46 results about "Leakage inductance" patented technology

This utility model discloses a drive-shielded transformer and voltage converter, belonging to the field of transformer technology. The drive-shielded transformer includes a frame, a primary winding, a secondary winding, and a magnetic core. The primary and secondary windings are sequentially wound around the frame, and a shielding layer is provided between the primary and secondary windings. The magnetic core is located at both ends of the frame. The leads of the primary winding, secondary winding, and shielding layer are connected to the pins of the frame, and the shielding layer is grounded through the pins. This drive-shielded transformer uses copper foil shielding and grounding to shield the parasitic capacitance, leakage inductance, and interference generated by the primary and secondary windings, and releases them through the grounding leads. This significantly reduces the leakage inductance and parasitic capacitance of the transformer, giving the transformer the best electromagnetic compatibility effect during operation, isolating noise and spurious waves within the operating frequency, resulting in higher power conversion efficiency and lower temperature rise during continuous operation. This transformer features small size, wide operating frequency range, and good structural assembly.

Modified control scheme for a single-stage voltage converter for voltage conversion between a single-phase AC network and a DC network. This scheme involves splitting each pulse into multiple sub-pulses when using pulse-width modulated control of a full-bridge circuit. This reduces the RMS current in the leakage inductance of the voltage converter's transformer.

The application relates to a method for designing leakage inductance and suppressing transformer impulse current by using the leakage inductance, characterized in that the method comprises the following steps: obtaining a four-dimensional feasible region of a transformer capacity arc set S and a transformer leakage inductance set by four-dimensional visualization processing respectively L lp ; obtaining a fitted B-H curve according to actual test data of a core, and converting the B-H curve into a I curve; physically modeling a no-load transformer considering the leakage inductance, and establishing a mathematical model, and solving the mathematical model to obtain a magnetic flux expression considering the leakage inductance; combining the magnetic flux expression considering the leakage inductance and the I curve, and calculating the impulse current considering the leakage inductance i , and calculating the current of multiple periods to obtain a waveform of the impulse current. The application designs the leakage inductance by using a four-dimensional visualization method, and quantitatively calculates the impulse current considering the influence of the leakage inductance on the basis of traditional qualitative analysis of the impulse current, so that the impulse current at the power-on moment of the transformer is reduced.

The application discloses a combined photovoltaic energy storage system, and belongs to the technical field of solar power generation and energy storage. The system comprises a photovoltaic input module, a high-frequency isolation power conversion module, an energy storage battery module, a grid-connected inverter output module and a control module. The high-frequency isolation power conversion module internally comprises a three-winding high-frequency transformer, realizing magnetic coupling power transmission and electrical isolation between three ports of photovoltaic input, energy storage battery and grid-connected output. The three-winding transformer has preset leakage inductance between each winding, and forms LC filter circuits with corresponding capacitors, filtering high-frequency ripples and suppressing harmonics. The control module monitors the state of each module in real time and dynamically adjusts the switching frequency and phase shift angle. The application fundamentally solves the power coupling interference and fault propagation problem in the traditional DC coupling scheme through the three-port high-frequency isolation topology, and has the advantages of high integration, high efficiency and good safety.

The application relates to a transformer for a flyback switching power supply and the flyback switching power supply, two of the first primary winding, the second primary winding and the third primary winding of the transformer are connected in parallel and connected with the other in series to form a primary winding unit, the primary winding unit is connected between the static point pin and the dynamic point pin of the transformer, and a Y-shaped winding method or an inverted Y-shaped winding method with the dynamic point pin as a reference point can be formed; when the inverted Y-shaped winding method is adopted, the magnetic field generated by the primary winding is distributed in an axial symmetry in the winding window, the leakage inductance can be obviously reduced, and the power supply efficiency can be improved; the Y-shaped winding method or the inverted Y-shaped winding method can distribute more turns in the primary winding which is not connected in parallel, the number of the windings connected in parallel is reduced, and the parasitic capacitance of the secondary winding can be reduced.

An impedance matching apparatus for providing impedance matching for an RF component. The apparatus includes a balun transformer circuit having a primary coil at an input side of the balun transformer circuit. The primary coil can be connected to a signal source to receive an input signal from the signal source. The balun transformer circuit further includes a secondary coil at an output side of the balun transformer circuit, the secondary coil being coupled to the primary coil to supply an output signal to the RF component and having a parasitic leakage inductance configured to match the output impedance of the signal source to the input impedance of the RF component

The application provides a PCB transformer, a design method, a DC / DC converter and a power module, wherein the design method comprises the following steps: determining the single-turn winding width based on the window size of a magnetic core; determining the branch winding width based on the transformer center frequency and the winding material parameters, and determining the single-turn branch number based on the single-turn winding width and the branch winding width; determining the number of single-turn branch windings of the primary side and the secondary side based on the transformer type and the single-turn branch number to determine the transverse stagger mode, and determining the longitudinal stagger mode based on the turn difference of the primary side and the secondary side; designing the branch windings of the primary side and the secondary side in parallel based on the number of single-turn branch windings of the primary side and the secondary side, and stagger designing each single-turn winding of the primary side and the secondary side based on the transverse and longitudinal stagger modes to obtain a PCB winding plate. The application solves the problems of the existing single-turn copper PCB transformer, such as being greatly affected by the skin effect and the proximity effect, and having large parasitic capacitance and leakage inductance of the primary side and the secondary side.

The utility model discloses a transformer with small leakage inductance, and the primary winding comprises a first wire cake, a second wire cake, a third wire cake, a fourth wire cake and a fifth wire cake, the second wire cake, the third wire cake, the fourth wire cake and the fifth wire cake are all 2-layer wire cakes with 15 turns of three-layer insulation wire, the secondary winding comprises a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil and the third secondary coil are both flat coils, the first wire cake and the second secondary coil are both wire cakes with three-layer insulation wire, the first wire cake, the second wire cake, the first secondary coil, the third wire cake, the second secondary coil, the fourth wire cake, the third secondary coil and the fifth wire cake are sequentially stacked from top to bottom, the second wire cake is connected with the fourth wire cake, the third wire cake is connected with the fifth wire cake, the second wire cake is connected with the third wire cake, and the fourth wire cake is connected with the fifth wire cake, so that the leakage inductance is greatly reduced, and the performance of the transformer is improved.

A high-frequency transformer based on state perception and active control includes: a magnetic core assembly comprising two E-type magnetic cores placed opposite each other; a frame assembly comprising a primary frame fitted in the middle of the central magnetic column of the two E-type magnetic cores; two secondary frames evenly and symmetrically distributed on both sides of the primary frame; a leakage adjustment frame disposed at the interval between the primary frame and one of the secondary frames; a winding assembly comprising a primary winding wound on the primary frame; two secondary windings wound on the two secondary frames respectively; a DC winding wound on the leakage adjustment frame; and an adjustable DC power supply output terminal electrically connected to the DC winding; a state perception module comprising a leakage flux sensing sensor for real-time sensing of leakage flux in the magnetic circuit of the high-frequency transformer; and an active control module comprising a leakage inductance closed-loop control submodule for acquiring leakage flux in the magnetic circuit of the high-frequency transformer, converting the leakage flux into a power supply adjustment signal, sending it to the adjustable DC power supply, and adjusting the adjustable DC power supply.

The application discloses a parallel structure of power load capacitance, and solves the problem of fixed load capacitance mode in the prior art, which is inconvenient to disassemble and assemble. The application comprises a capacitance module, wherein the capacitance module is provided with an input end and an output end; the capacitance module comprises at least two groups of series-connected busbars, the busbars are provided with a plurality of evenly-distributed capacitance supports, and the capacitance supports are provided with a plurality of evenly-distributed and parallel-connected capacitors. The application has the advantages of simple and reliable structure, convenience in disassembly and assembly, small leakage inductance, parallel connection of multiple capacitors through the parallel structure of power resonance capacitance power capacitors, balanced alternating current and voltage among the capacitors, and reduction of induced inductance caused by the parallel capacitors.

This invention provides a method and system for testing high-frequency transformer winding coils, relating to the field of high-frequency transformer technology. The method includes the following steps: generating a standard calibration signal matching the target test frequency range, connecting it to an unloaded test link, a short-circuit test link, and a standard impedance load link respectively; collecting noise signal characteristics of each link; and establishing a noise database and calibration coefficient table. Through sensing units deployed around the winding coil, the method non-contactly collects electromagnetic field change data during coil operation in real time. This invention addresses interference problems caused by cable parasitic inductance, environmental electromagnetic noise, and instrument noise in high-frequency scenarios through pre-calibration and adaptive anti-interference compensation mechanisms. By establishing a noise database, it achieves accurate noise matching. Combined with adaptive filtering algorithms and dynamic adjustment of the excitation signal, it significantly improves the testing accuracy of sensitive parameters such as leakage inductance and distributed capacitance, ensuring test reliability.

This invention relates to the field of power electronic converter technology, and discloses an asymmetric magnetic integrated transformer with multi-rail concurrent output and its design method. The structure includes a three-dimensional cross-shaped shared magnetic core and asymmetric spatially distributed windings. The design method of the magnetic integrated transformer includes: S1: designing the winding spatial layout based on the characteristics of multiple voltage rails with the same power; S2: extracting the full-order inductance matrix based on the unit current excitation condition; S3: deriving the analytical expression of the multi-port equivalent leakage inductance; S4: matching the multi-rail concurrent LLC resonant topology parameters. This invention improves the magnetic flux distribution under multi-port concurrent operation, suppresses local magnetic flux density concentration, and improves the space utilization and power density of magnetic components.

The application discloses a multi-winding transformer, which comprises a framework and a magnetic core body fixed on the framework, and a first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4 and a shielding layer winding N5 are sequentially and layer by layer wound on the framework; when the second primary winding N4 is wound, the second primary winding N4 is wound on the take-up end of the first primary winding N1, and the start end and the take-up end of the first primary winding N1 and the start end of the second primary winding N4 are all sleeved with an insulating sleeve for providing insulation protection. The primary winding is wound in a layered manner, and the secondary winding is wrapped, so that the magnetic resistance between the primary winding and the secondary winding is reduced through the structure of being tightly wrapped, the coupling interference caused by the distributed capacitance and the leakage inductance is reduced, the coupling coefficient between the primary winding and the secondary winding is improved, and the electromagnetic compatibility of the transformer is improved.

The application discloses a power electronic distribution network transformer propagation model optimal adaptation method and system, and the method comprises the following steps: calculating transformer winding leakage inductance and winding resistance, and transformer excitation inductance and excitation resistance; estimating the equivalent value of each link distributed capacitance; deducing the propagation coefficient of the high-frequency transformer model and the low-frequency transformer model at any frequency under the excitation source; calculating the relative deviation amount of the corresponding propagation coefficient of the high-frequency transformer model and the low-frequency transformer model at different frequencies in the required frequency band of the simulation scene; obtaining the maximum value of the relative deviation amount of the propagation coefficient under all conditions in the required frequency band of the simulation scene; when all the maximum values of the relative deviation amount of the propagation coefficient are less than the set relative deviation limit value, the low-frequency transformer model is selected for the simulation scene, otherwise the high-frequency transformer model is selected; the application has the advantages that the optimal selection of the transformer model is performed under the consideration of the simulation efficiency and accuracy requirements.

This application provides a reactive power dispatching method, apparatus, device, and storage medium for an energy storage system, relating to the field of energy storage control technology. The specific technical solution is as follows: In response to an active power command, based on the state parameters of multiple energy storage units, the active power of the energy storage converter corresponding to each of the multiple energy storage units is determined; secondly, based on the total active power, a first compensation reactive power is determined to compensate for the reactive power loss of the leakage inductance of the primary winding of a multi-winding transformer; then, based on the active power of each energy storage converter, a second compensation reactive power is determined to compensate for the reactive power loss of the leakage inductance of the secondary winding connected to each energy storage converter; finally, based on the first compensation reactive power and the second compensation reactive power corresponding to each energy storage converter, a reactive power dispatching command is issued to each energy storage converter. This application can effectively reduce the interference of active power dispatching on the reactive power of the multi-winding transformer side and improve the operational stability of the energy storage system.

This invention discloses an online identification method and system for dual inductor parameters of a doubly-fed induction generator (DFIG) MRAS position observer, belonging to the field of sensorless control for doubly-fed variable-speed pumped storage. The method includes: a stator leakage inductance coefficient identification step and a mutual inductance coefficient identification step. The stator leakage inductance coefficient identification step includes: performing coordinate transformation on the position observed by the observer, the α' component and β' component of the rotor current to obtain the identified q-axis component of the rotor current; constructing a stator leakage inductance coefficient identification formula for identifying the stator leakage inductance coefficient to obtain the stator leakage inductance coefficient identified at the current moment; the mutual inductance coefficient identification step includes: using the stator leakage inductance coefficient identified at the current moment to perform online mutual inductance coefficient identification to obtain the mutual inductance coefficient identified at the current moment. This invention pertains to online identification of mutual inductance and stator leakage inductance coefficients under sensorless control conditions, which can improve the accuracy of the MRAS position observer and ensure the power control performance of the doubly-fed variable-speed pumped storage unit.

This utility model relates to the field of transformer technology. The novel three-slot plastic frame has coils and magnetic cores mounted on it. The coils are wound around the frame, and the magnetic cores are secured inside the frame. The frame is integrally formed, with a connecting post in the middle and connecting plates at both ends. Two partitions on the connecting post divide the frame into three winding slots. The partitions are 5-6mm thick. Outwardly protruding support blocks are provided on the outer sides of the connecting plates, connecting to the transformer's base plate. Notches are provided on one side of each partition. By setting two partitions on the connecting post, dividing the frame into three winding slots, the primary and secondary coils are wound on the slots respectively, ensuring stable leakage inductance performance of the transformer. The support blocks on the outer sides of the connecting plates serve to fix the pins and provide support. Furthermore, using this three-slot plastic frame can meet the requirements of a 7uH transformer without the need for a resonant inductor, saving material costs and reducing the transformer's size.

The utility model discloses a waterproof type magnetic control induction switch belongs to magnetic control induction switch field. A waterproof type magnetic control induction switch of the utility model, including magnetic control induction switch casing, the magnetic control induction switch casing one end is equipped with the connecting wire, the magnetic control induction switch casing is provided with rubber base around connecting wire, still include outside baffle, outside baffle set up on rubber base, install first waterproof pipe sleeve on rubber base, the second waterproof pipe sleeve is sleeved to the connecting wire outer surface, the clamping groove is set up between outside baffle and first waterproof pipe sleeve, the second waterproof pipe sleeve diameter with clamping groove diameter corresponds. The utility model has solved the leakage sensor and the buzzer alarm that the existing magnetic control induction switch is equipped with in order to respond to the water leakage condition, but the magnetic control induction switch volume is small in order to be able to adapt to various devices, and the problem of undoubtedly increasing the size of magnetic control induction switch of this kind of leakage -proof structure is added.

The application relates to the technical field of power electronic conversion, in particular to a multifunctional integrated transformer applied to a new energy automobile, a vehicle-mounted power supply system and a power conversion method. An integrated transformer comprises a magnetic core assembly, a primary winding assembly and a secondary winding assembly, the primary winding assembly and the secondary winding assembly are electromagnetically coupled and are integrated in the magnetic core assembly; the primary winding assembly comprises at least two primary winding units which are electrically connected in series; the secondary winding assembly comprises a first secondary winding unit for outputting a first voltage and a second secondary winding unit for outputting a second voltage; wherein the transformer is configured to provide resonant inductance by using leakage inductance of the primary winding assembly, and the magnetic flux directions of the at least two primary winding units generated in the common magnetic path part of the magnetic core assembly are opposite to form magnetic flux cancellation. Through deep integration of circuit topology and magnetic path function, the application realizes deep fusion and miniaturization of OBC and DCDC.

The invention relates to the technical field of rectifiers, and provides an active clamping three-phase high-frequency link matrix rectifier and a pulse width modulation method thereof.The active clamping three-phase high-frequency link matrix rectifier comprises a three-phase alternating-current power supply, an LC input filter, a matrix converter, a high-frequency transformer, an uncontrolled rectifier bridge, an output filter and a load which are connected in sequence; an active clamping circuit is connected in parallel between the uncontrolled rectifier bridge and the output filter; each of the upper and lower bridge arms of each phase of the matrix converter comprises two switching tubes which are reversely connected in series. Based on the topology, the resonance process characteristics of the parasitic capacitance of the secondary side diode and the leakage inductance of the transformer are combined, and the high voltage stress generated by the leakage inductance of the transformer and the oscillation of the parasitic capacitance of the secondary side diode is suppressed by driving the auxiliary switch Saux on the premise of ensuring the output quality.

The application relates to a motor torque control method and device, computer equipment and a storage medium. The method comprises the following steps: collecting motor state quantities, and obtaining a stator current, a motor estimated torque and an air gap flux according to the motor state quantities; obtaining a first corresponding relationship between the stator current and a stator leakage inductance, a second corresponding relationship between the motor estimated torque and a rotor leakage inductance, and a third corresponding relationship between the air gap flux and a motor excitation mutual inductance, respectively; obtaining the stator leakage inductance according to the first corresponding relationship, obtaining the rotor leakage inductance according to the second corresponding relationship, and obtaining the motor excitation mutual inductance according to the third corresponding relationship; and obtaining a motor available torque according to the stator leakage inductance, the rotor leakage inductance and the motor excitation mutual inductance. The method can solve the problem that the torque capacity of an induction motor is difficult to fully exert.

The application discloses a laminated high-frequency micro transformer and relates to the technical field of transformers. The laminated high-frequency micro transformer comprises a transformer body, the transformer body comprises a lower magnetic core, the top end of the lower magnetic core is provided with an upper magnetic core, the inner sides of the upper magnetic core and the lower magnetic core are both provided with a framework, the outer surface of the framework is provided with a substrate, the surfaces of the substrate and the framework are both provided with pins, the inner surfaces and the outer surfaces of the upper magnetic core and the lower magnetic core are both provided with self-heat-dissipation mechanisms and quick-assembly mechanisms, and the outer surface of the pin is provided with a leakage inductance adjusting mechanism. Through the self-heat-dissipation mechanisms, the leakage inductance adjusting mechanism and the quick-assembly mechanism, the self-adjusting function of the heat dissipation fin is realized at a lower cost, the substrate spacing adjusting function is more efficient, and the assembling function is more stable.

The application discloses an online collaborative optimization method and system based on reflux power and soft switch constraint, mainly solves the problems of reflux power increase caused by transient power and equivalent voltage fluctuation in the existing power frequency cycle and hard switching caused by crossing the soft switch boundary when refluxing. The scheme comprises the following steps: sampling the real-time state variables running in the dual active bridge micro-inverter circuit; calculating the internal and external phase displacement and the objective function based on the sampled photovoltaic side voltage, photovoltaic side current, leakage inductance current, bridge arm equivalent voltage and grid side voltage; outputting the soft switch judgment signal of the bridge arm commutation current at the commutation event k moment according to the judgment signal; based on the judgment signal, the optimization variables are iteratively updated online to obtain the optimal optimization variables; based on the optimal optimization variables, the corrected internal and external phase displacement are calculated, and the driving signal of the switching tube is outputted to realize the online collaborative optimization of the reflux power and the soft switch constraint of the dual active bridge micro-inverter. The application can reduce the reflux under all working conditions and meet the soft switch, and can be used for reflux power suppression of the dual active bridge converter.

This invention discloses a three-phase integrated busbar intelligent monitoring circuit, monitoring unit, and fault ride-through method, belonging to the field of low-voltage power distribution system monitoring technology. The monitoring circuit includes an energy harvesting module, a sampling module, and a processing module. The energy harvesting module includes an energy harvesting transformer, a rectifier bridge, a filter circuit, and a series-connected resonant capacitor. The resonant capacitor and the core leakage inductance form a resonant circuit to optimize energy harvesting efficiency. Three energy harvesting transformers are respectively set for the three-phase busbar, and each output terminal is connected in parallel to a common filter capacitor after passing through a rectifier bridge. The heat dissipation structure uses a common heat-conducting substrate to achieve three-phase thermal balance. In the fault ride-through method, when some phases fail, the remaining normal phases continue to supply power. The processing module shuts off the faulty phase switching elements and adjusts the operating mode. The sampling transformer continuously collects the current characteristics of the faulty phase. After the fault is recovered, the switching elements are restarted. This invention achieves rapid start-up, efficient energy harvesting, fault ride-through, and full data traceability.

This invention provides an ultra-wideband Doherty power amplifier system and control method, comprising a control layer, a physical layer, and an optimization layer. The physical layer employs three parallel gallium nitride high electron mobility transistors, combined with a broadband collaborative synthesis network of a multilayer PCB planar transformer synthesizer with a leakage inductance resonant parasitic absorption mechanism, to achieve bandwidth expansion. The optimization layer introduces an improved MOEA / D algorithm with group delay flatness constraints. The control layer uses an FPGA-embedded model to assist in iterative learning and control of the ILC unit. This invention effectively solves the nonlinear divergence problem caused by strong physical-control coupling in a three-channel amplifier module architecture within the ultra-wideband range, simultaneously achieving high back-off efficiency and fast, stable convergence of the digital predistortion algorithm in the 0.6–4.9 GHz frequency band.

The utility model discloses a kind of planar transformer and electronic equipment, it is related to planar transformer technical field.The planar transformer includes magnetic block, two magnetic cores and two PCB boards, magnetic core includes horizontal strip, middle column and two edge columns, middle column and two edge columns are all arranged in the surface of horizontal strip, and two edge columns are one-to-one corresponding and arranged on the opposite sides of middle column, PCB board is provided with mounting hole, the middle column of two magnetic cores is one-to-one corresponding and arranged in the mounting hole of two PCB boards, two magnetic cores cooperate with each other, and two PCB boards are spaced apart, magnetic block is detachably installed between two PCB boards.When the leakage inductance of the planar transformer needs to be adjusted, different size magnetic blocks are replaced, and the magnetic blocks are detachably installed between the two PCB boards, the magnetic effect inside the planar transformer is changed, so that the leakage inductance of the planar transformer can be adjusted.

The application discloses an LLC transformer and a manufacturing method thereof, and the LLC transformer comprises a primary winding and a secondary winding, a magnetic core and a skeleton, characterized in that the magnetic core and the skeleton are assembled together, the secondary winding is a planar winding and is embedded in the skeleton, the primary winding is a vertical winding and is wound on the skeleton, and only a predetermined number of layers of the primary winding and the secondary winding are coupled with each other to increase the leakage inductance of the LLC transformer. The LLC transformer can realize the effect of small volume and large leakage inductance, and the manufacturing method of the LLC transformer can conveniently and accurately debug the inductance value of the product to be prepared.

The present invention relates to a DC-DC converter. The DC-DC converter includes a transformer; an input circuit configured to receive an input DC voltage (Ueg) and to provide an input AC voltage (Uew) to the transformer; and an output circuit configured to receive an output AC voltage (Uaw) from the transformer and to provide an output DC voltage (Uag), wherein a leakage inductance estimating device is provided which is configured to determine, to receive, or both to determine and to receive operating parameters (P-De, P-T, P-Ie1, P-Ie2, P-Ueg, P-Da, P-Uag) of the input circuit and the output circuit and, on the basis of the operating parameters (P-De, P-T, P-Ie1, P-Ie2, P-Ueg, P-Da, P-Uag), to determine a leakage inductance parameter (P-L) that estimates a leakage inductance of the transformer.

This invention discloses a boost discharge circuit for an outdoor electric flame stove, comprising: a control circuit, a battery, a primary side first bridge arm, a primary side second bridge arm, a boost transformer, a secondary side third bridge arm, a secondary side fourth bridge arm, and a high-voltage output terminal. Interlocking protection and dead-time insertion for each bridge arm form a coordinated control. The insertion of dead time ensures a safe interval between the primary and secondary side switching times. During the dead time, leakage inductance energy can be safely discharged through resonance and coordinated control. Complementary drive enables the MOSFETs to operate in the soft-switching / low-loss range, reducing switching losses, heat generation, and improving efficiency. Furthermore, during the dead time, forced locking of the diagonal switches of the secondary bridge arm to turn off and the other diagonal switches to turn on further ensures that the voltage gain of the boost circuit monotonically decreases with increasing frequency in the 20kHz–200kHz high-frequency range, achieving a smooth gain curve without abrupt changes, stable high-voltage output, and continuous and reliable arc.