203results about How to "Small leakage inductance" patented technology

The invention discloses a high-voltage high-frequency transformer with a single-phase high-power special insulation structure. The high-voltage high-frequency transformer comprises a shell, an iron core arranged in the shell, a low-voltage inner coil wound on the iron core column, a high-voltage outer coil wound on the periphery of the low-voltage inner coil, and a lead connected with the leading-out terminal of the high-voltage outer coil, wherein the lead goes out of the shell, an iron core insulation layer is arranged between the low-voltage inner coil and the iron core column, a first encapsulation reserved gap is formed between the low-voltage inner coil and the high-voltage outer coil, and a second encapsulation reserved gap is formed between the high-voltage outer coil and the inner wall of the shell; and epoxy resin insulation layers are filled in the first and second encapsulation reserved gaps. Compared with the prior art of the existing high-frequency transformers (dry-type, air self-cooling type), the high-voltage high-frequency transformer has the advantages that the volume is reduced for more than 30%; 2, the leakage inductance is reduced for more than 80%; 3, the loss is reduced for more than 50%; and 4, the high-voltage high-frequency transformer has good electromagnetic compatibility with other electrical appliances in the cabinet body (the aluminum shell is grounded, and the electric potential is zero).

The transformer is composed of an iron core set, a base, at least a simplex of wire winding, and at least a thin sheet. Conducting wire is wrapped on the simplex. The at least one simplex of wire winding and the at least one thin sheet are sheathed to the base.

The invention provides a high-frequency flat-panel transformer, which aims at solving the technical problems existing in the traditional winding-type transformers in the background technology and the existing flat-panel transformers. The high-frequency flat-panel transformer comprises two E-shaped flat-panel magnetic cores and a multilayer printed circuit board (PCB) winding which is installed on a closed magnetic core which is formed after the two E-shaped flat-panel magnetic cores are fastened. The PCB winding on each layer consists of a copper-clad layer, an insulating dielectric layer and a lead pin. The multilayer PCB winding comprises layers of parallel primary windings and layers of parallel secondary windings, wherein the primary windings and the secondary windings are arranged at intervals. Compared with the traditional winding-type transformers, the high-frequency flat-panel transformer has the advantages that the goal of miniaturizing direct-current to direct-current (DC/DC) power supply modules is achieved and the consistency of power density and parameters is improved; and compared with the existing common flat-panel transformers, the high-frequency flat-panel transformer has the advantages of small size, high power density and small loss.

Disclosed is a high-frequency high-voltage transformer structure. A magnetic core of a transformer comprises two U-shaped magnetic cores (1) in butt joint, primary windings (5) and secondary windings (4) are respectively provided with a two-section structure and are wound on two primary winding frameworks (3) and two secondary winding frameworks (2) respectively, and the secondary winding frameworks (2) are sleeved outside the primary winding frameworks (3) to form a coaxial structure. The two primary winding frameworks and the two secondary winding frameworks are sleeved on magnetic arms in the height direction of the U-shaped magnetic cores (1), the primary windings are connected in series, the secondary windings are connected in series, and magnetic force lines generated by the windings are in the same direction in the magnetic cores by a series connection direction. The primary windings and the magnetic cores (1) of the transformer are insulated by the primary winding frameworks (3), and the secondary windings and the primary windings are insulated by the wall thicknesses of the secondary winding frameworks (2) and gaps among the primary windings (5) and the inner walls of the secondary winding frameworks. By the aid of a set of fixtures (6 and 7), the two magnetic cores in butt joint are clamped, and the transformer is fixed.

The invention discloses a high-frequency transformer used for a spot welding machine, comprising a magnetic core, primary coils and secondary coils; the primary coil and the secondary coil are alternatively wound by layer; an insulation layer is arranged between two adjacent layers; the primary coil is laminated between two primary coil layers; the internal layer and the external layer of the primary coil layer are provided with the secondary coil layers; the secondary coil is wound by thin copper strip layer by layer with one turn for each layer. The structure of the high-frequency transformer is convenient for the winding of the transformer, reduces the volume, weight, inductance leakage and loss of the copper passage, is convenient for educing the secondary heat, and is beneficial for the high-frequency transformer to output larger current and higher power.

The invention discloses an energy balance control device, a battery system and an energy balance control method of the battery system. The device comprises a selection unit, a conversion unit and a transformer, wherein the selection unit is used for gating one path of battery cell needing energy balance control in a battery cell group; the conversion unit is used for realizing a first energy conversion process between the gated battery cell and a storage battery; and the transformer is used for realizing a second energy conversion process between the gated battery cell and the storage battery.According to the scheme, the problem that the number of secondary windings of the transformer needs to be increased along with the increase of battery cells in the battery equalization technology, and consequently the implementation difficulty of the transformer is high can be solved, and the effect that the implementation difficulty of the transformer is reduced due to the fact that the number of the secondary windings of the transformer does not need to be increased along with the increase of the battery cells is achieved.

The invention provides a planar transformer, a power-switching circuit and an adapter. The planar transformer, the power-switching circuit and the adapter can improve the performance of noise suppression. The planar transformer comprises a primary power winding, a secondary power winding and a compound winding layer, wherein the compound winding layer is provided with a first winding and a balancewinding, and the first winding is at least partial winding of the primary power winding or at least partial winding of the secondary power winding.

The invention discloses a planar transformer. The planar transformer comprises an upper magnetic core, a lower magnetic core and multiple flat coils arranged between the upper magnetic core and the lower magnetic core. The adjacent flat coils are insulated. Each flat coil is formed by multiple turns of metal conductors coiled into a spiral shape. The flat coils are vertically projected in space and overlapped vertically. Some flat coils form primary windings of the planar transformer, and the other flat coils form secondary windings of the planar transformer. The planar transformer is characterized in that according to the direction from the center to the outer side of each flat coil, the widths of the turns of each flat coil change as the following form: W1:W2:...:Wn=1:a:...:a(n-1), W represents the widths of the coils, n represents the number of turns of the coils and is larger than or equal to 1, a is larger than or equal to 0.5 and smaller than 1 or a is larger than 1 and smaller than or equal to 1.5, and the widths of the turns of each flat coil change consistently. Magnetic field distribution of the transformer can be changed by changing the widths of the turns of each coil, so that coupling performance and the alternating current loss are changed. The planer transformer has the advantage that leakage inductance and alternating current resistance of the planer transformer can be adjusted according to the actual needs.

The invention discloses a high-frequency power transformer in a primary winding and secondary winding combined structure. The transformer comprises an inner framework, a middle framework and an outer framework, wherein inner primary windings are wound on the inner framework; secondary windings are wound on the middle framework; outer primary windings are wound on the outer framework; the middle framework is inserted into the outer framework; and the inner framework is inserted into the middle framework. The transformer has a simple structure and process, low leakage inductance, high safety and high reliability.

The invention discloses a high-frequency high-saturation-flux-density ferrite, a preparation method, an inductor and a transformer. The ferrite contains main components and auxiliary components in parts by mole: the main components contain 55-57 mol% of Fe2O3, 0-3.5 mol% of ZnO, and the balance MnO; the auxiliary components contain 0.01-0.03 wt% of Nb2O5, 0.02-0.10 wt% of CaCO3, 0.01-0.04 wt% of V2O5, 0-0.01 wt% of SiO2, 0-0.05 wt% of Ta2O5, 0-0.05 wt% of TiO2 and 0.10-0.25 wt% of Co2O3. The ferrite provided by the invention has high saturation magnetic flux density and can be suitable for inductors and transformers. Moreover, the inductor prepared from the high-frequency ultrahigh-saturation magnetic flux density manganese-zinc ferrite material has the advantages of small size and is capable of meeting the requirement for miniaturization of devices.

The invention discloses a high-voltage transmission ratio bidirectional DC converter and a control method thereof. The high-voltage transmission ratio bidirectional DC converter mainly comprises a high-voltage side three-phase full-bridge consisting of six switch tubes, a Y-delta shaped three-phase transformer and a low-voltage side three-phase bridge arm consisting of three filtering inductors and three switch tubes. The invention also provides a control method of the high-voltage transmission ratio bidirectional DC converter. The internal characteristics and the control mode of the Y-delta shaped three-phase transformer are utilized to improve the voltage transformation ratio by one time in comparison with a traditional bidirectional DC converter, so that the turn ratio of the transformer is reduced by one time, and the leakage inductance is greatly reduced, the electromagnetism compatibility of the transformer is improved. The low-voltage side three-phase inductors are parallelly connected in a staggered manner, and the output current ripple is greatly reduced after the three-phase current ripples are stacked, so that the service life of a storage battery can be favorably prolonged, and the size of a filter is favorably reduced. The high voltage side and the low voltage side both adopt the three-phase staggered shunt-wound structure, so that the current stress of the switch tubes is reduced and suitable switch tubes can be conveniently selected for high-power application occasions.

The invention relates to a fixing device of a coil framework of a miniature transformer and a method for winding coils. The fixing device of the coil framework consists of five parts, namely a framework fixing shaft, metal springs, steel balls, a tap fixing shaft, a tap fixing pin group and a connection shaft. A transformer framework is fixed and multi-winding taps are led out and fixed, the winding level of the miniature transformer is improved, and a method which is simple, high in efficiency, high in reliability and wide in application is provided for winding of the transformer. By adoption of the fixing device, the method for winding the coils is also improved. By performing the steps of installing a winding fixing device of the miniature transformer, installing the coil framework, winding the coils and fixing winding taps, the method has the advantages that: the winding efficiency of the miniature transformer is improved; the rate of finished products is improved from about 60 percent to above 95 percent, so that wasting is avoided; a transformer manufacturing process is simple and easy to operate; manufacturing efficiency is at least doubled; and the method is wide in application.

The invention discloses a transformer. A layer of first coil serving as a primary coil, a layer of second coil serving as a secondary coil, a layer of third coil serving as a primary coil, a layer of fourth coil serving as a secondary coil and a layer of fifth coil serving as a primary coil are wound in the axial direction of a framework, and shielding layers are arranged between the first coil and the second coil, between the second coil and the third coil, between the third coil and the fourth coil and between the fourth coil and the fifth coil respectively. According to the transformer, the winding structure of the primary coil, the secondary coil, another primary coil, another secondary coil and another primary coil is adopted, gaps between the primary coils and the secondary coils are greatly reduced, and leakage inductance is greatly reduced. Meanwhile, total magnetic field intensity of the gaps between the primary coils and the secondary coils is lowered, the total energy of a primary winding space magnetic field and the total energy of a secondary space magnetic field are greatly reduced, and leakage inductance is further reduced and is almost 2-4% of primary inductance. Due to the fact that the leakage inductance is reduced, loss of the transformer and voltage loss are greatly reduced.

The invention discloses a planar transformer of a printed circuit board, and relates to the technical field of transformers, and designs a planar transformer of a printed circuit board aiming at an application of a 200W power-level direct current 48V-to-8V full-bridge topology switching power supply. Compared with a traditional wound soft magnetic ferrite transformer, the planar transformer has the significant advantages that the size is small; a planar multi-layer stacked structure is adopted by a primary winding and a secondary winding and coupling between the windings is relatively compact, so that the size of the planar transformer does not exceed 30% of that of the traditional transformer with the same frequency and power level; the loss is small; a copper foil which is 105 microns in thickness is adopted as the winding; the skin effect of a conductor is fully utilized; and the conductive utilization rate of the copper foil is improved, so that the current density of the windings is improved; the planar transformer is low in leakage inductance, high in parameter consistency and good in heat dissipation performance; the planar copper foil winding has high heat dissipation capability; if the planar transformer is integrated into a whole body of a multi-layer printed board of a power supply in a design process of the power supply, a thermal channel of each winding is relatively short; the heat dissipation capability is relatively high; a professional technical worker is not needed; and the cost is reduced.

The invention discloses a communication transformer which comprises a framework and an iron core. A winding groove is formed in the framework, a wound winding set is arranged in the winding groove of the framework, the winding set comprises a plurality of primary windings and a plurality of secondary windings, the primary windings and the secondary windings are arranged at intervals and are twisted to form the winding set, and the winding set is wound on the winding groove of the framework. The invention further discloses a winding method of the winding set of the communication transformer. The winding set is arranged in the winding groove of the framework, the winding set comprises the primary windings and the secondary windings, the primary windings and the secondary windings are arranged at intervals and are twisted to form the winding set, the twisted secondary windings and primary windings are fully and closely combined, the leakage inductance between the primary windings and the secondary windings is small, the leakage flux loss of the transformer is lowered, the phenomenon that the energy of communication signals is severely attenuated after the communication signals pass through the transformer is solved, and the transmission performance of the communication transformer is improved.

This invention discloses a power supply device including an active clamp normal shock converter with self-driving and synchronous commutation and two common-mode filters and a low voltage difference linear converter, in which, the two filters are connected to the input and output ends of the active clamp normal shock converter and the low voltage difference linear converter is connected with the common-mode filters in the following steps: the transformer in the normal shock converter is a HF plane transformer with Faraday shield, RC buffer absorption circuits are parallel between the source and the drain of the main switch tube, primary secondary non-switch nodes are connected by Y bypass capacitor and the length of a low impedance loop where the capacitor places is reduced to reduce its difference-mode noises and common-mode noises.

The invention provides a transformer for heating high-voltage high-current lamp filaments. A secondary side winding of the transformer adopts a complete-covering type design using a copper conductive disc, a conductive rod and a conductive column to form a turn of windings; the inductance leakage is greatly reduced while the upper limit value of the output current is improved; the space between a primary side winding and the secondary side winding is designed by multiple insulating ways that are carried out by adopting transformer oil, a poly-tetra-fluoro shell and an organic glass plate, so that the voltage resistance between the primary side winding and the secondary side winding is effectively improved, and the spacing between the primary side and the secondary side is reduced; the transformer has the advantages of small and compact structure, light weight, high output current, high voltage resistance, low resonance current and the like; and the transformer can stably and effectively provide high current in an electronic beam current generating system and can be used for heating lamp filaments in an electronic gun.

The invention discloses a LTCC-based planar transformer and a manufacturing method thereof. The method comprises the following steps: S1, preparing an upper substrate, a lower substrate and a plurality of middle substrates, which all employ an LTCC (Low Temperature Co-Fired Ceramic) material raw ceramic chip with the first magnetic conductivity; S2, forming a hole in at least one middle substrate;S3, manufacturing primary and secondary electrode patterns on the plurality of middle substrates, and performing the filling of the holes to form a plurality of electrode layers; S4, putting an LTCCmaterial with second magnetic conductivity in areas where the primary electrodes and the secondary electrodes of the plurality of electrode layers are mutually inducted and overlapped to form a plurality of filling electrode layers, wherein the second magnetic conductivity is greater than the first magnetic conductivity; S5, laminating the plurality of filling electrode layers, the upper substrateand the lower substrate, and carrying out glue discharging and sintering to form the LTCC planar transformer, in which the LTCC material with the first magnetic conductivity and the LTCC material with the second magnetic conductivity are co-fired and then tightly combined to form an intermediate magnetic conductivity material with the magnetic conductivity being between the first magnetic conductivity and the second magnetic conductivity. The coupling coefficient of a planar transformer can be effectively improved, and the primary leakage inductance and the secondary leakage inductance of theplanar transformer are reduced.

A high-temperature planar transformer employing a metal coated ceramic substrate comprises a dual-annular closed-structure magnetic core and multiple groups of ceramic substrate planar coils employinga metal coated technology, wherein the dual-annular closed-structure magnetic core is formed by splicing a group of Fe-Ni-Mo metal magnetic powder cores, all planar coil assemblies form a primary winding and a secondary winding of the transformer, an installation hole is reserved in the ceramic substrate employed by the high-temperature planar transformer and is used for placing the metal magnetic powder core material magnetic cores, and two parts of magnetic cores are placed in the installation hole from two sides of the ceramic substrate and then are abutted and pasted to a whole. Comparedwith a traditional winding transformer and a planar transformer, the high-temperature planar transformer employing the metal coated ceramic substrate has the following advantages that the power density of the transformer can be substantially improved by employing the metal coated ceramic substrate, the leakage inductance and the distributed capacitance of the transformer are reduced, the cooling efficiency is improved, moreover, the transformer can work for a long time in a high-temperature environment of 200 DEG C or above, so that the cooling design of the transformer can be simplified, thesize and the weight of the transformer are reduced, and meanwhile, the design requirement of aerospace and oil drilling in high-temperature environment industry on a switch power supply is met.

The invention provides a sectional type high-power high-frequency and high-voltage transformer. The sectional type high-power high-frequency and high-voltage transformer comprises a magnetic core; an insulating framework covers an outer part of the magnetic core; primary windings and secondary windings are wound on the insulating framework in sequence; insulating layers are wound between the primary winding and the secondary winding. The invention further discloses a sectional winding method of the sectional type high-frequency and high-voltage transformer; on the basis of an original layered design of the primary winding and the secondary winding, between-layer voltage of the primary winding and the secondary winding is further reduced, so that a between-layer insulating index of the primary winding and the secondary winding is reduced. Furthermore, the sectional winding method of the high-frequency and high-voltage transformer can effectively reduce equivalent parasitic capacitances of the primary winding and the secondary winding and an equivalent parasitic capacitance between the primary winding and the secondary winding, so that the conduction of EMI (Electro-Magnetic Interference) noises is reduced. Meanwhile, the invention further provides a section number design scheme of the high-frequency and high-voltage transformer; the size of the high-frequency and high-voltage transformer is easy to reduce and leakage inductance of the transformer is easy to reduce.