Discussion on charge and discharge of capacitors

May 25, 2019   Pageview:32

Capacitors are the inherent characteristics of capacitors and are only related to the sub-pairs of the E-L6207D plates, the distance between the plates, and the medium between the plates, regardless of whether the capacitor is charged or not. Capacitors exist between any two conductors. The capacitor has a voltage resistance value. When the voltage applied between the plates of the capacitor is greater than its rated voltage, the capacitor will be broken.


Charge and discharge of capacitors


During the charging process, the capacitor mainly stores electrical energy(charge), that is, stored energy; During the discharge process, energy is released because the capacitor neutralizes the positive and negative charges.


During the charging process of the capacitor, as the amount of charge carried on the capacitor bipolar plate increases, the voltage at both ends of the capacitor will gradually increase, and the charging current will gradually decrease. When the charging is over, the current is zero, and the voltage at both ends of the capacitor is equal to the power supply voltage.


During the discharge process of the capacitor, with the reduction of the amount of electricity on the capacitor plate, the voltage at both ends of the capacitor gradually decreases until the discharge current gradually decreases to zero. At this time, the discharge process ends.


Type of capacitor


Depending on whether the capacity is variable, it can be divided into specified capacitors and variable electric containers(including semi-variable electric containers).


& GT; Fixed capacitors: Common media include mica, ceramics, metal oxide films, paper media, aluminum electrolytes, etc..


& GT; Variable electric container: The capacitance can be adjusted within a certain range, and the common electric medium is thin film medium, mica, etc..


& GT; Semi-variable capacitor: also known as a fine-tuning capacitor, which is often used as a compensation capacitor in circuits. The capacity is generally only a few pegs to a few dozen Pifa. Commonly used media are porcelain media, organic thin films and so on.


Capacitors apply the functions of various electronic circuits as follows.


& GT; High frequency bypass: ceramics, mica, glass film, polyester, glass glaze capacitor.


& GT; Low frequency bypass: paper medium, ceramic capacitor, aluminum electrolysis, polyester capacitor.


& GT; Filter: aluminum electrolytic capacitor, liquid tantalum capacitor, paper dielectric, composite paper dielectric capacitor.


& GT; Tuning: Ceramic, mica, vitreous, polystyrene capacitors.


& GT; Coupling: paper medium, ceramic capacitor, aluminum electrolysis, polyester capacitor, solid tantalum container.


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