108 results about "Transformer coupling" patented technology

The invention discloses an intelligent monitoring and early warning system and method for agricultural non-point source pollution, and relates to the technical field of environmental monitoring, accurate prediction of water pollutant concentration is realized through multi-source heterogeneous data acquisition and fusion, a dynamic attention mechanism and a PINN-Transformer coupling model, the system extracts data spatial and temporal characteristics by using an optimized Transformer model, and the method is applied to the intelligent monitoring and early warning of agricultural non-point source pollution. A water pollution diffusion physical constraint is embedded, it is ensured that a prediction result conforms to an actual hydrodynamic law, and based on high-precision spatial-temporal distribution data, an intelligent algorithm is adopted to track a pollution diffusion path and rapidly lock a pollution source; meanwhile, the cellular automaton model simulates pollution risk dynamic diffusion and assists regional risk assessment, the system also combines a block chain technology to carry out credible evidence storage on key monitoring data, and real-time data processing and early warning pushing are realized through a cloud edge collaborative architecture. And an efficient and reliable technical solution is provided for agricultural water environment management and pollution prevention and control.

An IPD high-selectivity band-pass filter based on a weak coupling transformer technology comprises an LC parallel resonance circuit, an LC series resonance circuit, an LC parallel resonance circuit and a fourth capacitor C4, and inductors in the LC parallel resonance circuit and inductors in the LC parallel resonance circuit have a weak transformer coupling relation; the coupling coefficient required by the weak coupling transformer provided by the invention is very small and can be realized in a mode of adjacently placing metals on the same layer, so that the structural complexity of the filter is effectively reduced; the band-pass filter is based on an IPD technology, an extra decoupling equivalent inductor is introduced through a weak transformer coupling technology, the extra decoupling equivalent inductor and a parallel capacitor which is connected between the input end and the output end of the filter in a bridging mode form a new resonance path, and a transmission zero point is introduced into an upper stop band and a lower stop band of the filter respectively to improve the selectivity of the filter. According to the invention, the selectivity of the filter can be effectively improved on the premise of not additionally introducing an inductance element and not increasing the order of the filter.

An isolated bi-directional DC conversion circuit and a method for controlling the same are provided. The DC conversion circuit includes a transformer with a first energy storage element and a primary-side rectification bridge coupled to the primary side of the transformer and a second energy storage element and a secondary-side rectification bridge coupled to the secondary side of the transformer. The primary-side rectification bridge consists of multiple first power switching devices. The secondary-side rectification bridge consists of multiple second power switching devices. Each of the multiple first and the second power switching devices have a body diode in inverse parallel connection therewith. The DC conversion circuit further includes multiple first sampling resistors provided on each bridge arm of the secondary-side rectification bridge and a controller configured to perform switch control on the multiple second power switching devices based on a sampled voltage of the multiple first sampling resistors.

The invention discloses an intelligent simulation method for a runoff process in a region lacking data, and belongs to the technical field of hydrological simulation. The method comprises the following steps: step 1, collecting basic data; step 2, constructing an SWAT hydrological model and outputting physical variables; step 3, an SWAT-LSTM-Transform three-level coupling framework is constructed, and the SWAT-LSTM-Transform three-level coupling framework 4, carrying out transfer learning on the SWAT-LSTM-Transform coupling model, and carrying out transfer learning on the SWAT-LSTM-Transform coupling model; and step 5, runoff simulation and performance evaluation. According to the method, the Transform model and the SWAT-LSTM coupling model are creatively linked together, the adaptability and reliability under the condition of data scarcity are remarkably improved, compared with the prior art, the runoff simulation precision of the method in a region lacking data is improved by 20%, and an innovative solution is provided for hydrological research of the region lacking data.

A flyback converter to receive an input voltage and provide an output voltage is provided, and may include a transformer having a primary winding and secondary winding, a primary switch coupled to the primary winding, a synchronous rectifier device coupled to the secondary winding, and a secondary side control circuit to turn on the synchronous rectifier device by outputting a control signal at a first amplitude, subsequently modify the control signal to maintain a voltage across the synchronous rectifier device substantially constant until a predicted time that precedes a current in the synchronous rectifier device reaching substantially zero, subsequently turn off the synchronous rectifier device based on the voltage across the synchronous rectifier device reaching substantially zero, and subsequently turn on the synchronous rectifier device by outputting the control signal at a second amplitude, before the primary switch is turned on. The second amplitude is less than the first amplitude.

Methods and apparatus for amplifying a signal for transmission via an amplifier circuit are described. An example amplifier circuit generally includes an amplifier configured to amplify a signal for wireless transmission and including a first transistor and a second transistor. The amplifier circuit also includes: a transformer coupled to an output of the amplifier; a first coil coupled to the first transistor and inductively coupled to the transformer; and a second coil coupled to the second transistor and inductively coupled to the transformer.

The invention discloses an on-chip active reconfigurable filter passband flatness optimization method and circuit, and belongs to the field of integrated circuits and wireless communication. The filter comprises a coupling element, negative resistance compensation units are connected to the two ends of the coupling element and connected with the coupling element in parallel, and the coupling element comprises a coupling inductor or a coupling capacitor. The invention provides a passband flatness method based on active coupling compensation by deeply analyzing the passband flatness distortion reason of the on-chip coupling filter, and designs a detailed controllable negative resistance unit to compensate the coupling (inductive coupling) loss of the base transformer, thereby greatly reducing the in-band insertion loss variation of the filter, and improving the filter performance. And the amplitude consistency of the signal after passing through the filter is improved.

A system comprises at least one transformer for galvanically isolating the system from an electrical power grid and adapting an input voltage level associated with an alternating current received from the electrical power grid. A converter unit connected to the transformer is configured to convert the alternating current into a direct current output between a positive pole and a negative pole. The converter unit comprises at least one modular multilevel converter comprising at least two converter branches. Each branch comprises a converter cell and an inductor. One branch is connected from an AC line of the transformer to the positive pole and another branch is connected from the AC line to the negative pole. An electrolyser unit may be arranged between the positive and negative poles, and a control unit may be configured to control the direct current output based on a reference value.

The invention discloses a BIM-based hoisting construction risk data intelligent processing system, and the system comprises an Internet of Things sensing layer which carries out the sensing through the deployment of a multi-mode sensor network; the BIM-IoT data fusion layer is used for directly embedding sensor time sequence data into a BIM component attribute set by using an IFC + + spatio-temporal extension framework, and dynamically updating the sensor time sequence data through a native data pipeline; the spatio-temporal feature extraction layer is used for fusing and enhancing BIM topological features and IoT time sequence features by adopting an ST-Encoder network architecture through double-flow feature extraction and a cross-modal attention fusion mechanism in combination with prior information; the hybrid reasoning decision-making layer is used for fusing a PINN-Transformer coupling model and an FEM-Neural joint calculation mechanism, and predicting stress through physical constraint enhancement, nonlinear local modeling and an alternate execution strategy; and the digital twinning execution layer is used for real-time rendering, historical playback, prediction simulation, component-level information superposition and virtual security fencing of the construction process.

The invention discloses a double-domain BBO transformer coupling fault diagnosis method based on a habitat transformation mechanism, and the method comprises the steps: constructing a chemical domain population and an electromagnetic domain population based on the operation feature data of a transformer; constructing a fault coupling matrix; fitness values of habitats in the current chemical domain population and the electromagnetic domain population are calculated, and migration operation of the standard BBO is executed based on the fitness values; in each iteration of executing the basic migration operation, when an elitist solution meeting a preset condition exists in the electromagnetic domain population, performing habitat transformation on the chemical domain population according to the elitist solution and the fault coupling matrix, including search space distortion and feature dimension dynamic reconstruction; and calculating fitness values of the current electromagnetic domain population and the chemical domain population, and determining the fault type of the transformer through weighted fusion. According to the method, the transformer to be detected does not need to be subjected to power failure hanging cover detection, high-precision state evaluation can be realized only by using online monitoring data, the operation and maintenance cost can be saved, and the method has extremely high engineering practical value.

A frequency synthesis circuit includes a first inductor coupled to receive a first input signal at an input frequency, and a second inductor coupled to receive second input signal at the input frequency and out-of-phase relative to the first input signal. The circuit has first and second transistors with control terminals coupled to the first and second inductors, respectively. A first resonant tank of an inductor in parallel with a capacitor is coupled between a power supply terminal and the first transistor. A second resonant tank of an inductor in parallel with a capacitor is coupled between the power supply terminal and the second transistor. The first and second resonant tanks are tuned to a selected harmonic of the input frequency. An injection-locked oscillator has inputs coupled to the first and second transistors.

The application provides a power supply chip. The power supply chip comprises a first sub-chip, a second sub-chip, a transformer and an isolator. The first sub-chip comprises an isolated power supply transmitting module and a driving circuit control module. The second sub-chip comprises an isolated power supply receiving module and a driving circuit buffer module. The isolated power supply transmitting module is used for converting a first current signal input by an input end of the power supply chip into a second current signal, and inputting a third current signal output by the second current signal after coupling by the transformer to the isolated power supply receiving module. The third current signal is used for supplying power to the driving circuit buffer module. The driving circuit control module is used for outputting a driving signal based on a first control signal input by the input end of the power supply chip, and inputting the driving signal to the driving circuit buffer module through the isolator. The power supply chip provided by the application can reduce the area occupied by the mainboard of the switching power supply system, and further reduce the volume of the mainboard of the switching power supply system.

Techniques and apparatus for oscillating signal generation using a multi-mode voltage-controlled oscillator (VCO) circuit with transformer-based coupling. An example VCO circuit generally includes a first pair of transistors associated with a first active negative transconductance circuit; a second pair of transistors associated with a second active negative transconductance circuit; a transformer comprising a primary winding and a secondary winding, the primary winding being coupled to the second pair of transistors; a first set of switches coupled between gates of the first pair of transistors and the secondary winding of the transformer; and a second set of switches coupled between the gates of the first pair of transistors and a first voltage node.

The utility model relates to the technical field of circuit design, in particular to an MOS (Metal Oxide Semiconductor) isolation driving circuit, which comprises a transformer, a first MOS tube and a second MOS tube, the transformer comprises a first coil and a second coil; the first coil comprises a first pin position and a second pin position; the second coil comprises a third pin position and a fourth pin position; a second pin position of the first coil is connected with a drain electrode of the first MOS tube; and the fourth pin of the second coil is connected with the grid electrode of the second MOS tube. According to the utility model, the transformer coupling mode is realized through the electromagnetic induction relation between the two coils of the transformer, and a traditional blocking capacitor is omitted, so that the problem that the amplitude of the output driving voltage changes along with the duty ratio is avoided. Meanwhile, due to the fact that no blocking capacitor exists, the stability of the output voltage only depends on the induction voltage of the primary coil of the transformer, the induction voltage is in proportional relation with the input voltage, and therefore the stability of the driving voltage is ensured and is not affected by the duty ratio.

The invention relates to the technical field of capacitor detection, in particular to a capacitor aging detection and energy recovery system which mainly comprises a control module, an implosion detection module and an energy recovery module, a transformer of the implosion detection module is coupled in a to-be-detected charging loop, the charging loop at least comprises one aging capacitor, and the energy recovery module is connected with the control module. When the transformer detects the abrupt change magnetic field, an abrupt change signal is generated. According to the invention, the electromagnetic induction principle is utilized, the change of current can be detected in an extremely short time, rapid detection of abrupt change current during implosion is realized, and the system uses the controllable discharge and energy recovery unit, so that the energy of the capacitor is recovered to the power supply system or the energy storage system, energy regeneration is realized, the energy efficiency is improved, and the energy consumption is reduced. And the energy-saving and environment-friendly effects are achieved.

This invention provides a design method for a high-order matching network applied to an ultra-wideband amplifier. It involves deriving equivalent modules for the single-port preamplifier input and output stages; determining the internal structure of the high-order matching network and the transformer coupling coefficient; analyzing and obtaining the mismatch coefficient of the high-order matching network; and transforming the calculation of the load resonator quality factor into solving the constraint conditions based on the constraints between the transformer coupling coefficient, the high-order matching network mismatch coefficient, and the load resonator quality factor. The source resonator quality factor is then obtained based on the mismatch relationship between the load resonator quality factor and the high-order matching network. Finally, the parameter values ​​of the internal components of the high-order matching network are determined, resulting in the final designed high-order matching network. Compared to existing technologies, this invention achieves impedance matching between the source and load over an ultra-wideband range and enables high-gain flatness amplification within the ultra-wideband range.

The present disclosure provides a three-active-bridge converter decoupling control method, a three-active-bridge converter and a photovoltaic system. The first port, the second port and the third port of the three-active-bridge converter are coupled through a transformer, and each of the first port, the second port and the third port has a resonant cavity including a switch-controlled resonant capacitor with adjustable capacitance and a resonant inductor. By adjusting the capacitance of the third port, the resonant frequency of the third port is set to the operating frequency of the three-active-bridge converter, thereby realizing power decoupling between the first port and the second port. By adjusting the number of switch capacitor branches of different ports, the resonant frequency of the resonant cavity circuit of each port and the transmission power between the ports can be adjusted, thereby providing greater freedom for power regulation between the ports.

Techniques and apparatus for oscillating signal generation using a multi-mode voltage-controlled oscillator (VCO) circuit with transformer-based coupling. An example VCO circuit generally includes a first pair of transistors associated with a first active negative transconductance circuit; a second pair of transistors associated with a second active negative transconductance circuit; a transformer comprising a primary winding and a secondary winding, the primary winding being coupled to the second pair of transistors; a first set of switches coupled between gates of the first pair of transistors and the secondary winding of the transformer; and a second set of switches coupled between the gates of the first pair of transistors and a first voltage node.

Provided is an integrated power supply device in which AC sides of three or more DC / AC circuits are coupled by a transformer having three or more windings, said integrated power supply device being capable of accurately outputting power in all of the assumed operation modes (power directions) without adding a discharge device, and being capable of reducing loss. In an integrated power supply device in which AC sides of three or more DC / AC circuits are coupled by a transformer having three or more windings, the three or more DC / AC circuits include: a first DC / AC circuit having a first switching circuit and a capacitor connected in parallel with the first switching circuit; and a second DC / AC circuit that has a second switching circuit connected to a power storage unit, and when power is supplied from the second DC / AC circuit to a load connected to a DC / AC circuit other than the first DC / AC circuit, if the first switching circuit has no load or the connected load is equal to or less than a predetermined power consumption value, the first DC / AC circuit is switched on or off by the second switching circuit, and the second DC / AC circuit is switched on or off by the second switching circuit when power is supplied from the second DC / AC circuit to the load connected to the DC / AC circuit other than the first DC / AC circuit. The first switching circuit is switched so that a period during which power is supplied from the capacitor to the first switching circuit is set.

The invention relates to detecting transformer saturation in a switched mode power supply. According to an embodiment, a flyback converter includes a transformer, a power switch coupled to a primary winding of the transformer, and a controller. The controller includes a voltage dependent current source, a reference capacitor, a comparator, and logic circuitry. The controller estimates a primary inductance of the transformer based on a voltage across the reference capacitor, detects a saturation condition based on the estimated inductance and the primary current, and in response implements a protection mechanism. The controller may distinguish between true overload conditions and potential magnetic tampering attempts. The protection mechanism may include increasing the switching frequency. The controller may include an adjustable transconductance to set a saturation detection threshold and to implement a delay prior to activation of protection. This allows more targeted protection against core saturation and magnetic disturbances while maintaining normal operation under high load conditions.

A forward active noise reduction circuit for a gradient coil belongs to the technical field of MRI (magnetic resonance imaging) equipment and solves the problem of how to reduce electromagnetic noise in gradient coil current and improve imaging quality. An input end of an amplifier PA1 receives an input signal, an output end of the amplifier PA1 is connected with one end of a secondary side of a current transformer Tc1, and an output end of the current transformer Tc1 is connected with the other end of the secondary side of the current transformer Tc1; the other end of the secondary side of the current transformer Tc1 is connected with one end of the gradient coil, and the other end of the gradient coil is connected with the grounding end of the amplifier PA1; effective components in driving current output by the gradient power amplifier are eliminated through the subtracter, the current transformer is coupled to the gradient coil, noise components in the driving current are counteracted, electromagnetic noise generated when the gradient power amplifier drives a high load is eliminated, noise reduction and suppression are carried out on the gradient coil, and the signal purity is improved. Therefore, the imaging resolution and the system reliability are improved.

The present application provides a power system, a magnetic induction component, a magnetic induction intensity detection device, and a transformer, which can suppress the generation of inrush current. The power system includes a first switch, a transformer, a magnetic induction component, and a control circuit; a first end of the first switch is coupled to a first power source, and a second end of the first switch is coupled to an electrical load through the transformer; the magnetic induction component generates a voltage parameter under the induction of the residual magnetic induction intensity of the transformer and sends the voltage parameter to the control circuit; the voltage parameter is used for the control circuit to determine the residual magnetic induction intensity of the transformer; the control circuit determines at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer; the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the residual magnetic induction intensity; the first switch is controlled so that the initial voltage of the alternating current input to the transformer is any one of the at least one target input voltages.

The invention discloses a power dispatching optimization method and device based on a power grid state, electronic equipment and a storage medium, and belongs to the technical field of power dispatching. The method comprises the following steps: inputting local measurement data of a power grid and whole-network topological structure data into a preset power grid state estimation model; reasoning the state parameters of the whole network according to the local measurement data and the topological structure data of the whole network to obtain a voltage amplitude estimated value and a voltage phase angle estimated value of each node of the whole network, and outputting the voltage amplitude estimated value and the voltage phase angle estimated value; evaluating the current state of the power grid to obtain a power grid state evaluation result for power dispatching; wherein the loss function of the power grid state estimation model comprises a data item, a physical item and a boundary item; the physical item comprises a node current balance constraint, a node power balance constraint, an alternating current power flow equation constraint and a transformer coupling relation constraint which need to be met by model output, so that the problems of low reliability and precision of power grid state evaluation in the prior art can be solved.

The utility model belongs to the technical field of electric power engineering, and relates to a multi-signal source cascade high-efficiency power synthesis circuit based on transformer coupling, which comprises a signal generator and a plurality of broadband power amplification branches connected in parallel, each broadband power amplification branch has the same structure and comprises a signal amplifier, a coupling transformer and an impedance tuning circuit which are connected in sequence; the impedance tuning circuit adopts an L-C circuit; the output ends of the impedance tuning circuits of the broadband power amplification branches are connected in sequence, and the output ends of the impedance tuning circuits of the first broadband power amplification branch and the last broadband power amplification branch serve as the output end of the multi-signal-source cascade efficient power synthesis circuit. According to the high-power signal source output circuit, efficient synthesis of multiple paths of signals can be achieved through multi-stage amplification, and the high-power signal source output circuit is safe, simple and efficient.

A control circuit for a synchronous rectification switch of a power converter is provided. The synchronous rectification switch and a transformer of the power converter are coupled to a connection node. The control circuit includes a first logic circuit, an integrating circuit, a setting comparator, a logic gate, and a second logic circuit. The first logic circuit provides a detection signal according to a detection voltage on the connection node. The integrating circuit performs an accumulation operation on the integrated voltage value based on the detection signal to generate a setting pulse. The setting comparator provides a comparison signal according to the detection voltage and a first predetermined voltage. The logic gate outputs a setting signal according to the setting pulse and the comparison signal. The second logic circuit continuously provides a turn-on control signal in response to the setting signal. The synchronous rectification switch is turned on in response to the turn-on control signal.

A circuit for Flyback switching power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a power switch coupled to a dotted terminal of the primary winding, and a switch. A first terminal of the switch is connected to a non-dotted terminal of the auxiliary winding through a capacitor, a second terminal of the switch and a dotted terminal of the auxiliary winding are connected, respectively, to a ground. A common node of the capacitor and the auxiliary winding is configured to connect to a non-dotted terminal of the primary winding. A control circuit is configured to generate, based on a voltage at the common node of the capacitor and the auxiliary winding, a control signal to control the switch in order to achieve zero voltage switch (ZVS) of the power switch.

A charging system for an off-road electric vehicle includes a transformer coupling to connect the charging system to a power grid; a bulk charger including an input connected to the transformer coupling and a differential output to be connected to a charging load; an auxiliary (AUX) charger including an isolation transformer connected to the input of the first bulk charger and a differential output connected in parallel to the differential output of the first bulk charger. Operating the AUX charger improves the power factor of the bulk charger.

The invention relates to a converter device comprising: a primary unit with two DC voltage inputs for connecting to a fuel cell and a secondary unit with two DC voltage outputs for connecting to a consumer; wherein the primary unit and the secondary device are coupled via a transformer; wherein the transformer has a series circuit of a first primary coil (Lp1) and a second primary partial coil (Lp2) and a secondary coil (Ls), wherein a first of the DC voltage inputs is connected via a first inductance (L1) to a connection point of the first and second primary partial coil (Lp1, Lp2); wherein the primary unit comprises an inverter, the bridge points of which are connected in parallel to the series circuit of the first and second primary coil (Lp1, Lp2); wherein the secondary unit has a rectifier, the AC inputs of which are connected in parallel to a series circuit of the secondary coil (Ls) and a second inductance (L2); and wherein the AC input of the rectifier connected to the second inductance (L2) and one of the two DC outputs is connected via a resonance capacitor Cr, wherein the second inductance (L2) and the resonance capacitor Cr form a series resonance circuit.

A backward active noise reduction circuit for a gradient coil belongs to the technical field of MRI (magnetic resonance imaging) equipment and solves the problem of how to reduce electromagnetic noise in gradient coil current and improve imaging quality. One end of the gradient coil is connected with one end of a secondary side of a current transformer Tc1, and the other end of the secondary side of the current transformer Tc1 is connected with an output end of an amplifier PA1; the other end of the gradient coil is connected with the grounding end of the amplifier PA1; effective components in driving current of the gradient coil are eliminated through the subtracter, the current transformer is coupled to the output end of the gradient power amplifier, noise components in the driving current are counteracted in the output end of the power amplifier and an output loop, noise reduction and suppression are carried out on the gradient coil, and the signal purity is improved. The system is suitable for mobile and portable MRI (Magnetic Resonance Imaging) systems, and has the advantages of small size and low cost.

The invention relates to the technical field of protection equipment in a three-phase alternating-current power distribution or transmission system, in particular to a series-connection type hybrid circuit breaker applied to a three-phase alternating-current power system and a using method, and the series-connection type hybrid circuit breaker comprises a main alternating-current circuit and a circuit breaker unit connected with the main alternating-current circuit in series; the circuit breaker unit comprises a three-phase transformer, a power electron injection branch and a mechanical switch module; the power electron injection branch is connected with the three-phase transformer, and the mechanical switch module is arranged between the three-phase transformer and the main alternating current circuit. The beneficial effects of the invention are that the transformer is coupled in the main loop to induce the voltage with the polarity opposite to that of the power supply, and reverse voltage injection is realized, so that the fault current is rapidly suppressed in a microsecond level; the fault current is modulated into the high-frequency alternating-current ripple current close to zero by using the rapid mode switching of the power electronic branch, so that the action window of the mechanical switch is expanded, and the arc-free interruption is realized.