Four-parallel-connection power module group of inverter

Abstract

The invention discloses a four-parallel-connection power module group of an inverter. Each power module comprises a plurality of IGBT modules, a power busbar, a heat dissipation assembly, a power module shell assembly used for fixing the modules and assemblies and the like. The IGBT modules are power module core assemblies. The power busbar is used for connecting the IGBT modules and a capacitor busbar. The heat dissipation assembly is mainly a heat radiator and is used for dissipating heat for the IGBTs and fixing the IGBT and other assemblies; the shell assembly is composed of a power moduleshell and a part of insulating supporting pieces and used for fixing devices such as the heat radiator. A plurality of IGBT modules contained in one power module share one heat radiator, the layout is compact, the heat dissipation efficiency of the heat radiator is effectively improved, and meanwhile, the complexity in the assembly process is also reduced. The power modules are designed and installed behind a capacitor module, thereby preventing the capacitor module from being directly pressed on the power busbar to cause damage to the power busbar when the capacitor module and the power module are installed up and down.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected inverters, and in particular relates to a four-parallel power module group of an inverter. Background technique [0002] As an important part of the new energy industry, photovoltaic grid-connected inverters have developed rapidly in recent years, with higher conversion efficiency and higher overall power. As the core component of photovoltaic inverters, power modules are also developing toward highly integrated modules and highly compact structures, but there are still some shortcomings in the practical application of high-power inverters. [0003] 1) As a high power consumption device, the operating temperature of the power module can reach 90°C-100°C, which has high requirements on the heat dissipation structure and efficiency of the inverter, while the 1400A IGBT module used in previous products, a single IGBT The module is large in size, and the hot spots are concentrated...

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Problems solved by technology

[0003] 1) As a high power consumption device, the operating temperature of the power module can reach 90°C-100°C, which has high requirements on the heat dissipation structure and efficiency of the inverter, while the 1400A IGBT module used in previous products, a single IGBT The module is large in size and the hot spots are concentrated, which is not conducive to the heat dissipation of the radiator. The design of the heat dissipation structure is unreasonable and the heat dissipation efficiency is low.

[0004] 2) Since the core component of the power module, IGBT, has been monopolized by foreign technology companies for a long time, the price and cost are high, and the 1400A IGBT module commonly used in the previous products has recently encountered problems such as insufficient production capacity and low supply

[0005] 3) In addition, the power module of the inverter is composed of a variety of components. If the structural layout is unreasonable, it will cause problems such as too large overall module volume and low space utilization efficiency.

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