Electrolytic capacitors

introduction

Electrolytic capacitors is a kind of capacitance, media are electrolyte, coating have positive and negative polarities, points, do not meet wrong. Capacitance, consisting of two metal extremely, intermediate clip has insulating materials (medium) constitutes.

characteristics

A: electrolytic capacitor characteristics of electric capacity of unit volume is very large, than other types of capacitor big decades to hundreds of times.

Capacitors features two: the rated capacity can be very big, can easily do even a few tens of u f f (but not and electric double layer capacitance than).

Capacitors characteristics than other kinds of three: with a landslide, because the electrolytic capacitors constituent materials are ordinary industrial materials, such as aluminum, etc. Manufacturing electrolytic capacitors equipment are also common industrial equipment, can mass production, the cost is relatively low. Common day fastens electrolytic capacitors in Chemi - Nippon con, Nichicon, Rubycon, Hitachi, Matsushita, Yadacon represented, Taiwan is capacitance criterion with ELECT, OST, TAICON, TEAPO, CAPXON represented, euramerican ELEBASIC, with ITEDCON, BHC, KENDEIL, CDE, EVERALPHA.

The principle

Capacitors is usually composed of metal foil (aluminum/tantalum) as the positive electrode, metallic foil insulation oxidation layer (alumina/tantalum oxide) as dielectric, five electrolytic capacitors with its positive electrode divided into aluminum electrolytic capacitors and tantalum capacitors. Aluminum electrolytic capacitor negative electrode by soaking liquid (liquid electrolyte) electrolyte of paper/thin film or electrolyte polymer composition, Tantalum capacitors of negative electrode usually adopts manganese dioxide. Because all with electrolytes as negative electrode (note and electrolytic capacitor dielectric distinguish), hence its name.

application

Have polarity electrolytic capacitors usually in the power circuit or intermediate frequency and low frequency circuit power filtering, plays back the decoupling, signal coupling and time constant setting, lie between dc functions. Generally cannot be used in communication power supply circuit, in dc power circuit of filter capacitance when using, its anode (positive) should with the power supply voltage of the positive DuanXiang connection, cathode (anode) and the power source voltage anode DuanXiang connection, cannot meet the rebel, otherwise it will damage capacitors.

Non polar capacitor commonly used in speaker separate frequency decoder circuit, TV S correct circuit and single-phase motor start-up circuit.

Capacitors are widely used in household electric appliances and various electronic product, its capacity range is larger, typically 1 ~ 1000 u F, rated voltage range of 6.3 ~ 450V. Its defect is medium loss, capacity much error (maximum allowable deviation is + 100%, - 20%), high temperature resistant the gender is poorer, the storage time is long easy failure.