149results about "Transformers/inductances circuits" patented technology

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 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.

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 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.

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.

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

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.

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.

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.

The utility model 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, 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 realized through the coreless transformer, the voltage isolation capability is improved, electromagnetic interference is reduced, and the coreless transformer has the advantages of compact structure, low cost, high power density and the like, and is suitable for solid-state switch driving, high-frequency power conversion and other electronic power systems.

The embodiment of the invention discloses a magnetic integrated inductor and a magnetic integrated circuit applying the magnetic integrated inductor, which are applied to the technical field of electromagnetism, the magnetic integrated inductor is characterized in that a first magnetic core and a second magnetic core are oppositely arranged in parallel, and N wrapping posts and M middle posts are integrally integrated between a first magnet yoke and a second magnet yoke which are shared; the multi-phase winding wound on the wrapping post realizes high-efficiency energy transmission and interphase coupling through a closed magnetic circuit, and the middle post with shorter axial length naturally forms an air gap inside the magnetic core when the two magnetic cores are butted, so that a stable filter inductance path is formed; the filtering function does not depend on an external independent inductor any more, but is embedded in the middle column area of the main magnetic core, so that an extra magnetic core, a framework and a packaging space are omitted, and the overall size is remarkably reduced; meanwhile, all the windings are tightly adjacent to the middle column in the physical layout, and the wiring path is greatly shortened and concentrated on the same end face of the magnetic core.

The utility model discloses a self-monitoring choke transformer which comprises a choke transformer body and a self-monitoring device, the self-monitoring device is installed on the choke transformer body, the choke transformer body and the self-monitoring device are integrally arranged in a box body of the choke transformer, and the choke transformer body comprises a traction coil and a signal coil. The traction coil and the signal coil are oppositely arranged, the self-monitoring equipment comprises a monitoring and diagnosing module and a current sensor, the monitoring and diagnosing module is connected with the current sensor, the current sensor comprises a single-head sensor and a double-head sensor, the single-head sensor is connected with the signal coil, and the double-head sensor is connected with the traction coil. The indoor side current and the steel rail side current of the trackside choke transformer equipment are collected in real time, the monitoring and diagnosis module analyzes, extracts and calculates mixed signals, basic operation data of a track circuit can be collected conveniently, and analysis and fault positioning of faults such as traction unbalanced current, steel rail insulation joint insulation damage, rail breakage and adjacent line interference are assisted.

The invention relates to the technical field of conductive connection, and discloses a strip-shaped conduction-based transformer grounding device, which comprises a first rotating block and a second rotating block which are rotationally mounted on a supporting block, first flat iron is mounted on the first rotating block through a first locking piece, and second flat iron is mounted on the second rotating block through a second locking piece. The first flat iron and the second flat iron can be connected by one worker. The first rotating block and the second rotating block can rotate relative to the supporting piece so that the actual installation angle between the first flat iron and the second flat iron can be conveniently adjusted, it is guaranteed that the first flat iron and the second flat iron make large-area contact with the ground, and then the connection stability is enhanced.

The application discloses a transformer non-electric quantity protection system, which comprises a collection module, an inlet module and a master control module.The collection module is used for collecting the pressure inside the transformer to obtain pressure information and sending the pressure information to the master control module; the inlet module is used for collecting and processing the pressure relief diaphragm state and the pressure relief baffle state of the transformer and sending the pressure relief diaphragm state information and the pressure relief baffle state information to the master control module; the master control module is used for receiving the pressure relief diaphragm state information and the pressure relief baffle state information sent by the inlet module, performing logical judgment according to the pressure relief baffle state information and the pressure relief diaphragm state information, sending a trip command to the outlet module when the fault condition is met, and cutting off the power supply of the transformer by the outlet module.When the transformer encounters an arc fault with high energy, the application can collect non-electric quantity information caused by the action of the pressure release system, send an action signal after logical judgment, and cut off the power supply of the transformer in time, so that the pressure wave is prevented from causing damage to other positions.

Power control apparatus for modulating electrical power signals and methods for modulating electrical power signals are disclosed. In one example, a power control apparatus comprises a magnetic core comprising a first limb and a second limb, with a primary winding around the first limb, and a secondary winding around the second limb. The power control apparatus comprises a voltage source converter having an AC connection, a DC connection, and a controller. The controller is configured to receive data associated with parameters of a first signal in the primary winding, compare the parameters of the first signal to parameters of a reference signal for the secondary winding, determine a harmonization signal which, when applied to the first limb, causes a second signal in the secondary winding to approximate the reference signal. The controller is configured to cause application of the harmonization signal to the first limb using the voltage source converter.

A transformer circuit and a method for decreasing no-load power consumption, the transformer circuit comprising a transformer (30) and an auxiliary winding circuit (10), the transformer (30) comprising an iron core (34), a primary winding (32), a secondary winding (33) and an auxiliary winding (31), the auxiliary winding circuit (10) being connected to the auxiliary winding (31), the auxiliary winding circuit (10) comprising a first power supply circuit (11) and a second power supply circuit (12), and the auxiliary winding (31) comprising a first end (1), a second end (2) and a tap (3) located between the first end (1) and the second end (2). The present method decreases no-load power consumption.

The present technology relates to circuit breaker devices having current sense transformers. The current sense transformer includes a core, a secondary winding, and a primary winding coupled to the power input. The secondary winding includes a first wire wrapped around the core a number of secondary winding turns. The primary winding includes a second wire wrapped around the core a number of primary winding turns. The number of primary winding turns includes a first number of primary winding turns in a first direction and a second number of primary winding turns in an opposite direction that magnetically cancel out the second number of primary winding turns in the first direction to generate an effective number of primary winding turns. The effective number of primary winding turns and the number of secondary winding turns make up a desired turns ratio.

The application discloses a kind of transformer explosion-proof and fault monitoring device and method, belong to electric power equipment technical field.The specific device includes transformer oil tank pressure relief module, on-load tap changer pressure relief module, oil and gas separation tank, gas discharge pipeline, nitrogen injection module, transformer protection control cabinet, oil-immersed cable oil tank pressure relief module and transformer module, specific method includes: collecting transformer data;According to the power factor / loss factor of transformer bushing current collected calculation;Set transformer capacitance, power factor / loss factor and the early warning threshold of partial discharge signal and judge whether data reaches corresponding early warning threshold;Any data reaches early warning threshold in judgment result, determine transformer fault, trigger early warning and carry out transformer pressure relief, realize transformer explosion-proof and fault monitoring.The application realizes the pressure relief protection of transformer cable box, on-load tap changer module and main oil tank, and proposes online monitoring and fault diagnosis of key monitoring signals.

A power transformer and a power transformation method. The power transformer includes a power stage circuit, a ramp generation circuit, a calculation circuit and a control circuit. The power stage circuit generates an output signal according to an input signal and a control signal. The ramp generation circuit generates a ramp signal according to the control signal, the input signal and the output signal. The calculation circuit generates a calculation signal according to the output signal and a reference signal. When the power transformer operates in a light load state, the calculation circuit operates in a first mode. When the power transformer operates in a normal state, the calculation circuit operates in a second mode. The control circuit generates the control signal according to the calculation signal and the ramp signal. The control circuit includes a comparison circuit and a control signal generator. The comparison circuit generates a comparison signal according to the calculation signal and the ramp signal. The control signal generator generates the control signal according to the comparison signal. Thus, fast seamless transition can be achieved without the aforementioned additional switching circuit, thereby reducing circuit cost and circuit size.

The present technology relates to circuit breaker devices having current sense transformers configured to protect loads against current overload and short circuit events. The current sense transformers include a core, a secondary winding, and a primary winding coupled to a power input. The secondary winding includes a first wire wrapped around the core a number of secondary winding turns. The primary winding includes a second wire wrapped around the core a number of primary winding turns. The number of primary winding turns includes a first number of primary winding turns in a first direction and a second number of primary winding turns in an opposite direction that magnetically cancel out the second number of primary winding turns in the first direction to generate an effective number of primary winding turns. The effective number of primary winding turns and the number of secondary winding turns make up a desired turns ratio.

The invention discloses a magnetic core structure and an anti-DC bias inductor. The magnetic core structure comprises a main magnetic core, an auxiliary magnetic core and a short circuit ring, the main magnetic core forms a main magnetic circuit through a wound main winding; the auxiliary magnetic core bypass is arranged on the main magnetic core, the short circuit ring is arranged on the auxiliary magnetic core and used for isolating alternating-current magnetic flux of the main magnetic circuit, and then the auxiliary magnetic core forms a direct-current magnetic circuit for shunting direct-current magnetic flux in the main magnetic circuit through the short circuit ring. The anti-DC bias inductor comprises the magnetic core structure. The beneficial effects of the application are that through the bypass DC magnetic circuit, the attenuation effect of the DC bias on the magnetic conductivity of the power inductor can be effectively reduced, the effect of achieving a high increment inductance value with a small number of turns is achieved, the DC winding loss of the power inductor can be directly reduced, and the loss of the power inductor can be reduced. The reduced inductance ripples can also reduce winding loss and magnetic core loss, so that the temperature rise of the inductor can be improved. And the direct-current magnetic circuit basically does not increase magnetic core loss, and temperature rise control is facilitated.

To obtain stable characteristics without deteriorating zero phase current characteristics by suppressing distortion of a plurality of layers of iron cores due to curing shrinkage stress of an insulating resin.SOLUTION: Disclosed is a method of manufacturing a split type zero phase current transformer which includes the steps of: housing and fixing a work in process 130, in which a secondary coil 15 is wound around a plurality of layers of semi-annular iron cores 13, in a mold 23; and obtaining a second work in process in which the iron core 13, a secondary coil 15, and a spacer 19 are covered with a thermosetting resin by arranging the spacer 19 between the center part in the circumferential direction of the inner peripheral surface of the work in process 130 and the mold 23, and then casting and curing the thermosetting resin in the mold 23.SELECTED DRAWING: Figure 13

An isolation type LVDT signal processing system based on digital signal transmission comprises a system power supply module, an isolation power supply circuit, a power main circuit, a tested mechanism, a bus signal transmission circuit and an LVDT decoding circuit. A system power supply generated by the system power supply module is transmitted to the isolation power supply circuit and the power main circuit, the isolation power supply circuit generates three paths of control power, and the three paths of control power are respectively transmitted to the bus signal transmission circuit, the LVDT decoding circuit and the power main circuit; the power main circuit drives a tested mechanism; a signal output by the tested mechanism is transmitted to the LVDT decoding circuit, and the LVDT decoding circuit outputs a digital conditioning signal and transmits the digital conditioning signal to the bus signal transmission circuit; and the bus signal transmission circuit transmits the digital conditioning signal to external equipment. According to the signal processing system, the anti-interference capability of LVDT signals is improved through the LVDT decoding circuit, and the problem that the LVDT signals are prone to distortion, attenuation and distortion in long-distance transmission is solved.

The invention relates to a debugging circuit, method and device of a transformer, an application circuit of the transformer, equipment, a storage medium and a program product. The debugging circuit comprises the components of a transformer which comprises a primary coil and a secondary coil; the signal generator is connected with the two ends of the primary coil and used for providing input voltage for the primary coil; one end of the current adjusting assembly is connected with the negative electrode end of the primary coil, and the other end is connected with the positive electrode end of the secondary coil; and the oscilloscope is connected with the current adjusting assembly and is used for outputting the voltage change after the current is adjusted by the current adjusting assembly so as to determine the compensation capacitance of the transformer and adjust the coil winding of the transformer based on the voltage change. The common-mode noise of the transformer is effectively suppressed through the debugging circuit, and the electromagnetic anti-interference capability of the transformer in the use process is improved.

The invention discloses an integrated electronic component and a resonant converter circuit. The integrated electronic component for a converter comprises a magnetic core, a first primary side winding, a second primary side winding, a first secondary side winding and a second secondary side winding. The magnetic core is provided with a first column and a second column which are arranged at an interval, wherein the first column and the second column are located on a magnetic flux path. The first primary side winding and the first secondary side winding are wound on the first column, and the second primary side winding and the second secondary side winding are wound on the second column. Wherein the first secondary side winding and the second secondary side winding are respectively coupled with at least one first rectification switch and at least one second rectification switch, and the conduction periods of the at least one first rectification switch and the at least one second rectification switch are different.

The invention relates to a current transformer capable of automatically switching the transformation ratio and an automatic transformation ratio switching method, and belongs to the technical field of current transformers, the current transformer comprises a current transformer body, and a secondary winding of the current transformer body is provided with at least two groups of output taps with different transformation ratios; the current detection unit is used for sampling primary side current in real time and calculating an effective value; the transformation ratio switching execution unit is connected to the output tap and used for changing the effective turn ratio connected to the measurement loop; the intelligent control unit is electrically connected with the current detection unit and the transformation ratio switching execution unit; and the protection unit is used for preventing a secondary side open circuit of the current transformer body in the transformation ratio switching process and in an abnormal state. The optimal transformation ratio is dynamically calculated in combination with current real-time and historical data, the transformation ratio switching execution unit is driven to automatically adjust the effective turn ratio of the secondary winding, and the problem that the measurement precision of a traditional current transformer is reduced due to the fixed transformation ratio in a wide load range is solved.

The invention relates to the technical field of transformers, and discloses a switching power supply transformer control method and device, a switching power supply transformer and a medium. When it is detected that the current resonant frequency is smaller than the preset frequency, the access inductance value of the secondary coil connected to the two ends of the capacitive load is reduced. According to the invention, the current resonant frequency of the switching power supply transformer is monitored in real time, and because the participated resonant inductance is inversely proportional to the resonant frequency, when the current resonant frequency is smaller than the preset frequency, the resonant frequency is improved by reducing the access inductance value of the secondary coil of the transformer connected to the two ends of the capacitive load; therefore, the noise generated in the working process of the switching power supply transformer is reduced, the noise reduction of the transformer is realized, and the user experience is improved.

The utility model belongs to the technical field of electrical control, and provides a new energy European box transformer substation circuit which comprises a main transformer, the high-voltage side of the main transformer is connected with a high-voltage line, the low-voltage side of the main transformer is connected with a low-voltage line, and the low-voltage side of the main transformer is further connected with a cooling line. The cooling circuit comprises a knife fuse switch, an auxiliary transformer, a first miniature circuit breaker, a second miniature circuit breaker, a third miniature circuit breaker, a transformer body heat dissipation fan and a transformer chamber grading starting heat dissipation fan, and the first miniature circuit breaker is provided with an under-voltage release accessory; and the first miniature circuit breaker is connected with a frame circuit breaker secondary control loop of a low-voltage line through an under-voltage release auxiliary contact. According to the utility model, the phenomenon that the main transformer runs at high temperature and is burnt out due to the loss of a working power supply of the heat dissipation fan because the overall damage of the box transformer or the loss of an auxiliary secondary power supply in the box transformer caused by the burning and fault of the auxiliary transformer can be reduced or prevented.

The application discloses a C-shaped iron core combined rotary loose coupling transformer, which comprises a fixed assembly and a rotary assembly. The fixed assembly comprises a fixed iron core, first and second fixed windings and a fixed side circuit; the longitudinal section of the fixed iron core is in the shape of a C letter, and the fixed iron core comprises a first fixed iron core, a second fixed iron core and a third fixed iron core; the rotary assembly comprises a rotary magnetic core, a rotary shaft, a rotary bearing, a rotary clamping groove, first and second radial rotary rings, first and second rotary windings and a rotating side circuit; the fixed iron core surrounds the outer periphery of the rotary shaft in the radial direction, and the fixed iron core and the rotary shaft are fixed by the rotary bearing; the first fixed winding and the second fixed winding are connected in series, and the first rotary winding and the second rotary winding are also connected in series. The C-shaped iron core combined rotary loose coupling transformer designed by the application reduces the axial size and weight, improves the power transmission capacity, and first connects the rotating side circuit with a matrix converter.