Three-internal serial type metalized film

Abstract

The invention discloses a three-internal serial type metalized film which is characterized by comprising a base film (1), wherein three wide metal plated strips (5) are formed on an evaporation platedsurface of the base film (1) by using an evaporation plating technique; the three wide metal plated strips (5) are isolated by four blank isolation strips (4); a cutting machine is adopted to cut thethree wide metal plated strips (5) along middle axes to form a first metalized film (2) and a second metalized film (3); the first metalized film (2) comprises two blank isolation strips (4), one wide metal plated strip (5) and a first narrow metal plated strip (22); the second metalized film (3) comprises two blank isolation strips (4), one wide metal plated strip (5) and a second narrow metal plated strip (32). A buffer capacitor made of the film is low in internal self sensation and equivalent series resistance, stable in quality and in addition low in manufacturing cost.

Description

technical field [0001] The invention relates to a metallized film material for the production and manufacture of film capacitors, in particular to a three-inner series metallized film. Background technique [0002] Film capacitors are widely used because of their good pressure resistance and self-healing properties. Metallized films are important materials for the production of film capacitors. High-purity metals (such as Al, ZN) are melted, evaporated, and precipitated in a high vacuum state. On the dielectric base film, the film after forming a very thin layer of metal coating on the surface of the dielectric base film is the metallized film; in the application circuit of power electronic power devices, buffer circuits must be set without exception, that is, absorbing circuits , the snubber capacitor can effectively absorb the parasitic inductance from inside the transistor (IGBT) and release extremely high peak voltage pulses at the high-speed turn-off moment, and the dam...

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Problems solved by technology

[0002] Film capacitors are widely used because of their good pressure resistance and self-healing properties. Metallized films are important materials for the production of film capacitors. High-purity metals (such as Al, ZN) are melted, evaporated, and precipitated in a high vacuum state. On the dielectric base film, the film after forming a very thin layer of metal coating on the surface of the dielectric base film is the metallized film; in the application circuit of power electronic power devices, buffer circuits must be set without exception, that is, absorbing circuits , the snubber capacitor can effectively absorb the parasitic inductance from inside the transistor (IGBT) and release extremely high peak voltage pulses at the high-speed turn-off moment, and the damage of the snubber capacitor will lead to damage in the application circuit; the conventional two-layer single-sided metallized film capacitor The performance is poor and cannot withstand the damage caused by the peak voltage pulse. The existing technical solution is: use three independent cores wound with two layers of single-sided metallized film, and connect them in series externally through connecting wires; although it can adapt to this occasion , but there are deficiencies: 1. It is impossible to reduce the internal self-inductance and equivalent series resistance of the capacitor; 2. There are many solder joints and there are hidden dangers of wiring, which leads to unstable quality; 3. Relatively large volume, waste of materials, and increase the cost

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