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Electrolytic capacitor modules, filter circuits and power converters

A technology for electrolytic capacitors and capacitors, applied in the direction of electrolytic capacitors, capacitor electrodes, capacitors, etc., can solve the problem of large loss of aluminum electrolytic capacitors, and achieve the effect of improving responsiveness, realizing miniaturization and light weight.

Active Publication Date: 2022-05-31
NIPPON CHIMI CON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent document 1 only describes that the loss of aluminum electrolytic capacitors is large, and does not mention the use of electrolytic capacitors in the parallel connection of capacitors described in patent document 1.

Method used

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  • Electrolytic capacitor modules, filter circuits and power converters
  • Electrolytic capacitor modules, filter circuits and power converters
  • Electrolytic capacitor modules, filter circuits and power converters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0069] A of FIG. 1 shows an electrolytic capacitor module of one embodiment. The configuration shown in FIG. 1 is an example and is not limited to

[0072] The electrode foil is, for example, the electrode foil on the anode side, and is a valve metal foil such as aluminum. The etching pits are specified in the examples,

[0073] As an example, the electrolytic capacitor 4-1 is an electrolytic capacitor having a pit length of 27 [μm] or less. Electrolytic capacitors 4‑

[0074] The capacitor module 2 includes a case 6 . The housing 6 may be formed of an insulator or a surface-insulated conductor

[0079] Z1=ESR1+j{ωESL1-1 / ωC1}

[0080]=ESR1+jXs1...(1)

[0081] representation. jXs1 is the combined impedance of the inductive and capacitive components.

[0083] Z2=ESR2+j{ωESL2−1 / ωC2}

[0084]=ESR2+jXs2...(2)

[0085] representation. jXs2 is the combined impedance of the inductive and capacitive components.

[0087] A of FIG. 2 shows a filter circuit using the capacitor module 2. ...

Embodiment 1

[0196] The capacitor element of Example 1 in which the anode foil used the electrode foil with the pit length of the etching pit = 27 [μm] was produced.

[0197] As the electrode foil on the anode side, aluminum foil of size=20[mm]×20[mm] and foil thickness=125[μm] was used as the anode

[0199] As the electrode foil on the cathode side, aluminum foil of size=30[mm]×25[mm] and foil thickness=about 20[μm] was used as

[0200] The necks were mounted with silicon-coated aluminum leads to the anode and cathode foils, using 30 [mm] x 25 [mm] made of cowhide

[0201]

[0205] In this measurement 1, the electrostatic capacitances of the capacitor elements of Example 1 and Comparative Examples 1 to 4 were measured. in this measurement

[0207] As shown in FIGS. 13 to 18 , in the low frequency region of less than 10 [kHz], the electrostatic capacitance increases according to the length of the etching pit

[0208] At a high frequency of 100 [kHz], the electrostatic capacitance was Example ...

Embodiment 2

[0217] In the case of etching pit length = 6 [μm], the electrostatic capacitance does not change at a frequency of 1 [Hz] to 100 [kHz]

[0219] In the case of etching pit length=27 [μm] (etching pit length=2.25 times of 12 [μm]), frequency=100

[0220] Thus, in the case of etching pit length = 12 [μm] or more and 20 [μm] or less, the static caused by the etching pit length

[0222] In each of Examples 1 to 4, the case where a current of frequency = 100 [kHz] is passed has been described, but the present invention

[0227] According to this embodiment, the following effects can be obtained.

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Abstract

At least two electrolytic capacitors (4-1, 4-2) having etching pits formed on electrode foils are provided, and at least two electrolytic capacitors (4-1, 4-2) having different lengths of the etching pits are connected in parallel, the The number of settings is the same or different. The electrolytic capacitors ( 4 - 1 , 4 - 2 ) are electrolytic capacitors having an etching pit length of 27 [μm] or less, or electrolytic capacitors having an etching pit length exceeding 27 [μm]. Thereby, the performance of the electrolytic capacitor in the high-frequency region is improved, the capacitance drop rate in the high-frequency region is suppressed, and the ripple current withstand capacity in the high-frequency region is increased.

Description

Electrolytic capacitor modules, filter circuits and power converters technical field [0001] The technology of the present invention relates to the modularization and electrical design of electrolytic capacitors specified by electrode foils of different etch pit lengths. road technology. Background technique [0002] In the conversion of direct current and alternating current power, a power converter that performs power conversion by switching, such as an inverter or a converter, is used. force converter. In this power converter, a filter including a capacitor is used to remove high-frequency components generated during switching. Regarding the capacitor used in this filter, it is known that a large-capacity capacitor with a large high-frequency loss and a small high-frequency loss The small-capacity capacitors are used in parallel (Patent Document 1). However, this patent document 1 describes only aluminum electrolytic capacitors The loss is large, and the use of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055H01G4/40H01G9/28H02M1/14
CPCH02M1/14H01G4/40H01G9/04H01G9/055H01G9/28H01G9/26H02M7/5387H02P27/06
Inventor 吉田敦
Owner NIPPON CHIMI CON CORP
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