Three-phase seven-level inverter used for experiment teaching

Abstract

The invention discloses a three-phase seven-level inverter used for experiment teaching. The three-phase seven-level inverter includes a processor unit, a programming unit, a power supply unit and a sampling unit. The processor unit is a digital signal processor. The programming unit includes a field programmable gate array and a CD-R machine. The field programmable gate array is connected with the signal processor. The CD-R machine is connected with the field programmable gate array. The power supply unit includes isolation transformers and a power unit. Each isolation transformer includes one channel of input voltage and three channels of output voltage. The isolation transformer and the power unit can both be connected to the field programmable gate array. The sampling unit includes a voltage sampling unit and a current sampling unit. The voltage sampling unit and the current sampling unit are both connected with the processor unit. Compared with a large power inverter used in traditional industry, the small power inverter requires no expensive phase shift transformer but a plurality of isolation transformers. The three-phase seven-level inverter used for experiment teaching can be widely applied to fields such as teaching instrument devices and has characteristics of low price, reliable performance, demonstration convenience and the like.

Description

technical field [0001] The invention relates to the field of inverters, in particular to a three-phase seven-level inverter used for experimental teaching. Background technique [0002] Multi-level inverter technology is a new type of inverter that achieves high-voltage and high-power output by improving the topology of the inverter itself. Its main advantages include: the output voltage presents a stepped waveform, the output harmonics and dv / dt are small ; A single device has low withstand voltage; it is suitable for high-voltage occasions, etc. According to different topological structures, it can be roughly divided into diode-clamped multi-level, flying capacitor multi-level, cascaded multi-level and hybrid multi-level. [0003] Since the cascaded multilevel inverter is based on a common single-phase H-bridge inverter, each unit is powered independently, and its electrical characteristics are reliable. It is the preferred topology for product-level multilevel inverters....

AI Technical Summary

Problems solved by technology

However, this kind of products, in low-power application situations such as ordinary teaching and demonstration, the price will be relatively expensive and the cost will be high.

Images