297 results about "Current regulator" patented technology

The present disclosure provides a motor drive integrated on-board charger to reduce the quantity of components in an electric system of an electric vehicle. Reduction of components is achieved by utilizing the motor and the motor driving inverter as a part of the on-board charger in the charging mode. By controlling relays, electrical connections of the system may be reconfigured according to its mode of operation. In one aspect, the motor and the motor driving inverter play the roles of a boost PFC, a current regulator, or both.

System and method for controlling one or more light emitting diodes. For example, the system includes: a current regulator including a first regulator terminal and a second regulator terminal, the first regulator terminal being configured to receive a diode current flowing through the one or more light emitting diodes, the current regulator being configured to generate a sensing signal representing the diode current, the second regulator terminal being configured to output the sensing signal; a bleeder controller including a first controller terminal and a second controller terminal, the first controller terminal being configured to receive the sensing signal from the second regulator terminal, the bleeder controller being configured to generate a first bleeder control signal based at least in part on the sensing signal, the second controller terminal being configured to output the first bleeder control signal.

The invention discloses a cascaded SVG-based grid-connected system high-frequency oscillation suppression method and system in a weak network state. The method comprises the following steps: generating a preliminary modulation current component by using a capacitor voltage signal of an SVG device; enabling a voltage signal of a grid-connected point to pass through a fundamental frequency wave trap, obtaining an oscillation voltage component of a grid side except a fundamental frequency, and generating a high-frequency oscillation suppression current component based on the oscillation voltage component; generating a reactive current component compensation component based on the grid-connected point voltage signal, the cascade SVG device output current signal and the grid-side current signal; adding the preliminary modulation current component, the high-frequency oscillation suppression current component and the reactive current component compensation component to obtain a cascade SVG compensation current reference value, making a difference between the cascade SVG compensation current reference value and an output current signal of the cascade SVG device, enabling the difference to pass through a current regulator, and enabling the output of the current regulator to be subjected to power grid voltage feedforward control to obtain a compensation current signal of the cascade SVG device. And the cascaded SVG bridge arm modulation voltage is obtained. According to the invention, high-efficiency grid-side reactive power control is realized, and grid-side high-frequency oscillation is suppressed at the same time.

The invention relates to the technical field of copper rod blank detection, in particular to a defect detection method and device for a copper rod blank, and the method comprises the following steps: S10, formulating a quality grade table of the copper rod blank; the copper rod blank is placed on a conveying roller way, and the conveying roller way is started; s20, the speed of a conveying roller way is adjusted, and when the copper rod blank is driven to move to the position in front of a detection area in the conveying direction, an electromagnetic rotation driving device and an electromagnetic induction detection module are started; s30, a second control unit and a second current regulator are used for controlling starting of a second electromagnetic coil, an electromagnetic sensor detects a defect signal, induced voltage is calculated, and defect information of the copper rod blank is collected; s40, calculating an intensity factor X1, a damage degree factor X2 and an influence degree factor X3 according to the defect information; the defect fraction Q of the copper rod blank is calculated according to the formula Q = W1 * X1 + W3 * X2 + W3 * X3; and rating the copper rod blank corresponding to the quality grade table. The method effectively reduces the omission ratio of the defects of the copper rod blank, and accurately recognizes the internal defects.

The smart torque simulation device includes: a bracket; a shaft center; a winding wheel which having a winding wheel spinning encoder; an outer flywheel which an outer flywheel spinning encoder, the winding wheel and the outer flywheel are relatively coupled with a magnetic plate and a magnet; an inner flywheel with a field magnet, the inner flywheel has a power transmission relationship with the outer flywheel; a coil set, having a coil fixing frame which has an armature coil, and the armature coil is coupled to the field magnet of the inner flywheel, the armature coil has an electric current regulator; and a control system, receiving a winding wheel spinning data from the winding wheel spinning encoder and receiving an outer flywheel spinning data from the outer flywheel spinning encoder, and then sending an armature electric current control data to the electric current regulator.

The invention relates to a method for improving the grid-connected stability of a grid-forming type inverter based on inductive current feedforward and coupling enhancement, and belongs to the technical field of inverter control. The method comprises the following steps: measuring inverter port voltage and filter inductive current, and calculating output active power and reactive power; calculating a port voltage reference value according to the amplitude and phase angle reference of the port voltage generated by the active controller and the reactive controller respectively; and taking the port voltage as a feedback value of the voltage regulator, and subtracting the feedback value from the port voltage reference value to serve as the input of the voltage regulator. And then adding the feedforward inductive current to the output of the voltage regulator to obtain a current reference value, and subtracting the inductive current from the current reference value to serve as the input of the current regulator. And finally, the output of the current regulator is added with the feedforward port voltage and combined with the cross-coupling enhanced voltage to obtain a modulation signal, and the modulation signal is subjected to space vector modulation to generate a driving signal so as to control the inverter. According to the method, on the premise that hardware cost and software complexity are not increased, the stable operation capacity of the grid-forming inverter under the strong power grid working condition is improved.

The present invention discloses a permanent magnet synchronous motor control method based on load torque compensation, wherein the speed of the permanent magnet synchronous motor is controlled by a PI speed controller, a load torque observer observes the load torque, and the output of the load torque observer is used to compensate the output of the PI speed controller for the load torque. The load torque observation uses an algorithm that automatically adjusts the feedback gain according to the change in the load torque given value and the change in the load torque observation value, and can quickly reduce the load torque observation error and feed-forward the load torque observation value to the current regulator when the system speed changes, or the parameters change, the load is disturbed, and the load torque given value changes or / and the load torque observation value changes, thereby improving the control accuracy of the permanent magnet synchronous motor.

A medium voltage inrush current (MVIC) regulator and interconnection control system for interposing between a distributed power generation facility and a utility grid. The facility has a designated generator step-up (GSU) transformer and is connected to the utility grid at a point of interconnect. The system includes a pre-insertion impedance injection transformer, a low voltage first switch connected between the pre-insertion transformer and secondary coils of the designated GSU transformer, a medium voltage second switch connected inline between the pre-insertion transformer and primary coils of the designated GSU transformer, and a controller. In response to restoration of the utility grid following a loss-of-grid event, the controller opens and closes the first and second switches according to an automated pre-energization switching sequence such that magnetic flux in the designated GSU transformer occurs at a reduced rate, thereby reducing inrush of current and undesirable power quality phenomena.

The embodiment of the invention discloses an inverter control method and device, computing equipment and a machine readable storage medium, and belongs to the field of photovoltaic grid connection. The control method of the inverter comprises the following steps: determining a first projection component of a grid-connected current on a d axis and a second projection component of the grid-connected current on a q axis according to an output phase angle of a phase-locked loop; obtaining a first current reference value component and a second current reference value component; acquiring a first modulation signal output by the d-axis current regulator based on the first projection component, the first current reference value and the first control parameter; according to the voltage component of the access point voltage on the q axis and the disturbance transfer function of the phase-locked loop, a suppression feedback signal is obtained; acquiring a second modulation signal output by the q-axis current regulator based on the second projection component, the second current reference value component, the suppression feedback signal and the second control parameter; and controlling the switch tube according to the first modulation signal and the second modulation signal.

The invention relates to the technical field of backlight control, in particular to an LED display-oriented adaptive PWM backlight control method and a backlight driving system, which are suitable for the backlight driving system comprising a boost converter, a brightness controller and an LED channel, and the method comprises the following steps: the brightness controller outputs a control voltage, a peak current control word and a duty ratio signal, and receives a state signal. Receiving brightness data, determining a nominal peak current and a duty ratio, and initializing the nominal peak current and the duty ratio; adjusting the control voltage to change the boost output, monitoring the state, locking the working point when all states are converted from the first state to the second state, and taking the final switching channel as a reference; a peak current word is increased for the non-reference channel under the working point, and when the state returns to the first state from the second state, an optimized peak current is taken back; and adjusting the duty ratio according to the ratio of the nominal peak current to the optimized peak current to enable the average current of each channel to be consistent. According to the invention, the problem that excessive voltage drop of a linear current regulator causes extra power consumption and heating and influences the brightness consistency between channels is solved.

Regulator circuitry configured to manage power supply ripple using an adaptive loop gain that offers ripple rejection performance related to the ripple magnitude for a negative closed loop of the regulator circuitry. The power supply regulator circuitry of this disclosure includes an error amplifier in the closed loop and an adaptive loop gain circuitry. The adaptive loop gain circuit removes a DC component of the sensed output and feeds the sensed output, including the output ripple, to peak detector circuitry to obtain a Vpeak signal. The Vpeak signal output from the peak detector circuitry is a continuous signal that tracks the wave peak. The circuit arrangement multiplies the output of the error amplifier by the signal Vpeak resulting in improved power supply ripple rejection as the ripple amplitude increases. To avoid control signal with zero value during times that the peak-to-peak value of the sensed voltage.

An amplitude regulator circuit portion is arranged to supply a current to an inverter in an oscillator circuit. The regulator monitors a voltage at the input terminal of the inverter and varies the current supplied to the inverter in response to the monitored voltage. The amplitude regulator comprises first, second, and third PMOS transistors, and first and second NMOS transistors and is arranged such that an input node is connected to the input terminal of the inverter, a respective gate terminal of each of the first and second NMOS transistors, and a respective drain terminal of the first NMOS and first PMOS transistors. The amplitude regulator also comprises a back-bias circuit portions arranged to vary a back-bias voltage at a back-gate terminal of the second NMOS transistor, to vary a threshold voltage, where the threshold voltage of the second NMOS transistor is lower than that of the first NMOS transistor.

The invention belongs to the technical field of motor control, and discloses a control method for switching an open loop to a closed loop of a permanent magnet synchronous motor, which is used for switching the permanent magnet synchronous motor from speed loop open-loop operation to rotating speed current double-closed-loop operation. Calculating an included angle delta between the shafting of the virtual synchronous rotating coordinate system dvirqvir and the shafting of the real rotor synchronous coordinate system dq; and then instantaneous switching of a command value of a current regulator, instantaneous switching of a current space voltage vector, switching of an angle variable used by coordinate transformation, initialization of a previous value of a low-pass filter, initialization of an integral term of the current regulator and initialization of an integral term of a speed regulator are executed in sequence, and open-loop switching and closed-loop switching of the permanent magnet synchronous motor are completed. According to the invention, the switching time is effectively shortened, and the switching stability and universality are improved.

System and method for controlling one or more light emitting diodes. For example, the system includes: a current regulator including a first regulator terminal and a second regulator terminal, the first regulator terminal being configured to receive a diode current flowing through the one or more light emitting diodes, the current regulator being configured to generate a sensing signal representing the diode current, the second regulator terminal being configured to output the sensing signal; a bleeder controller including a first controller terminal and a second controller terminal, the first controller terminal being configured to receive the sensing signal from the second regulator terminal, the bleeder controller being configured to generate a first bleeder control signal based at least in part on the sensing signal, the second controller terminal being configured to output the first bleeder control signal.

The invention relates to the technical field of motor detection, and particularly discloses a motor attenuation and aging detection device which comprises a test board, a mounting seat arranged on the test board, a power supply module, a torque sensor and a linkage adapter, the mounting seat is used for limiting a tested motor on the test board, the power supply module is connected with the tested motor, and the torque sensor is connected with the linkage adapter. The linkage adapter connects a rotating shaft of the detected motor with the torque sensor, and the torque sensor is used for detecting data of the rotating speed and the torque of the detected motor; the current regulator is connected with the power supply module and is used for regulating the output current value of the power supply module so as to control the rotating speed of the tested motor, and the central measurement and control system is connected with the torque sensor and the current regulator; the torque sensor is used for transmitting detected torque and rotating speed data to the central measurement and control system for processing and analysis, and the central measurement and control system processes the data of the input current value, the output torque and the rotating speed of the detected motor through a preset algorithm so as to evaluate the attenuation degree of the detected motor.

The invention discloses a motor control method, device and equipment and a medium, and relates to the field of motor control, when a mode switching condition is met, switching operation is not executed immediately, and the switching time is set at the commutation time of a motor, so that natural transition of a phase angle of a reference voltage vector is ensured; meanwhile, based on the running state of the motor in the first control mode, an integral initial value of the current regulator in the second control mode is preset, so that smooth connection of the amplitude of the reference voltage vector is realized. Through cooperative control of the phase angle and the amplitude, the problems of unstable motor operation, speed fluctuation, equipment stress damage and the like caused by discontinuous jump of the reference voltage vector at the switching point are solved, and the effect of improving the motor control performance and the system operation reliability is achieved.

The invention discloses a motor controller and a method for reducing load torque ripple. A motor controller includes: a measurement interface configured to measure a mechanical angle of a shaft driven by a motor and a rotational speed of the shaft, and to generate a speed feedback signal representative of the rotational speed; a speed regulator; and a current regulator. The speed regulator includes an error component configured to generate a speed error signal based on a difference between a speed reference signal and a speed feedback signal; a proportional-integral controller configured to adjust a torque reference value based on the speed error signal, the torque reference value configured to maintain a speed reference value; and a load torque ripple compensator configured to apply a torque feed-forward function to reduce a load torque ripple in the torque reference value. The current regulator is configured to drive a motor current of the motor to generate a torque corresponding to the torque reference value.

A method (100) for determining measured quantities in a mesh (7) of a low-voltage network (1) is presented and described. The method (100) comprises providing a mesh current controller (9) in a mesh (7) of a low-voltage network (1), wherein the mesh current controller (9) includes a controllable current and / or voltage source (29). Furthermore, the method (100) comprises determining at least one measured quantity of the mesh (7) using the mesh current controller (9) and the current and / or voltage source (27). A mesh current controller (9) for controlling a voltage in a mesh (7) is also presented and described. The mesh current controller (9) includes a controllable current and / or voltage source (29) and is configured to execute the method (100) described herein independently.Furthermore, a system (27) for determining measured quantities in a mesh (7) of a low-voltage network (1) and for controlling a voltage in the mesh (7) is shown and described, wherein the system (27) comprises a mesh current controller (9) with a measuring unit (29) for determining measured quantities in the mesh (7) at the mesh current controller (9). Finally, a use of a mesh current controller (9) in a mesh (7) of a low-voltage network (1) is shown and described, wherein no measuring points are used in the mesh (7) outside the mesh current controller (9) for determining measured quantities for the mesh current controller (9).

The invention discloses a whole vehicle electric drive resolver zero position identification and whole vehicle electric drive resolver zero position self-inspection method, and relates to the field of new energy electric drive control systems.The whole vehicle electric drive resolver zero position identification method comprises the steps that a direct-axis current instruction and a quadrature-axis current instruction are generated by receiving a torque instruction of a whole vehicle controller; sampling a motor phase current and performing coordinate transformation to obtain a feedback current; inputting the current instruction and the feedback current into a current regulator, and outputting direct-axis and quadrature-axis voltage components; injecting a high-frequency square-wave voltage signal into the direct-axis voltage component to generate a synthesized direct-axis voltage component, and performing PWM (Pulse-Width Modulation) to generate a driving signal; sampling the phase current again, extracting the high-frequency quadrature-axis response current, calculating the rotor position deviation, and inputting the rotor position deviation into the position observer to obtain the absolute position information of the rotor; wherein the PWM wave sending time sequence is aligned with the phase current sampling time sequence. According to the invention, the precision and efficiency of whole vehicle electric-drive rotary transformer zero position identification can be improved.

The present invention belongs to the technical field of motor fault control, and discloses a fault-tolerant control method for a common bridge arm in a semi-centralized open winding drive system. This fault-tolerant control method is aimed at the open-phase fault of the common bridge arm of the inverter in the semi-centralized open winding. The fault-tolerant control method includes the following steps: calculating the thrust command of the motor using a speed regulator; converting the thrust command into the dq0-axis synchronous current command of the motor; calculating the dq0-axis synchronous voltage command of the motor using a current regulator in combination with the actual dq0-axis current of the motor, transforming the dq0-axis synchronous voltage command of the motor into the symmetric abc-phase voltage command in the abc three-phase coordinate system, and distributing the symmetric abc-phase voltage command to each inverter. The present invention can achieve fault tolerance for the open circuit of the common bridge arm in the semi-centralized open winding drive system. At the same time, compared with the traditional open circuit fault-tolerant control strategy, the present invention can reduce the system loss and phase loss and improve the torque output ability of the fault system.

The smart torque simulation device includes: a bracket; a shaft center; a winding wheel which having a winding wheel spinning encoder; an outer flywheel which an outer flywheel spinning encoder, the winding wheel and the outer flywheel are relatively coupled with a magnetic plate and a magnet; an inner flywheel with a field magnet, the inner flywheel has a power transmission relationship with the outer flywheel; a coil set, having a coil fixing frame which has an armature coil, and the armature coil is coupled to the field magnet of the inner flywheel, the armature coil has an electric current regulator; and a control system, receiving a winding wheel spinning data from the winding wheel spinning encoder and receiving an outer flywheel spinning data from the outer flywheel spinning encoder, and then sending an armature electric current control data to the electric current regulator.

The application discloses a kind of self-adaptive power energy storage converter control method and system, this method can effectively solve the problem of overvoltage and under-voltage of grid-connected point and overcharge and overdischarge of energy storage battery by controlling the adaptive charge and discharge of energy storage battery.First, the grid voltage is sampled and the effective value is processed to obtain the grid voltage effective value feedback signal U gf_rms , and it is sent to the inverting input end of voltage error amplifier, and the grid voltage reference U ref Is sent to the non-inverting input end of voltage error amplifier.The output U e Of voltage error amplifier is obtained by positive and negative limiting link U e1 Is sent to one input end of multiplier.The state signal J of range determination is obtained by the state of charge signal Soc of energy storage battery, and the other input end of multiplier is sent.The output I ref Of multiplier is sent to the non-inverting input end and inverting input end of current regulator respectively with the charging current sampling signal I bf Of energy storage battery.The output of current regulator is used as modulation signal, and it is sent to PWM modulator.

The present invention discloses a method for optimizing parameters of a motor load torque observer. The load torque observation adopts an algorithm for automatically adjusting the feedback gain according to the change of the load torque given value and the change of the load torque observation value. When the system speed changes, or the parameters change, the load is disturbed, resulting in the change of the load torque given value or / and the load torque observation value, the observation error of the load torque can be quickly reduced and the load torque observation value can be feedforward compensated to the current regulator, thereby improving the control accuracy of the permanent magnet synchronous motor. When the load torque observer parameters are optimized and adjusted using the wolf pack algorithm, the wolf pack algorithm can achieve different optimization effects by reasonably selecting the value of the siege step attenuation factor ξ to achieve the maximum degree of adaptation by targeting different optimization objects such as finding an accurate optimal solution and avoiding the local optimum near the optimal solution.

The application provides a real-time monitoring device and method for air supplement amount of a Francis turbine unit of a hydropower plant, and relates to the field of Francis turbine units of hydropower plants.The device comprises a thermistor, an air supplement pipe, a current generator, a thermistor temperature sensor, a current regulator and a wind speed regulator, wherein the thermistor is fixed in the middle of the air supplement pipe, and the current generator generates rated voltage to heat the thermistor; the current regulator is used for real-time measurement of output current of the thermistor and records the change frequency of the output current; the wind speed regulator is used for measurement of wind speed at the air supplement pipe opening; and the thermistor temperature sensor is used for measurement of the temperature of the thermistor. The application fixes the thermistor in the air supplement pipe, determines the relationship curve between the air supplement amount and the output current, solves the problem that the air supplement amount of the Francis turbine unit cannot be monitored, and uses the thermistor principle to realize accurate measurement, is durable and not easy to be damaged, is convenient to install, can be introduced into a monitoring system, and can be monitored in real time on a host computer.

The application relates to the technical field of photovoltaic equipment detection, in particular to a testing device for photovoltaic engineering protection equipment and a method thereof, which comprises a stand, a photovoltaic frame, a photovoltaic panel group arranged on the photovoltaic frame, a plurality of overcurrent testing groups arranged on one side of the top of the stand; the photovoltaic panel group comprises a plurality of photovoltaic panels installed on the photovoltaic frame, a turnover group installed between the middle part of the stand and the photovoltaic frame and a servo cylinder; the servo cylinder drives the turnover group to drive the photovoltaic frame to turn over and unfold; the overcurrent testing group comprises a fuse connected in series with a row of photovoltaic panels, a current regulator and a short-circuit generator connected in parallel to the electrodes of the current regulator. The turnover group driven by the servo cylinder is linked with the photovoltaic frame, the inclination angle of the photovoltaic panel is adjusted and the photovoltaic panel is stored, the lower support frame and the upper support frame are cooperatively driven by the servo cylinder, the photovoltaic frame can be unfolded to 30 DEG to 90 DEG to receive light or be folded to reduce the occupied space, and the photoelectric output characteristics of the photovoltaic panel in a real scene are simulated.

The utility model discloses a real-time positioning system for implanting a catheter in a potential guiding sheath. The real-time positioning system comprises a positioning electrode plate, a potential guiding instrument and a guide wire body, the positioning electrode plate comprises an adhesive tape adhered to the body of a patient and a plurality of electrode plates arranged on the adhesive tape; the potential guiding instrument comprises a shell, positive and negative electrodes, a current change display and a voltage and current regulator are arranged on the shell, and a current signal receiver and a signal amplifier are arranged in the shell; the guide wire body comprises an insulating sleeve and a metal guide wire arranged in the insulating sleeve, the front end and the rear end of the insulating sleeve are closed, and a plurality of through holes are formed in the side wall; the head end of the metal guide wire is exposed, and the other part is wrapped by the insulating layer. The positioning electrode plate and the wire guide body are respectively connected with positive and negative electrodes to form a closed loop. The intrathecal infusion system solves the problems that in the implantation operation process of the intrathecal infusion system, the position of the catheter needs to be adjusted in a perspective mode repeatedly, real-time monitoring cannot be achieved, and the developing quality is not high, operation precision and efficiency are improved, and the X-ray exposure amount of a patient is reduced.

The present application relates to a kind of permanent magnet shielding motor vector control energy efficiency optimization method considering magnetic field lagging phase angle, belong to permanent magnet shielding motor control field.It is characterized by: by analyzing shield sleeve eddy current effect, the analytical expression of magnetic field lagging phase angle is derived using electromagnetic field theory;The lagging phase angle is introduced into permanent magnet flux linkage term to be corrected, and the eddy current loss of shield sleeve and stator iron loss are combined into equivalent iron loss component, and a system controllable loss model is constructed;Under the constraint of constant torque, the analytical expression of total controllable loss about direct-axis current is derived and the optimal direct-axis current given value is solved.The actual application introduces angle compensation in the coordinate transformation link of vector control system, and the optimal direct-axis current given value is sent into current regulator, the accurate decoupling of dq axis current is realized, the total loss of motor is reduced, so as to improve the overall efficiency of motor control system.

The present invention discloses a control method, device, motor, storage medium and processor for a motor. The method includes: in the field weakening control system of the motor, a single q-axis current regulator is adopted to freely switch between field weakening traction and braking control under field weakening conditions; in the control system of the single q-axis current regulator, a field weakening compensation module is added to perform field weakening compensation processing on the d-axis and q-axis currents of the motor; and an out-of-control limiting and compensation module is added to perform out-of-control limiting and compensation processing on the field weakening current of the motor to obtain the voltage vector angle of the field weakening control system of the motor; according to the voltage vector angle and the maximum stator voltage of the motor, the dq-axis reference voltage vector of the motor is determined to drive and control the system where the motor is located. With this solution, by adopting a single current loop control structure in the field weakening control of a permanent magnet synchronous motor and using a limiting method and a current compensation method for field weakening control, the stability of the control system of the permanent magnet synchronous motor can be improved.

A method for operating a renewable energy source having an inverter-based resource (IBR) system connected to a power grid, the method comprising: operating the IBR system as a virtual synchronous machine (VSM) in a grid formation mode (GFM) control; deriving a power error signal (PERR) between an actual real power output (Pfbk) and a power reference (Pref) from the IBR system; using a power error signal (PERR) to generate a power angle command signal received by the voltage regulator with the inertial power regulator; generating, with a voltage regulator, an x-direction current command (IRCmdx) signal and a y-direction current command (IRCmdy) signal, both the x-direction current command (IRCmdx) signal and the y-direction current command (IRCmdy) signal being received by a current regulator; and generating and adding an incremental x-direction current ([delta] IRx) component to the (IRCmdx) signal.

The disclosure relates to a battery system. The battery system comprises a first battery cell unit and a second battery cell unit, each one comprising a respective current regulator arrangement configured to control charging of a respective battery cell unit. The battery system further comprises a control arrangement. The control arrangement is configured to selectively control charging of the first and second battery cell units, by controlling the current regulator arrangement of the first battery cell unit to charge the first battery cell unit, and simultaneously by controlling the current regulator arrangement of the second battery cell unit to heat said second battery cell unit. The heating is performed by a pulsed charging cycle, preferably wherein the pulsed charging cycle is delivered by pulses having a frequency of 1 Hz – 1 MHz, preferably 10 Hz – 100 kHz. The disclosure further relates to a computer program and a computer-readable medium.