A power module and a photovoltaic grid-connected inverter using the module

Abstract

The invention relates to a power module and a photovoltaic grid-connected inverter using the module. The photovoltaic grid-connected inverter includes a cabinet and a power module installed in the cabinet. The power module includes a chassis and a bus capacitor group installed in the chassis, For the radiator and IGBT module, the chassis has a bottom-up cooling channel and an installation cavity for the bus capacitor group and IGBT module on the left and right sides of the cooling channel. The air inlet of the cooling channel is located at the bottom of the chassis, and the air outlet is located at the top of the chassis. The heat dissipation of the power module of the present invention starts from the overall situation of the inverter, adopts the air inlet from the bottom and the air outlet from the top. It forms a circumferentially sealed heat dissipation air duct with the air inlet of the large fan on the top of the inverter, and the heat generated by the reactor and IGBT module is discharged out of the cabinet through the heat dissipation channel, and the heat dissipation effect is good.

Description

technical field [0001] The invention relates to a power module and a photovoltaic grid-connected inverter using the module. Background technique [0002] As one of the inexhaustible, non-polluting, and cleanest energy sources, solar energy has become the first choice for new energy power generation due to its four advantages: universal, harmless, huge, and long-lasting. The development and wide application of photovoltaic power generation technology plays an important role in alleviating the shortage of conventional energy and reducing environmental pollution. As the core component of the photovoltaic grid-connected inverter, the power module's electrical performance and the rationality of its structural layout directly determine the performance and dimensions of the inverter. [0003] At present, the design of the power module of the traditional high-power photovoltaic grid-connected inverter is still limited to the partial modular design of the main components, which lead...

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Problems solved by technology

[0003] At present, the design of the power module of the traditional high-power photovoltaic grid-connected inverter is still limited to the partial modular design of the main components, which leads to the following problems in the power module: 1. The module design does not consider the overall layout of the inverter, The layout of components is unreasonable, the space utilization rate is low, and the wiring is complicated and messy

2. Most of the heat dissipation of the power module adopts the way of front and rear air intake, and the small fan is used for partial heat dissipation, and the heat dissipation effect is not good.

3. The frame of the power module is mostly welded, not only the appearance is rough, it is difficult to ensure the welding accuracy, but also the production and installation efficiency is not high

4. The power module is usually installed in the cabinet by long adjustable hole bolts, and the positioning is not accurate enough, which affects the wiring effect of the incoming and outgoing wiring ports.

[0005] Although the layout of the above-mentioned power module structure is relatively reasonable, since the heat dissipation channel in the chassis is located at the bottom of the IGBI module, it can only dissipate heat for the IGBI module of the power module, but cannot dissipate heat for other parts of the power module, resulting in poor heat dissipation. good

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