40 results about "Magnetic core" patented technology

The invention provides a control method of a flyback converter. The control method is a control method in a mixed control mode; in other words, the flyback converter works in a non-complementation state under light loads, the clamp switch pipe on time is shortened through down conversion, and light load losses are effectively reduced through down conversion; flyback converter works in a fixed-frequency drive complementation state under heavy loads, and the clamp switch pipe on time is prolonged. Compared with the prior art, the control method has the advantages that the voltage stress of a main switch pipe and a clamp capacitor can be effectively reduced, the main switch pipe off losses can be reduced, the clamp circuit current change slope is decreased, the EMI interference is reduced, the secondary current change slope is decreased, and the longer detection reaction time is provided for synchronous rectification. Meanwhile, the working area of a magnetic core in the third quadrant is enlarged, the maximum flux density is reduced, and the size of the magnetic core is reduced.

A fixing device has a fixing belt, a trembler coil for heating the fixing belt with magnetic flux, a ferrite core around which the trembler coil is wound, and a heater for heating the ferrite core. The ferrite core has a Curie temperature which is between a fixing temperature of the fixing belt and a smoking start temperature of the fixing belt. The heating of the ferrite core with the heater allows the temperature of the ferrite core to reach the Curie temperature before the temperature of the fixing belt reaches a smoking start temperature. Thereby, an excessive rise in temperature of the fixing belt is suppressed, which prevents the fixing belt from smoking and igniting.

In a transformer including a coil part having a first bobbin to which a coil is mounted, a second bobbin to be fitted to the first bobbin combined to each other, the coil part being sandwiched between magnetic cores from above and below, the first bobbin includes at least one lead drawing through holes on a periphery on the inner peripheral side of a coil mounting surface, and at least one of coil-drawn-leads of the coil is drawn through the lead drawing through hole. With this transformer, coming out of the coil-drawn-lead, displacement, and erroneous wiring are prevented, and hence the inserting capability of the coil is improved. Therefore, the workability is remarkably improved, and hence a product which is low in price can be provided.

A fuel injector comprising a hollow body for housing a metering valve with a calibrated pipe for outlet of the fuel from a control chamber. The calibrated pipe is normally kept closed by a shutter controlled by an electromagnet comprising a magnetic core and an electric coil housed in an annular slot of the core. The coil outer cylindrical surface forms a gap with the annular slot so as to be lapped by the fuel coming out of the calibrated pipe. The coil comprises a bobbin having a pair of appendages for supporting electric supply plugs, which are englobed at least in part in a block of non-magnetic material. The bobbin has a substantially cylindrical rib, one flange adjacent to an end portion of the plugs, and another flange having a smaller diameter that forms a passage for the fuel between the calibrated pipe and the gap.

The invention discloses a preparation method of a MnZn (Manganese-Zinc) soft magnetic ferrite material containing modified nanoscale titanium dioxide. The preparation method comprises the following steps of: preparing main materials, preparing auxiliary materials, pre-burning, mixing and secondarily ball-milling the main materials and the auxiliary materials, shaping and sintering to obtain a MnZn soft magnetic ferrite magnetic core of modified nanoscale titanium dioxide. Through the addition of the modified nanoscale titanium dioxide, the MnZn soft magnetic ferrite material can play a bridge combination role among different raw materials; the used raw materials have the advantages of better distribution, high density, high grain boundary resistivity, low porosity and great and even grains; the prescription of the raw materials is reasonably improved, so that the magnetic core has higher magnetic conductivity after firing; and the indexes such as power loss, frequency feature, curie temperature, saturation flux density and the like are greatly improved.

A common mode choke coil comprises: a Mn—Zn ferrite core which is shaped square, forms a closed magnetic path, and which has an initial permeability of at least 3,000 at 100 kHz and at least 100 at 10 MHz, respectively, at room temperature; and first and second edgewise windings which are formed respectively of first and second rectangular insulated wires. The first edgewise winding is provided around a core leg of the Mn—Zn ferrite core, and the second edgewise winding is provided around a core leg of the Mn—Zn ferrite core located oppositely to the core leg having the first edgewise winding provided therearound. This structure enables the core characteristics to be fully utilized without an influence of stray capacity of winding.

The invention discloses an implantable medical device. The implantable medical device comprises a first wireless transceiving module positioned in a body and a second wireless transceiving module which is positioned outside the body and is used for communicating with the first wireless transceiving module and charging the first wireless transceiving module, wherein the first wireless transceiving module comprises a first coil, a titanium shell and a magnetic core arranged between the first coil and the titanium shell; and the upper and lower surfaces of the magnetic core are attached to the first coil and the titanium shell respectively. In the technical scheme, when the second wireless transceiving module positioned outside the body charges the first wireless transceiving module positioned in the body in a magnetic coupling mode, the magnetic core can change a path of a magnetic force line and prevent the magnetic force line from passing through the titanium shell so as not to form the eddy-current effect; therefore, the charging efficiency cannot be reduced, and the titanium shell cannot emit heat.

The invention discloses a novel high density integrated electric inductance manufacturing method, which comprises: (1) winding an varnished wire coil into a spiral shape; (2) making first iron magnetic powers into a magnetic core through mechanical pressing; (3) packing the magnetic core into a hollow cavity of the varnished wire coil; (4) packing the varnished wire coil packed with the magnetic core into an injection mold; (5) uniformly mixing and blending resin adhesive, coupling agent and accelerant to obtain high temperature resin adhesive; (6) uniformly mixing and blending the second iron magnetic powers and the high temperature resin adhesive to obtain magnetism composite material; (7) injecting the magnetism composite material into a mold cavity of the injection mold to mold, and solidifying to obtain external magnetic body; and (8) cooling and stripping to obtain molded electric inductance. According to the invention, the volume of the electric inductance manufactured with the method provided herein is small; the density is high; the relative magnetic conductivity is high; the cooling performance is good; the service life is long; the electric inductance is molded as a whole; and the manufacturing method of the electric inductance is simple, thus reducing the production cost.

The invention discloses a wide-range inductive frequency-modulation type displacement measurement device and a method. The device comprises a shell, a spiral coil, a measuring rod, a pipe body and a data processing module, wherein the spiral coil is arranged on the rear section of the pipe body in a sleeving manner; the data processing module is arranged on the shell; the front-end part of the measuring rod is formed by butting n sections of magnetic cores and can stretch into the pipe body; the magnetic conductivity of the ith magnetic core is 1.5-2 times that of the magnetic conductivity of the (i+1)th section of the magnetic core; i and n refer to integers; n is more than or equal to 2; i is equal to n-1; the length of each section of the magnetic core is smaller than the length of the spiral coil, so that two ends of a single section of the magnetic core stretch in the length range of the spiral coil; and the lengths of the tube body and the measuring rod are larger than the length of the spiral coil. The metal spiral coil with mature and stable process is used, the mode of continuously measuring by virtue of the multi-section measuring rod is adopted, the precision is guaranteed, the range can be widened, and the device is low in cost and easy to implement and can be widely applied to wide-range displacement deformation monitoring in the fields of civil engineering, geological disasters and industries.

A flexible transformer system includes conductive windings extending around a magnetic core of a transformer phase and impedance-varying windings extending around the magnetic core of the transformer phase. The conductive windings and the impedance-varying windings are configured to conduct electric current around the magnetic core of the transformer phase. The system includes an impedance switch coupled with the impedance-varying windings and with the conductive windings. The impedance switch is configured to change an impedance of the system by changing which impedance-varying winding of the impedance-varying windings is conductively coupled with the conductive windings and which impedance-varying winding of the impedance-varying windings is disconnected from the conductive windings.

The invention provides a passive stylus pressure signal processing system, comprising a pressure generating circuit and a pressure processing circuit arranged in a passive stylus; the pressure generating circuit includes a coil and a capacitor that form an LC resonant circuit, a magnetic core is arranged in the coil, and the magnetic core changes a relative position to the coil with vertical movement of a tip; the pressure processing circuit transmits a detection signal to the LC resonant circuit, and receives a feedback signal generated by the LC resonant circuit based on the detection signal; the pressure processing circuit calculates current resonant frequency of the LC resonant circuit in the passive stylus according to the feedback signal, and acquires current pressure of the passive stylus according to variation of the resonant frequency of the LC resonant circuit. The invention also provides a method and hand-drawing board using the passive stylus pressure signal processing system.

The invention discloses a self-coupling step-down compensation integrated soft start device which couples the two functions of a self-coupling transformer and a magnetic-valve type controllable reactor together through an ingenious circuit and magnetic circuit design, and relates to the start-up of an extra-high/ultra-high capacity high-voltage motor. A high-voltage side magnetic core and a low-voltage side magnetic core are completely the same in structure, the high-voltage side magnetic core is composed of a first iron core, a second iron core and a first side yoke, a first coil and a second coil are wound on the first iron core, a third coil and a third coil are wound on the second iron core, and the other end of each of the first coil and the third coil is connected with the other end of each of the second coil and the fourth coil in parallel; one end of a high-voltage side winding is connected with the positive pole of an input power supply, the other end of the high-voltage side winding is connected with the input end of a low-voltage winding and accessed to one end of a motor, and the other end of the low-voltage side winding is connected with the negative pole of the power supply and the other end of the motor. The self-coupling step-down compensation integrated soft start device is capable of smoothly changing the impedances of a high-voltage side and a low-voltage side, low in start current, small in size, stable in start performance, fast in response speed, and long in service life.

The invention discloses a self-excited push-pull type converter. More than two magnetic cores are combined into a whole to realize magnetic saturation which is same with that of an integral magnetic core so as to realize the conversion of a push-pull triode. The self-excited push-pull type converter is realized by the method that the magnetic cores are oppositely spliced in a staggered way, and mirror surfaces are used as the contact surfaces of the side surfaces of the magnetic cores; or the magnetic cores are baked at a high temperature; or the two magnetic cores are fused through electrification. The self-excited push-pull type converter has high conversion efficiency, excellent consistency and high reliability. Meanwhile, an obtained transformer has the characteristics of small size and simple winding technology.

Thermally annealed superparamagnetic core shell nanoparticles of an iron-cobalt ternary alloy core and a silicon dioxide shell having high magnetic saturation are provided. A magnetic core of high magnetic moment obtained by compression sintering the thermally annealed superparamagnetic core shell nanoparticles is also provided. The magnetic core has little core loss due to hysteresis or eddy current flow.

Provided is a single-stage single-phase voltage converter circuit structure with a cascade magnetic integrated switch inductance-capacitance network. The single-stage single-phase voltage converter circuit structure with the cascade magnetic integrated switch inductance-capacitance network is composed of an input direct current power source or single-phase alternating current power source, the magnetic integrated switch inductance-capacitance network, a high frequency combination modulation switch, a filter and a single-phase alternating current load or direct current load which are in cascadeconnection in sequence; the magnetic integrated switch inductance-capacitance network is composed of three energy-storage inductors and two identical SLCC-type two-port switch inductance-capacitancenetwork units, wherein the SLCC-type two-port switch inductance-capacitance network units are in cascade connection in sequence, and the energy-storage inductors and the SLCC-type two-port switch inductance-capacitance network units are connected in series; magnetic integrated structures of the energy-storage inductors are a three-inductor magnetic coupling structure, a three-inductor magnetic decoupling structure, and a magnetic coupling structure of one inductor with the other two inductors, and an EE-type magnetic core, a four-column magnetic core and an EE-type magnetic core are adopted respectively. The single-stage single-phase voltage converter circuit structure with the cascade magnetic integrated switch inductance-capacitance network can effectively convert an unstable wide-change-range low-voltage direct current or a single-phase alternating current into a stable and high-quality single-phase sine alternating current or a direct current in a single stage, and is applicable tomiddle and small-capacity electrical energy conversion sites.

Provided an error compensating method for an instrument transformer, in which an error of an instrument transformer is compensated by reflecting hysteresis characteristics of iron core. When such error compensation is performed, a hysteresis loop indicating the relationship between magnetic flux and excitation current is not used as it is, but core-loss resistances and magnetic flux-excitation current curves are used, thereby achieving more precise compensation. According to the present invention, an error of an instrument transformer can be significantly reduced. Therefore, it is possible to manufacture an instrument transformer with high accuracy and to significantly reduce the size of the instrument transformer. Further, a material with high permeability does not need to be used in order to increase the accuracy.

A spark plug connector, in particular for large engines, includes an inductive interference suppression device having a ferromagnetic core. The inductive interference suppression device also has at least one winding, preferably a coil, and an ohmic d.c. resistance of at least 20Ω at 20° C.

The invention provides detection impedance comprising a primary winding, a secondary winding and an output resistance connected with the secondary winding in parallel, wherein the primary winding has a magnetic core with high magnetic conductivity and high frequency response characteristics, and the primary winding is wound by metal of which the current-carrying capacity is above the preset one. Compared with the prior art, the detection impedance of the invention is suitable for high-pressure large-capacitance test objects, permits large measuring current and has high sensitivity.

A three-phase fault current limiter FCL has three spaced apart input terminals for electrically connecting to respective terminals of a transformer. Three output terminals electrically connect FCL with a load circuit which draws load current I_LOAD. FCL includes two longitudinally spaced apart generally circular High Temperature Superconducting (HTS) DC coils which have central generally cylindrical cavities. FCL also includes a longitudinally extending magnetically saturable core which has six like coextensive parallel and elongate posts. Each post includes a first longitudinal portion and, a second longitudinal portion and a third longitudinal portion extending longitudinally oppositely away from the first portion. Each second portion and third portion is received within one of the central cavities. Three copper-based insulated AC coils are each wound about respective first portions for carrying load current I_LOAD between input terminals to respective output terminals. DC coils magnetically bias the core such that, in response to one or more characteristics of the load current I_LOAD, the AC coils move from a low impedance state to a high impedance state.

The invention discloses a color ring chip inductor with high stability. The shape of the color ring chip inductor is manufactured according to the shape of a standard chip inductor and is marked according to a marking method of the color ring chip inductor; the color ring chip inductor is further provided with a shielding layer; a magnetic core is a molybdenum permalloy magnetic core with high stability and contains 3.2%-3.8% of molybdenum, 15.8%-17.2% of iron and 79%-81% of nickel; an inductance stability numerical value is not higher than 0.03% and an initial inductance deviation range numerical value is not higher than 0.3%; a packaging material is epoxy resin; a winding is an insulating varnished wire; and two metal pins are sheet-shaped and are arranged at the bottom of the color ring chip inductor. The invention further discloses a manufacturing method of the color ring chip inductor, comprising the steps of winding wires, insulating and curing, welding, packaging, marking and the like. The color ring chip inductor disclosed by the invention is stable in induction property, is not sensitive to temperatures, is long in service life and can be used for color ring induction/chip induction.

A current transformer according to the present invention may comprise a magnetic core, a secondary coil, and a magnetic flux compensation member. A main circuit of an air circuit breaker penetrates the magnetic core. In addition, the secondary coil is arranged to be adjacent to the magnetic core, and a secondary current is induced through a current flowing in the main circuit. In addition, the secondary coil supplies the induced secondary current to a relay. The magnetic flux compensation member may be coupled to the magnetic core so as to correct magnetic flux of the secondary coil.

Heat is less likely to transfer from a terminal electrode to a wire. A coil component includes a core, a first terminal electrode provided on a first flange of the core, a winding portion wound around a winding core of the core, and a first wire having a first end. The first end of the first wire is electrically connected to the first terminal electrode. A part of the first end is spaced apart from the first terminal electrode.

The invention discloses a transformer. The transformer comprises a circuit board, two first magnetic core bodies and at least one second magnetic core body, wherein the circuit board has two opposite surfaces; the at least one second magnetic core body is embedded into the circuit board along the thickness direction of the circuit board; the two first magnetic core bodies are respectively fixed on the two opposite surfaces; the at least one second magnetic core body is positioned between two first magnetic core bodies; and the two first magnetic core bodies and the at least one second magnetic core body form a magnetic core of the transformer. The invention also provides a switch power supply.

The disclosure provides a core, comprising a body formed from a winding of tape shaped material, and a package encasing the body. A single gap is formed in the body and the package. A clamp is connected to the package to flex a flexible section of the package to reduce the gap.

The invention discloses a multi-DC equalizing charge system. The equalizing charge work is finished through two charge mechanisms. The invention has the following advantages: in comparison with dissipative equalizing, the problem of heat management is avoided; in comparison with non-dissipative equalizing with capacitive or inductive energy storage, the method has large equalizing current, high efficiency and high speed; and in comparison with transformer equalizing, the method does not need a magnetic core or a coil, avoids magnetic leakage and has a controllable volume.