變頻器控制電路設(shè)計(jì) 畢業(yè)論文

1、攀枝花學(xué)院?？飘厴I(yè)設(shè)計(jì)（論文）變頻器控制電路設(shè)計(jì)學(xué)生姓名： XXX 學(xué)生學(xué)號： 200821213369 院（系）： 工程技術(shù)學(xué)院 年級專業(yè)： 生產(chǎn)過程自動化 指導(dǎo)教師： XXX 副教授 二〇一〇年十二月ABSTRACT ABSTRACTComposed with SCM of the VVVF controller being able to start from low

2、 frequency (50Hz) to 1000Hz.It can remove the working band in the past start the impingement to the electric motor directly. At the same time, since the frequency converter can adjust output voltage fit in with itself

3、, making loads motor can work under fixed voltage, which not only energy conservation but also prolong the life time of the motor.In this paper, cross - straight - cross the main circuit design, in front of a rectifier c

4、ircuit, the back is a full-bridge inverter circuit, which by the four N-channel MOSFET component, such as tubes formed by the same symmetry of the bridge circuit of better control of small pressure drop, reducing the ene

5、rgy loss of this; output link using the LC filter circuit. Inverter circuit by the drive circuit composed of discrete components, that while an increase of circuit complexity, but greatly reduced the design cost. Control

6、 circuit and driver circuit using optocoupler completely isolated, so that the main cause of the circuit due to the outside world, when major fluctuations will not affect the normal operation of control circuit. For the

7、control of the microprocessor core based on the LM3S1138, LM3S1138 produced by SPWM wave and wave PWM to drive the main circuit sine wave sent through the keyboard settings to change the output voltage frequency and ampl