无码人妻久久一区二区三区app,国产熟人av一二三区,国产亚洲精久久久久久无码77777,国产欧美综合一区二区三区

Hello! Welcome to the website of Dongguan Youchen Electronic Technology Co., Ltd.

Youchen Technology

Chip Capacitor/Electrolytic Capacitor/Ceramic Capacitor Supplier
18929295505
admin@dgyouchen.com
Current Page: Home > News > Industry news
News

Selection method and key points of aluminum Electrolytic capacitor

2022-03-26

The stability and reliability of circuit system performance are closely related to the parameters, grades, and quality of selected components. Designers should accurately propose specific requirements for component parameters based on the product application environment and electrical performance requirements, including nominal values, accuracy and error requirements, stability requirements, temperature range requirements, installation dimensions, and other closely related circuit performance requirements. Requirements. Among all passive components, aluminum Electrolytic capacitor has the highest failure rate, so selection is particularly important.

Key points for selection of aluminum Electrolytic capacitor: capacity, withstand voltage, temperature range, component packaging form and size, ripple current, ripple voltage, leakage current, ESR, dissipation factor, impedance/frequency characteristics, capacitor life, actual needs, performance and cost consideration. The Electronic Components Technology Network raised the problems encountered by investigation engineers in aluminum electrolytic selection and application, paying attention to withstand voltage, capacity, temperature Size and other parameters, and also pay attention to the influence of aluminum Electrolytic capacitor on the whole circuit. Stability issues.

Aluminum Electrolytic capacitor is a polar capacitor composed of etched high-purity aluminum foil as anode and thin paper or cloth soaked with electrolyte as cathode. Advantages: large capacity, high voltage resistance, low price Disadvantages: large leakage current, large error, poor stability, and rapid decline in service life with increasing temperature. Aluminum Electrolytic capacitor used in digital circuit is generally used for smoothing and filtering of power supply. In addition to well-known parameters such as capacity, withstand voltage, capacity error, operating temperature, and packaging size, there are also some important parameters related to capacitor quality, including loss angle. Tangent, leakage current, Equivalent series resistance ESR, allowable ripple current, service life, etc. These parameters are not marked on the outer skin of the finished product packaging, but are only reflected in the product specifications, but these parameters may be the performance of key circuits.

Capacity and rated working voltage

The capacity and withstand voltage marked on the aluminum Electrolytic capacitor body are very important. It is the most basic aspect of selecting capacitors. In the actual selection of capacitors, capacitors with larger capacities should be used in rapidly changing areas, but the larger the capacity, the better. Firstly, the larger the capacity, the higher the cost and volume. In addition, the larger the capacitor, the more charging current it has. The larger it is, the longer the charging time. These are all considered in practical application selection.

Rated working voltage: The maximum DC voltage that a capacitor can reliably operate for a long time within the specified working temperature range and can withstand. In AC circuits, it should be noted that the maximum value of the applied AC voltage cannot exceed the DC operating voltage value of the capacitor. The commonly used fixed capacitor working voltages are 6.3V, 10V, 16V, 25V, 50V, 63V, 100V, 2500V, 400V, 500V, 630V. The voltage that a capacitor must actually withstand in the circuit cannot exceed its withstand voltage value. In the filter circuit, the withstand voltage value of the capacitor should not be less than 1.42 times the RMS value of the AC.

Another issue to note is the issue of operating voltage margin, which usually exceeds 15%. For example, the rated voltage of a capacitor is 50V, but the surge voltage can reach up to 63V, but usually only the maximum voltage of 42V is applied. Allowing more margin to the rated voltage of capacitors can reduce internal resistance, reduce leakage current, reduce loss angle, and increase lifespan. Although it is said that the use of 50V aluminum Electrolytic capacitor with 48V working voltage will not cause problems in a short time, it can reduce the service life after long-term use.

Dielectric loss

The energy consumed by a capacitor under the action of an electric field is usually represented by the ratio of the reactive power of the capacitor, which is the tangent of the loss angle (in the equivalent circuit of the capacitor, the series equivalent resistance ESR is equal to the capacitance reactance 1/Ω c. It is called Tan Delta, where ESR is calculated at 120 Hz. Obviously, Tan Delta increases with the increase of measurement temperature and with the decrease of measurement temperature, depending on the measurement frequency). The larger the loss angle, the greater the loss of the capacitor. Capacitors with a larger loss angle are not suitable for high-frequency operation.

The dissipation factor (DF) exists in all capacitors, and sometimes the DF value is expressed as the loss angle tan δ。 The lower this parameter, the better. However, this parameter of aluminum Electrolytic capacitor is relatively high. The DF value is related to the temperature, capacity, voltage, frequency, etc. of capacitors of the same brand and series; When the capacity is the same, the higher the withstand voltage, the lower the DF value. In addition, the higher the temperature, the higher the DF value, and the higher the frequency, the higher the DF value.

aspect

The size is related to weight and pin type. The single end is of radial lead type, the screw is of locking screw type, and there is an aluminum Electrolytic capacitor chip. As for weight, the same capacity is voltage resistance, but comparing two different brands of capacitors, the weight is definitely different; The overall dimensions are more related to the shell design.

Generally speaking, capacitors with the same diameter and capacity can be replaced by capacitors with smaller heights, but mechanical interference must be considered when replacing capacitors with longer lengths.

Erythrocyte sedimentation rate

Due to its structure, capacitors will have various impedances and inductances. ESR Equivalent series resistance and ESL Equivalent series inductance are a pair of important parameters, which are the basis of capacitive reactance. Compared with larger external capacitors, capacitors with smaller Equivalent series resistance (ESR) can better absorb the peak (ripple) current during fast switching. Parallel use of capacitors with high ESR is more cost-effective. However, this requires a compromise between PCB area, device quantity, and cost.

Ripple current and ripple voltage

In some data, it is referred to as ripple current and ripple voltage, but it is actually ripple current NT, ripple voltage. This meaning refers to the ripple current/voltage value that a capacitor can withstand. The ripple voltage is equal to the product of the ripple current and ESR.

When the ripple current increases, even if the ESR remains constant, the ripple voltage will exponentially increase. In other words, as the ripple voltage increases, the ripple current also increases, which is why capacitors need to have a lower ESR value. After the ripple current is superimposed, heat is generated due to the Equivalent series resistance (ESR) in the capacitor, which will affect the service life of the capacitor. Usually, the ripple current and frequency are positive

Next Page:What are the components of high-voltage Electrolytic capacitor? What types are there?
Youchen Technology
Dongguan Youchen Electronic Technology Co., Ltd
Tel: 0769-85328400 8533526885336465
Fax: 0769-85308615
Email: admin@dgyouchen.com
Website: yzx.net.cn
Address: Floor 3, No. 7 Xinfeng Road, Shangsha Fourth Industrial Zone, Chang'an Town, Dongguan City, Guangdong Province
Yue ICP Bei No. 13008404
All rights reserved:Dongguan Youchen Electronic Technology Co., Ltd
In-line aluminum electrolytic capacitor manufacturer, SMT aluminum electrolytic capacitor manufacturer, direct sales, brand selection, model selection, price
Follow us:

Do you need our help? Welcome to leave your email!
18929295505  
2324774509
admin@dgyouchen.com
欧美人与动牲交片免费| 国产亚洲成av人片在线观黄桃| 97夜夜澡人人双人人人喊| 久久超碰97人人做人人爱| 亚洲人精品午夜射精日韩 | 亚洲av日韩精品久久久久久久| 激情综合婷婷色五月蜜桃| 亚洲香蕉成人av网站在线观看| 大地资源免费视频观看| 熟女少妇在线视频播放| 欧洲熟妇色xxxx欧美老妇| 欧美性受xxxx狂喷水| 国产精品亚洲αv天堂无码| 国产成人久久777777| 国模吧无码一区二区三区| 97久久精品人人澡人人爽| 粗了大了 整进去好爽视频| 福利100合集 在线播放| 精品久久亚洲中文无码| 亚洲经典千人经典日产| 久久久精品人妻一区二区三区蜜桃| 九色综合九色综合色鬼| 内射后入在线观看一区| 亚洲av无码一区二区三区电影| 香蕉人妻av久久久久天天| 久久er99热精品一区二区| 中文字幕+乱码+中文字幕一区| а√资源新版在线天堂| 亚洲国产美女精品久久久| 亚洲国产精品久久久久制服| 98色婷婷在线| 国产两女互慰高潮视频在线观看| 精品亚洲国产成人av| 精品国产乱码久久久久久郑州公司 | 麻豆tv入口在线看| 女人被做到高潮免费视频| 国产精品无码久久综合网| 男人把女人桶到爽爆的视频网站| 日本大片在线看黄a∨免费| 久久精品国产亚洲av麻豆蜜芽| 国产精品久久久久久无码|