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Talk about the aluminum electrolytic capacitor selection guide

　　Aluminum electrolytic capacitor volume is relatively large,relatively large series resistance, inductance, sensitive to temperature. It is suitable for big changes in its temperature, working frequency is not high (less than 25kHz) situations, and can be used for low frequency filtering (in parallel filtering high frequency when the electrolytic capacitor low frequency difference). Aluminumelectrolytic capacitor has a polarity, the installation must ensure that the correct polarity, otherwise there is a danger of explosion.
　　Compared with the aluminum electrolytic capacitor, tantalum electrolytic capacitor in series resistance, inductance, the temperature stability have obvious advantages. However,its low operating voltage.
　　Rated voltage aluminum electrolytic capacitor of 1.3 times as the surge voltage of a capacitor, the working voltage is higher than 160V, is rated working voltage +50V as thesurge voltage, this voltage manufacturers guarantee, can allow bear the voltage in a short time. The capacitor in thesurge voltage, current will be large, usually 10~15 times the normal situation, if the time is too long, will burst open. So the general choice of aluminum capacitor voltage selectedshould be slightly higher, the actual working voltage isnominal voltage should be 70~80%.
　　Aluminum electrolytic capacitor application guide "as follows:
　　The 1 electrolytic capacitors in the filter circuit according to the specific circumstances of the voltage value 1.2--1.5 times the noise peak, not according to the filtering circuitratings; 2 electrolytic capacitor is under no pads and vias.
　　The 3 electrolytic capacitors may and a heating elementsurrounding the direct contact.
　　4 aluminum electrolytic capacitor is divided into positive and negative, not reverse voltage and AC voltage, using a non-polar capacitor may appear on the reverse voltage should be the place.
　　5 the need for fast charging and discharging place, should not use aluminum electrolytic capacitor, should choose thespecially designed with longer life of capacitor.
　　6 should not be using sewing voltage overload voltage of A. DC voltage jade cultural voltage after superposition is lower than the rated value.
　　Consider using a balance resistor when more than two B.electrolytic capacitor in series, the voltage of each capacitor is in the range of its rated.
　　7 the design of the circuit board, should note capacitor Qiexplosion-proof valve top shall not have any lines, and shall be void, leaving more than 2mm.
　　The 8 electrolysis is also main chemical solvents andelectrolytic paper is flammable, and conductive electrolyte.When in contact with electrolyte and PC board, PC boardline corrosion. So, smoke or fire. So it should not be in any of the following lines of electrolytic capacitor.
　　The 9 circuit board design support should be recognizedunder the heating component is not close to the aluminum electrolytic capacitor and electrolytic capacitor.