In this paper,a novel pulse density modulation(PDM)with semi-bridgeless active rectifier(S-BAR)in inductive power transfer(IPT)system for rail vehicle is proposed.It is to reduce switching losses of the active rectifi...In this paper,a novel pulse density modulation(PDM)with semi-bridgeless active rectifier(S-BAR)in inductive power transfer(IPT)system for rail vehicle is proposed.It is to reduce switching losses of the active rectifier in pickups.In the control method,the insulated-gate bipolar transistors(IGBTs)in the S-BAR are controlled by synchronous PDM signals,so that zero-voltage switching(ZVS)and zero-current switching(ZCS)can be achieved in the whole output power range.The output power is regulated by changing the pulse density(PD)of the S-BAR since the it is almost linear proportional with the PD in high quality factor of pickup side.The communication device between the primary side and pickup side is not necessary anymore.The detailed theoretical analyses of the PDM method are provided,and its advantages are shown in a 7.5kW IPT prototype for rail vehicle.The experimental results are presented to verify the analysis and demonstrate the performance.The overall efficiency of the system by PDM control is 74.2%which is improved by 4%compared with phase shift(PS)control at light load.展开更多
为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采...为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采用二阶Σ-Δ调制与噪声整形生成PDM码流,经全桥功率放大与优化的电感-电容(Inductance Capacitance,LC)滤波器驱动射频末级。引入双反馈闭环控制、时序对齐与预失真补偿提升包络精度,并在保护与监测层设置多种快速响应机制。验证结果表明,该系统能够在不同工况下保持高效、稳定的运行状态,具备较高的工程适配性与推广价值。展开更多
研究了基于脉冲密度调制(Pulse Density Modulation)控制策略的串联谐振逆变电晕处理电源。PDM的基本思想是在一定的调功周期内使交流输出端产生方波电压或者是零电平电压,这样即使电晕放电负载具有很强的非线性也可以宽范围内控制功率...研究了基于脉冲密度调制(Pulse Density Modulation)控制策略的串联谐振逆变电晕处理电源。PDM的基本思想是在一定的调功周期内使交流输出端产生方波电压或者是零电平电压,这样即使电晕放电负载具有很强的非线性也可以宽范围内控制功率输出。对于该电晕处理电源进行了仿真与实验,所得结果验证了理论分析。展开更多
文摘In this paper,a novel pulse density modulation(PDM)with semi-bridgeless active rectifier(S-BAR)in inductive power transfer(IPT)system for rail vehicle is proposed.It is to reduce switching losses of the active rectifier in pickups.In the control method,the insulated-gate bipolar transistors(IGBTs)in the S-BAR are controlled by synchronous PDM signals,so that zero-voltage switching(ZVS)and zero-current switching(ZCS)can be achieved in the whole output power range.The output power is regulated by changing the pulse density(PD)of the S-BAR since the it is almost linear proportional with the PD in high quality factor of pickup side.The communication device between the primary side and pickup side is not necessary anymore.The detailed theoretical analyses of the PDM method are provided,and its advantages are shown in a 7.5kW IPT prototype for rail vehicle.The experimental results are presented to verify the analysis and demonstrate the performance.The overall efficiency of the system by PDM control is 74.2%which is improved by 4%compared with phase shift(PS)control at light load.
文摘为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采用二阶Σ-Δ调制与噪声整形生成PDM码流,经全桥功率放大与优化的电感-电容(Inductance Capacitance,LC)滤波器驱动射频末级。引入双反馈闭环控制、时序对齐与预失真补偿提升包络精度,并在保护与监测层设置多种快速响应机制。验证结果表明,该系统能够在不同工况下保持高效、稳定的运行状态,具备较高的工程适配性与推广价值。
文摘研究了基于脉冲密度调制(Pulse Density Modulation)控制策略的串联谐振逆变电晕处理电源。PDM的基本思想是在一定的调功周期内使交流输出端产生方波电压或者是零电平电压,这样即使电晕放电负载具有很强的非线性也可以宽范围内控制功率输出。对于该电晕处理电源进行了仿真与实验,所得结果验证了理论分析。
