基于单片机的电机软起动控制器的设计

软起动器是电机软起动控制的核心,电机软起动时,通过软起动控制器控制功率变换单元,进而改变电机与可变电抗器之间的阻抗比例关系,实现调压,从而达到软起动的卧的。文中采用单片机设计电机软起动控制器,实现了智能控制,取得了较好的起动效果。经过试验表明,采用该软起动控制器时可以有效地减小电动机的起动电流,从而达到保护电机和设备的目的,表明该软起动器在电机起动过程中具有良好的起动效果。     

交流异步电动机智能软起动器的原理与应用

本文分析了智能软起动器的工作原理、起动和停机方式，具体讨论了软起动方式与传统起动方式在起动交流异步电动机时的不同性能，阐述了软起动器的工作特点，说明了智能软起动是一种先进的异步电动机起动控制技术。     

基于无速度传感器的高转矩软起动器的研究

本文对无速度传感器的软起动器进行了深入剖折，所研究的软起动器具备四种起动方式：电压斜坡起动、限流起动、转速斜坡起动和分级变频起动。提出了基于无速度传感器的分级变频高转矩异步电机软起动方案。研制出基于80C196KC单片机控制的无速度传感器的分级变频高转矩软起动器。该软起动器具有结构简单，起动转矩大，能实现速度闭环控制的优点，使软起动器控制技术提高了一步，并且有持续研究开发的前景，有望在较广泛的应用领域得到推广应用。     

高转矩软起动器的研究

本文研究了三相感应电动机高转矩软起动的控制方法。在理论分析与仿真的基础上，完成了以intel 16位单片机为微处理器的高转矩软起动器的实验研究、实践表明，基于高转矩的软起动器能使电机以高转矩和较小起动电流平滑起动。负载试验结果与传真结果基本吻合，证明了这种高传矩软起动理论的正确性和有效性。     

开关变压器式软起动器在除鳞水泵上的应用

本文介绍了开关变压器式高压电机软起动器在济钢1700热连轧厂高压水除鳞系统改造工程上的应用,阐述了开关变压器式软起动器的工作原理和特点。该软起动器在电机起动过程中起动电流小,无机械冲击：高次谐波少,安全可靠：节能等要求,很好地解决了高压电动机软起动方面的难题,并且在实际生产中的维护量很小,应用效果良好。     

电子软起动器的理论研究与实践应用

交流三相异步电机的广泛使用对电动机的起动方式要求越来越高,针对传统降压起动方式的二次电流冲击问题,提出电机的软起动。文章介绍了软起动器的现状及优点,阐述了工作原理,而且绘制了各种软起动方式中电压和电流的变化曲线,最后结合实践,针对软起动器的保护功能,给出了各种保护功能下元器件的选择方法和参数计算。     

基于九点控制器的电机软起动器设计

提出了一种以80C196KC单片机为核心．基于九点控制器的电机软起动控制器的设计方案，阐述了软起动器的工作原理、回路结构和软件程序结构。该软起动器可根据采样信号和键盘的设定值来计算电压偏差和偏差变化率，并由九点控制算法控制触发角的大小。从而控制电机电压的缓慢上升。     

低压交流电动机的起动

本文按照国标就什么场合应该全压起动，什么场合采用软起动（也就是降压起动）进行了论证，介绍了软起动的发展过程，对常见的几种起动方式进行了讲述并分析了各自的优缺点及其实际应用价值，尤其是对内置旁路型电子软起动器的先进性与较高的实际应用价值进行了着重论述。希望对低压交流电机起动方式的选择能起到指导作用。     

关于软启动器控制系统的实现

随着我国经济社会的快速发展，用电质量要求越来越高，软起动器被广泛应用于供水、油田、冶金、钢铁、建筑等各个领域，它集电机软起动、软停车、轻载节能和多种保护功能于一体，解决了传统的降压起动设备的诸多弊端。     

基于80C196KC单片机控制的软起动器的研制

本文介绍的软起动器以80C196KC单片机为核心构成控制单元，利用GAL器件实现触发脉冲的产生，该软起动器具有限流起动，斜坡电压起动，分级变频高转矩起动三种方式，并具有使电机起动电流小，起动转矩大，起动平滑，运行稳定，控制效果好的特点。     

A High Efficiency Dual-Mode Buck Converter IC For Portable Applications

This paper presents the design of a novel wide output current range dual-mode dc to dc step-down (Buck) switching regulator/converter. The converter can adaptively switch between pulsewidth modulation (PWM) and pulse-frequency modulation (PFM) both with very high conversion efficiency. Under light load condition the converter enters PFM mode. The function of closing internal idle circuits is implemented to save unnecessary switching losses. The converter can be switched to PWM mode when the load current is greater than 100 mA. Soft start operation is designed to eliminate the excess large current at the start up of the regulator. The chip has been fabricated with a TSMC 2P4M 0.35 mum polycide CMOS process. The range of the operation voltage is from 2.7 to 5 V, which is suitable for single-cell lithium-ion battery supply applications. The maximum conversion efficiency is 95% at 50 mA load current. Above 85 % conversion efficiency can be reached for load current from 3 to 460 mA.     

基于PIC的智能异步电机软启动器研究

介绍了一种以PIC18sF4550单片机为控制核心的三相异步电动机软起动器,分析了该系统的工作原理、功能及应用场合。本软起动器优化了传统的限流软起动,电压斜坡软起动,并为降低泵类负载起动和停止时造成的水锤和管路振动现象,设计增加了转矩闭环控制软起动方式。增设了多功能上位机远程监控系统,具有显示现场运行状态等功能,实现了智能化监控。     

一种面向单片DC/DC的低压高效片上电流检测技术

本文提出并实现了一种面向电流模式单片开关DC/DC转换器的低压高效片上电流采样电路.该电路利用功率管等效电阻电流检测技术和无需OP放大器的源极输入差分电压放大技术,使电路的应用范围可低达2.3V;-3dB带宽12MHz;在最大负载电流情况下的静态电流峰值仅19μA,比常规采用功率管镜像电流检测技术的静态电流峰值低1.5个量级左右.转换器基于0.5μm 2P3M Mixed Signal CMOS工艺设计制作.测试结果表明,电流检测电路的最大检测电流1.1A,转换器的输入最低电压2.3V,重负载转换效率高于93%.     

A novel on-chip high to low voltage power conversion circuit

A novel power supply transform technique for high voltage IC based on the TSMC 0.6μm BCD process is achieved. An adjustable bandgap voltage reference is presented which is different from the traditional power supply transform technique. It can be used as an internal power supply for high voltage IC by using the push-pull output stage to enhance its load capability. High-order temperature compensated circuit is designed to ensure the precision of the reference. Only 0.01 mm2 area is occupied using this novel power supply technique. Compared with traditional technique, 50% of the area is saved, 40% quiescent power loss is decreased, and the temperature coefficient of the reference is only 4.48 ppm/℃. Compared with the traditional LDO (low dropout) regulator, this power conversion architecture does not need external output capacitance and decreases the chip-pin and external components, so the PCB area and design cost are also decreased. The testing results show that this circuit works well.     

应用于升压型DC-DC的新颖软启动电路的设计

提出了一种新颖的软启动电路,实现了输出电压无过冲平滑启动。该电路有效抑制了DC-DC开关电源上电启动过程出现的浪涌电流和输出电压的过冲,同时该软启动电路克服了传统软启动电路无法带载启动的缺点。电路完全集成在芯片内部,避免了使用额外电容而占用过多面积。利用Cadence Spectre仿真平台对电路进行了仿真验证,仿真结果表明,在输入电压为2.4~4.2 V的同步升压DC-DC芯片中,负载在0~2.1 A范围内启动,均未出现电感电流和输出电压的过冲。     

A novel high voltage start up circuit for an integrated switched mode power supply

A novel high voltage start up circuit for providing an initial bias voltage to an integrated switched mode power supply(SMPS) is presented.An enhanced mode VDMOS transistor,the gate of which is biased by a floating pisland, is used to provide start up current and sustain high voltage.An NMOS transistor having a high source to ground breakdown voltage is included to extend the bias voltage range to the SMPS.Simulation results indicate that the high voltage start up circuit can start and restart as designe...     

A 3 A sink/source current fast transient response low-dropout Gm driven linear regulator

A 3 A sink/source G_m-driven CMOS low-dropout regulator(LDO),specially designed for low input voltage and low cost,is presented by utilizing the structure of a current mirror G_m(transconductance)driving technique,which provides high stability as well as a fast load transient response.The proposed LDO was fabricated by a 0.5μm standard CMOS process,and the die size is as small as 1.0 mm~2.The proposed LDO dissipates 220μA of quiescent current in no-load conditions and is able to deliver up to 3 A of load current.The measured results show that the output voltage can be resumed within 2μs with a less than 1mV overshoot and undershoot in the output current step from-1.8 to 1.8 A with a 0.1μs rising and falling time at three 10μF ceramic capacitors.     

Design of charge pump circuit with consideration of gate-oxide reliability in low-voltage CMOS processes

A new charge pump circuit with consideration of gate-oxide reliability is designed with two pumping branches in this paper. The charge transfer switches in the new proposed circuit can be completely turned on and turned off, so its pumping efficiency is higher than that of the traditional designs. Moreover, the maximum gate-source and gate-drain voltages of all devices in the proposed charge pump circuit do not exceed the normal operating power supply voltage (VDD). Two test chips have been implemented in a 0.35-/spl mu/m 3.3-V CMOS process to verify the new proposed charge pump circuit. The measured output voltage of the new proposed four-stage charge pump circuit with each pumping capacitor of 2 pF to drive the capacitive output load is around 8.8 V under 3.3-V power supply (VDD = 3.3 V), which is limited by the junction breakdown voltage of the parasitic pn-junction in the given process. The new proposed circuit is suitable for applications in low-voltage CMOS processes because of its high pumping efficiency and no overstress across the gate oxide of devices.     

交流异步电动机的软起动

由于传统交流异步电动机的起动方法有两次冲击电流,可对负载产生冲击转矩,采用晶闸管技术实现交流异步电动机软起动,介绍了该技术的工作原理。针对重载起动,传统软起动的局限性,提出采用交-交变频起动和晶闸管调压软起动相结合的方法,并通过试验测试该软起动方法能够解决重载起动时的电压波动影响,具有实际应用价值。