针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可...针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。展开更多
不间断电源系统(uninterruptible power supply,UPS)中电池充电器为独立的功能子模块,在工程设计中一般需要独立的电路来实现该部分功能,这将会占用一定的体积与重量,对UPS系统的功率密度与成本造成不利影响。基于现有的功率因数校正(po...不间断电源系统(uninterruptible power supply,UPS)中电池充电器为独立的功能子模块,在工程设计中一般需要独立的电路来实现该部分功能,这将会占用一定的体积与重量,对UPS系统的功率密度与成本造成不利影响。基于现有的功率因数校正(power factor correction,PFC)电路即Dual Boost,具有自充电功能的UPS系统将续流二极管更换为可控的MOSFET。结合Dual Boost正负两部分电路工频半周间隔工作的特点,改变电路的控制方式。即可实现市电到直流母线转换的Boost电路,直流母线到电池转换的Buck电路;在此期间,Buck电感复用Boost电感。整个电路仅在现有电路上作微小改动,将工频半周工作间歇的电路利用起来,实现电池充电功能。从UPS系统评估,该电路完全满足充电器的各项技术指标,与独立的充电模块方案相比无明显差异。搭建6kVA的UPS平台验证该新型电路,实验结果表明,所提出的可自充电UPS功率因数校正电路与理论分析完全一致,各项功能可充分实现,各项性能可完全达标。展开更多
Application of a DFIG （doubly-fed induction generator）, which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supp...Application of a DFIG （doubly-fed induction generator）, which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine eogeneration system. In the case of conventional constant speed of synchronous generator, the amount of the allowed step load is limited to around 30% of the rated power. On the other hand, DFIG is expected to increase the amount of step load during the stand-alone operation. In this paper, it has been demonstrated that an increase in the gas engine speed resulted in an increase in the maximum amount of step load using experimental equipment with a real gas engine. It has been concluded that the proposed system can improve the performance of an emergency power supply at step-loading.展开更多
文摘针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。
文摘Application of a DFIG （doubly-fed induction generator）, which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine eogeneration system. In the case of conventional constant speed of synchronous generator, the amount of the allowed step load is limited to around 30% of the rated power. On the other hand, DFIG is expected to increase the amount of step load during the stand-alone operation. In this paper, it has been demonstrated that an increase in the gas engine speed resulted in an increase in the maximum amount of step load using experimental equipment with a real gas engine. It has been concluded that the proposed system can improve the performance of an emergency power supply at step-loading.
