The CBB capacitor is actually a polypropylene capacitor, and is a capacitor in which a metal foil is used as an electrode, and a polypropylene film is stacked from both ends and then wound into a cylindrical structure. Non-polar, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. It is widely used in resonant circuits, bypass circuits, and high-frequency high-voltage circuits.
First, the capacitor profile
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CBB capacitor (Electric capacity) consists of two metal poles with an insulating material (medium) sandwiched between them. The types of capacitors formed vary depending on the insulating material:
According to the structure can be divided into: fixed capacitor, variable capacitor, trimmer capacitor.
Divided by polarity: there are polar capacitors and non-polar capacitors. The most common thing we get is electrolytic capacitors.
CBB capacitors have a blocking DC in the circuit and are used for AC coupling. They are often used for interstage coupling, filtering, decoupling, bypassing and signal tuning.
Second, the symbol of the capacitor
The symbol of the capacitor is also divided into the domestic standard representation and the international electronic symbol representation, but the capacitance symbol is similar in both domestic and international representations. The only difference is that in the case of a polar capacitor, the domestic one is a horizontal line below the empty basket. And the international is the ordinary capacitor plus a "+" symbol to represent the positive.
Third, the unit of capacitance
The basic unit of resistance is: F (method), in addition to μF (micro method), pF (pesh method), there is also a relatively small unit used, that is: nF (), because the capacity of the capacitor F is very Large, so what we see is generally the unit of μF, nF, pF, not the unit of F.
The specific conversion between them is as follows:
Fourth, the withstand voltage of the capacitor Unit: V (volts)
Each capacitor has its withstand voltage value, which is one of the important parameters of the capacitor. The nominal withstand voltage values of common non-polar capacitors are: 63V, 100V, 160V, 250V, 400V, 600V, 1000V, etc. The withstand voltage of a polar capacitor is relatively lower than that of a non-polar capacitor. The withstand voltage values are: 4V, 6.3V, 10V, 16V, 25V, 35V, 50V, 63V, 80V, 100V, 220V, 400V, etc. For more information, please visit http://www.pad-china.cn
Five, the type of capacitor
There are many types of capacitors, which can be divided into two parts: non-polar variable capacitors, non-polar fixed capacitors, and polar capacitors. They can be divided into: CBB capacitors (polyethylene), polyester capacitors, and ceramic capacitors. , mica capacitors, monolithic capacitors, electrolytic capacitors, tantalum capacitors, etc.
Main features: performance similar to polystyrene but small size, slightly poor stability
Let me introduce to you what kind of situation you need to quit running:
(1) The capacitor current is significantly reduced.
(2) The internal noise of the capacitor is abnormal.
(3) The capacitor casing expands or a large amount of internal medium seeps out.
(4) The insulated terminal is broken or there is a burnt mark on the surface.
(5) The temperature of the outer casing is higher than 65 °C, and the temperature piece falls off.