Capacitor knowledge
The meaning of a capacitor: A physical quantity that measures the ability of a conductor to store charge.
Capacitor abbreviations: C (capacitor)
The sign of the capacitor in the circuit: C or CN (reserve)
Common units for capacitors: millifarad (mF), microfarad (uF), nanofarad (nF), and picofarad (pF)
The unit conversion of the capacitor: 1 Farah = 103 millifa = 106 microfarads = 109 nanofarads = 1012 picofarads;; 1pf = 10-3nf = 10-6uf = 10-9mf = 10-12f;
The role of the capacitor: DC blocking, bypass, coupling, filtering, compensation, charge and discharge, energy storage, etc.
The characteristics of the capacitor: The size of the capacitor indicates the size of the energy that can be stored. The impedance of the capacitor to the AC signal is called capacitive reactance. It is related to the frequency and capacitance of the AC signal. . The characteristics of the capacitor are mainly DC-blocking and alternating-current, low-frequency resistance and high frequency.
Capacitors are generally represented by a "C" plus a number in the circuit. For example, C25 indicates a capacitor numbered 25.
The identification method of the capacitor and the identification method of the resistance are basically the same, divided into three kinds of straight standard method, color standard method and number standard method.
a; Straight standard method is to represent the nominal value of the capacitor on the body of the capacitor in numbers and units: for example: 220MF means 220UF; .01UF means 0.01UF; R56UF means 0.56UF; 6n8 means 6800PF.
b; digital representation of non-standard units. One to four digits are used to indicate a valid number, which is generally PF, and the capacity of the electrolytic capacitor is UF. For example: 3 means 3PF; 2200 means 2200PF; 0.056 means 0.056UF;
c; digital representation: generally use three to represent the size of the capacity, the first two significant figures, the third represents the power of 10 times. Such as 102 represents 10 * 102 = 1000PF; 224 represents 22 * ​​104 = 0.2UF
d: Use the color ring or color point to indicate the main parameters of the capacitor. The color code method of the capacitor is the same as the resistance.
Capacitor deviation sign: +100%-0--H, +100%-10%--R, +50%-10%--T, +30%-10%--Q, +50%-20% --S, +80%-20%--Z.
Classification of capacitors: According to the polarity can be divided into polar capacitors and non-polar capacitors. The common electrolytic capacitors we have are polar, there is a positive and negative points.
The main performance indicators of a capacitor are: the capacity of the capacitor (ie, the capacity of the stored charge), the pressure resistance value (refer to the maximum DC voltage or the effective value of the maximum AC voltage at which the capacitor can work reliably for a long time within the rated temperature range), and the temperature resistance value ( Indicates the maximum operating temperature that the capacitor can withstand.).
The brands of capacitors are: motherboard capacitors are mainly divided into two types: Taiwan and Japan. Japanese brands are: NICHICON, RUBICON, RUBYCON (Ruby), KZG, SANYO (Sanyo), PANASONIC (Panasonic), NIPPON, FUJITSU (Fujitsu), etc.; Taiwanese brands include TAICON, G-LUXCON, TEAPO, CAPXON, OST, GSC, and RLS.
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