Bus capacitor structure and elevator frequency converter

Abstract

The invention relates to a bus capacitor structure and an elevator frequency converter. The bus capacitor structure comprises a positive electrode copper bar and a negative electrode copper bar. The bus capacitor structure also comprises a circuit board,a positive electrode metal foil and a negative electrode metal foil, wherein the positive electrode metal foil is arranged on one surface of the circuit board, and the negative electrode metal foil is arranged on the other surface of the circuit board; a bus capacitor module set arranged on the circuit board comprises two capacitor modules which are connected in series; each capacitor module comprises a positive electrode bus capacitor unit and a negative electrode bus capacitor unit which are connected in parallel, wherein the positive electrode bus capacitor unit comprises a plurality of bus capacitors of which the current input ends are connected with the positive electrode copper bar through positive electrode metal foil and of which the current output ends are connected with the negative electrode copper bar through the negative electrode metal foil, and the negative electrode bus capacitor unit comprises a plurality of bus capacitors of which the current output ends are connected with the negative electrode copper bar through the negative electrode metal foil and of which the current input ends are connected with the positive electrode copper bar through the positive electrode metal foil. According to the bus capacitor structure, the installation tolerance is reduced, the miniaturization of the bus capacitor structure is realized, and the parasitic inductance of a loop and the parasitic inductance caused by current flowing through the copper bars are effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bus capacitor structure and an elevator frequency converter. Background technique [0002] The existing elevator inverter bus capacitors use multiple bulky bolt-type electrolytic capacitors. The electrodes of the bolt capacitors are connected to the upper copper plate through fasteners. The copper plate is divided into upper and lower layers. The two layers are separated and combined by insulating materials. into an assembly. Huge bolt-type busbar capacitors and copper plates make it impossible to miniaturize elevator inverter products. At the same time, the copper plate design with stacked insulation and isolation is adopted, which is costly; the lead-out terminals at the left and right ends of the copper plate are connected to the input and output sides of the elevator inverter. The IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) power m...

AI Technical Summary

Problems solved by technology

Huge bolt-type busbar capacitors and copper plates make it impossible to miniaturize elevator inverter products. At the same time, the copper plate design with stacked insulation and isolation is adopted, which is costly; the lead-out terminals at the left and right ends of the copper plate are connected to the input and output sides of the elevator inverter. The IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) power module, because there are many positioning screw holes in the power module, the accumulated tolerance is large, and the tolerance is finally accumulated on the bolted electrolytic capacitor mounting hole in the middle of the copper plate. Affected by mechanical stress, it is not only inconvenient to install, but also affects the performance and life of the capacitor, resulting in a decline in the performance of elevator inverter products

[0003] In the process of implementation, the inventors found that there are at least the following problems in the traditional technology: the existing elevator inverter bus capacitor is bulky, the tolerance of the production and installation process is large, and the parasitic inductance of the copper plate cannot be effectively eliminated, which affects the performance and life of the capacitor.

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