Mid-point clamped three-level inverter with dust-proof and moisture-proof structure

Abstract

A mid-point clamped three-level inverter with a dust-proof and moisture-proof structure, including a body, the body is provided with several interfaces, and the outside of the body is provided with a casing, and the front end of the casing is provided with a protective cover. The front end of the casing is fixedly connected with a front baffle, and the front baffle is located at the bottom of the casing, the protective cover is plugged into the front baffle, and the protective cover is close to the side of the casing There are two limit sliders for fixed connection; a cavity is opened through the protective cover, which can hide the interface of the body in the cavity, and the protective cover is sealed on the front surface of the shell. The protective cover made of Teflon has moisture resistance The characteristics make the protective cover close the interface of the body, which is not easy to be infected by dust or water droplets, avoiding the exposure of the interface to the outside world, so that when the body is transported or not used for a long time, dust or water droplets can easily invade the interface and be easily damaged The mid-point clamped three-level inverter affects the use of the problem.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a midpoint-clamped three-level inverter with a dust-proof and moisture-proof structure. Background technique [0002] The neutral-point clamped three-level inverter generates three levels through the neutral-point clamp and series DC capacitors. The neutral-point clamped three-level inverter is widely used in the field of high-power converters. The neutral-point clamp Compared with two-level inverters, three-level inverters have the advantages of small output voltage and current harmonics, half the voltage and switching losses of switching devices, and can effectively reduce the size of passive devices such as filters Therefore, the three-level NPC inverter has gradually moved from high-power medium-voltage applications to low-voltage 380V-690V grid-connected inverter systems for photovoltaic, wind power and energy storage systems, and multi-level inverters Because it can redu...

AI Technical Summary

Problems solved by technology

[0002] The neutral-point clamped three-level inverter generates three levels through the neutral-point clamp and series DC capacitors. The neutral-point clamped three-level inverter is widely used in the field of high-power converters. The neutral-point clamp Compared with two-level inverters, three-level inverters have the advantages of small output voltage and current harmonics, half the voltage and switching losses of switching devices, and can effectively reduce the size of passive devices such as filters Therefore, the three-level NPC inverter has gradually moved from high-power medium-voltage applications to low-voltage 380V-690V grid-connected inverter systems for photovoltaic, wind power and energy storage systems, and multi-level inverters Because it can reduce the voltage stress of switching devices, increase switching frequency, and output waveform with higher sine degree, it has more and more applications in motor drive, grid-connected inverter and other occasions. , only need a single DC source and other reasons to become one of the most widely used topologies in multi-level topology, when wiring on the neutral-point clamped three-level inverter, through the interface connection, the neutral-point clamp can be used bit type three-level inverter, but often the terminal face of the mid-point clamped three-level inverter is exposed to the outside world, so that the interface is exposed to the outside world, so that the mid-point clamped three-level inverter During transportation or when not in use for a long time, dust or water droplets are easy to invade the interface, which is easy to damage the neutral point clamped three-level inverter and affect the use

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