临界电流模式图腾柱无桥功率因数校正换相谐振抑制  

Suppression of Commutation Resonance for Totem-Pole Bridgeless Power Factor Correction in Critical Current Mode

作　　者：黄帆 任小永[1] 陈乾宏[1] 李梦睿 王生东 Huang Fan;Ren Xiaoyong;Chen Qianhong;Li Mengrui;Wang Shengdong(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China;Luoyang Rosen Technology Limited Liability Company,Luoyang,471000,China;The 55th Research Institute of China Electronics Tech Group Corporation,Nanjing,210096,China)

机构地区：[1]南京航空航天大学自动化学院,南京211106 [2]洛阳隆盛科技有限责任公司,洛阳471000 [3]中国电子科技集团第五十五研究所,南京210096

出　　处：《电工技术学报》2024年第12期3816-3826,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177181)。

摘　　要：工作于临界电流模式下的图腾柱无桥功率因数校正(PFC)电路因其无整流桥损耗、电感体积小、易于实现软开关而得到广泛关注。然而,在输入电压过零点处,工频管之间的换相时刻,电感会与工频管的结电容产生谐振,相应地,电感电流和直流母线电压因此会存在高频振荡。电感电流振荡会加剧输入电流畸变程度,而母线电压上的高频尖峰由于振荡频率高,后级DC-DC变换器难以抑制而传递至负载,导致敏感负载无法正常工作。该文分析线性开关在主动栅极电路中抑制振荡的工作原理,基于线性开关的特性提出三电平驱动方式来抑制图腾柱无桥PFC换相谐振,降低输入电流总谐波畸变率(THD)的同时实现对直流母线的高频尖峰的抑制,在2kW满载工况下,将输入电流THD降低1%,母线电压尖峰高频分量峰值由2.83V减小至0.01 V以下。实验结果表明,该文所提出的三电平驱动方式可以有效抑制临界电流模式图腾柱无桥PFC的换相谐振。Totem-pole bridgeless power factor correction(PFC)circuit operating in critical conduction mode(CRM)has a low on-state loss,easy implementation of soft switching,and high power density.However,at the commutation time between the power frequency switches,the inductance in the circuit can resonate with the bus capacitance and the output junction capacitance of the switches.As a result,a large oscillation peak exists when the input current commutates and the secondary ripple of the bus voltage crosses the zero point.The oscillation of inductance current causes an increase in input current total harmonics distortion(THD).Meanwhile,the oscillation spike superimposed on the bus voltage’s secondary ripple includes high-frequency components directly applied to the load through the subsequent DC-DC converter,causing the sensitive load to work improperly.Therefore,it is necessary to suppress the commutation resonance effectively.Through the analysis of the totem-pole circuit,the greater the impedance of the power frequency switch at its opening moment,the better the suppression effect of the oscillation.This paper proposes a three-level hybrid driving strategy for power frequency switches.Based on the characteristics of the linear switch,the adverse effects of high dv/dt and di/dt in the circuit can be overcome by changing the working mode of traditional driving circuits,increasing the damping of switching instants and optimizing switching trajectories.This strategy is to extend the time of the MOSFET operating in a linear region through a lower intermediate level Vint at the moment when the power frequency switch is turned on.When the voltage of another power frequency switch rises to the bus voltage and the circuit reaches stability,the driving signal reverts to the normal high level.The switching of the intermediate level is achieved through the auxiliary tube Q_(1).The input voltage is close to the zero-crossing point during commutation,and the input current oscillation is suppressed by the proposed control strategy.

关 键 词：图腾柱无桥功率因数校正(PFC) 换相谐振 线性开关 三电平驱动 母线电压尖峰抑制 

分 类 号：TM461[电气工程—电器]