Selection of organic film fixed capacitors for color TV sets

Color TV sets have high requirements on component quality. Capacitors used require small temperature coefficient, high insulation resistance and small loss tangent. In color TV sets, fixed capacitors use electrolytic 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 and CB11; precision polystyrene capacitors CB14, CB15, CB30, CM401; polystyrene high voltage film capacitors C508, CB80; sealed metallized polystyrene capacitor CB40 type.

The capacity of PTFE capacitors (CF series) is from hundreds of micro-methods to 0.47μF. It can withstand high temperature and can work under environmental conditions of more than 100 degrees Celsius. It has high insulation resistance and low moisture absorption. From audio to ultra-high frequency range, tgδ About 0.005 or so.

The polypropylene capacitor dielectric has high electric strength, good insulation performance, and insulation resistance of not less than 20,000 MΩ. The metallized polypropylene capacitor has a pole piece which is directly evaporated on a polypropylene film to form a metal film. It eliminates the gap between the electrode and the film, reduces the capacitor volume, improves the temperature characteristics, and improves the stability of the capacitor. Moreover, when the external circuit voltage is high and the capacitor medium is clicked through, the short-circuit current at the breakdown point is large, local high temperature is generated, and the nearby metallized electrode film layer is volatilized, and has self-healing property.

Polypropylene film capacitors are prefixed with CBB, metal foil polypropylene capacitors such as CBB12 series, rated voltages are 100V, 160V, 220V, 400V, 630V, 1000V, 1600V, etc., and the capacitance range is 0.001-0.47μF. . Metallized polypropylene capacitors such as CBB24 and CBB24A are rated at 1000V, 1250V, and 1600V, and have a capacity range of 0.0015-0.22μF. They are suitable for use in color TV reverse and other high-voltage pulse circuits.

Polyester capacitor model prefix word CL, such as CL11, CL12, CL20, CL21, CL61 and other models, is a matching component of color TV, product performance is stable, working village has 100V, 160V, 250V, 630V, 1000V and other specifications, CL11, The CL12 capacitance range is 0.001-0.47μF. Among them, CL20, CL21 and CL61 are metallized polyester capacitors with a capacity range of 0.0047-10μF.

CLS21 is a metallized carbonate capacitor with a rated voltage of 40-400V and a capacitance range of 0.0047-10μF.