Electrolytic capacitor with self discharge function

Abstract

The invention discloses an electrolytic capacitor with a self discharge function. The electrolytic capacitor comprises an aluminum shell, and a capacitor element and a chip resistor, which are arranged in the shell, wherein a capacitor core of the capacitor element comprises a porous tantalum powder agglomerate positive electrode matrix formed by briquetting tantalum metal powder and sintering the same at a high temperature, an effective area within a unit volume thereof is large, and a use temperature range is wide; a TaO5 film is formed on the surface of the tantalum powder agglomerate positive electrode matrix by positive electrode oxidation, the dielectric constant of the TaO5 film is larger than that of an aluminum oxide film, so under the same withstand voltage and capacitance condition, the volume of a tantalum electrolytic capacitor is much smaller than that of an aluminum electrolytic capacitor, so an ultra-small element can be made, moreover, the performance is stable, and good electrical performance can be still kept under long-term work. After the power supply is cut off, the chip resistor can discharge the electricity stored in the capacitor core within a very short period of time and reduce the voltage of the capacitor core, so that the danger of electric shock of a human body after the touch of the human body due to the electrification of the capacitor core is avoided, and thus the safety is high.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an electrolytic capacitor with a self-discharging function. Background technique [0002] A capacitor, often referred to simply as a capacitor, is a device that holds charges. For electrolytic capacitors, it generally refers to aluminum electrolytic capacitors, which use a thin oxide film as the dielectric material and aluminum as the electrode material. Since the dielectric material can be made very thin, a relatively large capacitance can be achieved compared to the volume of the capacitor. However, even when the power supply of the capacitor is cut off, the voltage stored in the capacitor core still exists, which is prone to the danger of electric shock to the human body. Contents of the invention [0003] The main purpose of the present invention is to provide an electrolytic capacitor with small volume, large capacity and safe use with self-discharging function. [0...

AI Technical Summary

Problems solved by technology

However, even when the power supply of the capacitor is cut off, the voltage stored in the capacitor core still exists, which is prone to the danger of electric shock to the human body

Images