The content of this dissertation belongs in the research fields of power appliance technology. The performances of inventers are becoming more and more important along with the inverter technology’s widely using in lots of fields as the high speed developing of the power electronics and the more need for the electrical systems on control performance in some fields. As we know, the quality of electrical energy is more and more demanding in the modern industrial applications.
As one of inventers, SPWM inventers can achieve low total harmonic distortion (THD) output wave. With the development of digital control techniques, the production of SPWM and digital control of inventers become convenient, which makes the output wave’s steady-state precision, transient and steady state response, reliability improved. In addition, performances’ improvements of the inventers are also based on closed-loop control of output wave. Pure digital control technique, such as repetitive control, digital PID control , sliding mode control and one-cycle control, have being used in these fields.
In view of this, the design is the use of technology SPWM inverter power inverter, using single-chip microcomputer to control the entire system, so that the digital power inverter, LED display of the system can be intuitive. Digital control of the inverter to allow more convenient and steady state response, reliability improved. In addition, performances’ improvements of the inverters are also based on closed-loop control of output wave. Because of this design is the original on the basis of laboratory equipment to improve, streamline the design of a component part, joined the photoelectric isolation technology, eliminating the interference of external power, making the output more accurate.
Keywords: inverter；SPWM；Optical isolation；8051； LED
