The Research Of Sine-wave Inverter Power Supply Based On DSP

The development of inverter power supply is contacted with the development of power electronic. With the rapid development of power electronic, inverter power supply is more and more widely used in a lot of fields. The requirement output waveform of inverter power supply is rising. The output quality of inverter power supply mainly includes three aspects. One is the accuracy of stable output waveform; the second is the good transient response; the third is the good load compatibility. So research on inverter power supply which's structure is not only simple, but also have better transient and stable performance is always the last aim in the tectonics field of inverter power supply. In order to get high quality and high reliability inverter power supply , this paper presents the study of there-loop feedback control scheme, output phase control, the digital control system of inverter power supply.This paper research the main circuits parameters of single phase full-bridge inverter and three-phase full-bridge inverter, which includes inverter circuit, absorb circuit, drive circuit, transformer and filter. The reasons of transformer bias magnetization are analyzed, and at last measures of valid restrained bias magnetization are given. Aim at three-phase full-bridge inverter always couldn't output three balance voltages, the thesis research one three-phase inverter power supply which could have good imbalance load compatibility.This thesis research the principle of inverter power supply's control principle, then builds the system dynamic model of inverter power supply. The inverter power supply-performance of adopting a variety of control methods are researched contrastively. At last multiple-loop feedback control scheme suitable for high-performance inverter power supply have been adopted for this paper. In addition, aiming the output voltage-phase lag the standard sine-phase, this thesis makes use of the voltage instantaneous loop to control the output lagging-phase, this scheme is valid, but output-phase has steady-state error. Aim at this, this thesis presents a phase-move control scheme, which is equal to add a phase feedback control out of the multiple-loop feedback. In this way, the inverter power supply's output phase-error that could be effective compensated, and the output more precision phase. This thesis also designs inverter power supply digital control system, uses TMS320LF2407 to produce SPWM, gives the realizing of digital control method, and implemented by DSP. Thanks to Multiple-loop feedback control scheme, the system has excellent voltage regulation performance, fast dynamic response, good disturbance rejection and high nonlinear load compatibility, which has good improvement of inverter power supply's performance.