1423 results about "Film capacitor" patented technology

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.

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 embodiment of the invention provides an inverter, a motor controller and a vehicle, and the inverter comprises an integrated drive control board which comprises a drive part and a control part which are disposed on the same circuit board; the onboard current sensor is used for detecting direct current and converting the direct current into three-phase alternating current; the integrated liquid cooling heat dissipation capacitor comprises a high-voltage film capacitor and a liquid cooling heat dissipation device, and at least part of the high-voltage film capacitor is in contact with the liquid cooling heat dissipation device. At least part of the power semiconductor device is in contact with the liquid cooling radiator, the high-voltage film capacitor is connected with a positive electrode and a negative electrode of an upper bridge of the power semiconductor device through a positive electrode switching copper bar and a negative electrode switching copper bar respectively, and a lower bridge of the power semiconductor device is connected with the three-phase copper bar. The integrated liquid cooling heat dissipation capacitor and the liquid cooling heat dissipation device are arranged to dissipate heat of the power semiconductor device and the high-voltage thin film capacitor, and the high-voltage thin film capacitor and the power semiconductor device can be dissipated at the same time through one liquid cooling heat dissipation device.

The invention provides a thin-film capacitor and a preparation method thereof, and relates to the technical field of capacitors, in the invention, when a capacitor core is subjected to heat setting, inert gas is used as heat conduction gas, and the inert gas is used for filling a space between film layers of the thin-film capacitor, so that water vapor between the film layers of the thin-film capacitor can be removed; the inert gas is relatively stable and is not easy to ionize under the action of electric stress and thermal stress, so that the loss of the thin-film capacitor can be reduced. Besides, in the final stage of heat setting heating, multiple times of cooling-heating treatment are carried out in a certain temperature range, so that the metalized film in the capacitor core repeatedly expands with heat and contracts with cold, water vapor in the metalized film material can be removed, and the heat-insulating performance of the capacitor core is improved. Therefore, the loss of the thin-film capacitor is further reduced. In conclusion, the thin-film capacitor manufactured by the method is low in loss, and the service life of the capacitor is prolonged.

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.

The invention relates to the field of thin film capacitors, and discloses a composite thin film and a preparation method and application thereof. The composite film is formed by thermal crosslinking of a high-temperature dielectric material and a piezoelectric ferroelectric polymer. Wherein the high-temperature dielectric material is polyimide or polyetherimide; the piezoelectric ferroelectric polymer is selected from cyanoethyl cellulose or polyvinylidene fluoride-trifluoroethylene-chlorofluoroethylene (P (VDF-TrFE-CFE)), polyvinylidene fluoride (PVDF) and polyvinylidene fluoride-trifluoroethylene (P (VDF-TrFE)), and the piezoelectric ferroelectric polymer is selected from polyvinylidene fluoride-trifluoroethylene (P (VDF-TrFE)) and polyvinylidene fluoride-trifluoroethylene (P (VDF-TrFE)); wherein the mass ratio of the high-temperature dielectric material to the piezoelectric ferroelectric polymer is 1: (0.00036-0.1). When the composite film is applied to a film capacitor, the effects of high dielectric constant and high breakdown strength, and improvement of thermal stability, thermal conductivity and energy storage performance can be achieved.

The invention belongs to the technical field of dielectric film materials, and particularly relates to a preparation method of a polypropylene film for a film capacitor, which comprises the following steps: S1, preparing a casting sheet; s2, primary synchronous stretching; s3, carrying out primary transverse stretching; s4, carrying out secondary transverse stretching; s5, carrying out secondary synchronous stretching; and S6, post-processing. The preparation method of the polypropylene film can be used for preparing the ultra-wide polypropylene film for the film capacitor, which is uniform in thickness, high in longitudinal tensile strength, high in transverse elongation rate and low in thermal shrinkage rate.

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 utility model provides a printed circuit board of a multi-level circuit and a power converter, the multi-level circuit comprises a plurality of bus capacitors, a plurality of switching devices and at least one thin-film capacitor, the plurality of bus capacitors and the plurality of switching devices are connected to form the multi-level circuit, the thin-film capacitor is connected in parallel with one bus capacitor, and the thin-film capacitor is connected in parallel with the other bus capacitor. The printed circuit board comprises a core device area, the switching devices and the thin-film capacitors are arranged in the core device area, and the bus capacitors are located outside the core device area. The thin-film capacitor is introduced and located in the core device area, the current path between the thin-film capacitor and each switching device is shorter, and the commutation path in the commutation process can be shortened, so that the path stray inductance is reduced, the inverse peak is reduced, and the service life of the device is prolonged.

To provide a thin film capacitor having a large capacitance. A thin film capacitor includes a metal foil having roughened main surfaces, a dielectric film covering the main surfaces, an electrode layer contacting the metal foil through an opening formed in the dielectric film and having a surface formed as a metal terminal, an electrode layer contacting the dielectric film without contacting the metal foil and having a surface formed as a metal terminal, and an electrode layer contacting the dielectric film without contacting the metal foil. The electrode layers include a conductive polymer layer contacting the dielectric film.

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 invention relates to a flame-retardant breakdown-resistant metallized film and a capacitor, the flame-retardant breakdown-resistant metallized film comprises an aluminum shell, a capacitor core and an epoxy resin layer for packaging the capacitor core, and the capacitor core is formed by winding and metal spraying the flame-retardant breakdown-resistant metallized film; and preparing a metal coating on the surface of the flame-retardant modified insulating film through a vacuum coating process. According to the flame-retardant breakdown-resistant thin-film capacitor, through a manufacturing process of modifying an existing insulating base film, adding a flame retardant into polymer particles, and then spraying a corona auxiliary liquid on the thin film to be matched with corona treatment, the defects that the hot shrinkage rate of the thin film is too large and the impact strength is low due to the addition of the flame retardant can be overcome; and finally, the flame retardance and the breakdown resistance of the thin film capacitor are remarkably improved.

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 relates to a high-humidity-resistant and large-current-resistant thin-film capacitor which comprises a capacitor shell, a thin-film capacitor core, a capacitor end cover and pins, a resin injection hole is formed in the center of the capacitor end cover, and the capacitor shell is filled with a compact epoxy resin layer which completely wraps the thin-film capacitor core. An epoxy resin layer is further filled between the capacitor end cover and the compact epoxy resin layer, and megasonic vibration is applied to a liquid epoxy resin adhesive and negative pressure air exhaust is carried out in the process that the liquid epoxy resin adhesive is cured into a solid epoxy resin adhesive by the compact epoxy resin layer. The high-humidity-resistant and high-current-resistant thin film capacitor still has excellent high-current resistance even in a high-humidity environment, and the compact epoxy resin layer for packaging is compact in structure, low in internal bubble content, good in insulativity and high in compression strength.

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.

To provide a thin film capacitor having high adhesion with respect to a circuit substrate. A thin film capacitor includes: a metal foil having a roughened upper surface; a dielectric film covering the upper surface of the metal foil and having an opening through which the metal foil is partly exposed; a first electrode layer contacting the metal foil through the opening; and a second electrode layer contacting the dielectric film without contacting the metal foil. An angle θa formed by the other main surface of the metal foil and a side surface thereof is more than 20° and less than 80°. The side surface is thus tapered at an angle of more than 20° and less than 80°, so that it is possible to suppress warpage and to enhance adhesion with respect to a multilayer substrate when the thin film capacitor is embedded in the multilayer substrate.

The invention belongs to the related technical field of capacitor life prediction, and particularly relates to a metallized film capacitor life prediction method, which comprises the following steps: carrying out an aging simulation test on a sample capacitor, cooling the sample capacitor after each round of test, measuring the capacitance of the sample capacitor, and calculating the capacitance attenuation value under each round; when the capacitance attenuation value and the number of turns reach preset values, fitting to obtain a linear relationship between the number of turns and the capacitance attenuation value, thereby obtaining a corresponding turn when the capacitance is attenuated to a performance deterioration index, and obtaining attenuation duration according to the turn; wherein the preset value corresponding to the capacitance attenuation value is smaller than the performance deterioration index; and according to the attenuation duration and other simulation experiment parameters and actual working condition data required by the capacitor failure life evaluation and prediction theoretical model, calculating the service life of the metallized film capacitor under the actual working condition by adopting the capacitor failure life evaluation and prediction theoretical model. The method can simply and conveniently predict the operation life of the metallized film capacitor.

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.

To provide a thin film capacitor in which warpage is less likely to occur. A thin film capacitor includes: a metal foil having roughened upper and lower surfaces; a dielectric film covering the upper surface of the metal foil and having an opening through which the metal foil is partly exposed; a dielectric film covering the lower surface of the metal foil and made of a dielectric material having a thermal expansion coefficient smaller than that of the metal foil; a first electrode layer contacting the metal foil through the opening; and a second electrode layer contacting the first dielectric film without contacting the metal foil. The lower surface of the metal foil is thus covered with the dielectric film having a small thermal expansion coefficient, thereby making it possible to prevent the occurrence of warpage.

The invention relates to a halogen-free flame-retardant metallized film capacitor which comprises an aluminum shell, a capacitor core located in the aluminum shell and a resin packaging layer used for carrying out insulation packaging on the capacitor core, the resin packaging layer is prepared by curing benzoxazine resin glue, and the benzoxazine resin glue is prepared by mixing 100 parts by mass of 4, 4 '-dibenzoxazine with 100 parts by mass of 4, 4'-dibenzoxazine. The material is prepared by uniformly mixing 20-25 parts by mass of 4, 4 '-diaminodiphenylmethane benzoxazine, 20-25 parts by mass of a curing agent, 0.5-0.7 part by mass of an accelerant, 15-20 parts by mass of filler, 3.5-5 parts by mass of a flame retardant and 100-150 parts by mass of a solvent. The halogen-free flame-retardant metallized film capacitor meets the halogen-free requirement, and is good in flame retardance, very low in total smoke release amount and high in heat resistance.

A film capacitor includes a stack including at least one dielectric film and a plurality of metal films, the at least one dielectric film including a polyarylate film, wherein each of the at least one of dielectric film and each of the plurality of metal films are alternately stacked in a stacking direction, each of the plurality of metal films deposited on each of the at least one dielectric film by vapor deposition, cover films on two first side surfaces, the two first side surfaces facing each other in a first direction, the first direction orthogonal to the stacking direction, the cover films containing a polyester hot-melt resin, and metal-sprayed electrodes on two second side surfaces, the two second side surfaces facing each other in a second direction, the second direction perpendicular to the first direction and orthogonal to the stacking direction.

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.