基于单片机的转差频率控制变频调速实验系统设计

本文针对市场上变频调速实验装置的缺点,通过分析转差频率控制原理,将调速系统合理的模块化,采用单片机AT89C51控制SA8282芯片的方法产生SPWM波形,结合PI调节器构成结构较为简单的闭环控制实验系统,实现转差频率控制变频调速实验.     

变频调速系统在矿井提升中的实现

针对矿用提升机实际应用中所出现的低效,高能耗等诸多问题,提出了使用变频调速技术代替传统控制的必要性。文中首先分析了矿用提升机的基本理论,在此基础上设计了—种全数字式PLC控制的矿用变频调速系统,通过计算比较得出,该变频调速系统较传统转子串电阻调速控制方式具有控制简单易行,实现低能耗,有效提高年产置等特点。     

泵用永磁同步电动机变频调速控制系统设计

为了提高泵用永磁同步电机的工作效率,研制了一种永磁同步电机变频调速控制系统.该系统以80C196MC单片机为控制核心,采用简单的V/F变频控制方法达到较好的控制效果.针对该控制系统的硬件和软件实现进行了论述,并通过实验证明了该控制系统的可行性.     

SCHNEIDER变频调速实验装置的研制及应用

变频器装置在调速性能、智能控制、通讯功能等方面都具有优异的性能.为了使学生更好地掌握变频调速的原理及其通用变频器的应用,采用SCHNEIDER变频器开发了一个变频调速实验装置.文中介绍了该实验装置的基本组成.该实验装置可以实现现代变频调速中的最重要的控制,具有单机和网络通讯两种控制模式.本文同时也阐述了此实验装置在实验教学中的应用.该装置工作可靠、操作方便,很适合用于本科生的变频调速实践教学.     

基于嵌入式以太网的异步电机矢量控制系统体系结构设计

为了实现异步电机现场控制与上层管理的无缝集成，提出在通用变频器一异步电动机调速系统的基础上，采用基于ARM7TDMI核的微控制器和以太网控制芯片，实现异步电机的网络化控制。详细介绍了该系统的体系结构设计方案。     

全数字SPWM信号产生芯片的设计及变频调速应用

针对电力电子领域的需求,设计了新型全数字三相SPWM信号产生芯片。该芯片采用了改进的直接数字频率合成DDS（Direct Digital Frequency Synthesis）算法,以保证芯片的高性能,其输出SPWM信号频率的控制精度为65536级,达到设计要求。为了验证芯片的实用性能,以该芯片为基础设计了变频调速系统的硬件和软件。实验结果表明该系统具有成本低、信号精度高、MCU效率高的特点,系统性能达到应用要求。     

韶冶烟化炉高压变频调速系统

本文介绍了韶冶烟化炉风机采用电压型变颁器构成的高一低一高式高压变频调速系统的结构、功能和特点。实践结果表明，该系统设计合理，具有良好的动静态性能，是一种经济实用的高压变频调速系统。     

基于神经网络的异步电动机直接转矩控制系统

直接转矩控制是继矢量控制变频技术后发展起来的一种新型具有高性能的交流变频调速技术。针对基于直接转矩控制的异步电动机运行时存在较大的电流及转矩脉动问题,提出了利用神经网络构造逆变器的开关状态选择器用于直接转矩控制,摒弃了滞环,系统实现更简单。仿真结果表明,该调速系统具有良好的动态性能,该设计是可行的。     

基于人群搜索算法优化PID的矿井提升机调速系统

针对传统矿井提升机变频调速系统存在的因超调量大、控制精度不高导致的矿井提升机调速效果差的问题,提出一种人群搜索优化PID控制器的方法,相较于传统的PID控制调速系统,该系统具有调节速度快和系统鲁棒性好的特点,解决了传统调速系统存在的问题.     

变频调速在智能建筑中的应用

交流电动机变频调速的应用领域越来越广泛，智能建筑的建设如火如荼的进行。本文论述了变频调速在智能建筑领域中的应用。主要在空调系统、给水系统和电梯系统中的应用。针对风机泵类负载，变频调速能很好地实现节能；而对电梯控制来说，变频调速可以实现安全舒适的搭乘要求。     

Design and implementation of an FPGA-based control IC forAC-voltage regulation

This paper presents a field-programmable gate army (FPGA)-based control integrated circuit (IC) for controlling the pulsewidth modulation (PWM) inverters used in power conditioning systems for AC-voltage regulation. We also propose a multiple-loop control scheme for this PWM inverter control IC to achieve sinusoidal voltage regulation under large load variations. The control scheme is simple in architecture and thus facilitates realization of the proposed digital controller for the PWM inverter using the FPGA-based circuit design approach. Bit-length effect of the digital PWM inverter controller has also been examined in this paper. The designed PWM inverter control IC has been realized using a single FPGA XC4005 from Xilinx Inc., which can be used as a coprocessor with a general-purpose microprocessor in application of AC-voltage regulation. Owing to the high-speed nature of FPGA, the sampling frequency of the constructed IC can be raised up to the range that cannot be reached using a conventional digital controller based merely on microcontrollers or a digital signal processor (DSP). Experimental results show the designed PWM inverter control IC using the proposed control scheme can achieve good voltage regulation against large load variations     

UPS inverter design using discrete-time sliding-mode control scheme

This paper presents a novel discrete-time sliding-mode control algorithm for an uninterruptible power supply (UPS) inverter design. The approach offers a dual-loop design, in which a current predictor utilizes the tracking error of output voltage to estimate the desired inductor current, while a current controller is adopted to regulate the inductor current and, thus, produces a control command to the pulsewidth modulation inverter. An explicit condition for stable controller design is derived. The efficacy of this scheme is validated via a successful implementation on a digital-signal-processor-based UPS inverter. The proposed scheme has shown its robustness on low output voltage distortion, excellent voltage regulation, and it is insensitive to load variation, even under nonlinear loads. Experimental studies were performed to further validate the effectiveness of this scheme     

数字化三相大功率逆变波形内模控制方法

针对三相逆变电源数学模型在旋转αβ坐标系下的特点,提出了基于神经网络内模原理的逆变波形控制方案.用神经网络预估器作为逆变器的内部模型,用神经网络辨识预估逆变器正模型及其逆模型,在线修正、补偿内部模型与被控逆变器之间的模型失配.仿真和实验结果表明,该方案控制下系统稳压精度高,有较快的动态响应.     

A microwave frequency divider using an inverter ring and transmission gates

In this letter, a divide-by-four frequency divider is presented that uses a CMOS inverter ring interspersed with transmission gates. The presence of the transmission gates prevents the inverter ring from oscillating. The signal to be divided is applied to the control voltage to the transmission gates. The integrated circuit operates at an input frequency of 2.2 GHz and yields an output signal at 0.55 GHz. The power dissipation is 14.4 mW. The IC was fabricated using 0.18 /spl mu/m CMOS technology.     

一种新型的基于英飞凌16位微控制器XC164CM的通用变频器方案

本文提出了一种基于英飞凌16位微控制器XC164CM的通用变频器方案,详细介绍了该方案的系统实现并给出了相关测试波形。该方案具有很好的产品实用性。     

基于极点配置的400Hz逆变电源系统设计

针对单相400Hz逆变电源系统的控制特点,引入输出电压瞬时值外环和电感电流内环的双环反馈控制,采用极点配置与PI控制相结合的方法对系统进行了设计,并根据状态空间理论建立了系统数学模型。仿真结果表明,该方案动态响应快、稳态精度高、THD小、带负载能力强。     

Discrete sliding-mode control of a PWM inverter for sinusoidaloutput waveform synthesis with optimal sliding curve

This paper presents a discrete sliding-mode control scheme with feedforward compensation for the closed-loop regulation of the pulse-width modulated (PWM) inverter used in an uninterruptible power supply (UPS). The proposed feedforward controller can effectively improve the tracking performance of the PWM inverter. In designing the sliding-mode controller, we have taken load disturbance into consideration to enhance the robustness of the PWM inverter. Moreover, the upper bound of the load disturbance under which the sliding condition can be maintained has also been derived. The sliding curve of the sliding-mode controller is designed such that the behavior of the controlled PWM inverter is optimal subject to the selected cost function. Due to the coordinate transformation proposed in this paper, only the output voltage needs to be measured as feedback for the purpose of closed-loop regulation. Simulation and experimental results are given to show the effectiveness of the proposed control scheme     

利用震荡环频率特性提取多位可靠信息熵的物理不可克隆函数研究

针对传统物理不可克隆函数(PUF)产生信息熵少、易受环境因素干扰等问题,该文设计一种产生多位稳定信息熵的PUF方案。该方案通过对FPGA上环形震荡器所产生频率数据的分析,从每个震荡环中提取能够代表震荡环特性的特征位作为信息熵。通过对逆变器温度特性的研究,利用电流饥饿逆变器和常规逆变器组成新的震荡环来降低温度对产生的信息熵的可靠性的影响。通过Cadence IC仿真和进行赛灵思zynq 7000系列FPGA开发平台上的实验,结果表明改进的PUF结构使用相同数量的震荡环产生更多的信息熵,并且其可靠性、唯一性均得到提升。     

Design of a sensorless commutation IC for BLDC motors

This paper presents the design and realization of a sensorless commutation integrated circuit (IC) for brushless DC motors (BLDCMs) by using mixed-mode IC design methodology. The developed IC can generate accurate commutation signals for BLDCMs by using a modified back-EMF sensing scheme instead of using Hall-effect sensors. This IC can be also easily interfaced with a microcontroller or a digital signal processor (DSP) to complete the closed-loop control of a BLDCM. The developed sensorless commutation IC consists of an analog back-EMF processing circuit and a programmable digital commutation control circuit. Since the commutation control is very critical for BLDCM control, the proposed sensorless commutation IC provides a phase compensation circuit to compensate phase error due to low-pass filtering, noise, and nonideal effects of back-EMFs. By using mixed-mode IC design methodology, this IC solution requires less analog compensation circuits compared to other commercially available motor control ICs. Therefore, high maintainability and flexibility can be both achieved. The proposed sensorless commutation IC is integrated in a standard 0.35-/spl mu/m single-poly four-metal CMOS process, and the realization technique of this mixed-mode IC has been given. The proposed control scheme and developed realization techniques provide illustrative engineering procedures for the system-on-a-chip solution for advanced digital motor control. Simulation and experimental results have been carried out in verification of the proposed control scheme.     

基于重复控制与电压双闭环控制的逆变器设计

文章提出了一种基于重复控制与电压双闭环控制相结合的单极倍频SPWM正弦波逆变器控制方案,详尽阐明了单极倍频SPWM控制方式的工作原理,并给出了逆变系统的数学模型,在此基础之上研究了重复控制与电压双闭环控制相结合的控制方案。实验结果表明：这种逆变器输出电压只有较小的谐波含量,同时具有良好的动态特性。