CBB82S type high current resistant long life polypropylene film capacitor

Abstract

The invention provides a CBB82S type high current resistant long life polypropylene film capacitor. A metallized polypropylene film APHMD with double-sided aluminum plating and a side in the middle is used as the electrode layer of an inner series structure capacitor. The base film of a metallized polypropylene film APHT with one-sided aluminum plating and double sides and the PPH polypropylene high temperature film between the APHMD and the APHT are used as the medium of the capacitor, and the aluminum plating layer of the APT is used as the series electrodes of inner series capacitors C1 and C2. The processes of horizontal centering among three layers of films, vertical winding and winding error amplitude 5MM above are used in the winding process, a pure aluminum base and tin-zinc alloy spraying are employed in the spraying process, the contact resistance of the double-sided aluminum plating electrode layer and a pure aluminum metal spraying layer is extremely low, the equivalent series resistance ESR of the capacitor is reduced, the current resistance characteristics of the capacitor is improved, the loss angle tangent value of the capacitor is reduced, the temperature rise of the capacitor is reduced, thus the service life of the capacitor is prolonged to 10 years.

Description

Technical field: [0001] Film capacitor field technical background: [0002] In recent years, film capacitors have been widely used in low-carbon, environmentally friendly and energy-saving frequency conversion air conditioners, frequency conversion microwave ovens, frequency conversion speed controllers and other variable frequency power supplies. However, the development of film capacitors in my country has not been able to keep up with the development of the frequency conversion power supply industry. , is still in the CBB82 product stage, and its current resistance characteristics cannot meet the requirements of the variable frequency power supply industry. Therefore, the variable frequency power supply industry has to rely on imported Panasonic and EPCOS and other foreign brands such as MMKP81 type capacitors. [0003] However, CBB82 and MMKP81 capacitors have serious design flaws: [0004] ①The electrode layer of the lead-out electrode of the MMKP81 capacitor is made o...

AI Technical Summary

Problems solved by technology

[0004] ①The electrode layer of the lead-out electrode of the MMKP81 capacitor is made of double-sided aluminum-plated polyester film ATMD, such as figure 2 As shown; although the total square resistance is low, the carrier is polyester film, while the other two dielectric layers are made of polypropylene film. Polyester film and polypropylene film are mixed together, and their temperature characteristics are completely different, resulting in heat shrinkage Different, the thermal polymerization is very poor, the adhesion between the polyester film and the polypropylene film is not tight, and the gold powder enters between the polyester film and the polypropylene film, causing the insulation resistance of the capacitor to drop, poor consistency, instability and other hidden dangers

[0005] ②CBB82 type capacitor lead-out electrode is a single-sided aluminum coating of polypropylene film APM with edges left in the single-sided aluminum coating, such as figure 1 As shown; the square resistance is 2 times higher than that of double-sided plating, the current resistance parameter is 2 times lower than that of double-sided plating, and the contact resistance with the gold-sprayed layer is increased by 2 times, and the contact loss is increased by 2 times

[0006] ③MMKP81 type capacitor gold spraying process is to spray quaternary alloy directly, such as image 3 As shown; the molecular structure of the quaternary alloy is completely different from that of the pure aluminum coating, so the contact resistance increases and the contact loss increases

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