Aluminum electrolytic condenser

Abstract

Provided is an aluminum electrolytic capacitor with reduced ESR (equivalent series resistance) and ESL (equivalent series inductance). In an aluminum electrolytic capacitor including a capacitor element 1 having an anode side lead terminal 3 for anode lead-out and a cathode side lead terminal 5 for cathode lead-out, a bottomed exterior case 9 in which the capacitor element 1 is stored, and a seal rubber 8 sealing the opening part of the bottomed exterior case 9, there is a terminal structure having the selected number of the anode side and cathode side lead terminals 3 and 5 from the range within 2 to 4, respectively. By this plural terminal structure, there is a circuit in which ESR and ESL are equivalently arranged in parallel. Thereby, the resistance of the lead terminal that is the ESR component and the connection resistance between foil and the lead terminal are eliminated, so the ESR can be reduced. Moreover, the influence of inductance of the lead terminal can be removed, so the ESL can be reduced.

Description

technical field [0001] The present invention relates to an aluminum electrolytic capacitor including a vertical type capable of surface mounting, and more particularly, to an aluminum electrolytic capacitor with reduced ESR (equivalent series resistance) and ESL (equivalent series inductance). Background technique [0002] In recent years, circuits have been required to be miniaturized and adaptable to high frequencies, and therefore capacitors are also required to have low impedance. Especially for computer CPU drive circuits and switching power supply circuits, the circuit design requires absorption of high-frequency noise and ripple current, and it is particularly urgent to achieve low ESR (equivalent series resistance) and low ESL (equivalent series resistance). series inductance) capacitors. [0003] Among the conventional aluminum electrolytic capacitors, for example, the basic structure of a wound solid electrolytic capacitor is the same as that of the wound solid el...

AI Technical Summary

Problems solved by technology

[0015] However, in a two-terminal structure in which the anode-side lead terminal from the anode and the cathode-side lead terminal from the cathode are each one, as in Figure 16 As shown in the part surrounded by double dotted lines, the equivalent circuit is to arrange ESR and ESL in series, so the resistance of the lead terminal and the contact resistance between the energizing foil and the lead terminal make the impedance and ESR (equivalent series resistance) have a certain relationship. limit

In addition, due to the L (inductance) amount of the lead terminal, there is a limit to reducing the ESL (equivalent series inductance)

[0016] In addition, when the conventional two-terminal structure is used in a high-frequency application circuit through which a large current flows, there is a problem that the current capacity of the lead terminal and the resistance of the connecting portion between the lead terminal and the electrode foil cause heat generation. , so no large current can flow

[0018] Furthermore, when an aluminum electrolytic capacitor is used in a high-frequency application circuit in which a large current flows, a large current cannot flow due to heat generated by the current capacity of the lead terminal and the resistance of the connecting portion between the lead terminal and the electrode foil. electric current

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