The switching point of the micro switch , which is installed as a two - way switch , can be varied over the entire temperature range 微开关的开关点是一个双向开关,可以在整个温度范围内变化。
Combinations of igbts controlled by four - step current commutation algorithm , was implemented by the cpld , which was also forecasted and validated by the simulation and experiment 为进行对矩阵式变换器系统的实验研究,采用cpld (复杂可编程逻辑器件)实现了igbt组合双向开关的四步换流逻辑控制,并通过仿真和实验进行了预测和验证。
Due to the lack of the true bi - directional switches at present , the combinations of igbts controlled by four - step current commutation algorithm were adopted in the simulation , which made the study very close to the reality 针对当前尚无双向开关器件的现状,仿真中首次采用了igbt组合双向开关并应用四步换流控制实现开关的安全切换,仿真结果非常贴近实际。
Harmonic components of the input current in method 2 is lesser than method 1 , neglecting the losses and switching effects of the converter . the decreation of the harmonic components is not apparent , but different between method 2 and method 1 , due to the influence of switch losses of the igbt , which is consisted of two igbt and two frd 当仿真模型中的双向开关由两个igbt和两个快恢二极管组成时,由于igbt的开关损耗等因素对输入电流的影响,在仿真得到的输入电流频谱图中,谐波成分的减小不是很明显,但调制策略方式2和方式1的谐波成分仍有所不同。