Through the aluminum electrolytic capacitor is mainly composed of acathode (AL2O3 composition of oxide film), anode and electrolyte composition, the cathode with unidirectional conductivity, so use is not allowed to reverse, otherwise it will quickly damage, or even an explosion.The shell is usually positive or negative electrode. But in use cannot byripple current big, cannot work in pure AC circuit. In order to display theelectrolytic capacitor of large capacity, small volume, low price,manufacturers have introduced a bipolar (nonpolar) electrolytic capacitor.

It is equivalent to two with electrolytic capacitor is connected back to back,but it must be pointed out: cannot connect to replace a non-polar capacitorwith back-to-back two ordinary capacitor, for two reasons: one is thematching of two complete capacitor capacity is not easy (not only to see thehousing value two); two capacitors in series after the total loss TG δ =tg δ 1tg Delta 2. The equivalent series resistance increase exponentially, leading to capacitor temperature rapidly increased, and the interference to the circuit, and the signal is passed to the serious deformation, to make the circuit wor

Even the electrolytic capacitor nonpolar, also should choose the corresponding models in different situations. For example, the commontype is generally used in polarity conversion of DC or pulse DC circuit, such as color TV in the decoding circuit. This type of image production Beijing radio factory ten CD71 series aluminum Shanghai Tianhe capacitor factory production of electrolytic capacitors, type CD03 BP series are. A dividerspecial non-polar capacitor, it with the ordinary non polar capacitorcompared, with high precision, small loss, DC leakage of small, small amount of parasitic inductance, Wen Shengji low, through the large ripple current characteristics. Such as type CD94, ten Beijing radio factoryproduction of type CD70, eleven plant in Shanghai, Jilin radio elementelement production company CD71B belongs to this type of.

In addition to the above, there are S correction for non polar capacitor, thecapacitor in the TG δ low, has the advantages of impact resistance, through high current characteristics, such as type CD269, Shanghai Tianhe capacitor factory production of ten Beijing radio component factory in CD7 S, Jilin components CD71A series, this type is. In addition to pure AC start non polar capacitor, it also has the impact resistance, low temperature rise, low inductance and other characteristics, such as domestic CD60 series belongs to this type of

Non polar capacitor in foreign capacitor is also different markers, such as in the case with the "BP" or "NP" and other words, and use different code to express its characteristics, such as Japan respectively by D, P, S, J code is generally no pole type, frequency divider, TV S school start with, with.