单相APFC在变频器中的应用

虽然变频技术的应用十分广泛,但目前市场上的变频器大部分不带APFC电路.随着各种限制谐波污染的强制规范陆续出台,在变频器中加入APFC电路将成为一种趋势.介绍了有无APFC电路时单相变频器工作情况的异同.通过对比实验证明加入简单的APFC电路后会很好地改善变频器的工作性能,不仅减少了对电网的谐波污染也使得变频器自身的工作特性得以改善.     

Performance Verification of High‐Efficiency PV Power Conditioner Integrated with SiC MOSFETs and Cooperative Control Method

A high conversion efficiency is always required for photovoltaic power conditioners to utilize PV‐generated DC power with minimal loss. The cooperative control method has been developed as one of the control methods that improves the conversion efficiency, which is applicable to nonisolated power conditioners consisting of a boost converter and an inverter. In the cooperative control method, the boost converter creates part of the AC voltage waveform, and either the boost converter or inverter performs switching only during a required period. Therefore, it has the advantage of reducing switching losses. In this paper, we present a study of a cooperative‐control‐type power conditioner assuming its use in grid‐connected operation and the results of a performance verification of prototype power conditioner. A microcontroller is used for cooperative control. The experimental results show that the prototype power conditioner integrated with SiC MOSFETs and the cooperative control method achieves an efficiency of 97.4% at an output of 5.5 kW.     

应用TOPSwitch器件设计功率因数校正电源

讨论了在Boost功率变换电路中进行功率因数校正的方法,并介绍了如何使用TOPSwitch器件来设计低成本的功率因数校正电源。     

基于DSP双管并联升压斩波电路设计

介绍了一种适合大功率的并联升压斩波电路结构以及该电路的原理与工作特性,分析了基于DSP芯片的升压型电路,设计了硬件电路以及编写软件程序。该方案电路简单,可靠性高,转换效率高,经过实验测试,验证了该电路的优点和工程应用价值。     

线性功率MOSFET分析及应用

本文分析了线性功率MOSFET的结构及其性能,并对其在线性模式下的应用进行了介绍。     

同步整流降压变换器功率损耗分析与研究

损耗分析对电路的优化设计起着至关重要的作用。对同步整流降压(BUCK)变换器中的各个元器件做了损耗分析和计算。给出了各元器件的损耗原因和计算方法,并以ADP1828芯片控制的BUCK电路对计算方法进行了效率验证。实际测得的效率曲线与计算得出的效率曲线结果较为接近。     

基于单周期控制的Boost-PFC变换器的研究

论述了单周期控制技术的基本原理,应用单周期控制芯片IR1150制作了一台原理样机,并进行了实验论证。实验结果证明,单周期控制BoostPFC变换器具有功率因数高、效率高、结构简单、工作稳定等优点。     

一种单位功率因数单相AC/DC变换器的研究

根据传统升压式AC/DC变换器的功率因数校正原理,讨论了两种升压电感置于整流桥前的单相AC/DC变换器,在对其进行仿真分析之后认为,它们的控制原理可以保持不变,其控制电路也可通过适当改进传统单相AC/DC变换器的控制电路而得到,而且因结构紧凑而便于功率集成。最后给予了物理实现,功率达到2kW以上,仿真结果与实验结果验证了理论分析的正确性。     

功率场效应晶体管MOSFET（一）

本文阐述了MOSFET的结构、工作原理，静态、动态特性，并论述了动态特性的改进，对MOSFET的驱动电路及其发展动态作了简单介绍。分析了功率MOSFET的几种驱动电路的技术特性和功率损耗，介绍了新一代MOSFET——QFET的主要技术特性、MOSFET器件的发展趋势和研发动态及在变换器领域应用的优势。     

低反向恢复损耗的无桥升压变换器

介绍了采用耦合电感和两个二极管与输出端并联的无桥变换器电路,分析了该电路的工作模式。针对抑制二极管的反向恢复问题,提出了相应的设计向导,并通过仿真软件验证测试该电路。结果表明,电路在保持高功率因素前提下提高了传输效率,扩大了无桥变换器的应用场合。     

Integration of a Photovoltaic Panel with an Electric City Car

Abstract—Autonomy of light electric vehicles with limited mobility can be improved by assisting onboard energy sources, such as battery and ultra-capacitors, by solar energy. This article discusses the integration of a photovoltaic panel with an electric city car. The Photovoltaic Geographical Information Systems of Joint Research Center, Europe, is used for estimating the solar irradiance. Based on the estimations, a DC-to-DC boost converter topology is considered to interface the panel with the DC bus of the electric car. Experimental evaluation of the performance is carried out under a real climatic situation. An analytical loss model is used to comment on the associated losses and to explain the measured changes in gain and efficiency under varying irradiance. Acceptable extension in the autonomy of the electric city car is predicted from the results.     

High-Voltage DC-DC Converter Topology for PV Energy Utilization—Investigation and Implementation

This paper exploited the utilization of photovoltaic (PV) energy system with high-voltage (HV) output DC-DC converter. Classical boost converters are used for both renewable energy integration and HV applications, but limited by reducing output/efficiency in performance. Moreover, as parasitic elements suppress the power transfer ratio, converter needs to maximize the PV energy utilization. This investigation study focused to include additional parasitic elements (voltage-lift technique) to a standard DC-DC buck converter and to overcome all the above drawbacks to maximize the PV power generation. The proposed power circuitry substantially improves the output power gain transfer ratio and a prototype hardware module is implemented using industrial standard DSP TMS 320F2812. Numerical simulation development followed by an experimental prototype implementation is carried out in this investigation. A set of numerical and experimental results is provided in this paper, which show close conformity with the theoretical background.     

一种低输入电压开关电源的设计

介绍了一个输入电压较低、采用推挽拓扑开关电源的设计,给出了主变压器的设计过程和功率开关MOSFET及输出整流二极管的选择方法。     

Boost变换器带恒功率负载状态反馈精确线性化与最优跟踪控制技术研究

分析了Boost变换器带恒功率负载的特性,推导出系统传递函数并得到系统稳定运行条件。采用状态反馈精确线性化技术对系统进行控制。根据Boost变换器带恒功率负载的特点,将最优跟踪技术应用于精确线性化控制中,得到系统非线性控制律。用SABER软件对得到的控制律进行了仿真。仿真结果表明：精确反馈线性化结合最优跟踪可以对Boost变换器带恒功率负载系统进行有效的控制,使系统具有理想的稳态特性和动态响应,在电源及负载大范围变化时,保证系统的稳定运行,满足不同类型负载的要求,具有大信号稳定特性。     

基于单周期控制的一种双向开关型无桥PFC研究

传统的升压型有源功率因数校正(APFC)电路的导通器件多,通态损耗较大,在功率较大和低压输入时的应用场合,其通态损耗影响整机效率的提升.无整流桥的PFC电路成为当今研究热点.文章分析比较了现有无桥PFC电路,并采用一种新型的无桥升压型APFC电路,其导通器件少,电压应力低,开关损耗小,在中大功率场合可得更高效率.文中介...     

基于单周期控制的一种双向开关型无桥PFC研究

传统的升压型有源功率因数校正（APFC）电路的导通器件多,通态损耗较大,在功率较大和低压输入时的应用场合,其通态损耗影响整机效率的提升。无整流桥的PFC电路成为当今研究热点。分析比较了现有无桥PFC电路,并采用一种新型的无桥升压型APFC电路,其导通器件少,电压应力低,开关损耗小,在中大功率场合可得更高效率。介绍了单周期控制的基本原理,并以IR1150S为控制芯片,设计了双向开关型无桥升压PFC电路,300W的试验样机证实了该电路的优越性。     

滑模控制在PV扰动法最大功率跟踪中的应用

在两级式光伏并网发电系统中,前级Boost变换器实现太阳能发电系统最大功率点跟踪控制。研究了一种基于滑模控制的最大功率点跟踪策略。实验结果证明,该系统具有优良的动态和稳态性能,能够快速、准确地跟踪太阳能电池的最大功率点,使太阳能发电系统以最大功率输出能量。