Midpoint clamping type three-level inverter with dustproof and moistureproof structure

Abstract

A midpoint clamping type three-level inverter with a dustproof and damp-proof structure comprises a machine body, a plurality of interfaces are formed in the machine body, a shell is arranged on the outer side of the machine body, a protective cover is arranged on the front end face of the shell, a front baffle is fixedly connected to the front end face of the shell, and the front baffle is located at the bottom of the shell. The protective cover is inserted into the front baffle, and two limiting sliding blocks are fixedly connected to the side, close to the shell, of the protective cover. Acavity is formed in the protective cover, the interface of the machine body can be hidden in the cavity, the protective cover is sealed on the front end surface of the shell, and the protective covermade of Teflon has the characteristic of moisture resistance, so that the protective cover seals the interface of the machine body and is not easily infected by dust or water drops, and the problems that the interface is exposed outside, when the machine body is transported or is not used for a long time, the dust or water drops are easy to intrude into the interface, the midpoint clamping type three-level inverter is easy to damage, and the use is influenced are solved.

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...

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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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