Aluminum electrolytic capacitor aluminum electrolytic capacitor manufacturer ranking

1. Detailed information of electrolytic capacitors. 2. Why does the capacity of aluminum electrolytic capacitors decay? The main reasons for the decrease of capacity and the increase of loss 3. How big is the profit of aluminum electrolytic capacitor 4. The use of aluminum electrolytic capacitor 5. What are the main parameters of aluminum electrolytic capacitor? Detailed information of electrolytic capacitor

electrolytic capacitor is a kind of capacitor, the metal foil is the positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) close to the positive electrode is the dielectric, and the cathode is composed of conductive material, electrolyte (electrolyte can be liquid or solid) and other materials. Electrolyte is the main part of the cathode, so electrolytic capacitor is named. At the same time, the positive and negative electrolytic capacitors must not be wrong. Aluminum electrolytic capacitors can be divided into four categories: lead aluminum electrolytic capacitors; Horn aluminum electrolytic capacitor; Bolt aluminum electrolytic capacitor; Solid aluminum electrolytic capacitor.

basic introduction

Chinese name: electrolytic capacitor mbth: electrolytic capacitor category: capacitor application scope: physical characteristics: introduction of capacitor, types, characteristics, principles, application, development, materials, technology, structure, prospect, introduction: electrolytic capacitor is a kind of capacitor, and metal foil is positive electrode (aluminum or tantalum). The oxide film (alumina or tantalum pentoxide) of the metal close to the anode is a dielectric, and the cathode is composed of conductive material, electrolyte (electrolyte can be liquid or solid) and other materials. Because the electrolyte is the main part of the cathode, the electrolytic capacitor is named. At the same time, the positive and negative electrolytic capacitors must not be wrong. Types of aluminum electrolytic capacitors can be divided into four categories: 1. Lead-wire aluminum electrolytic capacitors; 2. Horn aluminum electrolytic capacitor; 3. Bolted aluminum electrolytic capacitor; 4. Solid aluminum electrolytic capacitor. Features 1. The capacitance per unit volume is very large, which is dozens to hundreds of times larger than other types of capacitors. 2. The rated capacity can be very large, and it can easily be tens of thousands of μf or even several F (but it cannot be compared with the electric double layer capacitance). 3. The price has an overwhelming advantage over other kinds, because the constituent materials of electrolytic capacitors are common industrial materials, such as aluminum and so on. The equipment for manufacturing electrolytic capacitors is also common industrial equipment, which can be produced on a large scale and the cost is relatively low. Principle Electrolytic capacitors are usually made of metal foil (aluminum/tantalum) as the positive electrode, and the insulating oxide layer of metal foil (aluminum oxide/tantalum pentoxide) as the dielectric. Electrolytic capacitors are divided into aluminum electrolytic capacitors and tantalum electrolytic capacitors according to the difference of their positive electrodes. The negative electrode of aluminum electrolytic capacitor is composed of thin paper/film or electrolyte polymer soaked in electrolyte liquid (liquid electrolyte); Manganese dioxide is usually used as the negative electrode of tantalum electrolytic capacitor. Electrolyte is used as the negative electrode (be careful to distinguish it from dielectric), so electrolytic capacitor is named. The application of polar electrolytic capacitors usually plays the roles of power supply filtering, decoupling, signal coupling, time constant setting and DC isolation in power supply circuits or intermediate frequency and low frequency circuits. Generally, it can't be used in AC power supply circuit. When it is used as a filter capacitor in DC power supply circuit, its anode (positive pole) should be connected to the positive terminal of power supply voltage, and its cathode (negative pole) should be connected to the negative terminal of power supply voltage, so it can't be reversed, otherwise it will damage the capacitor. Non-polar electrolytic capacitor is usually used in speaker frequency divider circuit, TV S correction circuit and starting circuit of single-phase motor. Electrolytic capacitors are widely used in household appliances and various electronic products, with a large capacity range, generally 1~33μF and rated working voltage range of 6.3~7V V. Its disadvantages are large dielectric loss and capacity error (the maximum allowable deviation is +1% and -2%), poor high temperature resistance and easy failure after long storage time. Pay attention to the polarity of the electrolytic capacitor, and observe that "-"is the negative pole and "+"is the positive pole on the side of the electrolytic capacitor. If the positive and negative poles are not marked on the electrolytic capacitor, it can also be judged according to the length of its pins, and the long pin is the positive pole and the short pin is the negative pole. Development Status In terms of output, aluminum electrolytic capacitors occupy the second place among capacitors. This kind of capacitor was originally a general DC capacitor, but now it has developed from DC to AC, from low temperature to high temperature, from low voltage to high voltage, from general type to special type, from general structure to chip, flat and book structure. Its upper limit capacity has been extended to about 4F, its service frequency has reached 3kHz, its working temperature range has reached-55℃-125℃, and some even reached 15℃, and its rated voltage has reached 7V V.. In a word, the development of aluminum electrolytic capacitors is more and more extensive. The basis of these developments is as follows: the aluminum foil currently used in materials is very elegant in composition and structure. High purity is no longer required, for example, for anode foil, its purity is required to be high enough. In order to improve the initial corrosion points, mechanical strength and the performance of dielectric oxide film, the foil should contain some impurities properly, and some of them use alloy foil. Structurally, for low-pressure foil, cubic structure is not required to account for a large proportion, but for high-pressure foil, it is required to account for more than 8%-9%. For cathode foil, in order to improve its specific capacity, alloy aluminum foil with irregular grain orientation and certain impurity content is required. Working electrolyte consists of three components, namely, solvent, solute and additives. For example, electrolyte that has been used for a long time, its components are ethylene glycol, glycerol, boric acid and ammonia water. Due to the development of aluminum electrolytic capacitors, this electrolyte is far from meeting the requirements, so many new electrolytes have been produced to reduce the working temperature range of capacitors (such as-55℃-125℃). The formulation principles of these new electrolytes are as follows: ① Mix two solvents to achieve complementarity. ② Two kinds of weak acids are used to provide the required two kinds of anion groups. (3) Adding alkali, such as organic amine, to adjust the pH value and flashover voltage of the electrolyte and change its resistivity. (4) Additives to improve the characteristics of electrolyte, such as phosphoric acid or its salt to prevent the hydration of aluminum oxide film, dinitrobenzene to absorb hydrogen, and ethylene oxide to improve the flashover voltage of electrolyte. In addition to the mechanization and automation of production, the progress of aluminum electrolytic capacitor technology is mainly two processes of corrosion phase empowerment. The corrosion coefficient of aluminum foil is not only very high (low voltage capacitor foil has reached 1, high voltage capacitor foil has reached 25), but also aluminum foil with different pit shapes can be corroded according to the performance requirements of capacitors. The etching process is a dynamic balance process of the type, concentration, temperature, composition, structure, surface state of the original foil, foil speed during the etching process, power supply type, waveform, frequency and voltage. The problem is how to get the best dynamic balance and how to determine the most transmission balance according to the requirements. Therefore, the corrosion process can not be said to have reached the best state. At present, the high-quality dielectric oxide films can be made by the existing energizing process, and different dielectric oxide films can be made according to different requirements, for example, γ and γ' crystalline alumina films are made for DC capacitors, and amorphous films are made for AC capacitors. The biggest progress of the empowerment process is that aluminum hydroxide film can be transformed into dielectric aluminum oxide film, and a waterproof layer can be formed on its surface. In addition, it can also eliminate the defects and cracks of the dielectric film. Structurally, the structure of aluminum electrolytic capacitors has been diversified, except for the above-mentioned liquid aluminum electrolytic capacitors, there are also solid aluminum electrolytic capacitors. There are two main structural forms, one is foil wound, the other is aluminum powder sintered porous block, and the solid electrolyte used is mainly MnO2. The structure of aluminum electrolytic capacitor has been diversified, such as double anode structure, counter cathode structure, book structure, triangle structure and chip structure. Among them, the appearance of chip aluminum electrolytic capacitor is another progress of aluminum electrolytic capacitor. Because if there is no aluminum foil with high specific volume, high-temperature resistant electrolyte, excellent sealing structure and fine processing technology, it is difficult to make a chip aluminum electrolytic capacitor that meets the requirements, and its chip rate is still at a relatively low level. Looking forward to the YDK-7V capacitor developed by capsun and TDK, the material of which is 82V, has been used in the audio system of capsun Group in Japan, which is of epoch-making significance, which means that the 537V rectified from 38V is no longer connected in series with two 4V capacitors. In the future, the performance of aluminum electrolytic capacitors will further develop with the progress of science and technology. The normal capacitance volume of 7V1uf is usually 35*8-1MM or 5*8-96MM, and the price is about $22. Set for the world's top capsun, YAMAHA audio is widely exported to high-end hotels in Europe and America. A set of audio with a price of $1,2 to millions of dollars is expensive, and many sets are used in aristocratic families and hotels. Supercapacitors with small volume and large capacity are also being gradually developed. The test method and test conditions of leakage current of aluminum electrolytic capacitor are as follows: at 25℃, the measured capacitor is connected with a 1Ω protective resistor in series to the rated voltage, and the leakage current is measured. After the voltage is applied for 5 min, the leakage current does not exceed the maximum value in the manual. Small-capacity aluminum electrolytic capacitor can use the test result of 1min, while large-capacity aluminum electrolytic capacitor will need a longer test time. From the characteristic curve, it can be seen that the current will infinitely approach the final "leakage current" value-the current value needed to replenish alumina medium. Loss factor (DF) of electrolytic capacitor can be understood as reactive power of electrolytic capacitor and active power of equivalent series resistance (ESR) under the excitation of alternating current. Obviously, this is the ratio of capacitive reactance to equivalent series resistance (ESR). The RC circuit in AC circuit, and this ratio is very similar to the tangent function, which is the opposite side of the trigonometric function. Therefore, the loss factor (DF) of electrolytic capacitors is also called loss tangent in many technical documents. The voltage indexes of aluminum electrolytic capacitor mainly include rated DC voltage, rated surge voltage, instantaneous overvoltage and reverse voltage. Rated DC voltage VR is the continuous working voltage allowed by the capacitor within the rated temperature range, which includes the sum of DC voltage and pulsating voltage or continuous pulse voltage between the two electrodes of the capacitor. Usually, the rated voltage of tantalum capacitor is indicated on the capacitor surface. Usually, the rated voltage ≤1V T491B17M4AT is a "low voltage" tantalum capacitor, while the rated voltage ≥15V is a "high voltage" capacitor. Why does the capacity of aluminum electrolytic capacitor decay? The main reason for the decrease of capacity and the increase of loss

Aluminum electrolytic capacitors are widely used in consumer electronics, industrial control, communication products, computers and peripheral products, instruments and meters, automobile industry and other products, and are one of the irreplaceable main members of the capacitor family. The basic structure of aluminum electrolytic capacitor is that there is an aluminum shell outside, and the sealed aluminum shell is filled with electronic aluminum foil, electrolytic paper, electrolyte and so on, and two positive and negative electrodes are led out. Due to the complexity of the structure and manufacturing process of aluminum electrolytic capacitor, some problems will inevitably occur in the process of production, storage and use, such as capacity attenuation and loss increase.

It is generally believed that there are three main reasons for the capacity attenuation of aluminum electrolytic capacitors:

1. The poor contact between the guide pin and the aluminum foil leads to the increase of contact resistance, which leads to the capacity attenuation, such as excessive riveting thickness, excessive aluminum foil powder on the anode, oiling and lubrication at the rivet pin and the rivet hole, etc.

2. insufficient electrolyte impregnated in anode foil or cathode foil leads to the inability to completely extract the capacity, which leads to the capacity attenuation, such as high electrolyte viscosity, poor permeability, incomplete impregnation or too long spin-drying time, poor sealing performance, evaporation or loss of electrolyte, etc.

3. Poor control of the process parameters of product aging leads to the thickening of the oxide film of anode or cathode foil, which leads to capacity attenuation, such as excessive aging voltage or temperature, reverse voltage during aging due to operational errors, etc.

The capacity of aluminum electrolytic capacitor decreased significantly in the later period of use, mainly due to the more electrolyte loss, the increased viscosity of electrolytic solution, and the increased resistivity due to the increased viscosity, which increased the equivalent series resistance of working electrolyte, and also led to an obvious increase in capacitor loss. The ability of electrolyte with increased viscosity to repair the surface of oxide film decreases, which reduces the effective area of capacitor plate and causes the capacity of aluminum electrolytic capacitor to drop sharply, which is also the performance that the service life of capacitor is coming to an end. Then, the low-temperature performance of the working electrolyte in some systems is not good. If the viscosity is too high, the equivalent series resistance will surge, which will increase the loss and reduce the capacitance, which will easily lead to early failure in cold work. How big is the profit of aluminum electrolytic capacitor

The profit of aluminum electrolytic capacitor is 75 million. According to the relevant information, the profit of aluminum electrolysis is 75 million, and the capacitor chemicals of Wanke Company mainly include aluminum electrolytic capacitor chemicals, solid polymer capacitor chemicals and super capacitor chemicals. Usage of aluminum electrolytic capacitor

About the usage of aluminum electrolytic capacitor, Shandong Hongbao Electronics Co., Ltd. will introduce the usage of aluminum electrolytic capacitor to you.

the use of aluminum electrolytic capacitor and its production process, points for attention: An aluminum electrolytic capacitor is a capacitor made of an aluminum cylinder as a negative electrode, which is filled with liquid electrolyte, and a bent aluminum strip is inserted as a positive electrode.

capacitor is a kind of energy storage element, which is used for tuning, filtering, coupling, bypass, energy conversion and delay in circuits. Capacitors are usually called capacitors.

Types and uses of aluminum electrolytic capacitors

1. According to the structure, there are three categories: fixed capacitors, variable capacitors and trimming capacitors.

2. According to electrolyte classification: organic dielectric capacitor, inorganic dielectric capacitor, electrolytic capacitor and air dielectric capacitor.

3. It can be divided into high-frequency bypass, low-frequency bypass, filtering, tuning, high-frequency coupling, low-frequency coupling, and small capacitors according to the purposes.

4. According to the different manufacturing materials, it can be divided into: ceramic capacitors, polyester capacitors, electrolytic capacitors, etc.

5. High-frequency bypass: ceramic capacitors, mica capacitors, glass film capacitors, polyester capacitors and glass glaze capacitors

6. Low-frequency bypass: paper capacitors, ceramic capacitors, aluminum electrolytic capacitors and polyester capacitors.

7. filtering: aluminum electrolytic capacitor, paper dielectric capacitor, composite paper dielectric capacitor and liquid tantalum capacitor.

8. Tuning: ceramic capacitor, mica capacitor, glass film capacitor and polystyrene capacitor

9. Low coupling: paper capacitor, ceramic capacitor, aluminum electrolytic capacitor, polyester capacitor and solid tantalum capacitor.

1. Small capacitors: metallized paper capacitors, ceramic capacitors, aluminum electrolytic capacitors, solid tantalum capacitors, glass

glaze capacitors, metallized polyester capacitors and mica capacitors. What are the main parameters of aluminum electrolytic capacitor?

Aluminum electrolytic capacitor is a polar capacitor, which uses etched aluminum foil as anode and tissue paper or cloth impregnated with electrolyte as cathode. \xd\ \xd\ Advantages of aluminum electrolytic capacitor: large capacity, high withstand voltage, and low price \xd\ \xd\ Disadvantages: large leakage current, large error, poor stability, and rapid decline of life with the increase of temperature \xd\ \xd\ Aluminum electrolytic capacitors used in digital circuits are generally used for smooth filtering of power supply, except for capacity, withstand voltage, and so on. These parameters are not marked on the finished product.