基于模糊PI控制的LLC谐振变换器研究

提出了一种基于模糊PI控制的复合型全桥LLC谐振变换器拓扑的数字充电机设计方案，通过在其拓扑结构原理 分析的基础上，对变换器参数进行优化设计，采用模糊 PI控制器作为其控制策略，利用MATLAB/Simulink仿真软件验证了所设计的电路和控制器的可行性。最后，设计了一台15ｋＷ的实验样机进行实验验证，实验表明，变换器动态响应较为迅速和跟随性较好，输出电压和输出电流的精度和抗干扰性符合要求，满载效率达到95％，各项指标符合充电机的充电要求。     

基于交错Boost变流器和LLC谐振变流器的高效率车载充电机

载充电机(OBC)是电动汽车(EV)的关键部分,为EV提供充电通道。OBC的前级AC/DC电路采用交错Boost电路进行功率因数校正、控制直流母线电压。后级DC/DC采用隔离型全桥LLC电路对充电电压和充电功率进行控制。对交错Boost变流器的效率进行计算,并对LLC谐振变流器的效率进行优化。开发一台3.3 kW OBC样机,其整机效率高达94.9%,功率因数超过99.5%。交错Boost变流器和LLC谐振变流器的效率分别达到97.7%和97.6%,OBC的功率密度可达1.05 kW/L。     

一种单相三电平高功率因数PWM整流器的研究与仿真

介绍了一种新型单相三电平高功率因数PWM整流器电路拓扑,详细分析了该电路的工作状态,推导了其数学模型。采用预测电流控制和逻辑开关状态控制作为其控制策略,经计算机仿真结果表明,该整流器能够维持直流侧输出电压稳定,并可实现高功率因数运行。     

基于平均电流的功率因数校正电路设计与仿真

为了减少车载充电机功率因数校正电路对公共电网的谐波污染,并保证其向后级电路传送稳定的直流电压,设计了一种以UC3854芯片为核心,采用双闭环控制策略的功率因数校正电路。电流内环控制PWM信号,实现Boost电路输入电压与输入电流的相位相同,电压外环控制实现输出电压的稳定。通过建立功率电路的数学模型,根据传递函数的特点设置了电流内环、电压外环补偿网络的参数。最后通过仿真验证了所有设计参数的正确性,实现了低谐波、低污染和高功率因数的目标。     

基于dsPIC33E的电动汽车充电机的研究与设计

本文设计了一种适合于混合动力汽车充电的充电系统,输入为单相交流市电,采用AC/DC和DC/DC相结合的拓扑结构以满足相应的国家标准和充电机的功能需求,利用低成本控制器dsPIC33E进行控制。在对上述主电路拓扑的工作原理进行分析的基础上,给出了部分关键参数的设计方法,并分别设计了前后级电路的控制策略。为了防止在后级DC/DC电路输出模式切换时引起振荡而设计了一种切换方法。最后在理论分析的基础上进行了仿真和实验研究,仿真和实验结果验证了本文所设计的充电机的可行性。     

一种基于三电平的单级PFC电路设计

通过在多电平变换技术和功率因数校正技术两者之间寻找一个应用的契合点,给出了一种零电压开关三电平单级功率因数校正电路拓扑的设计方法。该方法中的变换器由boost功率因数调节器和三电平谐振变换器组成。其中变换器控制方式由两个控制环路实现,输出电压通过控制直流变换器开关频率来进行调节;直流母线电压则通过控制boost调节器的占空比来调节。仿真分析表明,运用该拓扑的变换器的功率因数较高;并可在宽负载变化情况下提供可调节的输出电压以及一个稳定的直流母线电压。     

基于单周期控制的高功率因数整流器仿真

为了提高电压型PWM整流器(VSR)的功率因数,减少网侧电流谐波含量,对采用单周期控制的整流器进行了研究.与传统的控制方法相比,单周期控制OCC(One-Cycle Control)技术是一种不需要乘法器的新颖功率因数校正PFC(Power Factor Correction)控制方法.阐述了三相电压型PWM整流器的拓扑结构、工作原理及控制策略,并利用saber软件进行了仿真.仿真结果表明,采用单周期控制的整流器能够实现单位功率因数.     

升降压PFC车载充电机的研究

传统车载充电机没有考虑电池过放的情况,对过放电池充电时存在电流过大的问题。文中提出了一种具有功率因数校正功能,工作在降压和升压模式的PFC拓扑结构。仿真和实验结果表明,将此拓扑结构应用在车载充电机是合理可行的。     

基于SVPWM的航空高功率因数整流器设计

为了消除电网谐波污染、提高整流器的功率因数,对具有输出电压稳定、能够获得单位功率因数特点的三相电压型PWM整流器的控制策略进行了研究.介绍了空间矢量PWM(SVPWM)控制技术,并将该技术应用于航空整流器的设计;完成数字控制电路中网侧电压调理电路和直流侧输出电压调理电路以及相关软件的设计.实验结果表明,采用SVPWM电流控制技术能够使网侧电压与电流同相位,实现单位功率因数整流.     

基于RC滤波融合二次方运算的Boost-PFC变换器研究

为减少开关变换器电流谐波对电网的污染,降低变换器输出电压超调,提高变换器的稳定性,以单相Boost型拓扑结构功率因数校正（PFC）变换器为研究对象,对变换器原理及其工作模态等效电路进行分析。基于平均电流控制方式,提出一种RC滤波融合二次方运算的输入电压采样方案,在输入电压采样支路增加一个RC滤波电路和一个二次方运算电路,更精确地对输入电压进行采样,从而减少变换器电流谐波、提高变换器稳定性。在Matlab/Simulink软件中搭建仿真电路,同时设计了实验样机进行验证。结果表明,与传统功率因数校正电路相比,该方案有效减少了变换器电流谐波,抑制了变换器输出电压尖峰,同时提高了变换器的输出稳定性。     

基于PWM整流器的高效电动汽车充电机设计

介绍一种用于电动汽车电池充电机的设计实现方法.为满足高功率因数和高效的要求,采用三相PWM整流器和移相全桥变换器两级变换模式.前者基于空间电压矢量PWM直接功率控制（DPC）,实现单位功率因数;后者基于零电压零电流（ZvZCS）控制,实现高效的电能变换.以该方法设计的8 kW的充电机在大部分充电过程中,效率高于84％,输入功率因数高于99.3％.     

一种充电设备整流电路新型控制策略的研究

在此将三相PWM整流电路应用于充电设备主电路,以达到充电设备输出长期稳定、可靠性好、输出纹波小、传递效率高的要求。在整流器控制策略上采用基于电压定向的的矢量控制,对电压定向原则进行了分析,并推导了dq轴电流解耦方式。仿真结果表明采用该方案整流器能快速跟踪给定,具有直接电流控制的动态响应快、稳态性能好的特点。由于采用了网侧电流闭环控制也使网侧电流变化对系统参数不敏感,从而增强了电流控制系统的鲁棒性。     

单相可逆PWM整流器能量双向传输的研究

高功率因数电能交换和负载电能回馈电网的实现是电力节能的关键问题.在对电压型单相PWM(Pulse-width Modulation)整流器的拓扑结构以及其工作原理的分析基础上,提出了相应的控制方法并分别对主电路参数和PI调节器参数进行了选择和设计.基于Matlab计算机仿真软件对整个单相PWM整流器控制系统进行了建模和仿真,结果表明PWM整流器控制系统能很好实现高功率因数电能变换和电能的双向流动.     

基于ATMEGA16的开关电源设计与制作

电源广泛应用于各种电子设备及电子电路中。以ATMEGA16单片机为控制核心,设计并制作了具有输出电压步进可调的开关电源。其硬件由整流、滤波、单片机供电电源、DC-DC变换及LED显示组成。经实验测定,输出电压0～9.9V步进0.1V可调,输出电流1.5A,当输出电压9V、输出电流1.5 A时,电压调整率小于0.67%,效率可达78.78%。     

Nonconventional on-board charger for electric vehicle propulsionbatteries

Electric vehicles (EVs) are needed in densely populated urban areas to reduce air pollution. Battery chargers are needed to supply DC voltage to charge the high-energy battery parks used in EVs. This paper deals with an on-board battery charger arrangement that is fully based on the use of the power components of the EV motor drive. Desired features for EV battery chargers such as minimum volume, low cost, high efficiency, and high reliability are fully matched by means of the proposed solution. The proposed on-board charger arrangement has been installed on an electric scooter prototype being developed for the Far East markets. Design analysis and experimental results of the on-board charger prototype are presented     

Dual-bridge LLC-SRC with extended voltage range for deeply depleted PEV battery charging

This paper proposes a dual-bridge LLC series resonant converter with hybrid-rectifier for achieving extended charging voltage range of 50–420 V for on-board battery charger of plug-in electric vehicle for normal and deeply depleted battery charging. Depending upon the configuration of primary switching network and secondary rectifier, the proposed topology has three operating modes as half-bridge with bridge rectifier (HBBR), full-bridge with bridge rectifier (FBBR) and full-bridge with voltage doubler (FBVD). HBBR, FBBR and FBVD operating modes of converter achieve 50–125, 125–250 and 250–420 V voltage ranges, respectively. For voltage above 62 V, the converter operates below resonance frequency zero voltage switching region with narrow switching frequency range for soft commutation of secondary diodes and low turn-off current of MOSFETs to reduce switching losses. The proposed converter is simulated using MATLAB Simulink and a 1.5 kW laboratory prototype is also built to validate the operation of proposed topology. Simulation and experimental results show that the converter meets all the charging requirements for deeply depleted to fully charged battery using constant current-constant voltage charging method with fixed 400 V DC input and achieves 96.22% peak efficiency.     

Analysis,design and implementation of an interleaved three-level PWM DC/DC ZVS converter

This paper presents a new parallel three-level soft switching pulse-width modulation (PWM) converter. The proposed converter has two circuit cells operated by the interleaved PWM modulation. Thus, the ripple currents at input and output sides are reduced. Each circuit cell has two three-level zero voltage switching circuits sharing the same power switches. Therefore, the current and power rating of the secondary side components are reduced. Current double rectifier topology is selected on the secondary side to decrease output ripple current. The main advantages of the proposed converter are soft switching of power switches, low ripple current on the output side and low-voltage rating of power switches for medium-power applications. Finally, the performance of the proposed converter is verified by experiments with 1 kW prototype circuit.     

High-Performance Transformerless Online UPS

In this paper, a high-performance single-phase transformerless online uninterruptible power supply (UPS) is proposed. The proposed UPS is composed of a four-leg-type converter, which operates as a rectifier, a battery charger/discharger, and an inverter. The rectifier has the capability of power-factor collection and regulates a constant dc-link voltage. The battery charger/discharger eliminates the need for the transformer and the increase of the number of battery and supplies the power demanded by the load to the dc-link capacitor in the event of the input-power failure or abrupt decrease of the input voltage. The inverter provides a regulated sinusoidal output voltage to the load and limits the output current under an impulsive load. The control of the dc-link voltage enhances the transient response of the output voltage and the utilization of the input power. By utilizing the battery charger/discharger, the overall efficiency of the system is improved, and the size, weight, and cost of the system are significantly reduced. Experimental results obtained with a 3-kVA prototype show a normal efficiency of over 95.6% and an input power factor of over 99.7%.      

Practical Control Implementation of a Three- to Single-Phase Online UPS

A high-performance three- to single-phase online uninterruptible power supply (UPS) is proposed. The proposed UPS is composed of a rectifier, a battery charger/discharger, and an inverter. The rectifier has the capability of power-factor correction and regulates a dc-link voltage. When the rectifier becomes unavailable or when the current required by the load exceeds the output rating of the rectifier, the charger/discharger supplies the power demanded by the load to a dc-link capacitor. The inverter provides a regulated sinusoidal output voltage and limits an output current under an impulsive load. New control algorithms of the rectifier, the charger/discharger, and the inverter are proposed. The proposed algorithms of the rectifier and the charger/discharger improve dynamic performance at step load change. To improve the transient response of the output voltage at outage of an input source, a mode change method of the charger/discharger is also proposed. Additionally, the proposed current-limit algorithm of the inverter can be implemented without additional hardware, and it increases the reliability of the UPS.      

PWM型DC-DC LED驱动电路的研究与设计

采用PWM型DC-DC降压拓扑电路结构和闭环恒流控制,设计了LED驱动电路,其工作在CCM模式。该LED驱动电路选用LM2575作为PWM控制芯片,并制作了该电路的实际电路板,其外围元件较少,电路结构简单,适用于中小型LED负载驱动。通过理论分析得到电路元件和各个节点的性能参数,并应用Simulink对DC-DC降压拓扑电路进行仿真。经调试与测量表明,该电路的电气性能良好,负载输出电压纹波在±0.1%以内,功率效率达到45.5%。