127 results about "Magnetic integration" patented technology

Voltage regulation, transient response and efficiency of a voltage regulator module (VRM) is improved where short duty cycles are necessitated by large differentials of input and output voltage by including at least one clamping of a tap of an inductance in series with an output of each of a plurality of parallel branches or phases which are switched in a complementary fashion or providing coupling between inductors of respective phases. Such coupling between inductors is achieved in a small module with an integrated magnetic structure. Reduced component counts are achieved while deriving built-in input and output filters. Principals of the invention can be extended to isolation applications and push-pull forward converts, in particular. A lossless clamping circuit is also provided allowing spike currents to be suppressed while returning power to the output of the VRM.

A magnetic part having a first iron core wound with a winding constituting a transformer and an inductance component of a parallel coil and a second iron core wound with an inductance component of a series coil, in which a ratio of the dimensions of the first iron core and the second iron core are in accordance with their respective winding densities.

The invention discloses a magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter, comprising an input partial-voltage capacitor circuit, a half-bridge three-level bridge arm, an isolated transformer, a driving circuit and a rectification and filtering circuit. According to the magnetic integrated self-driving current-double rectification half-bridge three-level direct-current converter, voltage stress of a main switch tube is reduced through a half-bridge three-level topology without a flying capacitor and an embedded diode, and a problem of reliability of the embedded diode of the conventional half-bridge three-level topology is solved at the same time; conduction loss of a vice-side rectification tube is reduced by a synchronous rectification proposal; the conduction loss of a vice side of a transformer is further reduced by a current-double rectification technology, and the efficiency is improved; the structure and the volume of a converter are simplified through a magnetic integration and automatic driving scheme; and the main transformer integrates output filter inductance therein by utilizing a two-transformer primary-side serial-connection vice-side alternating parallel connection structure so that the power density of the converter is improved.

The invention relates to a two-way two-tube forward converter topology, its main circuit composed of power supply, four power diodes, two primary side clamping diodes, two serial capacitances, a main power transformer composed of primary winding and secondary winding with a secondary side composed of a rectifier with two rectifier diodes and an output filter capacitance. It remains the advantages of low primary-side voltage stress of a two-way two-tube forward converter, no direct turn-on of bridge arm, high reliability, etc; compared with general two-way two-tube forward converters, it has only two clamping diodes and simple structure; it adopts magnetic integration technique of transform, further reducing the bulk and enhancing power density of transform. It not only implements zero voltage turn-on and turn-off, but also basically eliminating voltage peak of diodes in the secondary rectifier by the clamping action of filter capacitance, having very high efficiency.

The invention provides an interleaved parallel magnetic-integration bidirectional full-bridge LLC resonant converter and relates to the technical field of power and electronic applications. The interleaved magnetic-integration bidirectional full-bridge LLC resonant converter comprises two paths of an interleaved parallel bidirectional full-bridge LLC resonant converter. The first path of the bidirectional full-bridge LLC resonant converter comprises a first primary-side circuit, a first secondary-side circuit, a resonant transformer and a magnetic inductor thereof. The second path of the bidirectional full-bridge LLC resonant converter comprises a second primary-side circuit, a second secondary-side circuit, a resonant transformer and a magnetic inductor thereof. The primary-side circuit and the secondary-side circuit of each path of the bidirectional full-bridge LLC resonant converter are respectively in the form of a full-bridge LLC resonant circuit and are used for realizing the bidirectional energy flow. The two resonant transformers, the magnetic inductors thereof and four resonant inductors of the two paths of the interleaved parallel bidirectional full-bridge LLC resonant converter are magnetically integrated through integrated magnetic pieces. According to the technical scheme of the invention, the large-power, high-transformation-ratio, small-volume, bidirectional and high-efficiency operation of the electric energy is realized.

The invention discloses a magnetic integration type integrated filter inductance transformer which is characterized in that the transformer adopts two sets of triphase shell-type iron core structures or two sets of single-phase shell-type iron core structures; an alternating current network side winding and a load winding are only wound on a main iron core post, and filtering windings are simultaneously wound on the main iron core post and an auxiliary iron core post; the main iron core structure is the same as the traditional shell-type transformer, and the iron core magnetic circuit is closed; the auxiliary iron core adopts a magnetic circuit structure with an air gap; the number of sets of filtering windings is configured according to the filtering requirement of a system, and each set of windings are externally connected with a corresponding filtering capacitor to jointly constitute a specific subharmonic filtering branch. According to the invention, a filter reactor and the transformer are integrated, and the filtering windings can realize effective harmonic suppression through externally connecting the filter capacitor, thus one-time cost of investment is greatly reduced; and at the same time, the auxiliary iron core structure provides a circulation path for leakage magnetic flux between the primary and secondary windings, restricts the circulation direction of the leakage magnetic flux, and is beneficial to reducing the stray loss of the transformer, thus improving the operating efficiency of the transformer.

The invention relates to an integrated magnetics based interleaved flyback micropower grid-connected inverter in a two-stage structure. The front stage is an interleaved flyback transform circuit adopting integrated magnetics, wherein interleaved flyback discrete transformers are integrated on one magnetic chip by means of magnetic integration technique. The rear stage is a low-frequency full-bridge inverter circuit, grid-connected current is controlled at the front stage, and power frequency inversion and grid connection are realized by the rear-stage circuit. The integrated magnetics based interleaved flyback micropower grid-connected inverter has the advantages of high power density, high efficiency, low grid-connected current distortion rate, easiness in development, low cost and the like, and is especially suitable for micropower grid-connected inverters.

A magnetic integration double-ended converter with an integrated function of a transformer and an inductor includes an integrated magnetic member having a magnetic core with three magnetic columns having at least three windings (N_P, N_S1, N_S2) and at least one energy storage air gap, where a primary winding (N_P) and a first secondary winding (N_S1) are both wound around a first magnetic column or are both wound around a second magnetic column and a third magnetic column, and a second secondary winding (N_S2) is wound around the second magnetic column; an inverter circuit with double ends symmetrically working, acting on the primary winding (N_P); and a group of synchronous rectifiers (SR₁, SR₂), gate electrode driving signals of which and gate electrode driving signals of a group of power switch diodes (S₁, S₂) of the inverter circuit with the double ends symmetrically working complement each other.

The invention discloses an isolated bidirectional resonance soft switching DC-DC converter. A topological structure of the isolated bidirectional resonance soft switching DC-DC converter comprises twoactive bridges and a resonant cavity, the converter is simple in topological structure and is convenient to realize magnetic integration, thereby having the potential of realizing the high power density. Meanwhile, the converter can realize the wide-range flexible adjustment of the bidirectional voltage gain by means of a simple frequency conversion control mode, so that the reliability is enhanced. In addition, the converter can realize the zero-voltage switching-on (ZVS) of an inverter switching tube and the zero-current switching-off (ZCS) of a rectifier switching tube in a very wide range, so that the switching loss is greatly reduced. The converter can be applied to various occasions needing bidirectional power flow, such as an energy storage system, a storage battery charging and discharging controller in an electric automobile, a switching power supply, etc.

The invention discloses an efficiency optimization control method for a bidirectional converter in a microgrid energy storage system, which combines traditional light-load phase switching control, multi-degree of freedom frequency modulation control and a phase-shifting magnetic technology. The energy storage system adopts a six-phase interleaved parallel bidirectional converter main circuit. The efficiency optimization control method comprises the steps of firstly building a load current loss model, and deducing load current corresponding to an optimal phase switching point; secondly, seeking the optimal operating frequency under phase switching control by adopting multi-degree of freedom frequency control; and finally, suppressing ripple deterioration under the light load, the switched phase and the low frequency by adopting a phase shifting technology and a magnetic integration design to achieve a control target of higher efficiency operation under light load conditions. Compared with a bidirectional converter in the microgrid energy storage system in the prior art, the efficiency optimization control method can effectively improve low light-load efficiency of the bidirectional converter in the microgrid energy storage system and solve a problem of ripple deterioration easily caused by traditional phase switching control, greatly expands a high-efficiency operation range of the bidirectional converter and improves the stability and reliability of the system.

The present invention discloses a multi-winding magnetic integrated type hybrid power distribution transformer, which comprises an auxiliary iron core, a current transformer set and a three-phase winding. The iron core comprises an iron yoke, an upper iron core column and a lower iron core column, wherein the iron yoke, the upper iron core column and the lower iron core column are connected to form the iron core. Each current transformer set is composed of a current-controlled converter and a voltage-controlled converter. The three-phase winding is composed of a main transformer winding, a series transformer winding and a filtering inductor. Each phase of the main transformer winding comprises a primary winding, a secondary winding and a plurality of control windings. Each phase of the series transformer winding comprises a grid-side winding and a plurality of converter-side windings. Each current-controlled converter is accessed to the corresponding control winding. Based on the magnetic potential balance principle, the grid current is controlled. Each voltage-controlled converter is accessed to the corresponding converter-side winding so as to control the load voltage. Based on the magnetic integration technique, the integrated design of all discrete magnetic parts of a multi-winding transformer is realized, so that the utilization rate of the ferromagnetic material and the controlling capacity of equipment can be improved. A plurality of current transformer groups are matched up in the coordinative manner and are standby for one another. Therefore, the reliability of the equipment is effectively improved.

The embodiment of the invention discloses a magnetic integration transfer circuit system which is applied to the technical field of power supply. The magnetic integration transfer circuit system comprises a main source voltage acquiring unit and at least one auxiliary source voltage acquiring unit, wherein the main source voltage acquiring unit comprises an integrated magnetic piece with at leastthree cylinders, a primary winding, at least two main secondary windings and a main source voltage stabilizing output circuit; the auxiliary source voltage acquiring unit comprises an auxiliary secondary winding and an auxiliary source voltage output circuit, two ends of the primary winding are connected with an input power supply, the at least two main secondary windings are respectively wound on at least two of the cylinders in the integrated magnetic piece and are connected with the main source voltage stabilizing output circuit; and the auxiliary secondary winding is wound on the cylinderwith an energy storing gap in the integrated magnetic piece and is connected with the auxiliary source voltage output circuit. The invention reduces the space volume of the auxiliary circuit of the power supply, thereby simplifying the high-power power supply.

The invention relates to an interleaved magnetic integration type coupling inductor, consisting of an E-Chinese character 'Wang'-I-shaped core body and a coil, wherein the E-Chinese character 'Wang'-I-shaped core body consists of a Chinese character 'Wang'-shaped core, an E-shaped core and an I-shaped core; the E-shaped core and the I-shaped core are arranged at the both sides of the Chinese character 'Wang'-shaped core in the middle of the core body; two-phase coils are respectively wound on two middle posts of the Chinese character 'Wang'-shaped core; three magnetic path air gaps are arranged at contact positions of one sides of three transverse yokes of the Chinese character 'Wang'-shaped core and three transverse yokes of the E-shaped core; and other three magnetic path air gaps are arranged at contact positions of the other sides of the three transverse yokes of the Chinese character 'Wang'-shaped core and the I-shaped core. The interleaved magnetic integration type coupling inductor provided by the invention has the beneficial effects in that the coupling inductor is used for inductive coupling integration; the quantity of the air gaps is increased for one time; the length of the air gaps is reduced for a half; the diffusion flux of the air gaps can be obviously reduced; energy and materials can be saved; and the electromagnetic interference is reduced.

The invention discloses an EMI filter module based on magnetic integration, which comprises a magnetic core, a common-mode inductance layer, a common-mode integrated inductance-capacitance structure, a leakage inductance layer and a differential-mode capacitor. The differential-mode capacitor is a laminated capacitor, and the common-mode inductance layer consists of a single-layer plane spiral coil. Since the laminated capacitor is used as the differential-mode capacitor, the invention reduces the requirements for the dielectric material in the differential-mode capacitor, and the dielectric material with good temperature, high frequency sensitivity but low dielectric constant can be used, thereby solving the problems of high temperature and high frequency due to the use of the material with the high dielectric constant in the prior art, and improving the performance stability of the EMI filter module; and since the single-layer spiral coil is used as the common-mode inductance layer, the invention reduces the size of the EMI filter module.

The present invention provides a three-port converter with magnetic integration and current ripple cancellation. With magnetic integration technology, the number of magnetic rings is reduced, and the number of driving coupling transformers is also reduced, thereby greatly reducing the size and weight of the whole converter; and with a current ripple cancellation branch, the amount of current ripples flowing through the three ports is very low and close to zero. The three-port converter of the present invention reduces the influence of electromagnetic interference and simultaneously saves the filter cost so that the busbar current and battery current are smoother.

The invention discloses a hybrid distribution transformer decoupling magnetic integration device. The hybrid distribution transformer decoupling magnetic integration device comprises a pair of iron cores and three sets of windings wound on the pair of iron cores, wherein the iron cores are composed of iron yokes, branched magnetic iron cores and iron core limbs which correspond to the three sets of windings respectively; the three sets of windings comprise main transformer windings concentrically wound on the middle iron core limb, isolation transformer windings concentrically wound on the upper iron core limb and the lower iron core limb after being split, and series converter output filter inductors and parallel converter output filter inductors which are concentrically wound on the upper iron core limb, the lower iron core limb and the middle iron core limb. Separated magnetic pieces in a hybrid distribution transformer scheme are integrated on a pair of symmetric iron cores through an integrated design, so that the quantity of the separated magnetic pieces adopted in the hybrid distribution transformer is sufficiently decreased. In virtue of the symmetry of the iron core structures, the electromagnetic coupling among the windings is eliminated by adopting a method including winding splitting, magnetic flux reverse offsetting and provision of the branched magnetic iron cores, rich control functionality of an original hybrid distribution transformer is guaranteed, and the device has important practical values for realizing the integrated design of the hybrid distribution transformer.

The invention discloses a transformer and an inductance magnetic integration structure, and belongs to the technical field of power electronics. The transformer inductance magnetic integration structure is composed of a pair of magnetic cores including at least four magnetic columns, a primary winding and a secondary winding. One transformer and two inductors can be integrated in one magnetic core, flexible configuration of the winding structure can also be realized, any transformer turn ratio, any excitation inductance and leakage inductance ratio can be realized and the magnetic core loss can also be reduced and the efficiency can be improved. Meanwhile, the integrated structure greatly reduces the volume and the weight of power magnetic parts so as to be helpful to improve the power density of the converter. The structure is particularly suitable for various applications such as bidirectional CLLC resonant converters and the like where transformers and inductors are used for high-frequency, high-efficiency and high-power density power conversion.

The invention is a magnetic integrated DC/DC conversion boost transmission ratio extension circuit and a high boost transmission ratio circuit, and as realizing the stage extension of a boost-type transmission ratio extension two-port network from stage n to n+1, the inductance and diode regularly increase by degrees, i.e. adding an inductance and three diodes can realize the extension from the stage n to n+1; the DC/DC conversion boost transmission ratio extension circuit with extended stage number n (2<=n<=500) is applied to a traditional boost converter, which composes a like-polarity high boost transmission ratio circuit, where the transmission ratio M=n/(1-D); and as the DC/DC conversion boost transmission ratio extension circuit with extended stage number n (2<=n<=500) is applied to a traditional buck-boost converter, which composes a reversed-polarity high boost transmission ratio circuit, where the transmission ratio M=-(nD)/ (1-D); it can realize the magnetic integration of many inductances in a boost transmission ratio extension circuit by adopting magnetic integrated multi-winding coupled inductance.

The invention belongs to the technical fields of electronic ceramic materials and preparation thereof, and particularly relates to a ferrite material NiCuZn with large magnetic field-resistant property and low-temperature sintering property and a preparation method thereof. An expression formula of a molecule structure of the ferrite material NiCuZn is Ni0.27Zn0.5Cu0.18Co0.05Fe1.95O4. On the basisof the formula of the ferrite material NiCuZn, the pre-firing materials of 1wt% of Bi2O3 (bismuth trioxide) and 2.5 to 3.5wt% of Zn2SiO4 (zinc silicate) are combined and doped. The studied material can be sintered at low temperature of 900 DEG C, and the initial magnetic conductivity mu i is 65.3 to 70.4; the large magnetic field-resistant property H70% is 1140 to 965A/m, the quality factor at the frequency range of 6MHz to 18MHz exceeds 100, the highest quality factor exceeds 130, and the comprehensive magnetic property is very excellent. The ferrite material NiCuZn has the advantages that the comprehensive requirements of higher initial magnetic conductivity, large magnetic field-resistant property and high quality factor of the ferrite material with low-temperature sintering property are well met, the cost of the production raw materials is low, the technology is simple, the operation is convenient, and the cost is low; the ferrite material NiCuZn can be widely applied into laminated sheet type power inductors, magnetic beads, transformers and other magnetic integration modules.

The invention discloses a charging station system for new-energy automobiles. The charging station system comprises direct-current bus, a plurality of charging piles, a first man-machine operation module, a second man-machine operation module, a data collecting module, a video collecting module, a central processor, a predicting and analyzing module and an expert evaluation module, wherein the input end of the direct-current bus is connected with a power supply system, and the charging piles are hung to the direct-current bus; at least two carbon-based capacitor battery packs which work in a synchronous and same-phase manner, a coupling magnetic integration inductor, at least one power supply voltage isolation rectifying device and at least one power switch conversion component are arranged in each charging pile. The charging station system has the advantages that charging pile conditions can be monitored and analyzed in real time, the balance of output currents among parallel power supplies is guaranteed, current sharing is achieved, the service life of the charging piles is prolonged, power system stability is achieved, the harmonic currents of the charging piles are reduced, the carbon-based capacitor battery packs are coordinated with wind-driven and solar power generating system, and the market requirements of energy conservation and emission reduction are satisfied.

The invention provides a permanent-magnet DC fan cluster system topological structure, which comprises a plurality of permanent-magnet DC fan parallel branches, wherein each permanent-magnet DC fan parallel branch comprises a plurality of permanent magnet DC fan assemblies connected in parallel. The plurality of permanent-magnet DC fan parallel branches are connected in parallel to form a close-loop structure. Each permanent magnet DC fan assembly outputs a high-voltage direct current. The close-loop structure is provided with a high-voltage DC convergence point. For the defects of complex DC fan series-parallel control and difficult fault processing, magnetic-integration high-frequency transformers and high-frequency high-voltage rectifiers are utilized to solve the problems of high-voltage direct current generated by each DC fan, the multi-fan cluster system topological structure and fault tolerance, thereby preventing the problem of extra electrical insulation due to series connection of the DC fans, and overcoming the problem of fan power distribution and complex voltage stability control due to different wind speeds or fault.