一种基于TVS管的车载逆变电源设计

针对车载逆变电源在充电过程中可能会发生的瞬变过电压现象,设计了一款基于TVS的小型车载逆变电源。该逆变电源前级采用DC-DC推挽正激电路将12 V直流小电压升压为360 V左右的直流高压,后级采用DC-AC全桥逆变电路将输入的直流高压逆变为220 V/50 Hz正弦交流电压。整个电路由主电路、控制电路、检测电路、辅助电路组成。介绍了车载逆变电源的工作原理,研究了TVS管结合推挽正激电路在抑制浪涌现象发挥的作用,提出了使用TVS管结合该逆变器进行保护的方案。同时,利用saber仿真软件对输出电压进行仿真和比较,并搭载了实验模型进行验证,对车载逆变电源实施了有效的保护。     

车载逆变电源逆变器设计中PIC单片机的应用分析

目前，我国的汽车电器市场十分火热，大功率车载逆变器的设计受到了人们的关注。本文笔者结合实验研究，重点分析了车载逆变电源逆变器设计中PIC单片机的应用，具体如下。     

基于重复控制和无差拍控制的逆变电源数字控制技术研究

随着DSP技术的发展，数字控制在逆变电源控制领域的应用受到人们的关注。逆变电源中因非线性负载等因素引起的干扰具有周期性，而这些干扰导致输出波形的畸变具有重复性，采用重复控制策略可以消除输出电压谐波，但该控制方法的动态响应慢。无差拍控制具有瞬时响应快，精度高等特点。文中将重复控制和无差拍控制相结合用于逆变电源数字控制系统中，得到更为完善的逆变电源控制策略。仿真结果表明，由该方法设计的控制器用于逆变电源系统具有输出波形好，动态响应快，适应负载的能力强等优点。     

一种实用车载逆变器的设计

介绍了一种以SG3525A为主控芯片的车载逆变器的设计,该逆变电源工作效率高、实用、可靠.     

两种双环控制方式对并联逆变器的影响

电压电流双环控制策略对单相逆变电源有一定的优越性,不同的采样电流方式对逆变电源输出电压外特性有着不同的影响。在控制参数一致的情况下进行对比分析,电感电流反馈方式对其输出电压外特性的影响较大,对并联逆变电源的环流影响较小;电容电流反馈对输出电压外特性的影响较小,对并联逆变电源的环流影响较小,所以文中并联系统采用电容电流反馈方式作为内环调节;通过MATLAB软件中的simulink工具验证了理论的正确性。     

基于重复控制的逆变电源输出稳态误差分析

针对逆变电源带非线性负载时产生的严重周期性波形畸变，文章基于重复控制提出一种控制方案，该方案通过系统关键参数的合理设置，能够有效地减小系统的输出稳态误差，明显改善输出波形的质量。     

基于dsPIC单片机的单相逆变电源的设计

本文介绍的是一个PI控制单相逆变电源的设计过程。根据单相电压型逆变器电路模型,建立了逆变器开环系统的传递函数,利用dsPIC单片机设计了一个单相逆变电源。逆变电源的仿真和实验结果表明:增加了电压有效值反馈闭环后,逆变器对输出电压的控制能力明显提高。     

基于TMS320F2812的逆变电源控制器的设计与研究

随着用电设备对高品质的电源和电能质量的需求日益增多,高性能逆变电源的研究越来越受到关注。首先介绍了逆变电源技术的发展现状,在介绍了TMS320F2812芯片的特性之后,详细分析了基于TMS320F2812逆变电源控制器的硬件和软件设计,并对仿真结果进行分析总结。结果表明,该逆变电源能够得到稳定的正弦波输出。     

一种基于电压瞬时值反馈的数字化逆变电源的研究

介绍一种基于数字PID控制算法的电压瞬时值反馈逆变电源，分析了其控制算法及控制框图，仿真表明该系统具有良好的输出响应特性。     

车载逆变电源的Saber与Simulink联合仿真

在此运用软件Saber和Matlab／Simulink对车栽逆变电源系统进行了联合仿真,得到具有闭环控制功能的车载逆变电源系统的实时仿真结果。通过仿真结果表明利用Saber和Matlab／Simulink软件的联合仿真,可以实现精确的器件模型,搭建控制系统更方便,保证了系统仿真的收敛性,简化了系统仿真的难度,缩短了仿真时间。     

基于单片机的小功率逆变器的设计与实现

为了提高逆变器的整体性能,以STC12C5A60S单片机为核心,设计并实现了一个小功率逆变器。通过单片机直接产生脉宽调制波,控制功率开关器件组成的桥电路实现逆变。根据单片机对外部电位器上电压的采样值对输出电压的幅值进行控制,使得输出电压幅度可调。采用数/模电路结合设计,使得逆变器的体积大大减小。硬件上的功能模块化设计,使整个系统的检测性和操控性大大加强。该逆变器电路简单,工作稳定可靠,且易于升级,具有较大的推广应用价值。     

基于DSP的风力发电逆变电源的研究

风电是一种清洁、经济、充足、安全的能源,它的提出不仅解决了我国能源和环境的问题,同时也符合我国可持续发展战略的需要。基于DSP的风力发电逆变电源是专门为用于风力发电设计的,它针对风力的不稳定性以及风力发电环境的特殊性,加入了各种保护电路以及反馈电路,最后经过逆变电路和整流滤波电路输出用于民用的稳定电压。介绍了主控芯片TMS320I,F2407的特点,给出了系统设计的软硬件结构,并通过试验验证了系统的可行性。     

基于PLC与变频器的交流电机调速系统的探究

变频器是利用电力半导体器件的通断作用将电压和频率不变的工频交流电源转化成电压和频率可调的交流电源,供给交流电动机实现软启动、变频调速等功能的电能变换控制装置。变频器交流调速系统具有良好的调速性能,而且运行效率高、可靠性强、节能效果也较为理想,是全球范围内公认较为先进的调速系统。而PLC是一种程序系统,把二者结合在一起,可实现变频器交流电机调速控制系统的自动化、科技化、智能化的控制。本文将设计探究基于PLC的变频器多段速控制,通过总体方案确定功能要求,选择软硬件,完成输入输出分配及接线端子的连接,最后通过变频器的参数设定和PLC的程序设计完成交流电机多段速控制的操作。     

A series-resonant DC/AC inverter for impedance-load drives

A DC/AC inverter without cycloconversion configured by a half-bridge series-resonant inversion (HB-SRI) circuit is presented. The inverter is a series resonator with two auxiliary switches in shunt with the resonant capacitor so as to configure adaptively the output current suitable for impedance load. The output sinusoidal voltage is synthesized by a series of equal-amplitude quasisinusoidal pulses (QSPs) and the corresponding current is formed by unequal QSPs and adaptively phase-shifts to the impedance load. The presented HB-SRI is operated by frequency modulation with a constant-on time control. System modeling and waveform syntheses for the output sinusoidal voltage and its current are clearly derived, A typical design example of a 500 W HB-SRI inverter is examined to assess the system performance. The power efficiency is over 90% when the inverter output is above 200 W. The total harmonic distortions (THDs) for various impedance loads are all within 6%     

Design method of single-phase inverters for UPS systems

This article presents the complete design of a low power voltage source inverter (VSI) dedicated for a UPS system. The analysis of the rectangular PWM-AC voltage spectrum allows for a choice of the basic architecture of the inverter. Output filter parameters were calculated to reduce the maximum amplitude of the output VSI voltage harmonics for the steady-state inverter mode. The choice of the feedback loop type was based on a discussion of the inverter output impedance using a continuous model of the inverter. The parameters of the inner loop digital control for the discrete inverter model were calculated using the Coefficient Diagram Method. The influence of the step load was modelled. The time constant of the inverter closed loop system was selected to ensure sufficient system robustness. An outer feedback loop with a plug-in repetitive controller, simplified owing to the properties of the PID/CDM inner loop control, was introduced to eliminate the periodic disturbances generated by the non-linear rectifier load and the deadtime influence. The experimental verification of the design method is presented.     

永磁同步电机矢量控制中死区补偿技术的研究

本文针对永磁同步电机矢量控制系统,分析了死区电压矢量对三相输出电压的影响以及死区电压矢量与定子电流方向的关系,提出了一种基于SVPWM矢量控制的死区补偿方法。定子电流矢量角根据计算得出,避免了传统方法在相电流过零处由于电流方向检测不准而影响补偿效果。该方案无需增加硬件电路,对软件进行修改即可实现。仿真试验结果证实了该方法的有效性。     

Nonlinear-controlled strategy for soft-switched series-resonant DC/AC inverter without auxiliary switches

A nonlinear control for soft-switched series-resonant DC/AC inverter without auxiliary switches is presented. The inverter is configured by a full-bridge series-resonant inversion (FB-SRI) without cycloconversion and auxiliary switches. The inverter is a series resonator with four main switches to configure adaptively the output current suitable for impedance load. The output sinusoidal voltage is synthesized by a series of equal-amplitude quasisinusoidal pulses (QSPs) and the corresponding current is formed by unequal QSPs and adaptively phase-shifts to the impedance load. The nonlinear control strategy is designed against the input DC perturbation and achieves good dynamic regulation. The presented FB-SRI is operated by frequency modulation with a constant-on time control. Waveform syntheses for the output sinusoidal voltage and its current are clearly derived. A typical design example of a 500W FB-SRI inverter is examined to assess the system performance. The power efficiency is over 90% when the inverter output is above 200 W. The total harmonic distortions (THDs) for various impedance loads are all within 6%.     

A novel space-vector current regulation scheme for afield-oriented-controlled induction motor drive

The system performance of an AC variable-speed drive directly depends on the current regulation. In this paper, a novel space-vector current regulation scheme for a field-oriented controller (FOC) is developed. Motor currents are regulated by generating appropriate inverter output voltage vectors via software-implemented comparators and a switching table. A switching table based on the angular coordinate enables the inverter to generate optimal voltage vectors. By introducing an additional triangular carrier signal to the output of original hysteresis comparators, a user-selectable high and fixed switching frequency can be obtained, further improving the driver performance. Experiments are made to verify the effectiveness and correctness of this proposed method. According to the experimental results, both simple hardware design and good current response can be attained     

An accurate approach of nonlinearity compensation for VSI inverter output voltage

An accurate nonlinearity compensation technique for voltage source inverter (VSI) inverters is presented in this paper. Because of the nonlinearity introduced by the dead time, turn-on/off delay, snubber circuit and voltage drop across power devices, the output voltage of VSI inverters is distorted seriously in the low output voltage region. This distortion influences the output torque of IM motors for constant V/f drives. The nonlinearity of the inverter also causes 5th and 7th harmonic distortion in the line current when the distributed energy system operates in the grid-connected mode, i.e., when the distributed energy system is parallel to a large power system through the VSI inverter. Therefore, the exact compensation of this nonlinearity in the VSI inverter over the entire range of output voltage is desirable. In this paper, the nonlinearity of VSI inverter output voltage and the harmonic distortion in the line current are analyzed based on an open-loop system and a L-R load. By minimizing the harmonic component of the current in a d-axis and q-axis synchronous rotating reference frame, the exact compensation factor was obtained. Simulations and experimental results in the low frequency and low output voltage region are presented.