Resonant dc link inverter is a zero voltage switching inverter.This paper proposes a new cascade resonant dc link inverter that consists of two power converter units,a rugged resonant dc link and an inverter bridge.A ...Resonant dc link inverter is a zero voltage switching inverter.This paper proposes a new cascade resonant dc link inverter that consists of two power converter units,a rugged resonant dc link and an inverter bridge.A detailed analysis of the soft switching process in the rugged resonant dc link and the realization of pulse width modulation (PWM) control strategy in the inverter bridge are presented in the paper. The operation modes, the input and output features and the interface between the rugged resonant dc link and the inverter bridge are also discussed. The relationship between the circuit features and the parameters is deduced, which provides a theoretical base for the circuit design. The analysis results show that the rugged resonant dc link can be regulated by open-loop control and the control of the rugged resonant dc link is independent of that of the inverter bridge, which makes the inverter control easy and realizable.The circuit of the inverter is simulated with a standard circuit simulation program PSPICE. The simulation results are corresponding to the predicted ones of the circuit analysis.展开更多
采用多电平电路来构建双有源桥(dual active bridge,DAB)直流变换器可实现更高的电压等级与功率密度及更好的性能。基于半桥有源中点钳位型(active neutral point clamped,ANPC)三电平电路构建半桥ANPC-DAB电路,通过分析开关状态切换过...采用多电平电路来构建双有源桥(dual active bridge,DAB)直流变换器可实现更高的电压等级与功率密度及更好的性能。基于半桥有源中点钳位型(active neutral point clamped,ANPC)三电平电路构建半桥ANPC-DAB电路,通过分析开关状态切换过程中零电压开通(zerovoltage switching,ZVS)的软开关特性,得出使全部12个开关管实现ZVS开通的条件。在此基础上,通过分析零电平开关状态对损耗分布的影响,提出一种能够有效改善开关管损耗分布的调制方法。为验证DAB的损耗分布及效率,对半桥ANPC-DAB建立损耗模型,对开关管的损耗分布及DAB的效率进行仿真分析。最后,通过1.5k W的实验样机完成实验验证。仿真与实验结果表明,所提出的调制方法在全部开关管实现ZVS的同时,有效地改善了功率器件的损耗分布。展开更多
介绍一种用于逆变电源功率调节的新型零电流转换-脉宽调制(Zero Current Transition-Pulse Width Modulation,简称ZCT-PWM)直流斩波器,与传统Buck-PWM斩波器相比,增加了一个辅助功率开关器件及谐振电感和谐振电容等,克服了传统ZCT-PWM...介绍一种用于逆变电源功率调节的新型零电流转换-脉宽调制(Zero Current Transition-Pulse Width Modulation,简称ZCT-PWM)直流斩波器,与传统Buck-PWM斩波器相比,增加了一个辅助功率开关器件及谐振电感和谐振电容等,克服了传统ZCT-PWM斩波器不能零电流开通(ZCS)和负载续流二极管不能软关断的缺点。该斩波器具有开关损耗低,结构简单,控制方便等优点,适合用于以IGBT为开关器件的高频电源场合。采用高速IGBT开关器件设计了一台5kW/50kHz逆变电源样机。实验结果表明,该样机能高效、可靠地运行在高频大负载变化范围内。展开更多
文摘Resonant dc link inverter is a zero voltage switching inverter.This paper proposes a new cascade resonant dc link inverter that consists of two power converter units,a rugged resonant dc link and an inverter bridge.A detailed analysis of the soft switching process in the rugged resonant dc link and the realization of pulse width modulation (PWM) control strategy in the inverter bridge are presented in the paper. The operation modes, the input and output features and the interface between the rugged resonant dc link and the inverter bridge are also discussed. The relationship between the circuit features and the parameters is deduced, which provides a theoretical base for the circuit design. The analysis results show that the rugged resonant dc link can be regulated by open-loop control and the control of the rugged resonant dc link is independent of that of the inverter bridge, which makes the inverter control easy and realizable.The circuit of the inverter is simulated with a standard circuit simulation program PSPICE. The simulation results are corresponding to the predicted ones of the circuit analysis.
文摘采用多电平电路来构建双有源桥(dual active bridge,DAB)直流变换器可实现更高的电压等级与功率密度及更好的性能。基于半桥有源中点钳位型(active neutral point clamped,ANPC)三电平电路构建半桥ANPC-DAB电路,通过分析开关状态切换过程中零电压开通(zerovoltage switching,ZVS)的软开关特性,得出使全部12个开关管实现ZVS开通的条件。在此基础上,通过分析零电平开关状态对损耗分布的影响,提出一种能够有效改善开关管损耗分布的调制方法。为验证DAB的损耗分布及效率,对半桥ANPC-DAB建立损耗模型,对开关管的损耗分布及DAB的效率进行仿真分析。最后,通过1.5k W的实验样机完成实验验证。仿真与实验结果表明,所提出的调制方法在全部开关管实现ZVS的同时,有效地改善了功率器件的损耗分布。
文摘介绍一种用于逆变电源功率调节的新型零电流转换-脉宽调制(Zero Current Transition-Pulse Width Modulation,简称ZCT-PWM)直流斩波器,与传统Buck-PWM斩波器相比,增加了一个辅助功率开关器件及谐振电感和谐振电容等,克服了传统ZCT-PWM斩波器不能零电流开通(ZCS)和负载续流二极管不能软关断的缺点。该斩波器具有开关损耗低,结构简单,控制方便等优点,适合用于以IGBT为开关器件的高频电源场合。采用高速IGBT开关器件设计了一台5kW/50kHz逆变电源样机。实验结果表明,该样机能高效、可靠地运行在高频大负载变化范围内。
