IC697MDL654
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1986年美国威斯康星大学Divan教授提出谐振式直流环逆变器。传统的逆变器是挂在稳定的直流母线上，电力电子器件是在高电压下进行转换的‘硬开关’，其开关损耗较大，限制了开关在频率上的提高。这样，可以使逆器尺寸减少，降低成本，还可能在较高功率上使逆变器集成化。因此，谐振式直流逆变器电路极有发展前途。
3 交流调速控制理论日渐成熟
矢量控制的基本思想是仿照直流电动机的控制方式，把定子电流的磁场分量和转矩分量解祸开来，分别加以控制。它需要检测转子磁链的方向，且其性能易受转子参数，特别是转子回路时间常数的影响。加上矢量旋转变换的复杂性，使得实际的控制效果难于达到分析的结果。
大致来说，直接转矩控制，用空间矢量的分析方法，直接在定子坐标系下分析计算与控制电流电动机的转矩。它省掉了复杂的矢量变换与电动数学模型的简化处理，大大减少了矢量控制中控制性能参数易受参数变化影响的问题，没有通常的PWM信号发生器，其控制思想新颖，控制结构简单，控制手段直接，信号处理物理概念明确，转矩响应迅速，限制在一拍之内，且无调，是一种具有高静动态性能的交流调速方法。
4 通用变频器开始大量投入实用
一般把系列化、批员化、占市场量大的中小功率如400KVA以下的变频器称为通用变频器。从技术发展看，电力半导体器件有GTO、GTR、IGBT，但以后两种为主，尤以IGBT为发展趋势：支频器的可靠性、可维修性、可操作性即所谓的RAS（Reliabiliry，Availability，Servicebility）功能也由于采用单片机控制动技术而得以提高。
5 单片机、集成电路及工业控制计算机的发展
以MCS—51代表的8位机虽然仍占主导地位，但功能简单，指令集短小，可靠性高，保密性高，适于大批量生产的PIC系列单片机及GMS97C（二系列单片机等正在推广，而且单片机的应用范围已开始扩展至智能仪器仪表或不太复杂的工业控制场合以充分发挥单片机的优势另外，单片机的开发手段也更加丰富，除用汇编语言外，更多地是采用论文联盟wWw.LWlm.coM模块化的C语言、PL/M语言。
在集成电路方面，需要重点说明的是集成模拟乘法器和集成锁相环路及集成时基电路在自动控制系统中运用很厂。在电机控制方面，还有于产生PWM控制信号的HEF4752、TL494、SLE4520和MA818等应用也相当广泛。
在逻辑电路方面，值得注意的是用芯片（ASIC）进行逻辑设计。ASIC（Appilca-tion Specificl，Int egrated Circuit）中有编程逻辑阵列PLD（Programmable Logic Device）。这些特点使得GAL在降低系统造价，减少产品体积和功耗，提高可靠性和稳定性及简化系统设计，增强应用的保密性方面有广阔的发展产景，特别适合新产品研制及DMA控制和高速图表处理，其上述交流的控制终用工业控制计算机完成。
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