127 results about "Electrolytic capacitor" patented technology

The invention discloses an inverter bus ripple active suppression method and system. The method comprises the following steps: collecting bus voltage and current, and extracting a broadband ripple frequency spectrum; inputting the broadband ripple frequency spectrum and the operation data of the inverter into a physical degradation model, and predicting the service life state of the electrolytic capacitor; a dynamic frequency tolerance threshold matrix is constructed through the predicted service life state of the electrolytic capacitor, and a sensitive frequency band of the electrolytic capacitor is identified; threat degree evaluation is carried out on each sensitive frequency band, and a frequency-varying virtual impedance network used for inverting a compensation voltage reference instruction is constructed according to an evaluation result; and according to the generated compensation voltage reference instruction, an inverter power switch tube is driven to generate corresponding compensation voltage. The system is used for implementing the method. The beneficial effects of the invention are that the ripple suppression is converted into a dynamic complementation problem between the capacitance physical impedance degradation amount and the inverter virtual impedance compensation amount, and the reliability and economical efficiency of an inverter system are greatly improved.

A solid electrolytic capacitor includes a laminate in which capacitor elements each including an anode foil, and cathode foils are laminated, an exterior resin covering the laminate and having a first end face on which a part of each anode foil is exposed and a second end face on which a part of each cathode foil is exposed, an anode external electrode electrically connected to each anode foil at the first end face, and a cathode external electrode electrically connected to each cathode foil at the second end face. A first average distance from an end point on the second end face to the respective cathode foils in the lamination direction on the mounting surface side of the exterior resin is smaller than a second average distance from the end point to the respective cathode foils in a region where the capacitor elements and the cathode foils overlap.

An electrolytic capacitor including-includes an anode body that is porous, an anode wire including a buried part buried in the anode body and a protrusion part protruding to an outside of the anode body, a dielectric layer disposed on a surface of the anode body, a cathode part covering at least a part of the dielectric layer, an anode terminal electrically connected to the anode wire, and a cathode terminal electrically connected to the cathode part. A corner defined by three sides of the anode body is chamfered by an intersecting surface intersecting each of the three sides, the three sides intersecting each other. The protrusion part is protruded from the intersecting surface and is connected to the anode terminal.

The utility model discloses a kind of drive circuits, belong to electric bicycle instrument technical field, specifically related to a kind of electric bicycle instrument drive circuit, comprising: conversion module, output filter and high voltage surge suppression module;Output filter and high voltage surge suppression module are connected with conversion module;Conversion module includes: MOS tube Q6, MOS tube Q9, resistance R20, resistance R19, resistance R18, triode Q5 and triode Q10;Output filter includes: inductance L2, electrolytic capacitor C15, electrolytic capacitor C14, capacitor C13;High voltage surge suppression module includes: transient voltage suppression diode D5;The utility model uses wide input voltage range, high-efficiency switching power supply, replaces traditional linear voltage stabilizer, and efficiency is higher, and heat is smaller, and tolerance to input voltage fluctuation is better, while increasing greater capacity input electrolytic capacitor, effectively absorb transient surge and fill transient voltage drop, in addition, TVS diode is used to suppress high voltage surge, and self-recovery fuse is used to prevent overcurrent.

By improving the conductivity efficiency, the temperature rise at the crimped portion is suppressed, providing an electrolytic capacitor with excellent reliability, and a method for manufacturing an electrolytic capacitor. [Solution] The electrolytic capacitor according to the present invention comprises an anode foil, a cathode foil, a separator, and lead terminals connected to the anode foil and the cathode foil, respectively. The lead terminal consists of a terminal portion, a lead wire, and a connection portion. The terminal portion has at least two crimped connection portions, which are perforated in a state where it is superimposed on the anode foil or the cathode foil, bent toward the anode foil or the cathode foil, and press-connected. The diameter of the press-connected crimped bent portion of the first crimped connection portion on the lead wire side of the terminal portion is larger than the diameter of the bent portion of the second crimped connection portion. The ratio of the diameter of the bent portion of the first crimped connection portion to the crimping distance between the first crimped connection portion and the second crimped connection portion is 1:0.9 to 1:1.3.

This invention provides a high-voltage suppression and voltage regulation protection circuit, relating to the field of circuit protection technology. The circuit includes a high-voltage discharge elimination circuit, a π-type composite EMI filter network circuit, and a voltage regulator circuit connected in sequence, with terminals at both the input and output ends. The high-voltage discharge elimination circuit consists of four DC spark discharge tubes and two varistors. The π-type composite EMI filter network circuit includes two high-voltage ceramic capacitors, two inductors, and one common-mode inductor. The voltage regulator circuit consists of an electrolytic capacitor and a Zener diode. Through the synergistic effect of the front-stage high-voltage elimination, intermediate-stage filtering, and rear-stage voltage regulation, the circuit achieves suppression and voltage regulation protection against high-voltage interference ranging from kilovolts to tens of kilovolts, ensuring continuous normal operation of the circuit system under harsh high-voltage environments.

This invention discloses a silver paste material for low ESR stacked solid-state capacitors, its preparation method, and the capacitor thereof. The silver paste material is prepared by a method comprising the following steps: S1, organic carrier preparation: mixing a main solvent, a co-solvent, a dispersant, and a plasticizer to obtain an organic carrier; S2, low-speed mixing: first adding all the required proportions of spherical silver powder to the organic carrier and stirring at low speed, then adding flake silver powder in batches and continuing to stir until a uniform paste is formed. By weight percentage, the components of the silver paste material include: 20%~35% flake silver powder, 20%~30% spherical silver powder, 10%~20% main solvent, 2%~4% co-solvent, 13%~30% binder, 2%~4% dispersant, 1%~3% defoamer, and 1%~3% plasticizer. This invention protects the morphological integrity of flake silver powder, forming a dense conductive network. The total silver powder content can be as low as 40wt%. The preparation process is simple, reducing material costs and achieving the best balance between electrical performance and cost. It is suitable for high-power applications such as AI servers, 5G communications, and new energy vehicles.

1. Name of the product in this design: End face of a solid electrolytic capacitor. 2. Purpose of this design: As a capacitor. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D rendering 2. 5. Other situations requiring explanation: Solid lines indicate areas requiring protection, while dashed lines indicate areas not requiring protection. The dashed line indicates the boundary between the protected area and other parts. This design is for the end face of a solid electrolytic capacitor, where the anode and cathode lead frames are fixed with molding resin. The lead frame is exposed on the end face and bottom face, and on the end face, the lead frame is substantially flush with the molding resin.

The objective is to provide a solid electrolytic capacitor that has sufficient lifespan characteristics under high-temperature conditions. [Solution] A solid electrolytic capacitor is provided, having an anode foil, a cathode foil, and a separator between them, with an oxide film formed on their surfaces, and having an electrolyte portion in the gap between the anode foil and the cathode foil, wherein the electrolyte portion is composed of a solid electrolyte containing a conductive polymer compound, a polyanion dopant, an aromatic nitro compound having a polar group, and a secondary dopant as an optional swelling agent.

A capacitor and supercapacitor design are based on metal-foam electrodes. An electrolytic capacitor has a metal foam dielectric (e.g., aluminum oxide, titanium oxide, iron oxide, or others). An electric double-layer supercapacitor has an electrode with metal foam (e.g., copper, nickel, titanium, iron, steel alloy, or aluminum) filled with activated carbon, or graphene, or metal foam with activated carbon foam, or any combination of these to enhance the electrical conductivity and thus the power and capacity of the cell. A pseudocapacitor device has an electrode with metal foam (e.g., iron, cobalt, nickel, copper, titanium, aluminum, magnesium, tin, manganese, and stainless steel, and their alloy foams) coated with an oxide-or hydroxide-based material containing highly active zones. The pseudocapacitor metal-foam electrode can also be filled with activated carbon in the form of a slurry to further enhance its capacity.

A solid electrolytic capacitor includes: an element stack, an anode terminal, a cathode terminal, and an outer member covering the element stack, the anode terminal, and the cathode terminal in a state where a part of each of the anode terminal and the cathode terminal is exposed. The element stack has a plurality of capacitor elements stacked with each other, and a conductive material interposed between adjacent two capacitor elements among the plurality of capacitor elements. Each of the plurality of capacitor elements includes an anode portion and a cathode portion, and the conductive material is disposed on the cathode portion. The anode terminal is connected to the anode portion. The cathode terminal is connected to the cathode portion via a conductive paste. In addition, the cathode terminal has an opposing surface opposing a front end of the element stack with a gap therebetween, and a seal material is filled in at least a part of the gap.

This invention provides a multi-level LED driving circuit for dimming and color temperature adjustment, including a first LED group, a second LED group, and a color-tuning LED component. The first LED group is connected to the upper N-1 positions of a multi-level switch, and the second LED group is connected to the N-1 positions of the multi-level switch, where N is the total number of positions of the multi-level switch, and one of the positions connected to the first and second LED groups does not overlap. The second LED group is connected to the position overlapping with the first LED group through resistors of different resistance values. The color-tuning LED component is connected to the second lower position of the multi-level switch, and the remaining lower positions of the multi-level switch are connected to the negative terminal of electrolytic capacitor C1. The positive terminal of electrolytic capacitor C1 is connected to the positive terminals of the first LED group, the second LED group, and the color-tuning LED component. This invention also provides an LED lamp equipped with the driving circuit described above.

An electrolytic capacitor according to the present invention comprises a capacitor element and a liquid component impregnated in the capacitor element. The capacitor element includes: an anode foil provided with a dielectric layer; a cathode foil; a wound body obtained by winding a separator interposed between the anode foil and the cathode foil; a first electroconductive polymer layer formed on the separator; and a winding stop tape for fixing a winding end portion of the wound body. The coating amount of the first electroconductive polymer layer on the separator is 0.04 mg / cm2 or more. A lactone compound is present in the liquid component in a proportion of 40 mass% or less.

The utility model discloses a kind of assembled motor controllers, including: the casing with bottom wall and the cover plate being set on the casing, motor drive circuit board including power circuit board, peripheral and control circuit board located above power circuit board are provided in casing, peripheral and control circuit board are provided with peripheral circuit, power interface, motor interface, signal transmission interface and at least one interboard connection female, peripheral circuit includes several electrolytic capacitors, several power devices and the interboard connection pin corresponding to interboard connection female one-to-one are provided in power circuit board, power interface is arranged in the lateral wall of casing, motor interface and signal transmission interface are arranged in the cover plate. The assembled motor controller of the utility model can be directly plugged into the motor, the structure is very compact, greatly facilitates installation, and saves cost.

This invention relates to power electronic conversion technology, aiming to provide a three-port single-stage bidirectional DC-AC converter with photovoltaic, energy storage, and charging capabilities, and its control method. It includes a public grid interface unit and two DC port power units connected to different DC sources. The former includes a grid-side full-bridge circuit, a power frequency polarity reversal circuit, and a filter circuit, with the output terminal on the public grid side led out from the power frequency polarity reversal circuit. The latter includes an input filter capacitor, a full-bridge circuit, and a high-frequency transformer. The input filter capacitor is connected in parallel across the DC source and the full-bridge circuit, and the output midpoint of the full-bridge circuit is connected to the primary winding of the high-frequency transformer. The secondary windings of the high-frequency transformers in the two DC port power units are connected in parallel, and their common connection point is connected to the midpoint of the bridge arm of the grid-side full-bridge circuit. This invention completely eliminates the intermediate high-voltage DC bus and large-capacity electrolytic capacitor, structurally improving power density and long-term reliability; it can flexibly support various complex operating modes.

An electrolytic capacitor element including: a valve-acting metal substrate including a core portion made of metal foil and a porous portion along a surface of the metal foil; a dielectric layer on the porous portion; a solid electrolyte layer on the dielectric layer; and a conductive layer on the solid electrolyte layer, the conductive layer including a carbon layer, the carbon layer containing a carbon filler and a scaly insulating inorganic filler, wherein, in a cut section of the electrolytic capacitor element in a direction perpendicular to a main face of the metal foil, an average of acute angles between a longitudinal direction of a cross-section of the insulating inorganic filler in the carbon layer adjacent to the main face of the metal foil and a longitudinal direction of a cross-section of the metal foil is 0° to 45°.

This utility model discloses an aluminum shell structure for an electrolytic capacitor, including a capacitor core package. A shell is provided at the outer end of the core package, and a support strip is provided inside the shell. Multiple sets of support strips are arranged around the shell. A cover is provided on top of the shell, and the cover cooperates with the shell. A pressure-relief column is provided inside the cover. A protective strip is provided inside the support strip, and a protective pad is provided inside the pressure-relief column. A partition cavity is opened inside the shell, and a vent hole is opened inside the shell. A pressure relief pipe is provided at the outer end of the shell, and a movable piston is provided inside the pressure relief pipe. A pressure-applying spring is provided between the movable piston and the wall of the pressure relief pipe. A pressure relief hole is opened at one end of the pressure relief pipe. This aluminum shell structure provides better shock resistance, suppresses explosions, stabilizes rise, and improves protection capabilities.

Disclosed is an electrolytic capacitor including: an electrode foil; and a lead member that is connected to the electrode foil. The lead member includes a lead wire and a plate-shaped tab portion that is provided at one end portion of the lead wire. The tab portion has a surface with an arithmetic average roughness Ra of 4 μm or more. The electrode foil and the lead member are connected by a crimping portion in an overlapping portion in which the tab portion and the electrode foil overlap each other when the electrode foil is placed on the surface of the tab portion.

This utility model belongs to the technical field of producing aluminum shells for electrolytic capacitors, specifically relating to a turnover box conveying and turning device and an aluminum shell production line. The turning device includes a conveyor belt, a rotary motor, and a rotating shaft. Each end of the rotating shaft is rotatably connected to a bearing seat, and the shaft is mounted between two support frames. Clamping arms A and B are fixed to the inner ends of the rotating shaft rotatably connected to the bearing seats, respectively. Each clamping arm A and clamping arm B has a clamping cylinder fixed to its inner side, and the clamping cylinders clamp the turnover box in contact with the turnover box. This utility model not only controls the stability of the turnover box turning operation but also ensures that the turnover box moves smoothly onto the conveyor belt after the turning operation is completed. This reduces the difficulty of turning the turnover box and improves the efficiency of the turning operation, thereby ensuring the efficiency of the flow of operations between aluminum shell production processes and meeting the automation requirements of aluminum shell production.

The present invention provides a motor control device that can easily achieve miniaturization while securing the insulation distance between a busbar and a substrate. The motor control device according to the present invention includes a printed circuit board 20 on which a switching element 22 is surface-mounted; busbars 31 and 32 that are surface-mounted on the printed circuit board 20 and are connected to the switching element 22; and an electrolytic capacitor 60 that is electrically connected to the switching element 22 via the busbars 31 and 32. The busbars 31 and 32 have main bodies 41 and 51 connected to the printed circuit board 20, and busbar terminals 42 and 52 that are linked to the main bodies 41 and 51 and are connected to the electrolytic capacitor 60. The busbar terminals 42 and 52 have rising portions that rise from a surface 20b of the printed circuit board 20, and capacitor connection portions 47 and 57 that are bent and extend from the tips of the rising portions toward the electrolytic capacitor 60 and are connected to the electrolytic capacitor 60.

An electrolytic capacitor including a capacitor element having an anode part and a cathode part, a cathode foil electrically connected to the cathode part, and a package body sealing the capacitor element. The capacitor element and the cathode foil are stacked together, constituting a stack in which the cathode part of the capacitor element is electrically connected to the cathode foil. The package body contains an epoxy resin. The thickness of the package body located above or below the stack in a stacking direction of the stack is 24.9% or more of the thickness of the stack in the stacking direction.

The electrolytic capacitor of this application comprises a capacitor element and a liquid component. The capacitor element comprises: an anode foil having a dielectric layer; a cathode foil disposed opposite to the dielectric layer; a spacer between the anode foil and the cathode foil; and a conductive polymer layer disposed between the anode foil and the cathode foil and in contact with the spacer. The liquid component comprises a polymer compound, the polymer compound comprising a first component having a mass-average molecular weight Mw of 200 or more and 2000 or less, and the polydispersity (Mw / Mn) ratio of the mass-average molecular weight Mw to the number-average molecular weight Mn is 1.35 or less.

This invention provides a pre-charging circuit based on motor control and an electric garden device. The pre-charging circuit includes a current limiting module, a discharge module, a voltage detection module, an electrolytic capacitor C1, a main MOSFET Q1, and an MCU. When there is a large-capacity electrolytic capacitor between the positive input terminal P+ of the motor and ground (GND), the pre-charging circuit can prevent arcing between the battery pack terminals and the tool terminals or between the switch contacts when the lithium battery pack is inserted or when power is applied. This effectively protects the contact parts, prevents the terminals from melting, and improves the tool's lifespan and user experience. The circuit self-test module (discharge module and voltage detection module) ensures stable and reliable operation of the pre-charging circuit. When an abnormality occurs, it can promptly report an error, preventing the tool from starting.

The application discloses a preparation method of high-liquid-absorption electrolytic capacitor paper. First, coniferous wood pulp is prepared into pulp, and then oxygen in the pulp is removed; an initiator is added into the pulp, and after uniform stirring, a fiber modification reagent is added, and after reaction, modified pulp is obtained; the pulp is washed thoroughly, and then wet papermaking is performed, so that the high-liquid-absorption electrolytic capacitor paper is obtained, wherein the fiber modification reagent is selected from one or more of N,N-dimethyl acrylamide, dimethylaminopropyl acrylamide, di[2-(acryloyloxy)ethyl] phosphate, 2-acrylamido-2-methylpropanesulfonic acid and maleic acid. The method of grafting polar groups on the surface of cellulose is adopted, so that the content of free groups on the surface of cellulose is increased, and the newly introduced groups are polar groups, and the hydrophilicity is higher than that of hydroxyl groups, so that the liquid absorption capacity of the electrolytic capacitor paper is improved.

The application provides a LED constant current driving system, comprising: a voltage input module providing an input voltage; a first diode, an anode of which is connected with the input voltage, and a cathode of which is connected with an upper plate of an electrolytic capacitor and a positive pole of an LED load; a leakage current control module providing a leakage current for maintaining a thyristor conduction; a constant current control module performing adaptive ripple elimination control on a current flowing through the LED load; a charging current control module performing control on a charging current of the electrolytic capacitor to realize frequency flash elimination control of the LED load; and a minimum clamping current setting circuit. The system has high efficiency, the minimum clamping current setting circuit is simple and has low cost; the overvoltage compensation technology of a compensation loop is adopted to enable the LED output to remain without frequency flash at low input voltage; the reference voltage is adjusted when the thyristor is dimmed, and the system reliability is improved; and the functional modules are commonly controlled and can be integrated in one chip.

An electrolytic capacitor includes a porous anode body, a dielectric layer formed on a surface of the anode body, and a conductive polymer and a salt compound that are filled inside pores of the anode body. L is a shortest distance from a center of the anode body to a first principal surface of the anode body, the first principal surface being closest to the center, and a region in which a minimum value of respective distances to principal surfaces of the anode body is L / 3 or less, and a region in which the minimum value is 2L / 3 or more, are defined as a surface layer part and a central part, respectively, inside the anode body. A ratio B / A of an ion strength B derived from the salt compound to a sum A of all ion strengths measured by time-of-flight secondary ion mass spectrometry (TOF-SIMS) in a cross section that passes through the center and that is perpendicular to the first principal surface is defined as an ion strength ratio. A ratio R2 / R1 of an ion strength ratio R2 in the central part of the anode body to an ion strength ratio R1 in the surface layer part of the anode body is 0.15 or more.

A solid electrolytic capacitor includes at least one capacitor element, the capacitor element comprising: an anode body having a porous portion at least on its surface; a dielectric layer covering at least a portion of the surface of the anode body; and a solid electrolyte layer covering at least a portion of the dielectric layer, the solid electrolyte layer having: a first portion filling the voids of the porous portion in the anode body having the dielectric layer; and a second portion protruding from the main surface of the anode body having the dielectric layer, the first portion comprising a self-doped conductive polymer and comprising an antioxidant.

The application relates to the field of static reactive power generators, in particular to a current limiting method and system of a static reactive power generator based on a capacitor parameter, which collects power parameters of an alternating current side and a direct current side of the static reactive power generator respectively; determines a current parameter of the direct current side according to the power parameters; establishes a discrete time equation according to the current parameter and the power parameter of the direct current side; obtains a capacitor parameter of the direct current side according to the discrete time equation; determines a current limiting ratio according to the capacitor parameter of the direct current side; determines an output reference current of the static reactive power generator according to the current limiting ratio and a current state of a load to be compensated; and performs a current limiting operation on the static reactive power generator according to the output reference current. The application can monitor the capacitance value of an electrolytic capacitor in real time online, limit the output current according to the attenuation of the capacitance value, and thus can still limit the capacitance when the electrolytic capacitor attenuates, so that the safe operation of the static reactive power generator is ensured and the service life is prolonged.

A solid electrolytic capacitor includes a solid electrolytic capacitor element and an exterior body that seals the solid electrolytic capacitor element. The solid electrolytic capacitor element includes an anode body including a first end part and a second end part that is disposed opposite to the first end part, a dielectric layer covering at least a part of the anode body, and a cathode part covering at least a part of the dielectric layer. The at least a part of the dielectric layer is disposed on a portion of the anode body that is closer to the second end part than to the first end part. The cathode part includes a solid electrolyte layer covering the at least a part of the dielectric layer. A breaking strength of the solid electrolyte layer is 0.55 MPa or more and 45.00 MPa or less.

The application discloses a DC-link-free electrolytic capacitor single-phase three-phase input compatible bidirectional AC-DC converter, and belongs to the field of AC-DC converters in the field of power electronics. The topology of the application is composed of an input filter inductor, a three-phase full-bridge circuit and a full-bridge DAB circuit. When the three-phase input, the grid voltage is rectified through the three-phase full-bridge circuit, and a six times power frequency pulsating DC voltage is output as the input of the DAB converter, and only a small capacity film capacitor is needed for filtering at the input side of the DAB converter. When the single-phase input, the front two-phase bridge arms of the three-phase full-bridge are connected in parallel and then connected to the live line of the grid, the middle point of the third-phase bridge arm is connected to the zero line and works at a low frequency, and a two times power frequency steamed bun wave voltage is output after rectification as the input of the DAB converter. The control of the input AC current is realized by directly controlling the DAB input current, and the stable DC voltage of the DAB output is realized. The application realizes electrical isolation through a high-frequency transformer, has a simple structure, no DC bus electrolytic capacitor, and significantly improves the power density and service life.