16 results about "Negative inductance" patented technology

The invention provides a high-power filter based on fractional order positive and negative inductor parallel connection and a control method, and the filter comprises a fractional order negative inductor # imgabs0 # and a positive inductor # imgabs1 # which are connected in parallel. The fractional order negative inductor # imgabs2 comprises a first switch tube V1, a second switch tube V2, a third switch tube V3, a fourth switch tube V4, filter inductors L1 and L2, a filter capacitor Cf, a filter damper Rf, a grounding capacitor Cg, a sampling resistor R, a DC-DC conversion circuit, a self-powered module, an MCU controller, a digital-to-analog converter AD and a sine pulse width modulation module SPWM. According to the scheme, the inductance value and the order of the fractional-order inductor can be changed at will by changing the parameters of the MCU controller, so that the inductance value of the high-power filter with the fractional-order positive and negative inductors connected in parallel is changed, and low cost, small size, high power density and flexible and adjustable order and inductance value of the filter inductor are realized; and the method can be applied to a high-power scene with relatively high harmonic content, and a better filtering effect is achieved.

A Switched-Mode Power Supply uses a primary winding of a transformer rather than an inductor. The secondary winding of the transformer is driven with a current generated by a negative inductance circuit. When the reverse current flows it can increase the equivalent inductance value of the primary windings. A steady-state detector activates a steady signal and closes a switch to turn on the reverse current from an op amp when the output voltage remains within predetermined limits, causing the inductance to increase thus reducing ripple during steady state. When an output transient occurs, the steady signal is deactivated and the switch opened to stop the current from flowing through the transformer secondary, reducing primary inductance to allow for current to flow faster to the output to suppress the transient. Resistor and capacitor networks around the op amp allow for tuning the inductance modulation.

The application discloses a frequency and damping independently adjustable dynamic vibration absorber and a design method thereof, and relates to the technical field of semi-active control of structural vibration. The structure is composed of an inertial actuator and a shunt circuit. The shunt circuit comprises a negative inductance and negative resistance compensation circuit and an inductance-resistance-capacitance parallel circuit. Two wiring ends of a voice coil of the inertial actuator are connected with the shunt circuit to form a complete loop. The independent adjustment of the inherent frequency and the damping of the inertial actuator can be realized by adjusting the parameters of the shunt circuit. Therefore, the dynamic vibration absorber has the characteristics of controlling vibration of any disturbance frequency. The application does not need any mechanical driving device, and the inherent frequency and the damping adjustment of the dynamic vibration absorber are independent of each other.

The invention relates to the field of power electronic converter control, and discloses a high-power active variable inductor for a speed-adjustable driver and a control method thereof.The high-power active variable inductor comprises a positive inductor and a negative inductor, the positive inductor is a traditional physical inductor, and the negative inductor is obtained through equivalence of a single-phase inverter; by connecting the positive inductor and the negative inductor in parallel, the overall equivalent inductance value is increased, and meanwhile, a wider-range adjusting space is provided, so that a better filtering effect is achieved, the equivalent inductance value can be adjusted in a wide range, the power density is high, implementation is easy, three-phase imbalance can be dealt with, the electric energy quality of a speed-adjustable driver is improved, and the service life of a direct-current side filtering capacitor is prolonged; the problems that a direct-current side passive filter of an existing speed-adjustable driver is heavy, the inductance size of an active capacitor is difficult to reduce, and the adjusting range of an existing active inductor is narrow are effectively solved.

The application relates to an anti-saturation device for an electromagnetic current transformer, comprising a negative resistance circuit and a negative inductance circuit connected in series; the negative resistance circuit comprises a first resistor, a second resistor, a third resistor and a first operational amplifier, the first resistor is connected to the inverting input end of the first operational amplifier, the first resistor is also connected to the output end of the first operational amplifier, the second resistor is connected to the non-inverting input end of the first operational amplifier, the second resistor is also connected to the output end of the first operational amplifier, and the third resistor is connected to the non-inverting input end of the first operational amplifier; the negative inductance circuit comprises an inductor, a fourth resistor, a fifth resistor and a second operational amplifier, the inductor is connected to the inverting input end of the second operational amplifier, the inductor is also connected to the output end of the second operational amplifier, the fourth resistor is connected to the non-inverting input end of the second operational amplifier, the fourth resistor is also connected to the output end of the second operational amplifier, and the fifth resistor is connected to the non-inverting input end of the second operational amplifier.

A semiconductor die includes a processing circuit, a first bond pad, and a second bond pad. The first bond pad is electrically connected to a first node of the processing circuit and a first bond wire. The second bond pad is electrically connected to a second node of the processing circuit and a second bond wire. The first bond wire and the second bond wire are magnetically coupled to form a first bond wire T-coil circuit with equivalent negative inductance.

A subsynchronous oscillation suppression system disclosed by the present invention comprises a coupling transformer and a subsynchronous oscillation suppressor, a first DC power supply is connected with a power grid through a new energy power generation device, and a connection line of the new energy power generation device and the power grid is connected in series with a secondary side of the coupling transformer. The primary side of the coupling transformer is connected with the output end of the subsynchronous oscillation suppressor; the subsynchronous oscillation suppressor detects the output current of the new energy power generation equipment and judges whether subsynchronous oscillation occurs or not, if the subsynchronous oscillation occurs, the frequency of current oscillation is detected, and based on the frequency band, virtual negative inductive reactance is constructed through the coupling transformer to suppress the subsynchronous oscillation of the current; the method has the advantage that the current subsynchronous oscillation condition of new energy grid-connected power generation equipment such as a fan converter and a photovoltaic inverter can be inhibited.

The invention discloses a broadband reconfigurable Non-Foster chip, which is applied to a radio frequency microwave integrated circuit technology, is based on a Non-Foster network capable of simulating negative capacitance or negative inductance, and comprises two groups of dual-port series circuits with the same structure, the equivalence with the ideal serial negative capacitance value in the frequency bands of 2-4.5 GHz and 4.5-6 GHz is realized respectively; a single-pole double-throw switch is used for switching a used dual-port series circuit, and a varactor is switched to control voltage so as to adjust an equivalent capacitance value, so that within the working frequency of 2GHz-6GHz, the equivalent capacitance value of the designed circuit is-1pF, the reconfigurable range of the capacitance value is as follows:-1pF is greater than or equal to 15%, and the capacitance value error of the circuit is less than or equal to 10% when the circuit is equivalent to a capacitor with a fixed value of-1pF.

Embodiments of this disclosure provide a logic control circuit for a DC-DC converter and a DC-DC converter. The DC-DC converter includes a bootstrap capacitor, a power transistor, and a freewheeling transistor. A first terminal of the bootstrap capacitor is coupled to a first terminal of the power transistor. A second terminal of the bootstrap capacitor is coupled to a bootstrap node. The logic control circuit includes a trigger circuit, a forced turn-off time control circuit, and a reset circuit. The trigger circuit is configured to generate a trigger signal based on a PWM signal from the DC-DC converter and a negative inductor current indication signal. The forced turn-off time control circuit is configured to generate a freewheeling transistor forced turn-off signal based on the trigger signal. During the period when the freewheeling transistor forced turn-off signal is at an active level, the freewheeling transistor is forcibly turned off. The reset circuit is configured to generate a reset signal based on the voltage difference between the bootstrap node and the first terminal of the power transistor, a reference voltage, and the freewheeling transistor forced turn-off signal. The reset signal is provided to the trigger circuit to reset the trigger signal to an inactive level.

The present invention provides a high-power filter based on the parallel connection of fractional-order positive and negative inductors and a control method. The filter includes a fractional-order negative inductor #imgabs0# and a positive inductor #imgabs1#, which are in a parallel relationship. The fractional-order negative inductor #imgabs2# includes a first switching tube V1, a second switching tube V2, a third switching tube V3, a fourth switching tube V4, filter inductors L1 and L2, a filter capacitor C f , a filter damping R f , a grounding capacitor C g , a sampling resistor R, a DC-DC conversion circuit, a self-power supply module, an MCU controller, a digital-to-analog converter AD, and a sine pulse width modulation module SPWM. By changing the parameters of the MCU controller in the solution of the present invention, the inductance value and order of the fractional-order inductor can be arbitrarily changed, so as to change the inductance value of the high-power filter with the parallel connection of fractional-order positive and negative inductors, realizing the low cost, small volume, high power density of the filter inductor, and the flexibility of adjustable order and inductance value. It can be applied to high-power scenarios with high harmonic content and achieve better filtering effects.

The application discloses a kind of subsynchronous oscillation suppression systems, including coupling transformer and subsynchronous oscillation suppressor, first DC power supply is connected with power grid through new energy power generation equipment, new energy power generation equipment and the connecting line of power grid are connected with the secondary side of coupling transformer in series, the primary side of coupling transformer is connected with the output end of subsynchronous oscillation suppressor;Subsynchronous oscillation suppressor detects the output current of new energy power generation equipment, judge whether there is subsynchronous oscillation, if there is subsynchronous oscillation, the frequency of current oscillation is detected, and based on the frequency band, virtual negative inductance is constructed by coupling transformer to suppress current subsynchronous oscillation;The application has the advantages that: it can suppress the current subsynchronous oscillation of wind turbine converter, photovoltaic inverter and other new energy grid-connected power generation equipment.

The application provides a PT symmetric system based on a negative impedance transformer and an energy efficiency and distance improvement method thereof, and is characterized in that: at least one negative impedance transformer is connected in series on a wireless power transmission loop, the negative impedance transformer is constructed based on a transformer and an operational amplifier, wherein: the transformer considers leakage inductance and magnetizing inductance, a primary winding of the transformer is connected in series in the transmission loop, one end of a secondary winding of the transformer is grounded, and the other end is connected to an inverting input terminal of the operational amplifier, and the operational amplifier is equivalent to a negative resistance module or a negative inductance module by configuring a resistance element or / and an inductance element on a corresponding branch. The effect is that: the flexible adjustment of the inductance ratio is realized by constructing a negative inductance on the primary side, the power extreme point is accurately approached, and the output current is optimized in combination with the primary side compensation negative resistance, so that the problem of small power is solved from the core parameter level.

The invention relates to the field of power electronic converter control, discloses an ASD complex working condition management method and system based on a high-power active adjustable inductor, and aims to solve the problems of poor dynamic performance and short device service life caused by fixed passive filtering parameters of the ASD under the complex working conditions of three-phase imbalance, load switching, underload, overload and the like. According to the embodiment, an active variable inductor in which a positive inductor (such as a traditional physical inductor) and a negative inductor (equivalent to a single-phase inverter) are connected in parallel is adopted; the working condition state of the ASD at the current moment is recognized, then the negative inductance value is adjusted in a targeted mode, different working conditions are adapted, and the optimal filtering effect is achieved. The management method provided by the embodiment of the invention can flexibly deal with complex working conditions, improve the filtering performance, inhibit the DC side voltage fluctuation, prolong the service life of the capacitor, and improve the ASD power density and the operation reliability at the same time.

This invention discloses an adaptive virtual impedance optimization method and system, belonging to the field of power quality improvement technology. The method is executed by the VSG control module and includes: acquiring the system power angle and reactive power; outputting a fitted virtual resistance using a reactive power-virtual resistance regulator combined with a polynomial fitting curve method; real-time detection of the magnitude margin of the active power open-loop transfer function at the synchronous frequency; and selecting the output mode based on the margin detection result: if the margin meets the requirements, the fitted virtual resistance is used; if the margin is insufficient, a virtual negative inductor is engaged to reduce the power angle, and the system switches to directly outputting the virtual resistance by the reactive power-virtual resistance regulator. This invention, through an adaptive switching control strategy, effectively solves the problem of system instability caused by power coupling and synchronous frequency resonance in existing VSG control at large power angles, achieving power decoupling and SFR suppression over a wide range of power angles.

A switch-mode power supply uses the primary winding of a transformer instead of an inductor. The secondary winding of the transformer is driven by a current generated by a negative inductance circuit. When a reverse current flows, it increases the equivalent inductance of the primary winding. When the output voltage is maintained within predetermined limits, a steady-state detector activates a steady-state signal and closes a switch to allow reverse current to flow from the operational amplifier, increasing the inductance and reducing ripple during steady-state operation. When a transient output change occurs, the steady-state signal is deactivated, the switch opens, and current flows through the transformer secondary winding, reducing the primary inductance and allowing current to flow to the output more quickly to suppress the transient. A network of resistors and capacitors around the operational amplifier can be used to adjust the inductance modulation.