410 results about "Leakage inductance" patented technology

The invention provides a high-frequency circulating current calculation method for a motor simulator cascade coupling parallel structure, and the method comprises the following steps: building an equivalent decoupling circuit model of each branch in the cascade coupling parallel structure based on the voltage relation of each branch in the motor simulator cascade coupling parallel structure, wherein the equivalent decoupling circuit of each branch comprises an equivalent voltage source and an equivalent leakage inductor which are connected in series, and the equivalent leakage inductor is determined based on self-inductance and mutual inductance of a choking coil of each branch; a plurality of duty ratio intervals are divided between 0 and 1, and the number of the duty ratio intervals is equal to the number of the branches in the cascade coupling parallel structure; and using the equivalent decoupling circuit model to calculate the high-frequency circulation of each corresponding branch when the duty ratio of the modulation signal of the motor simulator is in each duty ratio interval. According to the method provided by the invention, the high-frequency circulating current of the cascade coupling parallel structure of the motor simulator can be accurately calculated, and effective support is provided for targeted design of a high-frequency circulating current suppression scheme.

The disclosure provides a method for improving the efficiency of a micro-inverter, and a dual-active-bridge-type micro-inverter. The method including: performing power modulation mode switching of a dual-active-bridge-type micro-inverter, such that the power is bi-directionally transmitted from a direct-current side to an alternating-current side and from the alternating-current side to the direct-current side, thereby reducing an effective value of a secondary side current of a transformer; and according to the modulation mode switching characteristic of the dual-active-bridge-type micro-inverter within a power frequency period, performing hybrid optimization on the turn ratio of a primary side to a secondary side and a transformer leakage inductance of a high-frequency transformer of the dual-active-bridge-type micro-inverter.

A two-transistor flyback topology in which a portion of leakage inductance energy in the transformer is extracted and used to obtain zero voltage switching on both switching elements in any operating conditions, and in which a third low power switch eliminates parasitic oscillations and allows an operation at a determined frequency. In this topology, there are no switching losses and there are no spikes or glitches in any switching node, eliminating the need for snubbers. This topology is an “ideal two transistor flyback topology.”

The present invention relates to the technical field of transformer fault detection. Disclosed is a transformer early fault diagnosis method based on the difference between virtual and actual winding leakage magnetic field waveforms, comprising: collecting leakage magnetic field information of a non-ideal winding structure transformer by means of fiber-optic magnetic field sensors; decomposing a winding of the non-ideal winding structure transformer into a plurality of regular windings; superposing leakage magnetic fields at the ends of a plurality of regular windings to obtain a non-ideal winding end leakage magnetic field; calculating a leakage flux matrix leakage inductance parameter and a leakage magnetic field output matrix parameter on the basis of the non-ideal winding end leakage magnetic field; establishing a circuit-leakage magnetic field multi-state digital model corresponding to the transformer; and using the difference between an actual transformer leakage magnetic field waveform and a digital transformer model virtual leakage magnetic field waveform as a fault characteristic quantity, completing threshold calculation and early fault sensitivity verification, forming a waveform difference-based early fault diagnosis criterion, and determining a fault position. The present invention can achieve quick and sensitive diagnosis of early faults of transformer windings and improves device operating reliability.

The invention discloses an efficient new energy transformer and an electric energy control system, and relates to the technical field of transformers, an input power conversion module is used for converting a direct current or alternating current variable voltage source into high-frequency alternating current for output, and a high-frequency isolation transformer module adopts a nanocrystalline-amorphous alloy mixed magnetic core. The windings are arranged in a three-layer staggered mode and provided with an oil dual-cooling system, and the output rectification inversion module is used for converting high-frequency alternating current into needed direct current or alternating current to be output and integrates the multi-phase synchronous rectification function and the active filtering function. By designing the nanocrystalline-amorphous alloy mixed magnetic core and the three-layer staggered winding, leakage inductance is reduced, the coupling coefficient is increased, the problems of leakage inductance and nonuniform magnetic flux caused by serious iron loss, large leakage inductance and unreasonable coil arrangement of a traditional single-material low-frequency iron core at medium and high frequencies are solved, hysteresis and eddy-current loss are effectively inhibited, and the service life of the low-frequency iron core is prolonged. The leakage inductance is minimized, the high-frequency transformation efficiency is improved, and the size and the weight are reduced.

The present application relates to the technical field of power devices, and particularly discloses a resonant leakage inductance transformer for a plate-type ozone generator, comprising: insulating bobbins, two insulating bobbins being longitudinally provided, a primary coil structure and a secondary coil structure being respectively provided on the insulating bobbins in the circumferential direction, and the two insulating bobbins being longitudinally aligned and fixed; magnetic cores, each magnetic core comprising a plurality of protruding portions, the protruding portions extending in the longitudinal direction, the plurality of protruding portions being arranged in a single transverse row, and the protruding portions located in the middle in the arrangement direction respectively longitudinally passing through the middle of the two insulating bobbins; and an insulating fixing frame, the magnetic cores being arranged in the insulating fixing frame. The primary coil structure and the secondary coil structure are each of a multi-layer wound coil structure, and ceramic tubes are inserted between adjacent layers of coils of the coil structure.

The invention relates to the technical field of inductors, in particular to a common-mode and differential-mode integrated annular inductor assembly which comprises an annular magnetic core, a first winding and a second winding, and the common-mode and differential-mode integrated annular inductor assembly is reversely wound on the annular magnetic core in a double-wire parallel winding mode to form a common-mode path. The starting end of the first winding is a first input pin, the terminating end of the first winding is a first output pin, the starting end of the second winding is a second input pin, the terminating end of the second winding is a second output pin, and the first output pin and the second output pin are connected with a load through a circuit topology and are automatically connected in series to form a differential mode path. Through magnetic core partition and annular distributed air gap design, collaborative optimization of common-mode magnetic field offset and differential-mode anti-saturation is completed, and the technical effects of high-frequency common-mode suppression and broadband differential-mode suppression are achieved; through a gradient leakage inductance winding technology, dynamic adaptation of a differential mode inductance value is completed, and the flexible filtering requirement of adapting to different noise spectrums is met.

The invention belongs to the technical field of nuclear power, and particularly relates to a ground capacitance measurement method based on series capacitance and high-frequency signal injection. In order to solve the problem that a traditional signal injection method cannot accurately calculate the ground capacitance level of a power distribution network, the invention provides a ground capacitance measurement method based on a series capacitor and high-frequency signal injection. The leakage inductance of the voltage transformer is accurately measured by injecting the high-frequency signal, so that a resonance point is convenient to find during frequency sweeping, and the resonance point measured during frequency sweeping is more accurate.

The application provides a high-frequency circulating current calculation method for a motor simulator cascaded coupling parallel structure, comprising the following steps: establishing an equivalent decoupling circuit model of each branch in the cascaded coupling parallel structure based on the voltage relationship of each branch in the motor simulator cascaded coupling parallel structure, wherein the equivalent decoupling circuit of each branch comprises an equivalent voltage source and an equivalent leakage inductance connected in series, and the equivalent leakage inductance is determined based on the self-inductance and mutual inductance of each branch choke; dividing a plurality of duty cycle intervals between 0 and 1, and the number of duty cycle intervals is equal to the number of branches in the cascaded coupling parallel structure; and using the equivalent decoupling circuit model to calculate the high-frequency circulating current of each branch when the duty cycle of the modulation signal of the motor simulator is in each duty cycle interval. The method provided by the application can accurately calculate the high-frequency circulating current of the motor simulator cascaded coupling parallel structure, and provides effective support for the targeted design of a high-frequency circulating current suppression scheme.

A micro inverter having a plurality of independent inputs and a photovoltaic system are provided. The micro inverter includes multiple isolated DC-DC converters and a DC-AC converter. Each isolated DC-DC converter of the isolated DC-DC converters includes an inverter H-bridge, a transformer and a voltage-multiplying rectifier. An input terminal of the inverter H-bridges is configured to connect to a direct-current power supply. A secondary winding of the transformer is connected to an input terminal of the voltage-multiplying rectifier. An output terminal of the voltage-multiplying rectifier is connected to an input terminal of the DC-AC converter. A leakage inductor or an external inductor of the transformer forms series resonance along with a capacitor in the voltage-multiplying rectifier.

The invention provides a current stress optimization method and system for an isolated bidirectional three-phase energy storage converter, and relates to the technical field of power conversion. Firstly, Fourier series analysis is carried out on primary and secondary side voltages of a high-frequency transformer, and leakage inductance current and active power are calculated accordingly; carrying out per-unit processing on the active power and the square of the primary side current, and obtaining the active power and the square of the peak current under the fundamental component based on a per-unit processing result; then, with the minimum square of the peak current as an optimization target and the transmission power under the fundamental component as a constraint, constructing and solving a current stress optimization model so as to obtain an optimal matrix converter parameter; and finally, performing current stress optimization control based on the optimal parameters to reduce the current stress. According to the method, the current stress is remarkably reduced while the set transmission power requirement is met, the direct current side dynamic response is improved, and the converter performance is improved.

The invention discloses an absorption circuit for a multi-path parallel flyback switching power supply MOS (Metal Oxide Semiconductor) tube, which is used for controlling voltage between a drain electrode and a source electrode of the MOS tube and comprises a first flyback circuit, a second flyback circuit and an absorption circuit, and the first flyback circuit and the second flyback circuit are connected in parallel and are connected to an output end of the absorption circuit; and the high-frequency capacitors C101 and C103 respectively form a loop with the primary side leakage inductance Lm of the transformer in the first flyback circuit and the second flyback circuit, so that the voltage amplitude generated by resonance of the leakage inductance Lm and the parasitic capacitance Coss of the MOS tube is reduced. Meanwhile, fast recovery diodes D102 and D104 are conducted, so that a high-frequency capacitor C102 absorbs voltage energy, a transient voltage suppression diode D101 performs voltage clamping, and terminal voltage of an MOS tube in the flyback circuit is controlled. The circuit is verified by an actual multi-path parallel flyback switching power supply, the work is stable and reliable, the stress control effect of the MOS tube is good, and the cost is relatively low.

A method for operating a switching power converter to reduce ripple current magnitude includes (a) controlling duty cycle of a plurality power stages of the switching power converter to regulate at least one parameter of the switching power converter, each power stage including a respective power transformer, and (b) controlling an injection stage of the switching power converter to reduce voltage across leakage inductance of each power transformer, the injection stage including an injection transformer that is electrically coupled to a respective secondary winding of each power transformer.

An integrated transformer with a bypass magnetic core and a three-port on-board charger. The integrated transformer comprises a base (10), and a first C-shaped magnetic core (5) and a second C-shaped magnetic core (6) which are mounted on the base (10). Two ends of the first C-shaped magnetic core (5) and two ends of the second C-shaped magnetic core (6) are butt-jointed in pairs to form a closed magnetic ring. A first winding (W1), a third winding (W3) and a fourth winding (W4) are wound on the first C-shaped magnetic core (5), and a second winding (W2) is wound on the second C-shaped magnetic core (6). The integrated transformer further comprises a bypass magnetic core (3) which is arranged in the middle of the magnetic ring to divide the magnetic ring into a first chamber (4) and a second chamber (5). The integrated transformer reuses a bypass magnetic core and controls the coupling between transformer windings to obtain leakage inductance as resonance inductance, and by integrating four power magnetic elements in the prior art into one transformer for application in an on-board charger, the number of magnetic devices of the converter can be reduced, so that the power density of the converter can be greatly improved, the overall loss of the converter is reduced, the efficiency is improved, and the cost of the magnetic devices of the converter is lowered.

The invention belongs to the technical field of fault-tolerant motors, and particularly discloses a permanent magnet fault-tolerant motor which comprises a stator, a rotor and a choke ring, the stator comprises a plurality of stator teeth and stator windings which are evenly distributed in the circumferential direction, the stator teeth are of a discrete structure, the included angle between every two adjacent stator teeth is 360 degrees / X, X is the number of single-phase stator teeth, and X is the number of single-phase stator teeth. The stator windings are embedded into grooves of the stator teeth in an axial distribution mode; the rotor is located on the inner side of the stator and comprises a rotor iron core and magnetic steel, the magnetic steel is a surface-mounted permanent magnet, the two magnetic steel with opposite polarities form a pair of magnetic poles, and the two magnetic steel in each pair of magnetic poles are arranged in the axial direction and are aligned with stator teeth; the choke rings are axially distributed between adjacent stator teeth, each choke ring is of a rectangular ring structure, and a single choke ring forms a fault-tolerant unit. When the permanent magnet fault-tolerant motor is in turn-to-turn or single-phase short circuit, the current suppression ring generates high-impedance leakage inductance without time delay, the short-circuit current is suppressed, the fault tolerance of the motor is improved, fault detection is not needed, and the reliability is high.

The invention discloses a small-size high-power power supply design method and application based on a planar transformer, and the method comprises the following steps: S1, employing a planar transformer structure comprising at least two layers of PCB windings and a low-loss ferrite magnetic core, enabling the windings to be formed through the etching of PCB copper foils, and enabling the leakage inductance of the adjacent winding layers to be reduced in a staggered stacking manner; s2, the planar transformer is integrated into an LLC resonant half-bridge topology circuit, and soft switching operation of a power supply system under high frequency is achieved by adjusting the primary and secondary turn ratio and resonance parameters of the planar transformer. PCB copper foil etching windings and low-loss ferrite magnetic cores are adopted, leakage inductance is reduced by stacking winding layers in a staggered mode, and the reliability of the power supply system is improved; the planar transformer is combined with laser cutting to precisely control an air gap, so that primary and secondary coupling coefficients are improved to a high coupling state, energy loss is reduced, the size of the transformer is effectively reduced, the planar transformer can be popularized to the fields of industrial power supplies, energy storage systems and the like, and balance of small size and high power is achieved through collaborative optimization of the planar transformer and a topological structure.

Disclosed in the present invention are an integrated transformer capable of utilizing leakage inductance, and a three-port on-board charger. The integrated transformer comprises a first C-shaped magnetic core and a second C-shaped magnetic core, wherein two ends of the first C-shaped magnetic core are respectively butt-jointed to two ends of the second C-shaped magnetic core to form a closed magnetic ring, a first winding and a third winding are wound round the first C-shaped magnetic core, and a second winding is wound round the second C-shaped magnetic core. The integrated transformer further comprises a bypass magnetic core, wherein the bypass magnetic core is arranged in the middle of the magnetic ring, and divides the interior of the magnetic ring into a first cavity and a second cavity. The present invention reuses a bypass magnetic core, and controls the coupling between transformer windings to obtain leakage inductance as resonant inductance; and four power magnetic elements in the prior art are integrated into a transformer, and the transformer is then applied to an on-board charger. Thus, the number of magnetic devices of a converter is reduced, and thus the costs are reduced; the power density of the converter is significantly improved; the overall loss of the converter is reduced, and the efficiency is improved; and the costs of the magnetic devices of the converter are reduced.

The application discloses a bidirectional DCDC circuit and a photovoltaic energy storage inverter. The photovoltaic energy storage inverter is used for connecting a photovoltaic module, a battery and an alternating current end. The bidirectional DCDC circuit comprises a first direct current end, a second direct current end, a transformer, a first full-bridge circuit connected between the first direct current end and a primary side of the transformer, a second full-bridge circuit connected between a secondary side of the transformer and the second direct current end and a first capacitor. The first full-bridge circuit is directly connected with the primary side of the transformer and / or the second full-bridge circuit is directly connected with the secondary side of the transformer. The first capacitor is located between the second full-bridge circuit and the second direct current end and is connected with positive and negative poles of the second direct current end. The bidirectional DCDC circuit provided in the application uses leakage inductance of the primary side of the transformer and the first capacitor to form an LC resonant circuit instead of an LC resonant circuit arranged at two ends of the transformer, so that the function of the resonant circuit is realized while the number and volume of electrical elements of a topological structure are reduced, thereby reducing the cost.

The application relates to the technical field of switching power supply, and discloses a bridge type low-stress passive soft switching boost power factor correction circuit, which comprises a direct current input power supply, a main power switching tube, an output filter capacitor and a coupling inductor comprising a primary side and a secondary side; a passive soft switching buffer network is connected to a main circuit of the circuit, the network comprises a diode full-bridge structure and a buffer capacitor, and the leakage inductance of the secondary side of the coupling inductor is connected between the midpoints of two bridge arms of the full-bridge structure; the application utilizes the ratio difference of the coupling inductor to generate a forward potential difference, drives the buffer capacitor to reversely charge to establish a negative voltage, and further provides a discharge circuit for the parasitic junction capacitance of the main power switching tube, so that zero voltage turn-on is realized, and high-frequency switching loss is reduced; meanwhile, the highest voltage stress of the semiconductor device is clamped in the range of the direct current output voltage through the potential restriction of the full-bridge network. The application does not need auxiliary active devices, and improves conversion efficiency and reliability while simplifying the system structure.

The invention relates to a transformer leakage inductance calculation method and device and computer equipment. The method comprises the following steps: acquiring magnetic induction intensity and vector magnetic potential of any point in an iron core window; obtaining magnetic field energy in an iron core window area based on the magnetic induction intensity and geometric parameters of the iron core window; based on the vector magnetic potential and the cross section size of the winding area, obtaining interaction energy of the current and the vector magnetic potential in the winding area; on the basis of the interaction energy and the magnetic field energy, magnetic leakage energy stored by a unit length winding is obtained; the leakage inductance of the transformer is obtained based on the total leakage flux energy of the winding and the winding current of the low-frequency equivalent circuit, and the total leakage flux energy is obtained through calculation based on the leakage flux energy stored by the winding per unit length and the winding length.

The invention belongs to the technical field of transformers, and discloses an expandable phase modular transformer, a method and a DC-DC converter, and the transformer is characterized in that one end of a low-voltage bridge module is connected with a primary-side high-voltage bridge, and the other side of the low-voltage bridge module is connected with a secondary-side high-voltage bridge; the low-voltage bridge module comprises n parallel modules which are connected in parallel; each parallel module comprises two input ends and two output ends; one end of one input end of each parallel module is connected with the first end of the primary side high-voltage bridge, and the other input end of each parallel module is connected with the low-voltage bridge; a plurality of parallel switch tubes are arranged in the low-voltage bridge; the other end of the low-voltage bridge is connected with the first end of the first inductor Lk; a low-voltage bridge capacitor C9 is connected in parallel in each low-voltage bridge; the second end of the first inductor Lk is connected with the first end of the second inductor Lm and the first end of the primary side of the transformer. The embedded full bridge is adopted, so that the transformer effectively counteracts leakage inductance reactance, and optimal operation at any frequency is ensured.

The invention discloses a transformer capable of suppressing common-mode interference and a booster circuit, and belongs to the technical field of power electronic converters, the transformer comprises a magnetic core, a primary winding and a secondary winding, the primary winding and the secondary winding are formed by winding multiple layers of coaxial cables, shielding conductors of the primary winding and the secondary winding are configured to have the same number of winding turns and winding direction, the structure of the transformer is applied to a staggered winding mode and is connected to a static potential point, so that the potential distribution between the transformer and the static potential point is consistent, the voltage difference on a distributed capacitor is close to zero, common-mode conducted interference is fundamentally inhibited, the transformer structure is also applicable to the staggered winding mode, and the process can be simplified while the leakage inductance is reduced. The booster circuit using the transformer realizes efficient and low-interference multipath isolation output.

The utility model discloses a flyback switching power supply control circuit, which comprises a PFC (Power Factor Correction) circuit, the primary side alternating current filtering and rectifying circuit is connected in series with the PFC circuit; a secondary side filtering and rectifying circuit; the common mode inductor TF1 is connected to the secondary side filtering and rectifying circuit; the circuit further comprises at least two transformers and RCD absorption circuits connected with the transformers respectively, the input ends of the transformers and the RCD absorption circuits are connected with the PFC circuit, the RCD absorption circuits are connected in series, and the output ends of the transformers are connected to the secondary side filtering and rectifying circuit. According to the high-power flyback circuit, heating of a single transformer can be greatly reduced, heat treatment is easier, the problems that a high-power flyback circuit transformer is high in leakage inductance and the voltage stress of an MOS tube is not easy to solve are solved, meanwhile, the manufacturing cost of a 200-600W switching power supply can be reduced, and the circuit structure is simpler and more convenient.

The utility model discloses a drive circuit with fast rise time, which relates to the field of repetition frequency high-voltage pulse power supplies, and comprises a control signal unit used for transmitting a signal to a primary side of an isolation transformer, and the isolation transformer carries out electricity-magnetism-electricity conversion on a control signal and outputs the control signal to a drive unit; the beneficial effects of the utility model are that the energy storage capacitors C3 and C4 are arranged, so that an energy release path is shortened, and a faster opening signal rising edge can be generated; the triode Q1 is arranged to delay conduction, so that the leakage inductance limitation of the isolation transformer can be relieved, and the conduction or turn-off speed of the switch is improved; a resistance adjusting method is adopted, and the resistance value of R2 in the driving circuit is changed, so that the dead zone time is controllably adjusted; when the discharge switch tube Sdi is switched off, even if interference pulses exist, the MOS tube M2 can firmly clamp the grid electrode of the discharge switch tube Sdi at-10V, and the anti-electromagnetic interference performance of the drive circuit is improved.

The invention discloses an integrated adjustable leakage inductance matrix transformer and a resonant converter, and relates to the technical field of power electronics, the matrix transformer comprises an upper cover plate, a middle cover plate, a lower cover plate, a plurality of magnetic columns, a primary winding and a secondary winding; the magnetic columns are arranged between the upper-layer cover plate and the lower-layer cover plate, and each magnetic column is provided with an air gap; the middle-layer cover plate is arranged between the upper-layer cover plate and the lower-layer cover plate and penetrates through the air gaps; the primary winding is wound on the magnetic column close to one side of the upper-layer cover plate, and the secondary winding is wound on the magnetic column close to one side of the lower-layer cover plate; after electrification, a magnetic field generated by primary side current excitation forms a main magnetic flux loop through the upper-layer cover plate, the magnetic column, the lower-layer cover plate, the magnetic column and the upper-layer cover plate, and forms a leakage magnetic flux loop through the upper-layer cover plate, the magnetic column, the middle-layer cover plate, the magnetic column and the upper-layer cover plate; the size of the leakage inductance of the leakage magnetic flux loop is adjusted by adjusting the structural parameters and design conditions of the middle-layer cover plate. According to the invention, accurate control of the leakage inductance of the transformer and integration of the resonant inductor and the transformer are realized.

The invention relates to the technical field of power control, in particular to a filter and leakage inductance collaborative design method of a single-stage bidirectional high-frequency isolation inverter, which comprises the following steps: acquiring basic design parameters, constructing an inverter modulation model according to a modulation strategy, and solving the model to obtain a modulation signal expression; deriving a zero-current switching current constraint condition and a zero-voltage switching current constraint condition of the switching tube based on a modulation strategy; combining the constraint condition with an inverter modulation model, and solving to obtain a soft switching constraint condition; according to the soft switching constraint condition and the value range of the modulation signal expression, determining a collaborative value range of the filter inverter side inductance and the transformer leakage inductance meeting the soft switching requirement; and selecting design parameters of inverter side inductance and transformer leakage inductance of the filter, and determining other circuit parameters of the filter according to a reactive power demand and a grid-connected harmonic standard. According to the invention, the problems of soft switching failure, loss increase and electromagnetic interference caused by parameter mismatching can be effectively suppressed.

The invention provides a leakage inductance integrated magnetic device and an assembling method thereof.The leakage inductance integrated magnetic device is provided with a plurality of transformers and a base, the transformers are connected in parallel, the base comprises a plurality of positioning clamping grooves, the transformers are assembled in the positioning clamping grooves respectively, each transformer comprises a plurality of integrated structures, and the integrated structures are connected in series; each integrated structure comprises a PQ type magnetic core structure, a framework, a primary winding and a secondary winding, each PQ type magnetic core structure comprises a first U-shaped magnetic core half body and a second U-shaped magnetic core half body, the first U-shaped magnetic core half body and the second U-shaped magnetic core half body are symmetrically closed, the framework is embedded into a central column body of the first U-shaped magnetic core half body, the primary winding is embedded into the framework in a coil mode, and the secondary winding is embedded into the central column body of the second U-shaped magnetic core half body. And the secondary winding is embedded into the central cylinder of the second U-shaped magnetic core half body in the form of a wire cake, so that the high-power output requirement of the leakage inductance integrated magnetic device is met, the electrical performance and the structural layout of the leakage inductance integrated magnetic device are optimized, and the space and the preparation cost of the whole machine are saved.

In accordance with one embodiment, a driver is configured to adjust a phase offset of driver control signals between corresponding switches of the same phase of the primary converter and the secondary converter consistent with the target power transfer and the estimated electromagnetic circuit inductance (e.g., comprising a leakage inductance), to minimize thermal energy dissipated from the direct-current-to-direct current converter or its transformer for the sampling time interval.