307results about "Transformers/inductances circuits" patented technology

A solid-state transformer is provided. The solid-state transformer includes a first stage, a first DC bus and a second stage. The first stage is configured to receive an AC power and convert the AC power into a first DC power. The first DC bus is electrically connected to the first DC power. The second stage is electrically connected to the first stage through the first DC bus, and is configured to perform isolated step-down DC / DC conversion on the first DC power to generate a second DC power. The first stage is configured to operate at a modulation index higher than 1, and the modulation index is defined by a ratio of twice AC voltage provided by the AC power to voltage across the first DC bus.

The invention discloses a loss tuning method of a power transformer, which is applied to a transformer body sleeved with a winding and comprises the following steps: applying scanning current excitation containing fundamental waves and harmonic waves to the winding, synchronously acquiring a body vibration signal and converting the body vibration signal into a frequency spectrum; extracting a formant from the frequency spectrum, matching the formant with a theoretical electromagnetic force wave and a structure inherent frequency library, and identifying a coupling formant to be optimized; aiming at each formant, installing a vibration exciter in a corresponding area, sending out an anti-phase periodic pulse force, and dynamically and finely adjusting a pulse force parameter by monitoring a vibration response in real time and taking equivalent mechanical impedance minimization as a target; when the optimal damping state is achieved, the vibration exciter output rod is locked, and static pre-tightening force is formed; and after all formants are adjusted and optimized in sequence and the prestress is locked, final pressing and fixing of the transformer body are completed in the state that the pretightening force is kept. According to the invention, the dynamic loss source of the individual transformer can be actively inhibited and cured before assembly and curing, the operation loss and noise are effectively reduced, and the structural stability is improved.

The invention discloses an anti-direct-current component nanocrystalline current transformer and a using method thereof. The anti-direct-current component nanocrystalline current transformer comprises a current transformer body, and a magnetic core hole penetrating front and back is formed in the middle of the front side of the current transformer body. The device is provided with a secondary side open circuit detection and protection mechanism, so that imbalance of a magnetic field in the mutual inductor caused by disconnection of a secondary loop is effectively prevented, iron core magnetic flux saturation and potential high electromotive force generation are avoided, the safety of the mutual inductor and peripheral equipment is protected, the risk of power system faults such as fire disasters or short circuits is reduced, and meanwhile, the safety of the mutual inductor is improved. A live wire centering fixing mechanism is arranged, so that the stable centering position of a wire in a magnetic core hole of the mutual inductor is ensured, magnetic field distribution is optimized, the magnetic leakage phenomenon is reduced, the accuracy and stability of current measurement are remarkably improved, meanwhile, measurement fluctuation caused by wire shaking is reduced, and the measurement precision is improved. And more accurate data support is provided for harmonic analysis, fault detection and electric energy quality monitoring of a power system.

The invention discloses a Rogowski coil current transformer and a current measurement system, and relates to the technical field of current measurement. The Rogowski coil current transformer comprises a Rogowski coil and a signal processing circuit; the differential signal is converted into a differential constant-current signal to be output based on a signal processing circuit; the signal processing circuit comprises an integral amplification module for performing integral amplification on the differential signal based on the integral amplification module; the first direct current component removing module is used for removing a direct current component in the voltage signal after integral amplification based on the first direct current component removing module; the signal adjusting module is used for realizing amplitude in-phase amplification and phase compensation; the single-ended to differential output module is used for generating symmetrical differential voltage signals based on the single-ended to differential output module; and the conversion module is used for converting the symmetrical differential voltage signal into a differential constant current signal and outputting the differential constant current signal based on the conversion module. And through the integral amplification module and the phase compensation module, the differential signal is accurately converted into the current signal, so that the current measurement result is more accurate.

The invention discloses a parallel discharge circuit and an electric flame stove. The parallel discharge circuit comprises a transformer and at least two groups of discharge branches, and the two groups of discharge branches comprise a first discharge branch and a second discharge branch. The scheme that a single transformer replaces multiple transformers is adopted, multi-time conversion loss of electric energy-magnetic energy-electric energy is reduced, electromagnetic interference is reduced, meanwhile, a stove body does not need to be provided with a large number of transformers, the size is more compact, and the parallel connection requirement of hundreds of discharging devices of the high-power electric flame stove is met; according to the invention, continuous control of asynchronous breakdown and independent charging and discharging of multiple discharging branches is realized, the method is adaptive to the breakdown threshold value difference of discharging devices among the discharging branches and the charging speed deviation of voltage-multiplying capacitors, extra voltage-sharing control is not needed, and it is ensured that all the discharging branches can stably complete charging and discharging closed loop, discharging failure is avoided, and mutual interference is avoided; the wide-voltage input circuit is suitable for various voltage inputs, and wide-voltage input is achieved.

An efficiently compensated Inductive Wireless Power Transfer (IWPT) system, comprising an LCT having a primary side and a secondary side; an inverter that converts the input DC power to AC power at a predetermined operating frequency, the output of the inverter is being connected to the self-inductance of the primary side of the LCT via a compensation network consisting of a combination of capacitors and at least one inductor and residing solely at the primary side; a rectifier for converting AC power, induced at the secondary side of the LCT, to DC power, the input of the rectifier is being connected to the self-inductance of the secondary side of the LCT; a load being connected to the output of the rectifier; a DC power supply for feeding DC power to the input of the inverter and generating an induced power that is fed to the load.

The invention relates to a current transformer with an open circuit protection function and a protection method thereof, and belongs to the technical field of transformers, the current transformer comprises a transformer body and a protection box arranged at the front end of the transformer body, and the protection box comprises an indication mechanism used for indicating an open circuit fault of the transformer body; the box body is fixedly connected with the mutual inductor body, and a wire outlet groove is formed in the box body and used for secondary wiring; the binding posts are arranged in the box body and are connected with the secondary coil of the mutual inductor body; the protection mechanism is arranged on one side of the binding post; and the alarm mechanism is connected with the protection mechanism and is used for sending open-circuit fault alarm information. According to the device, the binding posts are short-circuited quickly through the protection mechanism, abnormal operation of the transformer caused by open circuit is prevented, continuous operation of a system is ensured, and the reliability and stability of the current transformer are improved.

This application proposes a magnetic coupling coil optimization method. The method comprises: calculating an equivalent magnetic permeability of a magnetic coupling coil based on an air gap length of the magnetic coupling coil; calculating an effective cross-sectional area of the magnetic coupling coil based on the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating a number of turns of the secondary winding of the magnetic coupling coil based on the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil based on the number of turns of the secondary winding. The present application can reasonably configure the parameters of the magnetic coupling coil, effectively acquire energy from the power grid to provide stable power for detection or communication equipment in the power grid, and make the magnetic coupling coil more reliable while meeting the power demand.

The invention provides a primary resonance elimination device of a power distribution network voltage transformer and a management and control method, and relates to the technical field of voltage transformer resonance elimination. The primary resonance elimination device comprises a primary resonance elimination resistor, a primary resonance elimination power electronic device, a standby resonance elimination resistor and a standby resonance elimination power electronic device; the primary resonance elimination resistor and the primary resonance elimination power electronic device are connected in series and then are connected in series between a neutral point of the power distribution network voltage transformer and a ground wire; the standby resonance elimination resistor and the standby resonance elimination power electronic device are connected in series, one end of the standby resonance elimination resistor and the standby resonance elimination power electronic device which are connected in series is connected with a neutral point of the power distribution network voltage transformer, and the other end is grounded; the primary resonance elimination device further comprises a current transformer and a temperature sensor; the temperature sensor is used for monitoring the temperature values of the primary resonance elimination resistor and the standby resonance elimination resistor; the current transformer is assembled on a line where the primary resonance elimination resistor and the standby resonance elimination resistor are grounded together and used for monitoring the value of current flowing through the primary resonance elimination device.

The invention belongs to the technical field of low-voltage power distribution, and particularly relates to a control method and system for low inductive reactance and low transient impulse voltage, the magnetic flux density and the change rate of a magnetic core are collected in real time through a sensor, a dynamic threshold value is calculated based on the magnetic flux density, and the critical point of the magnetic core entering a nonlinear magnetization area is accurately identified. And comparing the magnetic flux density monitored in real time with a dynamic threshold value, generating a deviation signal and judging the state of the magnetic core. Once it is confirmed that the magnetic core is in a non-linear magnetization state, an adjustment mechanism is triggered immediately, winding current distribution is adjusted to change the magnetic flux path length of the magnetic core, and periodic pulse signals are applied to prevent depth saturation of the magnetic core. In addition, by monitoring the adjusted magnetic core magnetic flux density recovery rate, demagnetization processing parameters and pulse signal strategies are optimized, and continuous and efficient operation of the system is ensured. According to the method, the transient voltage suppression capability and stability of the system are remarkably improved, and the overall performance and reliability are enhanced.

The invention discloses a transformation control method of an electronic transformer for a microwave oven, and belongs to the technical field of transformation control of electronic transformers, the method comprises the following steps: continuously collecting voltage data points through a sensor, carrying out time division according to a voltage range, and continuously obtaining use state data of an electric appliance; establishing a voltage-time relation model, fitting daily periodic fluctuation, and generating a predicted voltage fluctuation curve; before the microwave oven is used, the use time point is aligned with the voltage fluctuation curve, the predicted voltage is compared with the actual voltage of the current electric appliance use state, the voltage deviation is obtained, the obtained voltage deviation is used for correcting the preset heating power parameter, and the corrected parameter is used for rapidly switching the element to drive the electronic transformer. According to the method, the electronic transformer can adapt to power grid fluctuation in advance, the power deviation caused by voltage jump is effectively reduced by pre-judging the power grid state and adjusting the switch time sequence parameters in advance, and the control logic in different voltage scenes is optimized.

The invention provides a solid-state transformer. The solid-state transformer comprises a first-stage circuit, a first direct-current bus and a second-stage circuit, the first-stage circuit structure is used for receiving alternating-current electric energy and converting the alternating-current electric energy into first direct-current electric energy. The first DC bus is electrically connected to first DC electric energy. The second-stage circuit is electrically connected to the first-stage circuit through a first DC bus, and is configured to perform isolated step-down DC / DC conversion on the first DC electric energy to generate second DC electric energy. The first stage circuit is configured to operate with a modulation index greater than 1, and the modulation index is defined as a ratio of twice an AC voltage provided by the AC power to a voltage on the first DC bus.

The present invention discloses a nanocrystalline current transformer with DC component resistance and a method for using the same, comprising: a current transformer having a magnetic core hole extending from front to back in the middle of the front side of the current transformer. The device is provided with a secondary-side disconnection detection and protection mechanism, which effectively prevents the internal magnetic field imbalance of the transformer caused by the disconnection of the secondary circuit, avoids the core magnetic flux saturation and the generation of potential high electromotive force, thereby protecting the transformer itself and peripheral equipment, and reducing the risk of power system failures such as fire or short circuit. At the same time, a live conductor centering fixing mechanism is provided to ensure the stable centering position of the conductor in the transformer core hole, optimize the magnetic field distribution, reduce magnetic leakage, significantly improve the accuracy and stability of current measurement, and reduce measurement fluctuations introduced by conductor shaking, providing more accurate data support for harmonic analysis, fault detection, and power quality monitoring of the power system.

The invention discloses a server power supply system, a magnetic leakage compensation method, electronic equipment and a storage medium, and relates to the technical field of circuits, at least two bridged magnetic cores, namely at least two auxiliary magnetic cores, are added on the basis of a double-magnetic-core power supply, magnetic leakage detection is carried out through the auxiliary magnetic cores to determine magnetic leakage parameters, and meanwhile, the magnetic leakage compensation is carried out through the auxiliary magnetic cores. The compensation parameter is accurately calculated through the processor according to the magnetic leakage parameter, and the modulation signal is output to the auxiliary magnetic core according to the compensation parameter, so that magnetic leakage dynamic compensation is actively performed on the power supply through the auxiliary magnetic core, and the functions of magnetic flux directional control and magnetic leakage interference reduction are achieved. Therefore, the technical problem of how to improve the anti-interference capability of the power supply so as to improve the operation stability of the magnetic core can be solved, and the technical effects of reducing the magnetic leakage of the power supply so as to improve the anti-interference capability of the power supply are achieved.

The invention relates to the technical field of electronic power, in particular to a positive and negative voltage output circuit based on coreless transformer isolation, which comprises a cross-coupled oscillation circuit, a coreless transformer and a rectification filter circuit, and is characterized in that the cross-coupled oscillation circuit generates sine wave oscillation, and energy is transmitted to a secondary coil through a primary coil of the coreless transformer. The secondary coil adopts a center tap structure, the rectification filter circuit receives signals transmitted by the secondary coil, and stable positive and negative voltage output is realized through rectification and filtering processing. High-efficiency energy transmission is achieved through the coreless transformer, the voltage isolation capacity is improved, electromagnetic interference is reduced, and the coreless transformer has the advantages of being compact in structure, low in cost, high in power density and the like and is suitable for solid-state switch driving, high-frequency power conversion and other electronic power systems.

The invention discloses a rapid explosion suppression and flame prevention method for a transformer, and belongs to the technical field of power equipment safety, and the method specifically comprises the steps: S1, collecting multi-physical field data in real time through a sensor network disposed in the transformer; s2, based on the multi-physical field data, determining an electrothermal instability index, a fractal dimension of fire nucleus growth, a maximum characteristic value of an irradiance Hessian matrix and a spectral coherence length attenuation rate; s3, combining the electrothermal instability index, the fractal dimension of fire core growth, the maximum characteristic value and the spectral coherence length attenuation rate to construct a characteristic vector; and S4, identifying the initial fault state based on the feature vector, correcting the initial fault state by using a preset physical model to obtain a final fault state, and triggering a grading response strategy according to the final fault state. And a solid data basis is provided for subsequent accurate diagnosis.

The invention discloses a transformer explosion-proof and fault monitoring device and method, and belongs to the technical field of power equipment. The specific device comprises a transformer oil tank pressure reduction module, an on-load tap-changer pressure reduction module, an oil and gas separation tank, a gas discharge pipeline, a nitrogen injection module, a transformer protection control cubicle, an oil-immersed cable oil tank pressure reduction module and a transformer module. The specific method comprises the following steps: acquiring transformer data; calculating a power factor / loss factor according to the acquired transformer bushing current; setting early warning threshold values of transformer capacitance, a power factor / loss factor and a partial discharge signal, and judging whether the data reach the corresponding early warning threshold values or not; and after any data in the judgment result reaches an early warning threshold value, judging that the transformer has a fault, triggering early warning and performing transformer pressure relief, thereby realizing explosion prevention and fault monitoring of the transformer. According to the invention, pressure relief protection of the transformer cable box, the on-load tap-changer module and the main oil tank is realized, and online monitoring and fault diagnosis of key monitoring signals are provided.

A single-torus ohmmeter for measuring a loop impedance Zx, includes a single transformer having a primary winding of Np coils and a secondary winding of a single coil forming the measurement loop, in which, to compensate for a stray induction produced by an AC leakage current circulating in the measurement loop without canceling a measurement current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer includes a second secondary winding of Na coils whose output voltage Ub representative of the AC leakage current is delivered to a processing module providing a voltage intended to be added to an alternating measurement voltage Vp in an adder delivering the current to be injected into the primary winding after passage through a voltage-current converter.

The invention relates to the technical field of capacitive voltage transformers, in particular to a capacitive voltage transformer and a capacitance variation adjusting system thereof. The adjusting system comprises a capacitance measuring module which is provided with two groups of test electrodes, one group is connected with a high-voltage electrode of a high-voltage capacitor in parallel and obtains a high-voltage capacitance value, and the other group is connected with a low-voltage capacitor electrode in parallel and obtains a low-voltage capacitance value; the processing control module is used for receiving the high-voltage capacitance value and the low-voltage capacitance value, judging whether the ratio of the high-voltage capacitance value to the low-voltage capacitance value exceeds a preset threshold value or not, calculating a capacitance value needing to be compensated when the ratio exceeds the preset threshold value, and generating compensation information according to the capacitance value needing to be compensated; and the compensation intervention module comprises a plurality of compensation capacitors with different capacitance gradients, and is configured to receive the compensation information and connect the specified compensation capacitors in series according to the compensation information. Safe and stable operation of the capacitive voltage dividing assembly is ensured through the gas insulating medium, and the performance and reliability of the capacitive voltage transformer are improved through the adjusting system.

A method of controlling the magnetic saturation of the core of a DC common mode choke comprising a magnetic core 1 and first and second coils 2, 3, comprises: determining the saturation percentage of

This invention discloses a novel AC / DC hybrid power electronic transformer, comprising a transformer housing, a power module housing, and an auxiliary circuit housing. The transformer housing houses transformer windings, a current transformer, and a BCT terminal box. The auxiliary circuit housing includes a power distribution unit, a lightning protection unit, a bypass protection unit, and a maintenance component unit. The power module housing includes an AC / DC module and a DC / AC module. The transformer boasts a compact overall design, making it more suitable for dual-pole cross-arm installation in substations, reducing construction complexity. In AC / DC hybrid mode, it achieves flexible power coordination between the AC and DC grids, while meeting output voltage compliance requirements under varying input voltage conditions and enabling continuous online regulation.

The application discloses a capacitive voltage transformer and a processing method, device and storage medium thereof. The capacitive voltage transformer comprises a frequency relay arranged in a secondary winding of an intermediate transformer and used for detecting a voltage frequency in a circuit in which the capacitive voltage transformer is located, wherein the intermediate transformer is an intermediate transformer in an electromagnetic unit of the capacitive voltage transformer; a connecting plate connected with the intermediate transformer and used for adjusting a working frequency of the capacitive voltage transformer according to the voltage frequency; and a compensation reactor connected with the connecting plate and used for adjusting a reactance value in the circuit according to a terminal of the connecting plate. Through the application, the problem that the capacitive voltage transformer can only work at one frequency in the prior art and the use range of the capacitive voltage transformer is small is solved.

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 relates to the technical field of transformers, in particular to a pre-magnetizing control device and circuit. The pre-magnetizing control device comprises a microcontroller, a signal acquisition circuit, a relay output circuit and a crystal oscillator circuit, the signal acquisition circuit, the relay output circuit and the crystal oscillator circuit are respectively connected with the microcontroller, and the signal acquisition circuit is used for acquiring a trigger signal and a control signal generated by system operation. The relay output circuit is used for controlling starting and stopping of pre-magnetizing, and the crystal oscillator circuit is used for controlling the time of pre-magnetizing. The pre-magnetizing control device can effectively control the closing magnetizing inrush current of the transformer and abandon some easily-damaged elements, can meet various pre-magnetizing requirements, and is high in universality.

The present invention discloses an automotive ignition coil and its ignition controller, and the technical solution is as follows: An energy storage module is arranged on the main housing, and the energy storage module is electrically connected in parallel with the primary coil. When the primary coil is connected to a DC power supply, the energy storage module and the primary coil respectively store electric field energy and magnetic field energy synchronously. There is an inversion circuit electrically connected between the energy storage module and the primary coil. When the inversion circuit responds to the disconnection of the DC power supply and the primary coil, it connects the energy storage module and the primary coil to provide a reverse voltage that is reversely transmitted to the primary coil, and the magnitude of the reverse voltage is equal to the self-inductive voltage generated by the primary coil. Through energy storage components, the present invention realizes that when the coil is powered off, the self-inductive voltage generated by the inductance is offset by the reverse current voltage, thereby achieving the effect of quickly eliminating the magnetic field, realizing the instantaneous disappearance of the magnetic field in the primary coil, demagnetizing the iron core, and the magnetic force lines rapidly contracting and cutting the secondary coil to generate high voltage for ignition operation.

The invention discloses an overvoltage protection device for a single-core asymmetric phase-shifting transformer. The overvoltage protection device comprises a phase-shifting transformer branch, a first branch switch, a second branch switch and an overvoltage protection circuit, wherein the phase-shifting transformer branch comprises the single-core asymmetric phase-shifting transformer and the first branch switch; a winding of the single-core asymmetric phase-shifting transformer is connected in parallel with a corresponding internal voltage transformer; the lightning arrester branch comprises a lightning arrester and a second branch switch; the external voltage transformer branch comprises an external voltage transformer; when it is judged that the single-core asymmetric phase-shifting transformer does not have overvoltage, the first branch switch is switched on, and the second branch switch is switched off; when it is judged that the single-core asymmetric phase-shifting transformer has the external overvoltage, the first branch switch and the second branch switch are closed; and when the internal voltage transformer detects that the single-core asymmetric phase-shifting transformer has internal overvoltage, the first branch switch and the second branch switch are closed. According to the invention, overvoltage protection can be carried out on the single-core asymmetric phase-shifting transformer.

In a wireless power transfer apparatus, a characteristic adjuster has a frequency characteristic that causes, in a power transfer mode from at least one power transmission unit to a power receiving apparatus, a resonant power transmission circuit to have a resonance frequency that substantially matches an operating frequency. The reactance of a power transmission coil has a reference value in the power transfer mode. The frequency characteristic of the characteristic adjuster causes, in a power non-transfer mode from the at least one power transmission unit to the power receiving apparatus, a reactance of a power transmission coil to become an adjusted value that is higher than the reference value.

A wireless charging system may include a wireless power receiving device that receives wireless power signals from a wireless power transmitting device. The wireless power receiving device may include first and second chokes connected to respective first and second ends of a wireless power transfer coil. The first and second chokes may be disposed relative to the magnet in a manner to reduce relative inductance differences.

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.

An electronic component includes a first main body including a circuit section, and a second main body mounted on the first main body and including a sub-circuit section. The first main body further includes a plurality of electrode pads. The second main body further includes a plurality of terminals. The plurality of electrode pads include a first electrode pad and a second electrode pad. The plurality of terminals include a first terminal connected to the first electrode pad, and a second terminal connected to the second electrode pad. The circuit section is connected to the first electrode pad. The sub-circuit section is connected to the second terminal. A distance between centers of the first electrode pad and the second electrode pad is greater than a distance between centers of the first terminal and the second terminal.