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功率因数校正论文：单周期控制软件开关Boost变换器PFC技术的研究

【中文摘要】开关电源是为用电设备提供直流电源的一种电力电子装置,获得越来越广泛的应用。但由此产生的网侧输入功率因数降低和谐波污染等问题也日趋严重,功率因数校正(Power Factor Correction, PFC>技术可有效地减少网侧输入电流谐波含量并提高电源功率因数,正成为电力电子研究的热点之一。在各种用于PFC变换器的电路拓扑中,Boost变换器因其拓扑结构简单、变换效率高、控制策略易实现等优点,被广泛应用于PFC电路中。Boost PFC变换器基本都是工作于不连续导电模式(Discontinuous Conduction Mode, DCM>和连续导电模式(Continuous Conduction Mode, CCM>。目前,大多采用平均电流控制来达到功率因数校正的,但平均电流控制中需要检测输入电压、电感电流、输出电压,并且使用乘法器来实现,使得系统控制复杂,投资增加。单周期控制技术和软开关技术都是近些年来被提出的用于PFC的新型技术,单周期控制(One Cycle Control, OCC>作为一种新型的控制方式在功率因数校正(Power Factor Correction, PFC>电路中得到广泛地应用。单周期控制是一种新兴的非线性控制技术,与传统线性控制相比,它考虑到了开关非线性的影响,更适合对开关变换器的控制,能使系统有更快的动态响应、更强的鲁棒性和更好的输入波动抑制特性,并且单周控制PFC技术不需要乘法器,无需采样输入电压,简化了控制电路的设计。而软

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开关技术的应用对于降低开关损耗,进而提高开关频率,无疑起到极为重要的作用。本文采用的基于单周期控制的软开关Boost PFC变换器,在深入分析了单周期控制原理的基础上,将无源无损软开关技术应用于Boost PFC变换器中。本文第二章详细介绍了无源无损软开关的工作过程,第三章主要分析了用单周期控制的Boost结构有源功率因数校正电路,推导出单相Boost结构APFC的单周期控制方程,并用基本的电路实现这种控制,和其他的APFC控制电路相比,电路结构大大简化。第四章结合单周期控制芯片IR1150,采用分立元器件搭建了IR1150的主要控制电路,进行了主电路和控制电路的主要参数设计。最后通过Saber仿真验证了本论文设计的单周期控制的Boost APFC电路无论在稳态还是暂态,都能保持受控量的平均值恰好等于或正比于给定值,即能在一个开关周期内有效抵制系统的扰动,具有极快的瞬态响应,能实现很高的功率因数、很低的谐波分量、且控制电路简单。

【英文摘要】Switching power supply is a power electronic devices, which is widely used to provide DC power for the electrical equipment. However, it has the consequences that the lower input power factor and harmonic pollution of the network side is becoming serious. Power Factor Correction (Power Factor Correction, PFC> technology can effectively reduce the input current harmonic content and to improve power factor, so it is becoming the hot

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research in the area of the power electronics. In a variety of circuit topologies. Boost converter topology are widely used in PFC circuits, that is because its simple structure, high conversion efficiency, control strategy easy to implement, etc.Boost PFC converter is usually operating in discontinuous conduction mode (Discontinuous Conduction Mode, DCM> and continuous conduction mode (Continuous Conduction Mode, CCM>. Currently, the average current control is used to achieve the objective of power factor correction, but the average current control needs to detect the input voltage, inductor current and output voltage, and has to use the multiplier, which would make the system control complex and increase the cost of the product.One Cycle Control (OCC> and soft switch technology are two new PFC technologies, which are proposed in recent years. the One Cycle Control as a new control method for power factor correction circuit has been widely applied. Compared with traditional linear control, One Cycle Control is a new nonlinear control technique. It takes into account the impact of non-linear switch, so it is more suitable for the control of switching converters. It also improves the dynamic response and robustness of the system.Without