Do You Consider the Current Status of Aluminum Capacitors ?

[maryzhu]

I guess almost everyone must have seen the aluminum capacitors, but have you considered the current status of aluminum capacitors ?

Aluminum capacitors, also known as capacitors, is an energy storage element, its structure can be divided into fixed capacitors, semi-variable capacitors, variable capacitors three, it is characterized by large capacity, but large leakage, large error, poor stability , Often used for AC bypass and filtering, when the request is not high also used for signal coupling. Aluminum capacitors can be divided into four categories: lead-type aluminum capacitors; horn-type aluminum capacitors; bolt-type aluminum capacitors; solid-state aluminum capacitors.

I have one aluminum capacitor,http://www.kynix.com/Detail/3660/EMVA10 ... MF55G.html, but I have been thinking about the current status of aluminum capacitors. Today, I would like to discuss with you what is the current status of aluminum capacitors.

Here are my following understandings:

The core of the aluminum capacitor is composed of anodic aluminum foil, electrolytic paper, cathodic aluminum foil and paper. The core is impregnated with electrolyte and sealed with aluminum shell and plastic cover to form a capacitor. Compared with other types of capacitors, aluminum capacitors in the structure to show the following obvious features:

(1) The working medium of the aluminum capacitor generates an extremely thin layer of aluminum oxide (Al2O3) on the surface of the aluminum foil by anodic oxidation, and the anode of the oxide dielectric layer and the capacitor is combined into a complete system, Interdependent, can not be independent of each other; what we usually call capacitors, their electrodes and dielectrics are independent of each other.

(2) Aluminum anode capacitor is the surface of the formation of Al2O3 dielectric layer of aluminum foil, the cathode is not what we used to think that the negative foil, but the aluminum capacitor.
(3) The negative foil serves as an electrical lead in the capacitor. Since the solution as the cathode of the aluminum capacitor can not be directly connected to the external circuit, it is necessary to form an electrical path through another metal electrode and other parts of the circuit.
(4) Aluminum foil for aluminum capacitors, cathodic aluminum foils are usually corroded aluminum foil, and the actual surface area is much larger than its apparent surface area, which is also a reason for the fact that aluminum capacitors usually have large capacitance. Due to the use of aluminum foil with a large number of tiny holes, liquid electrolytes are usually required to make more efficient use of their actual electrode area.

Source: transmission and distribution equipment network.

(5) Since the dielectric oxide film of the aluminum capacitor is obtained by anodic oxidation and its thickness is proportional to the voltage applied by the anodic oxidation, the thickness of the dielectric layer of the aluminum capacitor can be artificially Precise control.

Aluminum capacitor performance characteristics Compared with other types of capacitors, aluminum capacitors in the performance of the advantages of the following aspects:

(1) The capacity per unit volume is particularly large. The lower the operating voltage, this feature is more prominent, therefore, especially to adapt to the miniaturization of capacitors and large capacity. For example, the specific capacity of the CD26 low-pressure, high-capacity aluminum capacitor is about 300 μF / cm3, and the specific capacity of other low-pressure ceramic capacitors of metallized paper dielectrics that are also featured in miniaturization is generally not more than 2 μF / cm3.

(2) Aluminum capacitors in the course of work with "self-healing" features. The so-called "self-healing" feature refers to the dielectric oxide film defects or defects in the capacitor work process can be repaired at any time to restore its insulation should have the ability to avoid lead to dielectric avalanche breakdown.

(3) Aluminum oxide capacitors dielectric oxide film can withstand very high electric field strength. In the operation of aluminum capacitors, the dielectric oxide film to bear the electric field strength of about 600kV / mm, this value is more than 30 times the paper capacitor.

(4) Aluminum capacitors can get a high rated capacity. Low-voltage aluminum capacitors can be very easy to get thousands or even tens of thousands of micro-static capacity. In general, the power supply filter, AC bypass and other uses the required capacitor can only use capacitors.

Now, the current status of aluminum capacitors is larger and larger. At present, the global aluminum capacitor supply market is becoming more and more mature, mainly in Japan, mainland China, Taiwan and South Korea and other regions. In recent years, the industry's overall competitive landscape, Japan's electrolytic capacitor production began to shrink at reduced production, replaced by South Korean companies, Taiwan enterprises, mainland China enterprises. Aluminum capacitors This product before 1978, in mainland China was considered high-tech products, and after 30 years of development, aluminum capacitors for this product for domestic aluminum capacitor manufacturers do not belong to high-tech Product. From a technical point of view, some of the well-known domestic brands produced by the capacitor has been able to replace foreign capacitors.

According to "2013-2017 China Aluminum Capacitor Industry Development Prospects and Investment Forecast Analysis Report" data show that in 2010 the global output value of 5.2 billion US dollars, the average growth rate of the past seven years was 4% -5%, is expected to reach in 2012 $ 5.5 billion in market size, to about $ 6 billion by 2015. From the global aluminum capacitor delivery period, since 2010 there has been a clear extension of the phenomenon, which largely implies that the industry is entering the fast-growing channel.

In recent years, overseas well-known aluminum capacitor manufacturers have come to mainland China to invest and build factories. Aluminum capacitors in the traditional growth of the field of consumer electronics at the same time, its application areas with the structural transformation and technological progress in energy-saving lamps, frequency converters, new energy and many other emerging areas to expand. National "Twelfth Five-Year Plan" clearly put forward: to promote large and medium-sized cities in transportation, communications, power supply, water supply and drainage and other infrastructure integration and network development. The development of these emerging areas will expand the demand for new materials products space, and as a national key development of China's aluminum capacitor industry will also be a huge space for development.

Aluminum capacitors in the basic role of electronic circuits generally summarized as: AC, blocking DC, with filtering, bypass, coupling and fast charge and discharge functions, and has a small size, storage power, cost-effective features. With the advancement of modern technology and the continuous improvement of capacitor performance, aluminum electrolytic capacitors have been widely used in consumer electronics, communications products, computers and peripheral products, new energy, automation, automotive, optoelectronic products, high-speed rail and aviation and military Equipment and so on.

Aluminum capacitors according to the different forms of capacitors can be divided into liquid aluminum capacitors and solid capacitors; according to the different ways to lead into lead, solder type, solder type, bolt type, patch type five. According to the application of different aluminum capacitors are divided into consumer, industrial and special applications of aluminum capacitors, consumer aluminum capacitors are mainly used for energy-efficient lighting, television sets, monitors, computers and air conditioning and other consumer markets; industrial aluminum Capacitors are mainly used in industrial and communications power supply, professional inverter, CNC and servo systems, wind power and automotive and other industrial fields; special aluminum capacitors are mainly used in military, aerospace and other special areas.

Those are just my understandings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated.

May someone would like to help ?

thanks in advance.