Novel metalizing polypropylene thin film capacitor

Abstract

The invention relates to a metalizing polypropylene thin film capacitor, which is internally provided with two layers of single remaining edge evaporation polypropylene films which are mutually superimposed, wherein at least one layer of polypropylene film is superimposed on the non-superimposing surface of the at least one layer of single remaining edge evaporation polypropylene film; the single remaining edge evaporation polypropylene films comprise basal films and aluminium coating evaporated on the basal films; the spacing remained between one side of the aluminium coating and one side of the basal film is 0.4mm; the thickness of the basal film is 3mum to 12 mum; the capacitor has small sheet resistance, thickening film layer, increases withstanding voltage, and simultaneously, has augmented lateral area and contact surface of a metal spaying layer, stable exhaustion value and strong conducting fluid capacity; the distance of the remained edge is reduced, namely, aligning area of a polar plate is increased and the capacitance is amplified, while the capacitance volume ratio becomes smaller, the volume of the corresponding capacitor is reduced; therefore, the capacitor is suitable for being arranged in various small-sized electric equipment.

Description

technical field [0001] The invention relates to capacitors in the field of electronic components, in particular to a metallized polypropylene film capacitor. Background technique [0002] The existing film capacitors use metal polypropylene film as the medium and electrodes, and use flame retardant materials to encapsulate the one-way leads. They have the characteristics of excellent electrical performance, good reliability, low loss and good self-healing performance, and are suitable for high-frequency circuits. Among them, it is widely used in instruments, meters, TV sets, radios and household appliances for DC pulsation, pulse and AC step-down, especially for energy-saving lamps and electronic rectifiers. Now that Philips develops and produces T5 fluorescent lamp ballasts, there is no place for larger metallized polypropylene film capacitors, such as figure 1 The schematic diagram of the structure of the existing metallized polypropylene film capacitor is shown. The with...

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Problems solved by technology

Now that Philips develops and produces T5 fluorescent lamp ballasts, there is no place for larger metallized polypropylene film capacitors, such as figure 1 The schematic diagram of the structure of the existing metallized polypropylene film capacitor is shown. The withstand voltage of the capacitor is low, and the pin pitch is at least 7.5mm, resulting in a large capacitor volume; mm, the margin distance is large, the effective frontal area of ​​the plate is small, and the capacity is small; the contact surface of the gold spray layer is small, and the loss value is unstable

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