Explosion-proof metallized film for PFC (power factor correction) power capacitor
By applying an explosion-proof metallized film to PFC capacitors and utilizing the fuse structure design of the mesh section and mesh edge section, the problem of capacitor explosion has been solved, achieving a balance between safety and lifespan, and improving the explosion-proof performance and current carrying capacity of capacitors.
Patent Information
- Application Number
- CN202520008254.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing PFC capacitors are prone to catching fire and exploding during use, and there is a lack of effective explosion-proof technology.
It adopts an explosion-proof metallized film, including the grid section, the grid edge section and the screen strip. Through the design of the grid strip and fuse-free structure, it achieves self-healing function and avoids high-temperature breakdown under current overload.
It effectively prevents capacitor explosions, improves capacitor safety and service life, reduces production costs, and improves capacitor's ultimate withstand voltage and current carrying capacity under the same conditions.
Smart Images
Figure CN223842772U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, and in particular to an explosion-proof metallization film for PFC power capacitors. Background Technology
[0002] The function of a PFC capacitor is to withstand the high-voltage current of the PFC circuit. Three important parameters of a PFC capacitor are its voltage rating, temperature rating, and capacitance. The capacitor bears the highest voltage in the entire power supply because it needs to withstand the high-voltage current output by the PFC circuit. Most mainstream PC power supplies now use active PFC circuits, which are essentially boost rectifier circuits that convert the input AC mains power into a higher voltage pulsed DC current. The maximum voltage often exceeds 300V, even reaching 380V. Therefore, PFC capacitors must have high voltage ratings; generally, 400V capacitors are required, while high-end power supplies use 420V or even 450V capacitors for greater redundancy and safety. Currently, there is no particularly effective technical support for explosion prevention in PFC capacitors on the market, making them prone to catching fire and potentially exploding during use. Utility Model Content
[0003] The purpose of this invention is to provide an explosion-proof metallized film for PFC power capacitors. This explosion-proof metallized film is not easy to catch fire, effectively preventing capacitor explosion. Moreover, the film capacitor, with its excellent and stable performance and long-term reliable life, effectively balances the explosion-proof performance and lifespan of the capacitor, thereby meeting customer requirements and overcoming the shortcomings of the prior art.
[0004] The technical solution of this utility model is: an explosion-proof metallized film for PFC power capacitors, comprising a plastic film, a metal plating layer on the surface of the plastic film, the metallized film comprising a grid section sheet resistor, a grid edge section, and a screen strip, wherein the width of the grid edge section is greater than 1 / 3 and less than 1 / 2 of the film width, the width of the grid section sheet resistor is greater than 1 / 3 of the film width and less than the grid edge section, and the screen strip is a blank transparent unplated area, and both the grid section sheet resistor and the grid edge section have a metal plating layer, characterized in that: the grid section sheet resistor and the grid edge section are separated by several segments of unplated grid strips A, the unplated grid strips A are disposed between the grid section sheet resistor and the grid edge section, the unplated grid strips A are provided with a grid edge section safety, and the grid section sheet resistor and the grid edge section are connected by the grid edge section safety.
[0005] Furthermore, the grid section sheet resistor includes several parallel grids, adjacent grids are separated by blank grid edges B, a grid safety device is set in the middle of the blank grid edges B, adjacent grids are connected by the grid safety device, the grid safety device is located in the middle of the unplated grid strip A and the screen strip, and two grid edge safety devices are set on each grid.
[0006] Furthermore, the blank mesh edge B is perpendicular to the screen strip (3), and the blank mesh edge B is composed of the unplated area on the surface of the plastic film.
[0007] Furthermore, the width of the mesh edge (2) is L3 = 6.7 ± 0.5 mm, the width of the screen strip (3) is L2 = 0.8 ± 0.5 mm, and the mesh height is L4 = 6.35 ± 0.5 mm.
[0008] The above technical solution has the following beneficial effects:
[0009] The explosion-proof metallized film provided by this utility model, while possessing the "self-healing" performance of ordinary metallized films, utilizes a special structural design of the metallized electrode plate. The transverse warp lines in the middle of the rectangular grid coating and the straight warp lines above the rectangular grid all employ a fuse structure. When the voltage is too high, the instantaneous high temperature generated by the fuse breakdown will break the circuit in the warp lines, thereby cutting off the current and achieving the explosion-proof function. No additional explosion-proof structure is required, improving work efficiency, reducing production costs, and achieving the effect of capacitor safety protection. Furthermore, it effectively balances explosion-proof performance with lifespan; customer feedback indicates that the lifespan of capacitors formed by this film meets customer requirements.
[0010] The safety film capacitor of this invention is mainly used in the field of PFC power supply. Under the same design, the ultimate withstand voltage of the safety film is higher than that of the ordinary film. The safety film design can reduce the sheet resistance on the film, thereby improving the current carrying capacity of the capacitor. Attached Figure Description
[0011] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0012] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0013] Figure 1 This is a schematic diagram of the structure of the explosion-proof metallized film of this utility model. Detailed Implementation
[0014] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0015] See Figure 1 As shown, this utility model discloses an explosion-proof metallized film for PFC power capacitors, comprising a plastic film and a metallized layer on the plastic film. The metallized film includes a grid-shaped sheet resistor 1, a mesh edge portion 2, and a screen strip 3. The width of the mesh edge portion 2 is greater than 1 / 3 of the film width but less than 1 / 2 of the film width. The width of the grid-shaped sheet resistor 1 is greater than 1 / 3 of the film width but less than the mesh edge portion 2. The screen strip 3 is a blank, transparent, unplated area. Both the grid-shaped sheet resistor 1 and the mesh edge portion 2 have a metallized layer. The grid-shaped sheet resistor 1 and the mesh edge portion 2 are separated by several unplated grid strips A. The unplated grid strips A are arranged between the grid-shaped sheet resistor 1 and the mesh edge portion 2. Mesh edge safety devices are provided on both sides of the unplated grid strips A, so that the grid-shaped sheet resistor 1 and the mesh edge portion 2 are connected by the mesh edge safety devices.
[0016] The grid section sheet resistor 1 includes several parallel grids, adjacent grids are separated by blank grid edges B, a grid safety device is set in the middle of the blank grid edges B, and adjacent grids are connected by the grid safety device. The grid safety device is located in the middle of the unplated grid strip A and the screen strip 3, and two grid edge safety devices are set on each grid.
[0017] The blank mesh edge B is perpendicular to the screen strip 3. The blank mesh edge is composed of the unplated area on the surface of the plastic film. The mesh edge 2 and the screen strip 3 are located on both sides of the grid section square resistor 1, respectively.
[0018] Taking a metallized film with a film width L1 = 14.0 ± 0.5 mm as an example, its mesh edge 2 width L2 = 6.7 ± 0.5 mm, screen strip 3 width L3 = 0.8 ± 0.5 mm, grid height L4 = 6.35 ± 0.5 mm, grid width L5 = 5.0 ± 0.5 mm, grid safety width L6 = 0.45 ± 0.5 mm, mesh edge safety width L7 = 0.5 ± 0.5 mm, blank mesh edge B width L8 = 0.15 ± 0.1 mm, and unplated grid strip A width L9 = 0.15 ± 0.1 mm.
[0019] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.
Claims
1. An explosion-proof metallized film for PFC power capacitors, comprising a plastic film, a metal plating layer on the surface of the plastic film, the metallized film comprising a grid sheet resistor (1), a grid edge portion (2), and a screen strip (3), wherein the width of the grid edge portion (2) is greater than 1 / 3 and less than 1 / 2 of the film width, the width of the grid sheet resistor (1) is greater than 1 / 3 of the film width and less than the width of the grid edge portion (2), the screen strip (3) is a blank transparent unplated area, and both the grid sheet resistor (1) and the grid edge portion (2) have a metal plating layer, characterized in that: The grid section (1) and the grid edge section (2) are separated by several unplated grid strips A. The unplated grid strips A are arranged between the grid section (1) and the grid edge section (2). The grid edge section is provided with safety devices on both sides of the unplated grid strips A. The grid section (1) and the grid edge section (2) are connected by the safety devices.
2. The explosion-proof metallized film for PFC power capacitors according to claim 1, characterized in that: The grid section sheet resistor (1) includes several parallel grids, adjacent grids are separated by blank grid edges B, a grid safety is set in the middle of the blank grid edges B, and adjacent grids are connected by the grid safety. The grid safety is located in the middle of the unplated grid strip A and the screen strip (3), and two grid edge safety are set on each grid.
3. The explosion-proof metallized film for PFC power capacitors according to claim 2, characterized in that: The blank mesh edge B is perpendicular to the screen strip (3), and the blank mesh edge B is formed by the unplated area on the surface of the plastic film.
4. The explosion-proof metallized film for PFC power capacitors according to claim 1, characterized in that: The width of the mesh edge (2) is L2 = 6.7 ± 0.5 mm, the width of the screen strip (3) is L3 = 0.8 ± 0.5 mm, and the mesh height is L4 = 6.35 ± 0.5 mm.