984 results about "Film capacitor" patented technology

The invention belongs to the technical field of thin film capacitors, and particularly relates to a chemical grafting modified polypropylene capacitor film material and a preparation method and application thereof. According to the preparation method of the chemical grafting modified polypropylene capacitor film material, provided by the invention, diethylenetriamine ethyl acrylate with a plurality of specific groups such as amino groups and carboxyl groups and unsaturated double bonds is synthesized through esterification reaction, and the diethylenetriamine ethyl acrylate is introduced into a polypropylene material through chemical grafting to obtain chemical grafting modified polypropylene; the prepared polypropylene capacitor film material has the excellent properties of good compatibility, difficulty in film breakage, capability of adsorbing and removing residual moisture, difficulty in oxidation corrosion, excellent breakdown resistance and the like, and the preparation method is a preparation method of the high-performance polypropylene capacitor film material; therefore, the technical problem that a polypropylene capacitor film material prepared in the prior art is low in performance is solved.

A hard start capacitor replacement unit has a plurality of capacitors in a container sized to fit in existing hard start capacitor space. The capacitors are 4 metallized film capacitors wound in a single cylindrical capacitive element. The container has a common terminal and capacitors value terminals for the plurality of capacitors, which may be connected singly or in combination to provide a selected capacitance. An electronic or other relay connects the selected capacitance in parallel with a motor run capacitor. The hard start capacitor replacement unit is thereby adapted to replace a wide variety of hard start capacitors.

The invention discloses a polypropylene film for a film capacitor, the polypropylene film is composed of polypropylene and a cyclic olefin polymer, a plurality of gaps are distributed in the film, the gaps are approximately annular on the cross section of the film, and the inner diameter of the approximately annular gaps is 20-120nm. The invention also provides a preparation method of the polypropylene film, which comprises the following specific steps: putting the polypropylene and the cyclic olefin polymer into an extruder, heating and melting; the melt is extruded through a T-shaped die head and attached to a piece casting roller through an air knife for piece casting, and the temperature of the piece casting roller is 85-95 DEG C; the method comprises the following steps: preheating a cast sheet, longitudinally stretching at the stretching rate of 4-7 times and at the temperature of 135-150 DEG C, preheating the longitudinally stretched sheet at the temperature of 145-160 DEG C, transversely stretching at the stretching rate of 7-10 times and at the stretching temperature of 165-180 DEG C, and then entering a shaping area at the temperature of 168 DEG C; and carrying out corona treatment, rolling, curing and slitting on the heat-set film to obtain the product. The polypropylene film has good high temperature resistance and high pressure resistance, and is suitable for the field of capacitors.

The invention relates to the technical field of power electronics, and discloses a method for monitoring the service life of a metallized film capacitor, which comprises the following steps: collecting multi-physical field signals of the metallized film capacitor in real time through a sensor, preprocessing the collected multi-physical field signals, establishing a coupling model based on multiple physical fields, and calculating the service life of the metallized film capacitor. The method comprises the following steps: obtaining multi-physical field distribution of a metallized film capacitor, carrying out feature extraction on the multi-physical field distribution through wavelet transform, calculating multi-scale energy distribution characteristics of signals, carrying out dynamic reasoning on the health state of the capacitor based on the multi-scale energy distribution characteristics in combination with a dynamic Bayes network, and evaluating the change rule of the health state of the capacitor. And based on the health state change rule, establishing a life loss model, and generating a health assessment report. Multi-physical field signals are collected in real time, physical field distribution characteristics in the capacitor are analyzed, the health state of the capacitor is inferred in combination with a dynamic Bayes network, the remaining life is calculated, and a health assessment report is generated.

To provide a thin film capacitor having a pair of terminal electrodes capable of being disposed on the same plane. A thin film capacitor 1 includes a metal foil having a non-roughened center portion and a roughened upper surface, a dielectric film covering the roughened upper surface of the metal foil, an electrode layer contacting the non-roughened center portion of the metal foil through an opening formed in the dielectric film, and an electrode layer contacting the dielectric film without contacting the metal foil. A thickness of the center portion of the metal foil at a position overlapping the electrode layer is larger than a thickness thereof at a position overlapping the electrode layer.

The vacuum heat treatment clamp applies a certain pressure to the capacitor core, the core is in an inert gas and negative pressure environment for staged heating, finally, a heat conduction box body is slowly deflated, and after the air pressure in the heat conduction box body is balanced with the atmospheric pressure, the heat conduction box body is opened, so that the capacitor core is subjected to vacuum heat treatment. And taking out the capacitor core. According to the process, the capacitor core is located in the negative pressure inert gas environment, the product is isolated from air and is not oxidized, gas in the product can be easily exhausted through the negative pressure environment, and an internal air gap is eliminated; the capacitor core is located in the middle of the heat treatment clamp, different portions of the capacitor core are evenly heated, product shrinkage is even and consistent, and the voltage resistance and the charging and discharging capacity of a capacitor are obviously improved.

The invention discloses a film capacitor enabling control method and system, a medium and a program product, and the method comprises the steps: determining current sampling data and voltage sampling data of a film capacitor in a first time period; calculating an equivalent impedance sequence within a first time length, and determining distribution characteristics of impedance components under different frequencies; dividing a plurality of frequency band intervals, and calculating an impedance change rate matrix in each frequency band interval; determining energy transmission efficiency, and determining a target frequency band interval; generating a compensation coefficient, and adjusting the amplitude and the frequency by using the compensation coefficient to obtain a target sine-wave voltage; performing energizing processing on the thin-film capacitor by adopting the target sine-wave voltage within the remaining time of the energizing duration, and calculating an instantaneous power factor in real time; and when the stability of the instantaneous power factor reaches a preset condition and the leakage current is reduced below a preset threshold value, generating an enabling completion signal. According to the invention, the adaptability between the energizing effect and the actual demand of the thin film capacitor is improved, and the energizing effect is further improved.

The invention discloses a preparation method of a polypropylene coarsened film, belongs to the technical field of preparation of electronic and electrical insulating materials, and particularly relates to preparation of the polypropylene coarsened film. The invention aims to solve the technical problem that the specific preparation process is difficult to regulate and control when the polypropylene coarsened film is prepared at present. By adjusting the heating temperature, the torque, the rotating speed of the motor, the gap between the die head and the machine lip, the temperature of the chilling roller, the casting rotating speed and the winding tension of each area of the extruder, the polypropylene coarsening film which is reasonable in surface appearance and thickness and excellent in dielectric property is obtained, the wettability of the obtained polypropylene coarsening film in insulating oil is good, the dielectric property is excellent, and the service life of the polypropylene coarsening film is prolonged. And the prepared oil-immersed capacitor has good energy storage performance. The polypropylene coarsened film prepared by the invention is mainly used for preparing metallized polypropylene films for oil-immersed capacitors and film capacitors.

The utility model discloses an insulating anti-blocking structure and a thin film capacitor thereof. The insulating anti-blocking structure comprises an insulating part, a pasting part, a first copper bar and a second copper bar, the insulating part is positioned between the first copper bar and the second copper bar, so that the first copper bar and the second copper bar are insulated; two ends of the pasting part are respectively adhered to the insulating part and the first copper bar; the two sides of the pasting part are provided with blocking blocks extending outwards, and the blocking blocks are located between the first copper bar and the insulating part. By arranging the insulating part and the pasting part, the insulating property between the first copper bar and the second copper bar is ensured, and the production yield of the film capacitor is improved; by arranging the barrier block and the injection molding part, the injection molding material can be effectively prevented from overflowing between the insulating part and the first copper bar to influence the structural stability of the injection molding part and the product performance of the film capacitor.

The invention discloses a direct cooling type thin film capacitor shell design optimization evaluation system and method. The system comprises an inversion brick shell and internal architecture design module, an inversion brick shell two-dimensional flow channel fluid domain design and optimization module and an inversion brick shell three-dimensional flow channel fluid domain design, simulation optimization and engineering output module. The inversion brick shell and internal architecture design module is used for designing an inversion brick shell, and the inversion brick shell two-dimensional flow channel fluid domain design and optimization module is used for completing design and optimization of a two-dimensional flow channel fluid domain in the inversion brick shell according to the inversion brick shell; and the inverter brick shell three-dimensional flow channel fluid domain design, simulation optimization and engineering output module is used for completing design and optimization of the three-dimensional flow channel fluid domain in the inverter brick shell and outputting engineering design drawings and manufacturing specifications according to the design and optimization result of the inverter brick shell two-dimensional flow channel fluid domain.

The invention provides a compatibilization modified polypropylene capacitor film material with high dielectric property, a preparation method and a capacitor, polypropylene is used as a matrix, ZrO2 with high dielectric constant is used as a nano filler, maleic anhydride grafted polypropylene is used as a compatilizer, and the compatibilization modified polypropylene capacitor film material with high dielectric property is prepared by a method of reducing interfacial force through the compatilizer. The dispersity of the nano zirconium oxide in the matrix is improved, the agglomeration phenomenon of the nano zirconium oxide is reduced, and the nano zirconium oxide is more uniformly dispersed in the matrix, so that the dielectric property of the nano zirconium oxide is improved. The polypropylene-based composite material has the advantages of safety, stability, simplicity in operation, low production cost, good mechanical properties and the like, is suitable for large-scale production, and has a wide application prospect; the thin film capacitor prepared from the material has the advantages in the aspects of current bearing, dielectric loss bearing and the like.

The invention provides a capacitor core rod plug dismounting device, and belongs to the technical field of capacitor preparation, and the device comprises a strip-shaped frame which is vertical and is provided with two open ends, and the front and rear inner side surfaces are provided with guide grooves; the clamping assembly comprises two movable rods arranged on the two sides of the strip-shaped frame respectively, the axes of the two movable rods are coaxial and are perpendicular to the side face of the strip-shaped frame, and the opposite ends of the two movable rods are elastically arranged in a telescopic mode along the axes and are provided with clamping plates; the two movable rods are synchronously and oppositely arranged along the axis in a moving manner; the pair of bearing rods is horizontally arranged below the strip-shaped frame and perpendicular to the side face of the strip-shaped frame, and the two bearing rods are movably arranged in the width direction of the strip-shaped frame; the dismantling assembly comprises two pairs of top plates which are vertically arranged below the corresponding guide grooves respectively, and the top plates are movably arranged in the width direction of the strip-shaped frame and the axis direction of the movable rod; the two bearing rods respectively penetrate through the two pairs of top plates; and the transmission assembly is arranged between the movable rod and the bearing rod. The dismounting device can achieve the purpose of automatically pulling out the plug, and the production efficiency of the thin film capacitor is improved.

The invention discloses a preparation method and application of a bifunctional acrylate monomer modified polypropylene coarsening film for an extremely cold-resistant oil-immersed capacitor, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The invention relates to application of a bifunctional acrylate monomer modified polypropylene coarsened film in an extremely cold resistant oil-immersed capacitor or a thin film capacitor. The preparation method comprises the following steps: (1) respectively adding a polypropylene coarsened film, a monomer, an interface agent, a co-monomer, an initiator and deionized water in certain parts by weight into a reactor, and heating for swelling; (2) heating the reaction system to a certain temperature, and carrying out grafting reaction; and (3) washing, extracting and drying. According to the invention, the bifunctional acrylate is used as a monomer to carry out long-chain branching modification on the polypropylene coarsened film, so that the problem of poor performance of a capacitor in an extreme environment caused by low-temperature embrittlement and high-temperature insulation deterioration of the polypropylene coarsened film is solved. The method has the advantages of good effect, environmental protection, simple process, low cost and the like.

The present invention provides a polypropylene resin composition, a high-temperature resistant polymer film containing the same, and a preparation method and application thereof. By mass percentage, the polypropylene resin composition includes 79.7-98.9% of polypropylene resin, 1-20% of cycloolefin copolymer, and 0.1-0.3% of radiation crosslinking agent; the glass transition temperature of the cycloolefin copolymer is 120-160 °C; in the present invention, the film including the polypropylene resin composition has a high heat distortion temperature and a low thermal shrinkage rate, good high-temperature resistance, does not affect the dielectric properties of the film capacitor, has a small dielectric loss, can be biaxially stretched at a high draw ratio, and has a low cost.

The invention discloses a high-temperature-resistant BOPP capacitor film and a preparation method and application thereof.The high-temperature-resistant BOPP capacitor film is prepared from polypropylene and organic semiconductor master batch, and the organic semiconductor master batch comprises a conjugated organic semiconductor polymer and a cyclic olefin polymer; the conjugated organic semiconductor polymer and the cyclic olefin polymer are added into the polypropylene to prepare the high-temperature-resistant BOPP capacitor film, the high-temperature-resistant BOPP capacitor film is used for preparing a thin-film capacitor, and the high-temperature-resistant performance of the thin-film capacitor can be remarkably improved.

The invention belongs to the technical field of dielectric film materials, and in particular relates to a method for preparing a polypropylene film for a film capacitor, comprising the steps of: S1, sheet casting preparation; S2, primary synchronous stretching; S3, primary transverse stretching; S4, secondary transverse stretching; S5, secondary synchronous stretching; S6, post-processing. The method for preparing a polypropylene film of the invention can prepare an ultra-wide polypropylene film for a film capacitor with uniform thickness, high longitudinal tensile strength, high transverse elongation, and low thermal shrinkage.

The invention relates to the field of processing of capacitor packaging coatings, and particularly discloses a quick-drying packaging coating for a thin-film capacitor, a preparation method and application. The quick-drying packaging coating for the thin film capacitor consists of a component A and a component B in a mass ratio of 100: (90-100), the component A comprises 30-50 parts of organic silicon modified epoxy resin, 20-30 parts of polyether polyol, 10-25 parts of toughening filler, 1-3 parts of a coating tackifier, 1-3 parts of a flow promoter and 0.5-1 part of a defoaming agent; the component B comprises the following components in parts by weight: 45-75 parts of a curing agent, 1-2 parts of an accelerant, 1-1.5 parts of an antioxidant and 1-2 parts of a weather-resistant agent; the preparation method comprises the following steps: respectively preparing the component A and the component B, respectively packaging, and mixing while using to obtain the packaging coating. The method is applied to a thin-film capacitor. The quick-drying water-based paint has the advantages of quick drying, good moisture resistance, good flexibility and high adhesion stability.

The invention belongs to the technical field of thin-film capacitors, and particularly relates to a high-temperature-resistant high-energy-storage polypropylene capacitor film material and a preparation method and application thereof. According to the high-temperature-resistant high-energy-storage polypropylene capacitor film material provided by the invention, the high-temperature-resistant polar core-shell nanofiller is introduced into the polypropylene capacitor film material, so that the polypropylene capacitor film material has excellent dielectric constant, breakdown strength and energy storage density at a high temperature, the film is not easy to break, and the processability is good; large-area and high-efficiency industrial production is facilitated, the requirements of industrial large-scale production of high-temperature-resistant miniaturized polypropylene capacitor film materials are met, and winding type or laminated type film capacitors and the like can be manufactured; meanwhile, the performance of the polypropylene capacitance film material is further improved by improving the shell layer polar ionic liquid and the core layer high-temperature-resistant nano-filler in the high-temperature-resistant polar core-shell nano-filler; therefore, the technical problem of low performance of the polypropylene capacitor film material in the prior art is solved.

The invention is suitable for the technical field of circuit monitoring, and provides a capacitance value online monitoring method and system based on thin film capacitor self-healing feature perception, and the method comprises the steps: synchronously collecting a voltage signal and a current signal of a to-be-detected thin film capacitor based on a preset sampling period, and constructing a voltage sequence and a current sequence with a unified time sequence; determining a candidate transient time window based on a preset sampling period and the voltage sequence; in the candidate transient time window, a time sequence of a self-healing event is determined based on the voltage sequence and the current sequence, and the self-healing event comprises an arcing stage, an arc quenching stage and a charging recovery stage; and based on the initial voltage, the final voltage and the effective charging current in the charging recovery stage, determining an effective capacitance estimation value of the to-be-tested thin-film capacitor. According to the technical scheme provided by the invention, the self-healing behavior of the thin-film capacitor is accurately identified, so that online monitoring of the capacitance value of the thin-film capacitor is realized, and the capacitance value monitoring error is effectively reduced.

A method for reducing DC bus voltage fluctuations caused by a film capacitor in a permanent magnet synchronous motor, including: sampling, using a voltage sensing circuit, a total DC bus voltage (Udc) from an inverter in real-time; passing the total DC bus voltage (Udc) through a low-pass filter to extract a DC component (Udc0) of the total DC bus voltage; obtaining an AC component (Te=P0·ψf×iq - - - (1)) of the total DC bus voltage (Udc) by subtracting the DC component (Udc0) from the total DC bus voltage (Udc): ũdc=Udc−Udc0; obtaining a reference DC bus voltage (u*dc) by subtracting the AC component (Te=P0·ψf×iq - - - (1)) from the DC component (Udc0): u*dc=Udc0−Te=P0·ψf×iq- - - (1); and passing the reference DC bus voltage (u*dc) to a space vector pulse width modulation (SVPWM) module, thereby performing calculations that generate precise switching signals for the inverter.

The invention discloses a composite material polypropylene film and a preparation method thereof, and belongs to the technical field of polymer modification and polymer films. The preparation method of the composite material polypropylene film comprises the following steps: blending 5-10 wt% of maleic anhydride grafted polypropylene (PP-g-MAH), 5-20 wt% of a cycloolefin copolymer or a cyclic block copolymer and 75-90 wt% of isotactic polypropylene, granulating, carrying out melt extrusion at 240-260 DEG C, and carrying out tape casting at 80-95 DEG C to form a sheet; preheating the sheet at the temperature of 145-170 DEG C, synchronously stretching at the temperature of 150-175 DEG C, carrying out heat setting at the temperature of 160-175 DEG C, and cooling; the composite material polypropylene film is prepared through the steps of extrusion, traction, corona treatment, rolling and the like. The composite material polypropylene film not only has good heat resistance and good dielectric strength at a high temperature, but also has a relatively high dielectric constant and relatively low dielectric loss, and is suitable for a film capacitor.

The utility model provides a film capacitor glue pouring shaping and pin positioning work fixture, which is characterized by comprising a base, a filler strip and a tooth-shaped positioning clamping plate, the tooth-shaped positioning clamping plate, the filler strip and the base are sequentially arranged from top to bottom, the base is provided with a plurality of cavities, the sizes of the cavities are matched with the sizes of product shells, and the tooth-shaped positioning clamping plate and the filler strip are matched with each other. The product shell is loaded with a product and then is arranged in the base cavity; the appearance size of the tooth-shaped positioning clamping plate is consistent with that of the base, the middle of the tooth-shaped positioning clamping plate is an empty slot, a plurality of convex teeth are vertically symmetrical in the empty slot and are provided with cavities matched with sheet pins to insert, and the neutral lines of the convex teeth are consistent with the neutral line of the cavity of the base; the base cavity is through up and down, so that the product is easy to demould after the glue pouring material is cured; the hollowed-out parts of the tooth-shaped positioning clamping plate are more, so that the glue filling operation is easy to complete; a cavity of a base of the product shell is matched, so that deformation of the shell in the high-temperature drying process is prevented; the tooth-shaped positioning clamping plate fixes the sheet pins, so that the pin positioning problem of the capacitor is solved, and deviation of the pins in the transfer process after glue pouring is prevented.

The invention discloses a film capacitor life intelligent prediction method fusing multi-dimensional data, and relates to the technical field of capacitor reliability. According to the method, a multi-dimensional data fusion model is constructed, and three types of core data are creatively integrated: 1, process parameters of the whole manufacturing process of the thin-film capacitor; 2, operation condition data is monitored in real time; and 3, a large-batch historical failure database based on acceleration factors. And dynamically associating the multi-source heterogeneous data by adopting a machine learning algorithm, establishing a nonlinear life attenuation model, and realizing early life early warning by quantifying the contribution degree of process defects to electrical performance degradation. Compared with a traditional method, the method has the advantages that the prediction precision is improved by more than 40%, progressive failure caused by metal layer micro-scratch, self-healing effect accumulation and metal spraying contact degradation hidden factors can be identified, and an accurate basis is provided for preventive maintenance of power electronic equipment.

This biaxially oriented polyarylene sulfide film contains a polyarylene sulfide resin as a main constituent component. The biaxially oriented polyarylene sulfide film has a thickness variation in the film width direction of 0.5% to 10.0% inclusive in a width of 300 mm around the central part in the width direction of the film, an orientation angle from the film longitudinal direction of more than -35° but less than 35°, not less than -90° but less than -55°, or more than 55° but not more than 90°, and a difference between the maximum value and the minimum value of the orientation angle of 0.5° to 20.0° inclusive. The present invention provides a biaxially oriented polyarylene sulfide film which is capable of suppressing warpage at the time of processing, and is excellent in terms of pressure uniformity when a large number of the biaxially oriented polyarylene sulfide films are stacked and pressurized.

The invention relates to the technical field of capacitors, in particular to a high-thermal-conductivity thin-film capacitor of a graphite material and a preparation method thereof, and the preparation method comprises the following steps: spraying a graphene dispersion liquid on the surface of a thin film, judging the conductive state of a coating, and adjusting winding parameters to control spraying equipment to move; judging whether the graphene layer is uniformly distributed or not, and checking the concentration of the dispersion liquid, or checking the actual layer thickness; the dispersion state of the graphene dispersion liquid is judged, the reason for uneven distribution of the graphene layer is determined, and the ultrasonic treatment duration or spraying parameters are adjusted; spraying parameters are adjusted according to whether the actual layer thickness meets the curing requirement or not, or drying and curing are conducted; determining the curing degree of the graphene coating, winding the film roll material into a capacitor core package, or carrying out thermal stability test on the capacitor core package, calling back the judgment standard of the conductive state of the coating and the distribution of the graphene layer, and adjusting the initial detection length; according to the invention, the working temperature of the capacitor is reduced by coating the high-thermal-conductivity graphene material.

The present application relates to a voltage driving circuit and system and a household appliance. The voltage driving circuit includes a diode; a thin film capacitor; a resonant circuit configured to be connected to a three-phase power supply and enter a non-resonant operating state in a case where a working current of a load is greater than a present current; a rectifier circuit, of which an input end is connected with the resonant circuit; a switch device, of which a first end is connected with a first output end of the rectifier circuit and an anode of the diode, a second end is connected with a second output end of the rectifier circuit and a first end of the thin film capacitor, wherein a cathode of the diode is connected with a second end of the thin film capacitor; an inverter circuit connected with the first end of the thin film capacitor and the second end of the thin film capacitor, and configured to be connected to the load; and a control device, connected with a control end of the switch device, the resonant circuit, and the inverter circuit.

The utility model belongs to the technical field of controllers, and provides a dual-motor controller, which comprises a box body, a magnetic ring fixing seat, an inverter brick and a PDU assembly. Wherein the magnetic ring fixing seat and the inversion brick are installed in the box body and located on one side of the inversion brick, and the PDU assembly is installed at the bottom of the box body. According to the utility model, the heat dissipation grooves are arranged on the upper and lower surfaces of the water cooling plate, and the two groups of IGBT modules are arranged on the corresponding heat dissipation grooves and share one water cooling plate, so that the length of a flow channel is shortened, and the size of the controller is reduced; according to the utility model, the first IGBT module and the second IGBT module can share one thin-film capacitor, so that the material cost and the size of the controller are greatly reduced; according to the utility model, the PDU is independently assembled in the shell to form the PDU component, and the PDU component can be integrally assembled on the dual-motor controller or not integrally assembled according to different requirements of boosting functions of products, so that the flexible compatibility of the products is realized, and the universal adaptability of the products is improved.

The invention provides a heterogeneous laminated film capacitor and a preparation method and application thereof, the heterogeneous laminated film capacitor comprises a substrate, a dielectric layer, at least one composite layer and an electrode layer which are sequentially laminated, or the heterogeneous laminated film capacitor comprises a substrate, at least one composite layer and an electrode layer which are sequentially laminated; the composite layer comprises a ferroelectric layer and a dielectric layer which are stacked, the ferroelectric layer is close to the substrate, and the dielectric layer and the ferroelectric layer are coherent. According to the heterogeneous laminated film capacitor, through the arrangement of the ferroelectric and dielectric laminated structure, the homogeneity of the film capacitor can be improved in a simple and convenient manner, so that the linetype is optimized, and the energy storage density, efficiency and breakdown voltage of the heterogeneous laminated film capacitor are improved.

The utility model discloses a radiating fin type organic film capacitor, which belongs to the technical field of capacitors, and comprises a packaging metal shell, a core group arranged on the bottom surface of the packaging metal shell, and packaging epoxy resin arranged on the bottom surface of the packaging metal shell. A plurality of cooling fins are arranged on the top face of the packaging metal shell in an extending mode, and two outgoing lines are arranged on the outer wall of the packaging metal shell. According to the cooling fin type organic thin-film capacitor, the contact area with air is increased through the cooling fins to transmit heat, so that the temperature of the capacitor is reduced, the heat of the device is dissipated more quickly, the working temperature is effectively reduced, the applicability is improved, premature failure caused by high temperature is avoided, and the use is facilitated.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof. The polypropylene composite material comprises the following raw materials: polypropylene and an organic semiconductor master batch, the polypropylene composite material is prepared by adding the organic semiconductor master batch into the polypropylene, the polypropylene composite material is used for preparing the BOPP capacitor film, and then the BOPP capacitor film is used for preparing the thin-film capacitor, so that the high-temperature resistance of the thin-film capacitor can be remarkably improved.