A capacitive connection structure to reduce inductance

Abstract

The invention discloses a capacitance connecting structure for reducing inductance. The capacitance connecting structure comprises capacitance cores arranged in a layered stacking manner, and busbars used for connecting the capacitance cores, wherein the busbars comprise lead-out parts and connecting parts; the lead-out parts are used for connecting positive and negative lead-out conductors; the connecting parts are used for connecting the capacitance cores; an upper busbar is arranged at the top of each capacitance core; a lower busbar which has vertical flip with each upper busbar is arranged at the bottom of each capacitance core; and connecting parts of the upper busbars and the lower busbars are respectively connected with metal spraying surfaces on the two sides of the capacitance cores. The capacitance connecting structure is an internal structure of a power capacitor; a high-capacity power capacitor can be obtained by adjusting the quantity and an arrangement manner of the capacitance cores as required; self-inductance of the power capacitor can be reduced by a connecting manner of the busbars; circuit equilibrium of the capacitor at high frequency can be ensured; passing current of each capacitance core is stable; and an application characteristic of the capacitor at the high frequency can be greatly improved.

Description

technical field [0001] The invention relates to the field of power capacitors, in particular to a capacitive connection structure for reducing inductance. Background technique [0002] Power capacitors are common elements in power circuits or power systems to stabilize voltage and / or current from one device or component to another. Capacitors reduce current fluctuations during power system operation by compensating for inductive loads or absorbing voltage fluctuations or voltage peaks caused by the device. When the rated power of the power system is high, multiple capacitor cores need to be connected to increase the overall capacitance of the power capacitor. [0003] At present, capacitor cores used in capacitors on the market adopt non-inductive winding, and the self-inductance of each core is extremely small, so the self-inductance of capacitors is mainly determined by the self-inductance of the connecting busbar. The capacitor core connection structure in the prior art...

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Problems solved by technology

Because of the inductance and resistance of the busbar itself, its equivalent circuit is as follows figure 2 As shown in the figure, it can be seen that the equivalent circuit of this capacitor connection structure has multiple small inductors forming a network connection. Under high-frequency AC applications, the entire circuit will be unbalanced due to the imbalance of inductance. The current is not equal, the higher the frequency, the greater the unbalance, which will cause harm to the capacitor

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