Capacitor unit

Abstract

The invention provides a capacitor unit which is invented for solving the problems of low integration, different maintenance, large inductance and the like in the prior art. A plurality of capacitor monomers are distributed into a capacitor array, an upper composite busbar and a lower composite busbar are covered on the upper side and the lower side of the capacitor array, electrode sheets are led out on the same sides of the upper composite busbar and the lower composite busbar, a terminal board is made of insulation materials and arranged on the side where the electrode sheets are led out on the composite busbars, and an inserting lead-out terminal is installed on the terminal board and electrically connected with the electrode sheets. The capacitor unit adopts an integrated structure and is convenient to assembly, maintain and use. Lead inductance is low, capacitors are evenly distributed, and the capacitor unit can be manufactured in batch easily.

Description

technical field [0001] The invention relates to a device for an inverter unit of a converter, in particular to a capacitor unit connected to a DC bus of the inverter unit. Background technique [0002] In the traditional inverter unit of the converter, the connection between the capacitor and the power components such as the DC bus or IGBT usually uses copper bars or bus bars. The disadvantages of this method are: [0003] 1) Connected by copper bars or busbars, the inductance of the leads is large, and the capacitance is unevenly distributed; [0004] 2) The existing capacitors use traditional power capacitors, that is, through a metal shell, two lead-out terminals are drawn out on one side of the shell, and multiple capacitor cores are arranged in the shell to achieve the required The required voltage and capacitance; the heat generated by each component in the working state cannot be effectively and quickly dissipated, resulting in the accumulation of heat in a certain p...

AI Technical Summary

Problems solved by technology

[0002]In the traditional inverter unit of the converter, the connection between the capacitor and the power components such as the DC bus or IGBT usually uses copper bars or bus bars. The disadvantages are:

[0003]1) Connected by copper bars or busbars, the inductance of the leads is large, and the capacitance distribution is uneven;

[0004]2) The existing capacitors use traditional power capacitors, that is, through a metal shell, two lead-out terminals are drawn on one side of the shell, and inside the shell There are multiple capacitor cores connected in series and parallel to achieve the required voltage and capacitance; the heat generated by each component in the working state cannot be effectively and quickly dissipated, resulting in the accumulation of heat in a certain part, making a certain capacitor The core causes thermal breakdown leading to failure of the entire capacitor

[0005]3) In the existing connection method, the connection between capacitors and devices is intricate and inconvenient to install, which directly affects the effective operation of electrical equipment and cannot meet the needs of the existing power electronics industry. The rapidly developing demand for the integration of various components in the

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