Large-capacity inverter module with high-current/high-voltage IGBT directly connected in parallel

Abstract

The invention discloses a large-capacity inverter module with high-current/high-voltage IGBTs directly connected in parallel. The large-capacity inverter module comprises a water-cooled plate, discrete IGBT devices, a laminated busbar, a first absorbing capacitor, a driving loop, an AC side convergence busbar, a current sensor, a DC side laminated busbar, a second absorbing capacitor, a DC side negative convergence busbar and a DC side positive convergence busbar, wherein the number of the discrete IGBT devices is six, and the six discrete IGBT devices are sequentially and evenly arranged on the water cooling plate from top to bottom. The large-capacity inverter module with the high-current/high-voltage IGBTs directly connected in parallel have the advantages that the calculation of current impedance of the branch circuits connected in parallel is precise, the consistency is guaranteed, a high current sharing coefficient is realized, the cable lengths of the devices of different phasesof the driving loop are identical, and the paths are separated and do not interfere with one another; and the large-capacity inverter module adopts a main loop layout design, makes full use of space,optimizes circuit paths, is high in power density, has small overall module size, is simple, is convenient to maintain and install, and has good electrical properties.

Description

technical field [0001] The invention relates to the technical field of high-power inverter power supplies, in particular to a large-capacity inverter module in which high-current / high-voltage IGBTs are directly connected in parallel. Background technique [0002] High-power power electronic equipment often needs to provide high current and voltage to meet the needs of high-power or large-capacity loads. It is difficult for existing IGBT devices to provide sufficient current alone, and multiple IGBT devices need to be used in parallel in a loop to provide sufficient current output. [0003] The most important electrical parameter of high-power IGBT parallel technology is the current sharing coefficient. To achieve a high current sharing coefficient, the current general and consensus technical solutions need to consider the following points: (1) Use the same batch of IGBT devices in the parallel circuit, or the internal impedance parameters of the devices should be as consist...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a large-capacity inverter module with high-current / high-voltage IGBT directly connected in parallel, which has a high current sharing coefficient, and the cables of each phase and each device of the drive circuit have the same length, separate paths, and complementary interference; the main circuit Layout design, make full use of space, optimize circuit path, high power density, small overall module size, simple, easy maintenance and installation, good electrical characteristics, to solve the above background technology that cannot provide equal small enough loop impedance, each branch The unbalanced current causes the loss and junction temperature of each power device to be inconsistent, or even greatly different. Devices with high current flow suffer from high loss and switching overvoltage, so these devices bear high risk of damage and reduced reliability.

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