51 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.

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.

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.

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 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 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 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.

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.

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 application relates to a millimeter wave reconfigurable common-source common-gate amplifier and a reconfigurable method thereof, which comprises an input reconfigurable matching network, a common-source common-gate transistor and an output reconfigurable matching network. The millimeter wave reconfigurable common-source common-gate amplifier of the application realizes impedance and noise matching of different frequency bands by reconfiguring the capacitance value of the input matching network and the inductance value of the output matching network, and simultaneously combines a transformer coupling gain promotion structure to make different frequency bands have larger amplification gains. The millimeter wave reconfigurable common-source common-gate amplifier circuit structure and the reconfigurable method of the application are simple and suitable for use in a multi-frequency band millimeter wave transceiver system. A conventional millimeter wave amplifier works at a fixed frequency, which limits the application in a multi-frequency communication system.

This invention discloses a transformer-based noise cancellation receiver front-end circuit, including a low-noise transconductance amplifier circuit, a passive mixer, and a transimpedance amplifier. The low-noise transconductance amplifier circuit uses a cascode cascade structure, which not only achieves noise cancellation but also enables two differential current outputs. Transformer coupling at the input increases the equivalent transconductance, reducing power consumption. The baseband transimpedance amplifier uses a two-stage structure with feedforward compensation to achieve a large bandwidth. Furthermore, this receiver achieves a baseband bandwidth of 220MHz in the RF frequency range of 5.5-6.5GHz, with a noise figure below 2.45dB.

A system for generating plasma. The system including a plasma chamber configured for generating plasma, wherein the plasma chamber includes a lower electrode located within an electrostatic chuck (ESC) having a central axis in a vertical direction. The system including a split top electrode disposed above the lower electrode, wherein the split top electrode includes a main electrode and an outer electrode surrounding the main electrode in a horizontal direction referenced to the central axis. The system including a dielectric separating the main electrode and the outer electrode. The system including at least one transformer coupled plasma (TCP) coil vertically disposed over the split top electrode. The system including an edge ring surrounding the lower electrode and ESC in the horizontal direction.

The present application relates to the technical field of electronic circuits. Disclosed are a direct-current conversion circuit and a control method therefor, and an electronic device and a server. The direct-current conversion circuit comprises a switch topology module, which is configured to convert an input voltage into a target voltage on the basis of a drive signal received by a drive receiving port of the switch topology module, and which comprises a transformer, wherein a primary side of the transformer is used as an output filter inductor of the switch topology module, and when the transformer is coupled to an inductive coupling module, the equivalent inductance of the output filter inductor is reduced, so as to improve the current dynamic response of the direct-current conversion circuit; the inductive coupling module is connected to a secondary side of the transformer, receives a coupling control signal by means of a coupling control port of the inductive coupling module, and controls the inductive coupling module to couple to the transformer, so as to reduce the equivalent inductance of the output filter inductor and improve the current dynamic response of the direct-current conversion circuit; and after the direct-current conversion circuit reaches a steady state, a compensation inductor is decoupled from the primary side of the transformer, so as to reduce the ripple at an output end and improve the conversion efficiency of the direct-current conversion circuit.

A semiconductor device includes a first inductor, a second inductor and at least one varactor. The first inductor is configured to output at least one output signal. The second inductor is coupled to the first inductor with transformer coupling. The at least one varactor is coupled to the second inductor. A frequency of the at least one output signal is tuned according to the at least one varactor.

The present disclosure provides a transformer inductor, including: a primary power coil; a secondary coil positioned concentrically with respect to the primary power coil; a dielectric positioned between the primary power coil and the secondary coil to provide electrical isolation while enabling magnetic coupling therebetween; a molded magnetic material at least partially encasing the primary power coil and the secondary coil; and a hard saturation magnetic material disposed at the secondary coil and configured to provide a higher inductance at lower current levels and a reduced inductance at higher current levels, wherein the primary power coil and the secondary coil are configured to provide magnetic coupling enabling both inductive energy storage and transformer coupling.

This utility model relates to a 40.68MHz power source drive circuit, including a transformer-coupled amplifier circuit, a transformer T1, and a Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit is connected to the primary side of the transformer T1, and the secondary side of the transformer T1 is connected to the Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit amplifies the input sinusoidal signal, which is then coupled to the Class B push-pull amplifier circuit via the transformer T1, resulting in a stable 40.86MHz sinusoidal high-power voltage with low harmonic components and low parasitic noise. The compact component layout and short interconnect design reduce the area of ​​high-frequency current loops in the circuit, thereby reducing spike interference and heat generation. This utility model mounts all components on a printed circuit board and arranges them rationally, resulting in short interconnects and no crossovers. Within the 40MHz frequency range, it achieves a perfect high-power sinusoidal output, improving the reliability and stability of the circuit.

The invention provides an external passive isolation judgment circuit, which belongs to the technical field of signal detection and comprises a controller, a coupling unit, a transformer and a rectifying and filtering unit. The first end of the controller outputs a detection signal, and the detection signal is sent to the primary winding of the transformer through the coupling unit; a secondary winding of the transformer is connected to an external load; one end of the rectifying and filtering unit is connected with a primary winding of the transformer and used for detecting electrical parameter changes of the primary winding and generating feedback signals; the other end of the rectification filtering unit is connected to the second end of the controller, and the controller receives the feedback signal through the second end and judges the state of the external load. According to the invention, an external passive design is adopted, state detection is carried out through transformer coupling and by connecting the secondary side of the transformer with an external variable resistor assembly, the state detection is fed back to the primary change voltage, and the withstand voltage of strong and weak current is effectively isolated through MCU judgment, so that the circuit safety is remarkably improved, and the circuit complexity is reduced.

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

The invention belongs to the technical field of rail transit signal control, and particularly relates to an isolation switching value acquisition circuit which comprises a clock source circuit, an excitation source circuit, a first-stage amplification circuit, a second-stage amplification circuit and a third-stage output circuit, the clock source circuit outputs a square wave signal to a field effect transistor in the excitation source circuit to drive a primary excitation signal generated by a first transformer, and the primary excitation signal is coupled and amplified with a corresponding transformer through a first triode, a second triode and a third triode in sequence, and finally, the fourth transformer outputs an isolated differential switching value signal. According to the invention, a complete dynamic excitation signal chain is constructed, so that the output effectiveness completely depends on the continuous transmission of the link, a protection mechanism that the output is automatically guided to the safety side when any key device fails is realized, and meanwhile, the anti-interference capability and the driving capability of the signal are remarkably improved through the coupling and amplification of the multi-stage transformer.

A semiconductor device includes a first inductor, a second inductor and at least one varactor. The first inductor is configured to output at least one output signal. The second inductor is coupled to the first inductor with transformer coupling. The at least one varactor is coupled to the second inductor. A frequency of the at least one output signal is tuned according to the at least one varactor.

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.