提出了一种基于交错并联技术和Buck型三相单开关整流电路的零电流软开关ZCS(zero-currentswitching)电动汽车车载充电电路。采用多谐振结构保证Buck电路中的IGBT实现ZCS,续流二极管实现零电压软开关ZVS(zero-voltage-switching),满足车...提出了一种基于交错并联技术和Buck型三相单开关整流电路的零电流软开关ZCS(zero-currentswitching)电动汽车车载充电电路。采用多谐振结构保证Buck电路中的IGBT实现ZCS,续流二极管实现零电压软开关ZVS(zero-voltage-switching),满足车载充电器OBC(onboard charger)大功率、高效率、高功率密度的需求。首先分析了电路的工作原理,重点研究了电池负载情况下的ZCS实现条件;然后根据理论分析进行了硬件参数设计;最后,设计试制了一台8.5 k W样机进行了实验研究。利用电阻负载模拟电池特性,通过切换负载阻值模拟了三段式充电过程,结果表明所设计的OBC系统在整个三段式充电过程均能实现ZCS,且能够实现3个充电阶段的自动切换,满足蓄电池充电需求。展开更多
为实现一种结构简单,高效、高频、低电压应力,控制简单的软开关升压变换器,提出一种零电流软开关脉冲频率调制(pulse frequency modulation,PFM)变换器,并以其在boost变换器的应用为例分析了其工作原理、软开关实现条件以及该电路的设...为实现一种结构简单,高效、高频、低电压应力,控制简单的软开关升压变换器,提出一种零电流软开关脉冲频率调制(pulse frequency modulation,PFM)变换器,并以其在boost变换器的应用为例分析了其工作原理、软开关实现条件以及该电路的设计方法.仿真和实验结果表明:该变换器在较宽的输出电压、输入电压、负载及控制频率变化范围内,能够实现稳定的零电流开关.该软开关设计思想可以推广到其他基本DC-DC变换器中.展开更多
The FB-ZVZCS-PWM converter is realized by the way of subjoiningblock-capacitor into the FB-ZVS-PWM converter. At the freewheeling interval, the primary current isattenuated fast to zero and maintained. And then, power...The FB-ZVZCS-PWM converter is realized by the way of subjoiningblock-capacitor into the FB-ZVS-PWM converter. At the freewheeling interval, the primary current isattenuated fast to zero and maintained. And then, power device of the static leg becomes azero-current-switch (ZCS), power device of the shifted leg becomes a zero-voltage-switch(ZVS). Thus,on one hand IGBT (Insulated gate bipolar transistor) with tail current can be easily used infull-bridge soft-switching converter; on the other hand additional circuiting energy is greatlyreduced. At the same time, less duty cycle loss, lower secondary parasitic resonance, widersoft-switching load range can be achieved. Based on the existing component models in the Pspicesoftware package, a combined model of IGBT is established, in which a non-linear capacitor isintroduced to replace the parasitic capacitor. Using this model, computerized simulation isconducted for the FB-ZVZCS-PWM soft-switching converter, the switching and energy-transferringcharacteristics of the power device are analyzed. Finally, based on the achievement above, a 10 kWarc welding inverter with FB-ZVZCS-PWM converter is developed. The simulation results are testifiedby experiments. It is proved that by adopting appropriate models, computerized simulation is aneffective and useful tool for the development of the arc welding inverter.展开更多
This paper proposes the design and experimentation of digital control of soft-switched interleaved boost converter using FPGA for Telecommunication System. The switching devices in the proposed converter are turned on...This paper proposes the design and experimentation of digital control of soft-switched interleaved boost converter using FPGA for Telecommunication System. The switching devices in the proposed converter are turned on and off with Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) respectively. The circuit is operated in Continuous Conduction Mode (CCM) with various load ranges having duty cycle of more than 50%. The proposed converter is studied by developing the simulation module in MATLAB/SIMULINK. A PI controller is designed and implemented in FPGA to obtain a regulated DC output for line and load variations. Simulation and experimentation results are verified with a prototype development of the proposed converter. The results indicate that the converter performance is enhanced with closed loop control.展开更多
针对传统零电流开关ZCS(zero current switching)的开关电容变换器SCC(switched capacitor converters)的硬开关问题,提出了1种基于LC辅助网络的零电压电流开关ZVZCS(zero voltage and zero current switching)DC-DC SCC,使得所有功率...针对传统零电流开关ZCS(zero current switching)的开关电容变换器SCC(switched capacitor converters)的硬开关问题,提出了1种基于LC辅助网络的零电压电流开关ZVZCS(zero voltage and zero current switching)DC-DC SCC,使得所有功率开关均可实现全范围的零电压开关ZVS(zero voltage switching),并且在一定条件下可以同时实现ZVS和ZCS,大大减小了开关损耗。在此基础上,深入研究了死区时间对变换器的影响,揭示了不同负载条件下的死区时间选取与变换器损耗分布之间的定量关系,进而提出了基于死区时间的辅助网络关键参数的设计方法。最后,基于所提出的ZVZCS开关电容变换器,搭建了24 V DC-12 V DC、100 W的实验样机,实现了99.07%的峰值效率,验证了理论分析的正确性。展开更多
文摘提出了一种基于交错并联技术和Buck型三相单开关整流电路的零电流软开关ZCS(zero-currentswitching)电动汽车车载充电电路。采用多谐振结构保证Buck电路中的IGBT实现ZCS,续流二极管实现零电压软开关ZVS(zero-voltage-switching),满足车载充电器OBC(onboard charger)大功率、高效率、高功率密度的需求。首先分析了电路的工作原理,重点研究了电池负载情况下的ZCS实现条件;然后根据理论分析进行了硬件参数设计;最后,设计试制了一台8.5 k W样机进行了实验研究。利用电阻负载模拟电池特性,通过切换负载阻值模拟了三段式充电过程,结果表明所设计的OBC系统在整个三段式充电过程均能实现ZCS,且能够实现3个充电阶段的自动切换,满足蓄电池充电需求。
文摘为实现一种结构简单,高效、高频、低电压应力,控制简单的软开关升压变换器,提出一种零电流软开关脉冲频率调制(pulse frequency modulation,PFM)变换器,并以其在boost变换器的应用为例分析了其工作原理、软开关实现条件以及该电路的设计方法.仿真和实验结果表明:该变换器在较宽的输出电压、输入电压、负载及控制频率变化范围内,能够实现稳定的零电流开关.该软开关设计思想可以推广到其他基本DC-DC变换器中.
基金This project is supported by National Natural Science Foundation of China(No.50075003)Municipal Natural Science Foundation of Beijing, China(No.3001001).
文摘The FB-ZVZCS-PWM converter is realized by the way of subjoiningblock-capacitor into the FB-ZVS-PWM converter. At the freewheeling interval, the primary current isattenuated fast to zero and maintained. And then, power device of the static leg becomes azero-current-switch (ZCS), power device of the shifted leg becomes a zero-voltage-switch(ZVS). Thus,on one hand IGBT (Insulated gate bipolar transistor) with tail current can be easily used infull-bridge soft-switching converter; on the other hand additional circuiting energy is greatlyreduced. At the same time, less duty cycle loss, lower secondary parasitic resonance, widersoft-switching load range can be achieved. Based on the existing component models in the Pspicesoftware package, a combined model of IGBT is established, in which a non-linear capacitor isintroduced to replace the parasitic capacitor. Using this model, computerized simulation isconducted for the FB-ZVZCS-PWM soft-switching converter, the switching and energy-transferringcharacteristics of the power device are analyzed. Finally, based on the achievement above, a 10 kWarc welding inverter with FB-ZVZCS-PWM converter is developed. The simulation results are testifiedby experiments. It is proved that by adopting appropriate models, computerized simulation is aneffective and useful tool for the development of the arc welding inverter.
文摘This paper proposes the design and experimentation of digital control of soft-switched interleaved boost converter using FPGA for Telecommunication System. The switching devices in the proposed converter are turned on and off with Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) respectively. The circuit is operated in Continuous Conduction Mode (CCM) with various load ranges having duty cycle of more than 50%. The proposed converter is studied by developing the simulation module in MATLAB/SIMULINK. A PI controller is designed and implemented in FPGA to obtain a regulated DC output for line and load variations. Simulation and experimentation results are verified with a prototype development of the proposed converter. The results indicate that the converter performance is enhanced with closed loop control.
文摘针对传统零电流开关ZCS(zero current switching)的开关电容变换器SCC(switched capacitor converters)的硬开关问题,提出了1种基于LC辅助网络的零电压电流开关ZVZCS(zero voltage and zero current switching)DC-DC SCC,使得所有功率开关均可实现全范围的零电压开关ZVS(zero voltage switching),并且在一定条件下可以同时实现ZVS和ZCS,大大减小了开关损耗。在此基础上,深入研究了死区时间对变换器的影响,揭示了不同负载条件下的死区时间选取与变换器损耗分布之间的定量关系,进而提出了基于死区时间的辅助网络关键参数的设计方法。最后,基于所提出的ZVZCS开关电容变换器,搭建了24 V DC-12 V DC、100 W的实验样机,实现了99.07%的峰值效率,验证了理论分析的正确性。
