Selection of Organic Film Fixed Capacitors for Color TV
Color TV sets have high requirements on component quality. The capacitors used require small temperature coefficients, high insulation resistance, and small loss tangents. In color TV sets, fixed capacitors use organic film capacitors in addition to electrolytic capacitors and ceramic capacitors. .
There are many types of organic film capacitors, including polystyrene film capacitors, such as CB10 type, CB11 type; precision grade polystyrene capacitor CB14 type, CB15 type, CB30 type, CM401 type; polystyrene high voltage film capacitor C508 type, CB80; sealed metallized polystyrene capacitor CB40 type, etc.
The capacity of PTFE capacitors (CF series) ranges from hundreds of picofarads to 0.47μF. It can withstand high temperatures and can work under environmental conditions of more than 100 degrees Celsius. It has high insulation resistance and low medium hygroscopicity. From audio frequency to ultra-high frequency range, tgδ About 0.005.
The dielectric strength of the polypropylene capacitor is high, the insulation performance is good, the insulation resistance is not less than 20,000MΩ, the metalized polypropylene capacitor, its pole piece is formed by directly evaporating a metal film on the polypropylene film, the characteristics of this structure It eliminates the gap between the electrode and the film, can reduce the volume of the capacitor, improve the temperature characteristics, and improve the stability of the capacitor. Moreover, when the external circuit voltage is high, causing the capacitor dielectric to click through, due to the large short-circuit current at the breakdown point, a local high temperature is generated, causing the nearby metalized electrode film layer to volatilize and have self-healing properties.
The type prefix of polypropylene film capacitors is CBB. Metal foil polypropylene capacitors such as CBB12 series have rated voltages of 100V, 160V, 220V, 400V, 630V, 1000V, 1600V, and other specifications. The capacitance range is 0.001-0.47μF . Metalized polypropylene capacitors such as CBB24 and CBB24A have rated voltages of 1000V, 1250V, and 1600V, and have a capacity range of 0.0015-0.22μF. They are suitable for the use of color TV reverse travel and other high-voltage pulse circuits.
Polyester capacitor model prefix CL, such as CL11, CL12, CL20, CL21, CL61, etc., is a supporting component of color TV, product performance is stable, working electric village has 100V, 160V, 250V, 630V, 1000V and other specifications, CL11, CL12 capacitance range is 0.001-0.47μF. Among them, CL20, CL21, CL61 are metallized polyester capacitors with a capacity range of 0.0047-10μF.
CLS21 is a metalized carbonate capacitor with a rated voltage of 40-400V and a capacitance range of 0.0047-10μF.
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