外文翻译--变频器和单片机的基本知识.doc

Basic Knowledge of Inverters and Single-chip Frequency AC motor speed control used as the principal means have been used in a wide range of applications in the industrial area .It has a wide range of speed, steady speed and high precision, fast dynamic response for a wide range of technical performance and reliable operation has been gradually replace the DC motor speed control system. There are three main control types of inverter: first,through the operator panel inverter, that is, through the operation panel to change the output frequency and other operating parameters.Second, in the frequency converter analog input 0 ~ 10V or 4 ~ 20mA signal.Control the output frequency by changing the size of input analog converter.Third,control the communications port through the inverter. The first scene in general is used for manual adjustment and parameter settings,The latter two kinds of methods are mostly used for automatic regulation and remote control. Commonly PLC, DCS and other control systems in industrial area are applicable to the conditions of inverter interface control module,which can facilitate the realization of the closed-loop converter automatic control.They are more commonly used in large and medium-sized control systems. For some small experimental device and embedded control device, besides controlling the frequency converter, the processor generally also need to deal with keyboard input, display, data acquisition and other work such as process control.Such control is more suitable for single-chip control system as the core.When it comes to the PLC in the form of additional operating panel. It can achieve the function but the cost is too high,So it should not be used. Using single-chip control inverter can choose the last two kinds of methods.The advantage of the use of communication control full control function. By the appropriate level-shifting inverter circuit suitable for the form of communication ,then it can communicate with the inverter.The