As LED full color display, LED electronic display, LED unit board and other LED technology operators, all kinds of electronic components of the understanding and understanding is very necessary.
A capacitor is a container capable of storing charge. It is made of two pieces of metal sheet, the middle and then separated by insulating material and composition. Depending on the insulating material, a wide variety of capacitors can be made. Such as: mica, porcelain, paper, electrolytic capacitors, and so on. In the structure, and is divided into fixed capacitors and variable capacitors. Capacitors to the DC resistance is infinite, that is, the capacitor has a DC function. The resistance of the capacitor to the alternating current is affected by the alternating current frequency, that is, the same capacity of the capacitor for different frequencies of alternating current presents a different capacitive reactance. Is it possible to open these phenomena? This is because the capacitor is dependent on its charge and discharge function to work, the power switch s is not closed. The two metal plates of the capacitor and other common metal plates are not charged. When the switch S is closed, the free electrons on the capacitor positive plate are attracted by the power supply and pushed to the negative plate. As the capacitor between the two plates with insulating material, so from the positive plate running free electrons in the negative plate above the accumulation. The positive plate will be brought by the electronic reduction of positive charge, the negative plate will be due to the gradual increase in electronic and brought negative.
There is a potential difference between the two plates of the capacitor, and when the potential difference is equal to the supply voltage, the charging of the capacitor is stopped. At this time if the power cut off, the capacitor can still maintain the charging voltage. For a charged capacitor, if we connect the two plates with wires, the electrons pass through the wires and return to the positive plate due to the potential difference between the plates until the potential difference between the plates is zero. The capacitor has returned to the neutral state without electricity, there is no current in the wire. The frequency of the charging and discharging of the capacitor is increased, and the charging and discharging current is also enhanced. That is to say, the blocking effect of the capacitor on the alternating current with high frequency is reduced, The capacitance of the capacitor is low due to the low frequency of alternating current. For the same frequency of AC power. The larger the capacity of the capacitor, the smaller the capacity resistance, the smaller the capacity, the greater the capacity resistance.