詳細信息
公司名字:東莞市科尼盛電子有限公司
英文名: Dong Guan Ke Ni Sheng Electronic CO.,LTD）
地址：廣東省東莞市東坑鎮(zhèn)黃麻嶺鳳凰路南4號
電話: (86)769-33287982 33287983 33256671 33256670
傳真: (86)769-81017460 83861559
阿里旺旺：knscha
QQ：1747285267
手機：13662958961
聯(lián)系人: 業(yè)務(wù)代表 薛強
http://www.knscha.com
alibaba網(wǎng)址：http://www.knscha.cn.alibaba.com
東莞市科尼盛電子有限公司堅持顧客至上，綠色環(huán)保，品質(zhì)第一的經(jīng)營理念。Dong Guan Ke Ni Sheng Electronic CO.,LTD）adhere to the customer first, green environmental protection, quality first business philosophy
LED吊燈專用鋁電解電容4.7UF/450V 10*12MM鋁電解電容
電解電容在電路中的作用
1，濾波作用，在電源電路中，整流電路將交流變成脈動的直流，而在整流電路之后接入一個較大容量的電解電容，利用其充放電特性，使整流后的脈動直流電壓變成相對比較穩(wěn)定的直流電壓。在實際中，為了防止電路各部分供電電壓因負載變化而產(chǎn)生變化，所以在電源的輸出端及負載的電源輸入端一般接有數(shù)十至數(shù)百微法的電解電容．由于大容量的電解電容一般具有一定的電感，對高頻及脈沖干擾信號不能有效地濾除，故在其兩端并聯(lián)了一只容量為0.001--0.lpF的電容，以濾除高頻及脈沖干擾．
2，耦合作用：在低頻信號的傳遞與放大過程中，為防止前后兩級電路的靜態(tài)工作點相互影響，常采用電容藕合．為了防止信號中韻低頻分量損失過大，一般總采用容量較大的電解電容。
二、電解電容的判斷方法
電解電容常見的故障有，容量減少，容量消失、擊穿短路及漏電，其中容量變化是因電解電容在使用或放置過程中其內(nèi)部的電解液逐漸干涸引起，而擊穿與漏電一般為所加的電壓過高或本身質(zhì)量不佳引起。判斷電源電容的好壞一般采用萬用表的電阻檔進行測量．具體方法為：將電容兩管腳短路進行放電，用萬用表的黑表筆接電解電容的正極。紅表筆接負極(對指針式萬用表，用數(shù)字式萬用表測量時表筆互調(diào))，正常時表針應先向電阻小的方向擺動，然后逐漸返回直至無窮大處。表針的擺動幅度越大或返回的速度越慢，說明電容的容量越大，反之則說明電容的容量越?。绫磲樦冈谥虚g某處不再變化，說明此電容漏電，如電阻指示值很小或為零，則表明此電容已擊穿短路．因萬用表使用的電池電壓一般很低，所以在測量低耐壓的電容時比較準確，而當電容的耐壓較高時，打時盡管測量正常，但加上高壓時則有可能發(fā)生漏電或擊穿現(xiàn)象．
三、電解電容的使用注意事項
1、電解電容由于有正負極性，因此在電路中使用時不能顛倒聯(lián)接。在電源電路中，輸出正電壓時電解電容的正極接電源輸出端，負極接地，輸出負電壓時則負極接輸出端，正極接地．當電源電路中的濾波電容極性接反時，因電容的濾波作用大大降低，一方面引起電源輸出電壓波動，另一方面又因反向通電使此時相當于一個電阻的電解電容發(fā)熱．當反向電壓超過某值時，電容的反向漏電電阻將變得很小，這樣通電工作不久，即可使電容因過熱而炸裂損壞．
2．加在電解電容兩端的電壓不能超過其允許工作電壓，在設(shè)計實際電路時應根據(jù)具體情況留有一定的余量，在設(shè)計穩(wěn)壓電源的濾波電容時，如果交流電源電壓為220~時變壓器次級的整流電壓可達22V，此時選擇耐壓為25V的電解電容一般可以滿足要求．但是，假如交流電源電壓波動很大且有可能上升到250V以上時，最好選擇耐壓30V以上的電解電容。
3，電解電容在電路中不應靠近大功率發(fā)熱元件，以防因受熱而使電解液加速干涸．
4、對于有正負極性的信號的濾波，可采取兩個電解電容同極性串聯(lián)的方法，當作一個無極性的電容。Electrolytic capacitors in the circuit in the role of
1, filtering effect, in a power supply circuit, rectifier circuit to the AC into pulsating DC, while in the rectifier circuit after access to a larger capacity electrolytic capacitor, the charge and discharge characteristics, make rectified pulsating DC voltage into a relatively stable DC voltage.In practice, in order to prevent the each part of the circuit power supply voltage due to the load change and produce change, so the output end of the power supply and the load of the power input end is generally connected with tens to hundreds of micro method for the electrolytic capacitor. Due to the large capacity electrolytic capacitor has certain inductance, high frequency and impulse interference signals can effectively filter therefore, in the parallel connected with both ends of a capacity of 0.001--0.lpF capacitor, to filter out high frequency and pulse interference.
2, coupling effect: in the low frequency signal transmission and the amplification process, in order to prevent the before and after the two stage circuit static working point of mutual influence, often using capacitive coupling. In order to prevent signal in the rhyme low-frequency loss is too large, generally the larger capacity of electrolytic capacitors.
In two, the judging method of electrolytic capacitor
Electrolytic capacitor common fault, reduced capacity, capacity disappear, short circuit breakdown and leakage, in which capacity change for electrolytic capacitor in use or placed in the process of its internal electrolyte dry up gradually, and breakdown and leakage for the voltage too high or itself caused by poor quality.Judging power capacitor is generally use a multimeter to measure resistance profile. The concrete method is: will the capacitance of the two pin is shorted to discharge, with a multimeter the black table document connected electrolytic capacitor anode.The red pen is connected with the negative pole (the pointer multimeter, using the digital multimeter measuring pen intermodulation), normal hand shall first apply to small resistance direction swing, then gradually returned to infinite big.Hands swinging larger amplitude or return more slowly, that the capacity of the capacitor is more big, otherwise, the capacity of the capacitor is smaller. As hands in somewhere in the middle of no change, the capacitor leakage, such as resistance indicator values are very small or zero, it indicates that the capacitor has breakdown short circuit for million. Use the table using the battery voltage is generally very low, so the measurement of low voltage capacitor is more accurate, and when the capacitor voltage is high, although measurements of the normal play, but coupled with high pressure is possible leakage or breakdown phenomenon.
Three, note the use of electrolytic capacitor
1, electrolytic capacitors with positive and negative polarity, thus used in the circuit can not be reversed.In a power supply circuit, output positive voltage electrolytic capacitor anode is connected to the power output end, negative ground, output negative voltage output end is negative, positive ground. When the power supply circuit of the filter capacitor polarity reverse connection, due to capacitor filtering effect is greatly reduced, on one hand the power supply output voltage wave, on the other hand, because of the inverse power make it the equivalent of a resistance electrolytic capacitor heating. When the reverse voltage exceeds a certain value, the capacitor leakage resistance will become very small, so the electric work soon, can make the capacitance due to overheat and burst damage.
2 plus in the electrolytic capacitor voltage should not exceed the allowable working voltage, in the design of practical circuit should be based on specific circumstances leave some margin, in the design of regulated power supply filter capacitor, if AC power is 220~ voltage transformer secondary rectifier voltage up to 22V, the selection pressure for 25V electrolytic capacitor can generally be to meet the requirements. However, if AC power supply voltage fluctuation and is likely to rise to more than 250V, the best choice of pressure above 30V electrolytic capacitor.
In 3, the electrolytic capacitors in the circuit should not close to the high power heating elements, to prevent the electrolyte accelerated by heat to dry up.
4, the positive and negative polarity signal filtering, can take two electrolytic capacitors homopolar series method, as a non polar capacitor.