The development of inverter power supply is closely related to the development of power electronic devices. With the rapid development of modern power electronic technology, inverter power supply is increasingly widely used in many fields, and at the same time, higher and higher requirements are put forward for the quality of the output voltage waveform of the inverter power supply. The output waveform quality of the inverter power supply mainly includes three aspects: one is high output stability and accuracy; the second is good dynamic performance; the third is strong load adaptability. Therefore, the development of an inverter power supply with a simple structure, excellent dynamic and static performance and load adaptability has always been the goal pursued by researchers in the field of inverter power supply. This paper studies the three-closed-loop control scheme of the inverter power supply, output phase control, and digital control system of the inverter power supply, in order to obtain an inverter power supply with high quality and high reliability. This paper studies the main circuit parameters of the single-phase full-bridge inverter power supply and the three-phase bridge inverter power supply, including the inverter, absorption circuit, drive circuit, transformer and filter, and conducts an in-depth analysis of the causes of the bias magnetization of the inverter power supply transformer. Finally, effective anti-bias magnetization measures are given. In view of the fact that the three-phase bridge inverter power supply usually cannot ensure the balance of the three-phase voltage output, a three-phase inverter power supply that can carry an unbalanced load is studied. The control principle of the inverter power supply is studied, and the dynamic model of the inverter power supply system is established. On this basis, the performance of various control schemes of the inverter power supply is compared and studied, thereby determining a novel high-performance inverter power supply multi-closed-loop control scheme. In addition, in view of the inherent lag problem of the inverter power supply output phase, a strategy of using the voltage instantaneous value inner loop to compensate for the lagging phase angle of the inverter power supply is adopted. Analysis shows that although the above control strategy is effective, it cannot achieve steady-state error in the output phase angle. In this regard, a phase shift control scheme is proposed, which is equivalent to adding a phase control loop on the basis of the original multi-loop control scheme. In this way, the output phase error of the inverter power supply can be effectively compensated, and the output phase accuracy is higher. This article designs an inverter power supply digital control system, uses TMS320LF2407A to control the generation of SPWM waves, gives the control system DSP program operation flow chart, and uses DSP to realize it digitally. The adoption of the multi-loop feedback control system enables the system to have excellent steady-state characteristics, dynamic characteristics and adaptability to nonlinear loads, and effectively improves the performance of the inverter power supply.
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