73 results about "Transformer coupling" patented technology

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.

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 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 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.

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.

A transformer includes a primary coil and a secondary coil. The primary coil includes: a first shield of a first coaxial cable; a second shield of a second coaxial cable; and a conductive interconnect connecting the first shield to the second shield. The secondary coil includes: a first core of the first coaxial cable; a second core of the second coaxial cable; and a pair of wires connecting the first core to the second core.

The invention relates to the monitoring of an electrical current in a power converter, for example, a DC-DC converter. For this purpose, a transformer is provided, which is coupled into a current path of the power converter on the primary side. Sensor signals corresponding to the mean value and / or a peak value of the current flow to be monitored can be provided on the secondary side of this transformer. For this purpose, an electrical connection between the secondary side of the transformer and the sensor signal outputs is opened when the primary side of the transformer is not energized. During these time intervals, the transformer can be demagnetized to compensate for a DC voltage offset in the current to be monitored.

A semiconductor device includes a first transistor, a second transistor, a first inductor and a second inductor. A control terminal of the first transistor is configured to receive an input signal. The second transistor is coupled in series with the first transistor, a first terminal of the second transistor being configured to receive the input signal at a first node. The first inductor is coupled between first transistor and the first node. The second inductor is coupled to a control terminal of the second transistor. The first inductor and the second inductor are mutually coupled to each other with transformer coupling.

The invention discloses a semiconductor device and an operation method thereof. The semiconductor device comprises a first inductor, a second inductor and at least one variable capacitor. The first inductor is used for outputting at least one output signal. The second inductor is coupled to the first inductor by transformer coupling. The at least one varactor is coupled to the second inductor. The frequency of the at least one output signal is tuned according to the at least one varactor.

This invention provides an on-chip transformer-coupled differential single-pole double-throw switch circuit and an RF integrated circuit, belonging to the field of RF integrated circuits. The differential common port is coupled to the first differential throw ports L_P and L_N, and the second differential throw ports R_P and R_N, respectively. The first switch network includes switch elements D1 and D2, with the anodes of D1 and D2 connected to L_N and L_P, respectively. The cathodes of D1 and D2 are connected together and then connected to the output of a first CMOS inverter. The input of the first CMOS inverter is the input signal SW_L. The second switch network includes switch elements D3 and D4, with the anodes of D3 and D4 connected to R_N and R_P, respectively. The cathodes of D3 and D4 are connected together and then connected to the output of a second CMOS inverter. The input of the second CMOS inverter is the input signal SW_R. This invention solves the problems of limited switching linearity, high insertion loss, insufficient isolation, and large chip area.

A power supply device includes a transformer, a primary circuit, a secondary circuit, and a mode control unit. The transformer is coupled between the primary circuit and the secondary circuit. The primary circuit includes two rectifying switches. The secondary circuit includes a mode switching switch. The mode control unit is coupled between one of the two rectifying switches and the mode switching switch to control the mode switching switch to be turned on or off based on a switching state of the coupled rectifying switch. When the power supply device operates in a first operating mode, the mode switching switch is synchronized with the lower arm switch, and the power supply device outputs a first voltage. When the power supply device operates in a second operating mode, the mode switching switch is turned on, and the power supply device outputs a second voltage higher than the first voltage.

Inductive proximity switch with an oscillator (1) and a transmitting coil (2) for generating an alternating magnetic field that can be influenced by a target (11), a receiving coil pair (3) that is transformer-coupled to the transmitting coil (2) for evaluating the alternating magnetic field that can be influenced by the target (11), a balancing winding (4) for balancing the differential signal of the receiving coil pair (3), and a control unit (5) for outputting a binary switching signal, characterized in that the receiving coil pair (3) is connected to a biased differential rectifier (6) for phase-insensitive rectification, and a differential integrator (7) is provided for comparing the received signals of the receiving coil pair (3), the binary switching signal being the result of the evaluation of the transformer-type coupling factor between the transmitting coil (2) and the receiving coil pair (3).