A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a...A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee point of the primary auxiliary winding voltage. Furthermore, an internal digital compensator eliminates the need for external loop compensation components while achieving excellent line and load regulation. The controller could output both constant voltage and constant current depending on the load current. Pulse width modulation and pulse frequency modulation are used in constant voltage mode while quasi-resonant control is used in constant current mode. The digital controller is validated by using FPGA.展开更多
某电厂安萨尔多AE94.3A燃气-蒸汽联合循环调峰机组,在投入商业运行初期,运行人员在机组启停过程中有过多次误操作,导致机组跳闸。在原有集散控制系统(DCS)的基础上进行了自动启停(automatic procedure startup and shutdown,APS)技术升...某电厂安萨尔多AE94.3A燃气-蒸汽联合循环调峰机组,在投入商业运行初期,运行人员在机组启停过程中有过多次误操作,导致机组跳闸。在原有集散控制系统(DCS)的基础上进行了自动启停(automatic procedure startup and shutdown,APS)技术升级改造,从而降低了运行人员的工作强度,减少误操作,对机组长期的安全稳定运行有重大意义。本文围绕某电厂安萨尔多AE94.3A联合循环机组自动启停技术项目的实施,介绍了自动启停技术整体设计框架,并对各功能断点进行了分层解析,最终对项目碰到的难点进行分析,提出了解决方案。展开更多
分析了50kVA并联有源电力滤波器(Shunt Active Power Filter,简称SAPF)基于同步坐标变换的直流侧电压控制模型,并基于控制模型设计出直流侧电压环的PI调节器。为了避免启动时直流侧电压的过冲,采用分3个不同阶段的启动方法完成了直流侧...分析了50kVA并联有源电力滤波器(Shunt Active Power Filter,简称SAPF)基于同步坐标变换的直流侧电压控制模型,并基于控制模型设计出直流侧电压环的PI调节器。为了避免启动时直流侧电压的过冲,采用分3个不同阶段的启动方法完成了直流侧电压的软启动。采用设计的PI调节器来控制SAPF投入运行后的直流侧电压。控制仿真和实验结果均证明了理论分析的正确性和可行性。展开更多
文摘A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee point of the primary auxiliary winding voltage. Furthermore, an internal digital compensator eliminates the need for external loop compensation components while achieving excellent line and load regulation. The controller could output both constant voltage and constant current depending on the load current. Pulse width modulation and pulse frequency modulation are used in constant voltage mode while quasi-resonant control is used in constant current mode. The digital controller is validated by using FPGA.
文摘某电厂安萨尔多AE94.3A燃气-蒸汽联合循环调峰机组,在投入商业运行初期,运行人员在机组启停过程中有过多次误操作,导致机组跳闸。在原有集散控制系统(DCS)的基础上进行了自动启停(automatic procedure startup and shutdown,APS)技术升级改造,从而降低了运行人员的工作强度,减少误操作,对机组长期的安全稳定运行有重大意义。本文围绕某电厂安萨尔多AE94.3A联合循环机组自动启停技术项目的实施,介绍了自动启停技术整体设计框架,并对各功能断点进行了分层解析,最终对项目碰到的难点进行分析,提出了解决方案。
文摘分析了50kVA并联有源电力滤波器(Shunt Active Power Filter,简称SAPF)基于同步坐标变换的直流侧电压控制模型,并基于控制模型设计出直流侧电压环的PI调节器。为了避免启动时直流侧电压的过冲,采用分3个不同阶段的启动方法完成了直流侧电压的软启动。采用设计的PI调节器来控制SAPF投入运行后的直流侧电压。控制仿真和实验结果均证明了理论分析的正确性和可行性。
