reduction of nominated capacity of the inverter elements, and a reduction of switching loss in the switching devices. Supported by National Natural Science Foundation of China (59977012)  相似文献   

计算机仿真技术在电力电子技术课堂教学难点中的应用     

荣军  万军华  陈曦  万力 《实验技术与管理》2012,29(8):103-105

针对电力电子技术课堂教学难点,将计算机仿真技术引入课堂教学中,能起到事半功倍的效果,教师讲课不仅轻松许多,而且学生学习兴趣浓厚和学习效果好,这为电力电子技术课堂教学中处理教学难点问题提供了很好的教学思路。通过实践证明,在电力电子技术难点教学过程中,将计算机仿真技术引入教学设计中,不但提高了电力电子技术课堂教学效果,而且能够引导学生将课堂所学理论知识应用于实际应用中,达到了培养工程应用型人才的作用。  相似文献   

三相两电平软开关电路的研究     

赵秀芬  程相波  杜莉 《北京工业职业技术学院学报》2012,11(3):43-48

随着电力电子学的飞速发展,经典的开关电源由于功率因数低、开关损耗大、谐波含量高等缺点已不能满足高频开关电源的发展要求。为了解决这问题,将功率因数校正技术和软开关技术结合使用使功率开关器件工作在零电压或零电流状态,降低了开关损耗、提高了功率因数。  相似文献   

PWM逆变器载波方式的选择   总被引：1，自引：2，他引：1  

陈国呈  屈克庆  许春雨  孙承波 《上海大学学报(英文版)》2003,7(4):389-394

In this paper the influence of different carrier waveforms upon the output characteristics of PWM inverter is described in detail. When a triangular carrier waveform is used in hard-switching PWM inverters, harmonics exist in the neighborhood of the output frequency of the inverter output voltage and current due to the dead time. The triangular carrier waveform used in soft-switching PWM inverter will cause difficulties in controlling resonance-trigger time, higher loss in the resonant circuit, and less utilization of the DC bus voltage. If a sawtooth carrier is used in hard-switching PWM inverter, there will be severe distortion in the current waveform. When sawtooth carriers with alternate positive and negative slopes are used in soft-switching PWM inverters, the resonancetrigger time is easy to control, and distortion in the output voltage and current caused by the dead time will not appear.  相似文献   

1kW光伏逆变系统的设计     

陈晓 《安阳工学院学报》2015,(4):24-28

针对中小型光伏发电系统的特点,基于两级式变流器结构,前级采用隔离型全桥DC/DC升压电路,使用移相PWM软开关控制,后级采用全桥逆变电路,使用单极性倍频SPWM控制,研制了1kW的光伏逆变系统。该系统具有独立/并网两种工作模式,可稳定输出标准正弦单相220V/50Hz交流电压。  相似文献