538 results about "Output impedance" patented technology

The invention relates to the technical field of power system stability control, in particular to a broadband oscillation suppression method and system for an offshore wind power flexible direct current grid-connected system and a medium, and the method comprises the steps: sequentially injecting positive and negative sequence perturbation sine harmonic signals at a grid-connected point of a wind turbine generator, constructing a multi-input multi-output impedance matrix, reducing the order of the multi-input and multi-output impedance matrix into single-input and single-output equivalent positive sequence impedance; the stability margin of the offshore wind power flexible direct current grid-connected system is obtained based on equivalent positive sequence impedance quantification; when the stability margin is lower than a preset margin threshold value, reconstructing the fan grid-side converter into a matrix control structure by cascading a weighting coefficient matrix between the inner and outer ring control loops of the fan grid-side converter; and iteratively optimizing the matrix type control structure based on impedance sensitivity, and synchronously connecting a low-pass filter in series in a voltage and current feedback channel to carry out impedance remodeling so as to finish broadband oscillation risk suppression. According to the invention, broadband oscillation suppression of the offshore wind power flexible direct current grid-connected system is realized through impedance modeling and a matrix type control strategy.

The invention relates to a weak current cable fault positioning method and system, and the method comprises the steps: preliminarily locking a fault region through monitoring the axial stress change in real time, injecting a low-frequency pulse signal in a target section, analyzing the reflection waveform characteristics, and extracting the waveform distortion characteristics in a reflection signal; dynamically adjusting the output impedance based on the amplitude attenuation and time delay relationship, and if the dynamically adjusted output impedance cannot enable the output impedance of the injected low-frequency pulse signal to be synchronous with the impedance change trend of the cable, marking as an impedance mismatch point; after an impedance mismatch point is identified, other interferences are eliminated through multi-band signal attenuation difference analysis, and the position of a fault point is determined; the system is used for implementing the method. According to the method and system, stress monitoring and electric signal detection are combined, the detection range is remarkably shortened, the positioning precision and the detection accuracy are improved, and the method and system are suitable for weak current cable fault diagnosis in a complex environment.

The invention discloses a column type distribution transformer winding abnormity detection system and detection method. The detection system comprises a frequency response detection instrument, a signal coupling assembly, an impedance matching module and a data processing module. The frequency response detection instrument is used for outputting a frequency sweep excitation signal and collecting a winding response signal; the signal coupling assembly is used for isolating power frequency voltage and filtering low-frequency interference; the impedance matching module is used for adjusting output impedance and input impedance to realize matching with electrical characteristics of different windings; and the data processing module is used for constructing an equivalent detection loop model, completing frequency response simulation calculation and carrying out frequency domain analysis and anomaly identification on an actually measured response curve. According to the invention, electrified state diagnosis of distribution transformer winding structure abnormity (such as deformation and loosening) can be realized.

The invention discloses a wind power system composite oscillation suppression strategy and system based on a static synchronous compensator, and the strategy comprises the steps: firstly constructing a sequence impedance model of a GFM-STATCOM and an equivalent wind turbine generator (EWTG) based on a wind power output system containing the GFM-STATCOM; combining the impedance contribution degree beta, analyzing the interaction between the two, and determining the oscillation risk dominant factor of the sub / super-synchronous frequency band; and finally, performing frequency-band suppression: aiming at the problem of negative damping dominance of the subsynchronous frequency band GFM-STATCOM, adopting a control parameter optimization strategy based on parameter sensitivity, and reducing a reactive loop integral coefficient by increasing virtual resistance so as to reduce a negative damping range. In order to solve the problem of negative damping leading of a super-synchronous frequency band EWTG, a virtual admittance control strategy based on voltage feedforward is adopted to reduce the output impedance amplitude of a GFM-STATCOM, the leading position of positive damping of the GFM-STATCOM is enhanced, and then the negative damping of the system is eliminated. According to the invention, precise suppression of composite oscillation is realized, and the stability of a wind power sending system under a weak power grid is improved.

The invention provides a grid-connected inverter impedance detection method based on an L-shaped filter, and belongs to the technical field of grid-connected inverter impedance detection. A multi-frequency-point disturbance signal is injected into a preset grid-connected inverter working point, time domain data of inverter side current and common coupling point voltage are collected, fast Fourier transform analysis is carried out on the collected data, amplitude and phase information corresponding to each injection frequency point is extracted, and a frequency domain feature vector matrix is established; and establishing a frequency compensation matrix model to compensate and correct high-frequency band measurement data based on a frequency characteristic attenuation vector, calculating to obtain optimal estimated values of power grid impedance and grid-connected inverter output impedance, performing error analysis and precision verification on an impedance detection result, and outputting a verified impedance parameter value. The technical problem of insufficient power grid impedance detection precision caused by high-frequency band attenuation of the L-shaped filter is solved.

The invention relates to the technical field of self-synchronizing voltage source control, and discloses a balance current controlled self-synchronizing voltage source control method and system. The method comprises the following steps: acquiring and preprocessing operation data of a grid-connected inverter to obtain active / reactive components of voltage and current of a filter element; generating a three-phase terminal voltage instruction of the self-synchronizing voltage source based on the components, and determining a current instruction signal in combination with the grid-connected voltage; a three-phase modulation signal is generated through adjustment of a PIR controller and coordinate inverse transformation, then a filter inductance value is calculated according to the ripple characteristic of the modulation signal and a switching period, a filter capacitance value is determined by combining resonant frequency, and finally accurate control of the self-synchronizing voltage source is realized according to a filter parameter. By dynamically calculating the matching parameters of the filter inductance and the filter capacitance, the active regulation and control capability of the output impedance characteristic of the inverter is enhanced, and the resonance risk during the impedance change of the power grid is effectively inhibited. The technical problem that the stability is limited due to insufficient impedance regulation and control in the prior art is solved.

The invention relates to the technical field of circuit board conductivity detection, and discloses a circuit board conductivity detection method and system based on deep learning, and the method comprises the steps: obtaining high-resolution image data and circuit design parameters of a to-be-detected circuit board, and generating a circuit board feature data set; calculating theoretical impedance distribution of each area of the circuit board by using a physical constraint neural network based on the circuit board feature data set, and outputting an impedance prediction parameter set; inputting the impedance prediction parameter set and the circuit symbol rule into a neural symbol inference device to generate a conductance fault diagnosis result; and obtaining diagnosis results of a plurality of detection sites, executing cross-site diagnosis fusion, and outputting a unified circuit board conductivity detection report. The method overcomes the limitation that a traditional visual detection method cannot identify electrical characteristic defects, and solves the detection problem of hidden faults such as discontinuous impedance of the high-frequency circuit board.

The invention discloses a composite impedance remolding stability improving method based on power grid voltage feedforward, and the method comprises the steps: connecting a low-pass filter in series in a power grid voltage proportion feedforward link, maintaining the power grid voltage feedforward low-frequency harmonic suppression capability, and improving the phase margin of the output impedance of an inverter in a middle-high frequency band at the same time. And a power grid voltage feed-forward branch for eliminating the negative damping influence of the phase-locked loop is added to a public grid-connected point, so that the stability of the grid-connected inverter is improved, the phase margin of the system is greatly improved, and the grid-connected inverter can still keep higher robust stability when the impedance of the power grid is higher. The stability of the grid-connected inverter is improved when the impedance of the power grid changes in a wide range, the quality of grid-connected current is improved, and the problem that the system is faced with instability after the influence of power grid voltage feedforward and PLL is considered under a weak power grid is effectively solved.

The present application discloses a method, apparatus, device and storage medium for cross-correlated harmonic control in power grids. The method includes: performing wavelet packet decomposition on subnet electrical signals to obtain the harmonic components of the subnet in each frequency band; calculating the harmonic phase difference between subnets based on the cross-correlation function and topological impedance matrix between the harmonic components of each subnet, and calculating the total harmonic distortion rate based on the harmonic components of the subnet in each frequency band; constructing a harmonic transfer equation based on the harmonic phase difference between subnets and the equivalent output impedance of the inverter to calculate the harmonic responsibility ratio of the subnet; solving a two-layer game model based on the total harmonic distortion rate and its reference value and the harmonic responsibility ratio of the subnet to obtain the output of the control equipment; inputting the output of the control equipment into the fuzzy controller to obtain the impedance adjustment amount of the subnet, and adjusting the virtual impedance according to the impedance adjustment amount to update the harmonic return path. The present application realizes the harmonic control between multiple subnets during high-penetration distributed grid connection, thereby improving the stability of power grid operation.

The invention discloses a network construction converter virtual impedance and power reference cooperative adjustment method and system, and relates to the technical field of power control, a virtual synchronous generator system introduces virtual impedance to increase equivalent output impedance of an inverter, and an internal voltage reference generated by a virtual synchronous generator algorithm of the inverter is monitored in real time; monitoring the local voltage measured by the common coupling point in real time; based on the vector difference between the internal voltage reference and the local voltage, the accurate amplitude of the virtual impedance is solved in real time by combining the maximum current limit value of the power electronic device; and determining a function relationship between an active power reference value and reactive power based on the accurate amplitude of the virtual impedance, monitoring the reactive power measured at the common coupling point in real time, and adjusting the active power reference value according to the function relationship to keep a stable balance point. And virtual impedance is dynamically calculated to accurately limit current, and active power reference is adaptively adjusted according to real-time reactive response, so that maximized power grid support and safe and stable operation of the converter are realized.

The present application discloses a low-cost and high-performance radio-frequency amplifier, comprising an input stage circuit, a common-gate stage circuit, and an output load circuit. The input stage circuit implements conversion from a single-ended signal to a differential signal, implements input impedance matching, and converts an inputted radio-frequency voltage signal into a radio-frequency current signal. The input stage circuit comprises a first three-coil transformer, consisting of a primary coil, a secondary coil, and a third coil. The common-gate stage circuit transmits the radio-frequency current signal outputted by the input stage circuit to the output load circuit, increases the withstand voltage and equivalent output impedance of the circuit, and implements gain control in at least two modes. The output load circuit converts the radio-frequency current signal from the common-gate stage circuit into a radio-frequency voltage signal, implements conversion from a differential signal to a single-ended signal, and outputs an amplified radio-frequency voltage signal. The present application provides a radio-frequency amplifier having a small size, broadband matching, high linearity, a large dynamic range, and low design complexity.

Systems and methods that charge a battery using a signal with at least one harmonically tuned aspect based on impedance of the battery with a frequency or harmonic component. The system may further involve a power converter that may act in concert with charging to power a load. In some instances, an output signal is generated that is interleaved with the charge signal. Further, the output signal may be tuned based on output impedance to the discharge signal.

The invention provides an output impedance calibration method and circuit and an integrated circuit product, and relates to the technical field of integrated circuits. The method comprises: in response to conduction of a first branch in a plurality of parallel branches, determining a first output impedance of a product to be tested, the first output impedance comprising a first resistance of the first branch and a first contact resistance caused by a probe test; in response to conduction of a second branch in the plurality of parallel branches, second output impedance of the to-be-tested product is determined, the second output impedance comprises a second resistor of the second branch and a first contact resistor caused by probe testing, and the resistance value of the second resistor is different from that of the first resistor; a first contact resistance is determined from the first output impedance and the second output impedance. According to the scheme, the calibration precision of the output impedance can be improved.

The invention provides a stability margin calculation method of a new energy station grid-connected system, a terminal and a storage medium. The method comprises the following steps: acquiring inverter output impedance and power grid side equivalent impedance of an initial new energy station grid-connected system under multiple working conditions; taking the ratio of the output impedance of the inverter to the equivalent impedance of the power grid side under the same working condition as an open-loop transfer function, and determining a gain margin and a phase margin of the new energy station grid-connected system under each working condition based on the open-loop transfer function under each working condition; determining the weakest working condition of the new energy station grid-connected system based on the gain margin and the phase margin of the new energy station grid-connected system under each working condition; and under the weakest working condition, based on the gain margin and the phase margin of the new energy station grid-connected system under different numbers of inverters connected in parallel, the maximum capacity expansion number is determined. According to the method, accurate quantification of the capacity expansion limit is realized, the system stability is ensured, and the capacity expansion potential of the station is fully excavated.

The embodiment of the invention discloses a cable defect positioning and defect aging state detection method and equipment, belongs to the technical field of cable defect detection, and solves the problem that cable defects are difficult to reliably position during cable defect diagnosis in the prior art. Comprising the steps of constructing an integral transformation kernel function based on cable initial characteristic parameters; based on the integral transformation kernel function, constructing an integral transformation function corresponding to the cable head end impedance spectrum data, obtaining a cable defect diagnosis function, and determining cable defect positioning information through the cable defect diagnosis function; inputting the obtained cable defect positioning information into a cable impedance spectrum calculation model containing a local defect section, and outputting an impedance spectrum calculation value; optimizing a difference value objective function corresponding to the impedance spectrum calculation value and the impedance spectrum measurement value through a particle swarm algorithm to obtain characteristic parameters of the defect section of the cable; and determining the aging state of the local defect of the cable based on a preset cable aging characteristic parameter threshold and the characteristic parameters of the defect section of the cable.

The invention provides a millimeter wave digital power amplifier based on a serial transmission line balun synthesis network, and belongs to the technical field of millimeter wave digital power amplifiers. According to the millimeter wave digital power amplifier, firstly, a driving power distribution network based on a bridge and a transformer is adopted, and radio frequency power is subjected to differential conversion and then input into a digital power amplifier unit array; secondly, the digital power amplifier unit adopts a differential Cascode structure with a neutralizing capacitor, so that the gain and the output impedance of the digital power amplifier unit can be effectively improved; finally, a synthesis network based on a series transmission line balun is adopted, the synthesis network can realize active load modulation optimization of the digital power amplifier, the impedance matching condition of the digital power amplifier under the maximum and partial rollback output power levels is improved and balanced, and the overall efficiency is improved.

The invention discloses a radio frequency power amplifier, a radio frequency power amplifier module and a radio frequency power amplifier module, and the radio frequency power amplifier comprises a four-stage power amplifier structure which is used for amplifying an input signal to preset output power; the inter-stage matching network is used for completing impedance matching between the output impedance of each stage of array and the output impedance of the rear-stage array and impedance matching between the input impedance of each stage of array and the output impedance of the front-stage array through an impedance matching technology; the protection circuit comprises a temperature protection unit and a standing-wave ratio protection unit. The temperature protection unit is used for monitoring the temperature of the GaN power amplifier unit in each array in real time and comparing the temperature with a preset temperature, and generating a logic instruction for cutting off the power supply of the corresponding array when the number of overtemperature units is judged to be greater than a preset number; the standing-wave ratio protection unit is used for detecting the output standing-wave ratio and generating a logic instruction for switching power supply when it is judged that the detected standing-wave ratio is larger than a preset ratio. According to the invention, high-performance communication requirements and simple and effective exception protection can be met.

Provided is a buffer circuit that can realize a wide dynamic range, a reduced area, and a reduced power consumption amount while maintaining low output impedance. The buffer circuit includes a first transistor, a current source, a second transistor, an output terminal, and first and second capacitors. The first transistor has a gate to which an input signal is input. The current source is connected to one terminal of the first transistor. The second transistor is connected to the other terminal of the first transistor. The output terminal is connected to the one terminal or the other terminal of the first transistor. The first and second capacitors are between the current source and the gate of the second transistor. The first transistor, the second transistor, and the first capacitor form a first feedback circuit. The first transistor, the current source, and the second capacitor form a second feedback circuit.

The invention discloses a network construction converter equivalent sequence impedance modeling method considering frequency coupling and time delay, and belongs to the technical field of power electronics. The network construction converter equivalent sequence impedance modeling method can accurately establish a complete and comprehensive network construction converter equivalent sequence impedance model with clear physical significance; and a basis for improving broadband interaction stability problem analysis and impedance matching optimization of the power grid is provided. Based on the model, the application of the network construction type converter in the micro-grid is promoted, the influence characteristic of digital delay on the output impedance of the converter is determined, and a theoretical basis is provided for optimizing the high-frequency stability of the network construction converter. The method can be applied to various scenes such as new energy power generation grid connection, distributed power supply access and a micro-grid, and provides technical support and a solution for stable operation of a modern power system.

The invention provides a distributed photovoltaic grid-connected converter low-voltage ride-through control method based on sum-difference coordinate transformation, and solves the problems of insufficient synchronism, poor stability, insufficient reactive power support potential excavation and the like existing in collaborative response under power grid voltage drop during distributed photovoltaic grid connection. According to the method, impedance modeling and equivalent symmetry transformation are carried out on the distributed photovoltaic inverter, and a coupling multi-dimensional matrix equation is established; an original coupling system is decoupled into a sum current channel and a plurality of difference current channels, the control complexity is simplified, and an open-loop output impedance expression and a closed-loop output impedance expression are deduced; secondly, formulating a refined active / reactive current collaborative distribution strategy for different voltage drop depths, dynamically calculating the minimum reactive current during voltage drop, preferentially meeting the national standard, and maximizing active output or balancing loss under the limit of rated current; and finally, through sum-difference coordinate transformation, the total current demand and distribution are efficiently decoupled and issued to a current loop controller of each inverter, so that rapid, synchronous and stable cooperative operation of multiple inverters is realized.

The invention discloses a dual-frequency positive-sequence impedance modeling method for a network-building type energy storage converter considering frequency coupling. The method comprises the following steps: 1, injecting a dual-frequency positive-sequence disturbance voltage signal at a grid-connected point of the network-building type energy storage converter based on a virtual synchronous machine; 2, establishing a linearized small signal model for each control link of an active-frequency loop, a reactive-voltage loop, a virtual impedance-containing voltage and current double closed loop and the like to form a multi-frequency signal model; and 3, according to the multi-frequency coupling relationship between the current and the voltage, constructing a frequency coupling impedance matrix, and reducing a coupling term into output impedance to obtain the positive sequence output impedance and the negative sequence output impedance of the converter considering the frequency coupling, thereby simplifying the model stability analysis. According to the method, dual-frequency positive sequence disturbance is introduced, the coupling effect between different frequency components is effectively described, the defect that a traditional single-frequency modeling method cannot reflect the multi-frequency interaction characteristic is overcome, and the accuracy and applicability of the impedance model of the network construction type energy storage converter under the multi-frequency disturbance scene are remarkably improved.

The invention discloses an impedance-invariant vector synthesis phase shifter, an array element and a phased array, and relates to the technical field of phased array design. According to the impedance-invariant vector synthesis phase shifter provided by the invention, two capacitive compensation branches are arranged in each Gilbert unit of a variable gain amplifier, and the capacitive compensation branches are connected to a circuit only when bits are turned off, so that the output impedance of the unit is kept unchanged when the bits are turned on and turned off, and the output impedance of the unit is not changed when the bits are turned off. The phase shifting precision of the phase shifter is effectively improved, the root mean square phase error of the phase shifter is reduced to be within the acceptable range of the engineering field, phase shifting is directly carried out according to the most ideal condition based on IQ orthogonal signals, complicated calibration work is avoided, and the calibration problem of the vector synthesis phase shifter is solved. The invention further provides an array element which adopts the impedance-invariant vector synthesis phase shifter, the continuous time linear equalizer and the current mode attenuator and has the advantage of being convenient to deploy.

The invention discloses an automatic frequency modulation energy storage control method and system based on PCS power regulation, and belongs to the technical field of power system automation control, and the method comprises the steps: obtaining a voltage sampling sequence and a current sampling sequence of a PCS AC side port, and calculating a power grid side fundamental frequency equivalent impedance initial value; a preset high-frequency disturbance signal is injected into the PCS power output end, the fundamental frequency equivalent impedance initial value of the power grid side is corrected, and a real-time power grid impedance parameter is obtained; determining a target adaptive gain coefficient from a preset gain mapping table according to the combination of the real-time power grid impedance parameter and a preset virtual output impedance parameter; inputting the power grid frequency deviation value and the target adaptive gain coefficient into a frequency modulation power calculation function to obtain a PCS target active power regulation quantity; inputting the PCS target active power adjusting quantity into a PCS power control loop, and controlling the PCS to output AC side active power equal to the PCS target active power adjusting quantity; according to the invention, the frequency modulation response precision is improved.

The present invention discloses an adaptive underwater low-frequency underwater acoustic transducer impedance matching device, which comprises a main control circuit, which sends a sweep frequency signal to an underwater power amplifier in a configuration stage and performs impedance matching calculation according to an electrical signal collected by an impedance detection circuit; in an adaptive operation stage, calculates an expected sound source response curve according to the transmitting power of the underwater power amplifier, obtains a power deviation in combination with the sound source signal collected by a hydrophone, obtains an impedance angle according to the electrical signal collected by the impedance detection circuit, and then performs impedance matching modification; an impedance array circuit realizes a circuit with adjustable inductance and inductance parameters to output the maximum power of the underwater acoustic transducer; in the configuration stage, the impedance detection circuit collects electrical signals of the impedance array circuit at various frequency points and transmits them to the main control circuit; in the adaptive operation stage, the electrical signals of the transmitting frequency points are collected and transmitted to the main control circuit; and an impedance switching circuit selectively connects the capacitors and inductors in the impedance array circuit by a relay according to the matching impedance of the main control circuit.

An apparatus is provided that includes a memory array including non-volatile memory cells configured to store weights of an artificial neural network, a bit line coupled to a plurality of the non-volatile memory cells, and an interface circuit coupled to the bit line, the interface circuit configured to amplify an output impedance of the memory array.

The invention discloses an oscillation suppression method and system for a grid following and grid constructing inverter hybrid system, and the method comprises the steps: building a grid following inverter decomposition model, and separating a negative damping component which causes the instability of a grid following inverter; and designing a compensation item based on the negative damping component, injecting the compensation item into the grid-forming inverter, and remodeling the output impedance of the grid-forming inverter to offset the influence of the negative damping component of the grid-forming inverter on the system stability. The negation of the negative damping component is carried out and then the negation is injected into the grid-forming inverter, and the compensation item of the output impedance of the grid-forming inverter can be calculated, so that the influence of the negative damping component of the grid-forming inverter on the stability of the system is counteracted.

The invention discloses a power supply modular combination method and system based on a standardized interface. The method comprises the following steps: step 1, collecting data through a sensor; 2, the central control hub fuses data and establishes a four-dimensional collaborative model; 3, the MOSFET driving circuit carries out adjustment according to a control instruction of the central control hub; and 4, the AI prediction current sharing module predicts the load change trend of the current power supply system and the performance degradation condition of each module through a built-in machine learning model, and dynamically adjusts the current distribution of each module based on the prediction result in combination with a target current value in an instruction, thereby realizing the current distribution of the power supply system. The system comprises a central control hub, a sensor unit, an AI prediction current sharing module and an MOSFET drive circuit. The method has the advantages that dynamic impedance matching and current sharing control closed loop are achieved, AI prediction current sharing is achieved through a machine learning model, output impedance and current distribution of a power module are accurately controlled, load changes are dynamically adapted, and current sharing precision and system stability are improved.

A broadband Doherty power amplifier is provided, which includes a power divider, a carrier power amplifier circuit, a peak power amplifier circuit, and a load modulation network. The carrier power amplifier circuit includes a carrier input matching circuit, a carrier power amplifier, and a carrier output matching circuit. The peak power amplifier circuit includes a peak input matching circuit, a peak power amplifier and a peak output matching circuit. A resistance value of a system load is ZL. An output impedance of the carrier output matching circuit is Zm and meets Zm=ZL(n+1). An output impedance of the peak output matching circuit is Zp and meets Zp=ZL(n+1) / n. The load modulation network is configured to set an impedance of a combination point to be ZQ, whose resistance value is ZL. A method of implementing a broadband Doherty power amplifier is further provided.

The invention provides a gain-reconfigurable active phase shifter with a low phase error, and relates to the technical field of phase shifters, and the phase shifter comprises a quadrature coupler which converts a radio frequency input signal into a shunt radio frequency signal; the input matching Balun converts the shunt radio frequency signal into a shunt differential signal; the digital control signal received by the phase inversion variable gain amplifier is used for controlling the on-off state of a differential pair in each differential group, and determining a differential combination current corresponding to a differential pair combination in a conduction state based on a shunt differential signal corresponding to each differential pair; the differential combination current is used for representing a gain state corresponding to the differential pair combination; the input impedance and the output impedance of the phase inversion variable gain amplifier in different gain states are kept unchanged; the vector synthesis module determines a phase shift differential signal based on the differential combined current; the output matching Balun converts the phase shift differential signal into a radio frequency output signal. The antenna has a wide gain adjustable range and a low phase error.

A circuit arrangement for current limiting and an electrical system comprising such a circuit arrangement. An output terminal of a current limiting control circuit is connected to a control input of a semiconductor switch via a limiting resistor (RB). The current limiting control circuit is configured to change an output impedance of the current limiting control circuit at the output terminal. The semiconductor switch is configured to set a current (I) in a circuit between an electrical power source and a load. An inductor (L) is configured to be connected to the electrical power source and to a terminal of the load and an input of the current limiting control circuit is connected to the inductor (L). The current limiting control circuit is configured to detect an overcurrent-related voltage drop (VL) of the inductor (L) and reduce its output impedance to increase an output impedance of the semiconductor switch.