50 results about "Electronic current" patented technology

The invention provides an electronic current transformer operation data calculation system, and relates to the technical field of data processing, and the system comprises a data processing module which is used for carrying out the sliding time window scanning of an equipment dependence adjacency matrix, calculating the local reachable density under a dynamic neighbor topological distance through a local outlier factor algorithm, if it is detected that the harmonic total distortion rate gradient enters a statistical hypothesis test rejection domain or the winding temperature rise rate exceeds a material thermal aging critical threshold, extracting a multi-dimensional abnormal feature vector set; the risk quantitative index generation module is used for generating a risk quantitative index group from the multi-dimensional abnormal feature vector set through a pre-trained fault propagation probability model; and the processing instruction set generation module is used for establishing a multi-objective optimization function based on the risk quantification index group, performing non-dominated sorting evolution on a processing instruction chromosome by adopting an NSGA-II genetic algorithm, screening a dynamic optimization instruction sequence matched with a real-time load fluctuation coefficient through a Pareto frontier solution set, and generating a structured processing instruction set. The operation reliability of the power system is improved.

The invention discloses a signal transmission circuit and system of an electronic mutual inductor and a working method, and belongs to the field of electric power protection and measurement and control. A voltage signal in the same proportion as the primary current signal is output to the voltage-current conversion circuit, and the voltage-current conversion circuit converts the voltage signal into a current signal I1 and outputs the current signal I1 to the constant-current voltage stabilizing circuit; the constant-current voltage stabilizing circuit generates a current signal I2, the current signal I2 supplies power to a pre-stage circuit after voltage stabilization, the current signal I2 and a current signal I1 are superposed to output a current signal I3 to the power supply and signal separation circuit, and the protection measurement and control device extracts the current signal I1 in the current signal I3 and converts the current signal I1 into a voltage signal to be collected. A voltage signal suitable for being collected by an AD chip is output through an active differential amplifier, and power is supplied to a constant-current voltage stabilizing circuit. The problems that signal attenuation is obvious and independent power supply is needed during long-distance transmission of the electronic transformer can be solved.

The invention discloses a current transformer state analysis monitoring method based on interval modeling, and the method comprises the steps: collecting the ratio error data of an electronic current transformer, carrying out the preprocessing, and dividing the preprocessed data into a training set, a test set, and a verification set; the method comprises the following steps of: constructing a hierarchical deep learning model BITCN-BiLSTM-MHA; the preprocessed data are input into the constructed hierarchical deep learning model BITCN-BiLSTM-MHA, and model parameters after training are obtained; according to the trained model, measuring errors of the current transformer at different moments in the future are predicted, and deterministic prediction results of different time periods are generated; and according to the prediction result, carrying out probability distribution modeling on the prediction result by using an adaptive window width kernel density function, and generating prediction intervals of different confidence intervals. According to the method, in a dynamic complex signal environment, the variation trend of the measurement ratio error interval of the electronic current transformer in the future can be well predicted.

The invention provides a self-adaptive short-circuit fault current-limiting control method and system for a primary and secondary fusion circuit breaker, and relates to the technical field of circuit protection and manufacturing, and the method comprises the steps: collecting a current value, a voltage value and a state quantity of a circuit breaker, and forming a first operation parameter set; performing feature extraction based on the amplitude abrupt change, the phase offset and the harmonic component, generating a first feature vector, and matching the first feature vector with a preset short-circuit fault feature template to obtain a fault recognition result, a fault type and a position identifier; a dynamic current-limiting control curve is calculated according to the identifier and the current value, a current-limiting control parameter set is generated, and a current-limiting execution mechanism is controlled to obtain current-limiting response data; after the action is completed, a second operation parameter set is collected, current limiting effect analysis is executed to generate state feedback data, and a current limiting control parameter set is updated based on the feedback data; and factory calibration can be carried out on the power electronic current limiting module serving as a current limiting execution mechanism. According to the method, the adaptive capacity and accuracy of current limiting control are improved.

The utility model relates to the technical field of mutual inductors in electrical equipment, in particular to an integrated sleeve type electronic current transformer. Comprising an insulation packaging structure, a conducting rod, a current measuring module and a capacitance monitoring module, the insulation packaging structure is a fully-sealed sleeve-shaped epoxy resin shell formed by pouring epoxy resin, a wiring platform is arranged on the side face of the epoxy resin shell, the conducting rod axially penetrates through the insulation packaging structure, and the two ends of the conducting rod are exposed; the capacitance monitoring module comprises a capacitance wiring terminal and a capacitance induction net, the capacitance induction net sleeves the outer side of the conducting rod, the capacitance induction net and the conducting rod form a monitoring capacitor, and the capacitance wiring terminal is arranged on the wiring platform and is connected with the capacitance induction net; the current measuring module comprises a coil device body and a current shielding twisted pair, the coil device body is sleeved on the outer side of the capacitance induction net, and the current shielding twisted pair is connected with the coil device body. The current measuring and capacitance state monitoring device integrates functions of current measurement and capacitance state monitoring, and is highly compact in structure and low in cost.

The invention discloses an electronic current transformer based on wavelength division multiplexing, which comprises a Rogowski coil, an acquisition module and a merging unit, in the acquisition module, an acquisition processing unit is connected with the Rogowski coil, and the acquisition processing unit is used for acquiring an output signal of the Rogowski coil and converting the output signal into a first optical signal. And the power supply module is connected with the acquisition processing unit and is used for providing energy for the acquisition processing unit by using the second optical signal. The first wavelength division multiplexer is connected with the acquisition processing unit and the power supply module. The first wavelength division multiplexer is used for combining the first optical signal and the second optical signal. In the merging unit, a second wavelength division multiplexer is connected with the first wavelength division multiplexer through an optical fiber, and the second wavelength division multiplexer is used for separating the first optical signal from the second optical signal. The signal processing unit is used for processing the first optical signal. The energy supply unit is used for providing a second optical signal. According to the mutual inductor, the number of connectors and potential fault points are reduced, and the stability of the mutual inductor is improved.

The present invention relates to a control system for automatically adjusting the current of an AC arc heater, belonging to the technical field of power electronic current conversion. A PLC control module and a circuit breaker trigger control unit are mainly used to implement thyristor solid-state switches to control the on-off state of different taps of a choke reactor in the circuit, thereby achieving automatic adjustment of the operating current of the AC arc heater. The present invention adopts industrial network technology and PLC technology to achieve automatic adjustment of the current of the AC arc heater, avoiding manual replacement of taps and improving work efficiency. The application of advanced thyristor solid-state switch technology improves the reliability and safety of the equipment and reduces the failure rate of the equipment.

This invention relates to a distance protection method and system applicable to electronic current transformers. The method involves restoring the measured current of the electronic current transformer and the measured voltage of the conventional voltage transformer at the protection installation location before the fault occurs to the primary side current and primary side voltage. The constructed compensation current time series and the fault point voltage time series before the fault are input into a virtual transmission link for processing, resulting in the fault point reconstructed voltage after transmission. Based on the measured voltage at the protection installation location after transmission, the fault point reconstructed voltage after transmission, and the measured current at the protection installation location, combined with a line model, an equation related to the fault distance is obtained. An appropriate data window is selected, and the fault distance within that time window is solved. The fault distance is then substituted into a preset criterion to distinguish between faults within and outside the fault zone. Through this process, distance protection can be provided for single-phase and non-single-phase ground faults, avoiding the problem of inaccurate fault point voltage reconstruction leading to deviations in the calculated fault distance.

This invention relates to the field of power equipment insulation condition monitoring technology, and discloses a multi-source intelligent fault judgment method for compact ring main units (ECT) and electronic current transformers (EVTs). The method includes: simultaneously acquiring transient voltage and current data of the electronic current transformer in response to a voltage step event triggered by the closing action of the grounding switch; selecting short-time window data at the moment of the step, calculating the ratio of accumulated charge to voltage drop amplitude based on the principle of charge conservation, and calibrating the parasitic capacitance parameters of the equipment; constructing a capacitive displacement component using the parasitic capacitance parameters and voltage change rate, and decoupling it from the total current to reconstruct the dielectric response current reflecting the polarization process of the insulation material; performing multi-timescale decay trend analysis on the dielectric response current to identify the mechanism switching moment, and generating diagnostic results for insulation dampness or interface degradation accordingly. This invention can effectively suppress structural capacitance interference and achieve low-cost, high-precision insulation condition assessment.

A method for capturing dark energy. A plurality of centrifugal-force collectors are used to constitute a flywheel. Each centrifugal-force collector comprises a housing, a main shaft (4), and an electric motor / generator (5), wherein the housing comprises an outer housing and an inner housing (3); the outer housing comprises an upper housing (1) and a lower housing (2); a pneumatic or hydraulic element control cabinet (8) and an electronic current distribution cabinet (9) are fixedly mounted on an inner wall of the top end of the upper housing (1) and located on the left and right sides of the main shaft (4), respectively; a plurality of pneumatic cylinders / hydraulic cylinders (10) are mounted on the main shaft (4) and located below the electric motor / generator (5); an upper high-pressure gas storage or oil storage tank (11) and an upper low-pressure return tank and radiator (12) are respectively mounted on left and right sides above the pneumatic cylinders / hydraulic cylinders (10); a piston (13) is slidably connected to the side of an inner wall of each of the plurality of pneumatic cylinders / hydraulic cylinders (10) close to the main shaft (4); a return spring (14) is provided on the side of the piston (13) close to the main shaft (4); an outer magnetic block (19) is fixedly mounted on a semi-circular inner wall of the lower housing (2); a pneumatic motor or a hydraulic motor (24) is mounted above a second bearing (17); an inner magnetic block (20) is mounted on an inner wall of the inner housing (3); and a lower high-pressure gas storage or oil storage tank (21) and a lower low-pressure return tank and radiator (22) are respectively mounted on the left and right sides of an inner wall of the upper end of the inner housing (3).

Systems, methods, and apparatuses are provided for monitoring and automatically limiting an electrical current flowing to a pulsed or switching component that is voltage driven or controlled. For example, an apparatus may include a transistor electrically coupled to a power supply. In some examples, the transistor being configured to control current flow to a driver component. Additionally, the apparatus may include a resistor electrically coupled to the driver component, and a current monitor electrically coupled to a gate of the transistor and the resistor. In some examples, the current monitor may be configured to receive a threshold voltage, and receive an output voltage. Additionally, the current monitor may be configured to determine, whether the threshold voltage is greater than the output voltage, and based on the determination of whether the threshold voltage is greater than the output voltage, adjust the transistor to control the current flow to the driver component.

The invention discloses an electronic current transformer fault early warning model training method, and also discloses a current transformer fault early warning method for performing early warning by using a model obtained by the training method. According to the fault model training method provided by the invention, the Transform network is combined with the BiLSTM network for prediction, and the problem of precision reduction during long-time sequence data prediction is solved. Meanwhile, the NRBO algorithm is adopted to iterate the learning rate of the BiLSTM network, the number of neurons in the hidden layer and the regularization coefficient in the training process, the problems that the training time is prolonged, the fitting effect is reduced and the prediction precision is reduced due to the fact that relevant parameters are set through experience of research and development personnel are solved, and prediction is more accurate.

This invention provides a data calculation system for electronic current transformer operation, relating to the field of data processing technology. The system includes: a system for scanning the device-dependent adjacency matrix using a sliding time window; calculating the local reachability density under dynamic nearest neighbor topological distance using a local outlier factor algorithm; and extracting a multidimensional anomaly feature vector set when the total harmonic distortion rate gradient enters the statistical hypothesis test rejection region or the winding temperature rise rate exceeds the material's thermal aging critical threshold. The system then uses this multidimensional anomaly feature vector set to generate a risk quantification index set through a pre-trained fault propagation probability model. Based on the risk quantification index set, a multi-objective optimization function is established, and the NSGA-II genetic algorithm is used to perform non-dominated sorting evolution on the disposal instruction chromosomes. A Pareto front solution set is used to screen dynamically optimized instruction sequences that match the real-time load fluctuation coefficient, generating a structured disposal instruction set. This invention improves the reliability of power system operation.

This invention belongs to the field of intelligent substation technology, specifically an intelligent substation simulation testing device and method, including a base; a housing fixedly connected to the upper side of the base; a current transformer assembly fixedly connected to the upper side of the housing; a set of casters evenly distributed on the lower side of the base; a telescopic cylinder fixedly connected to the lower side of the base; a movable plate fixedly connected to the output end of the telescopic cylinder; and a conductive post fixedly connected to the lower side of the movable plate, with the conductive post electrically connected to the housing via a wire. By providing multiple casters on the lower side of the electronic current transformer, the current transformer is moved more conveniently, and the conductive post does not contact the ground when moving the current transformer, preventing mutual wear between the conductive post and the ground. After the current transformer is moved to the designated position, the telescopic cylinder drives the movable plate downward, thereby bringing the conductive post into contact with the ground. This allows the housing to be grounded through the wire and the conductive post, thus eliminating the static electricity generated during the operation of the current transformer and avoiding interference from static electricity during the testing process.

The invention discloses a TMR electronic current transformer with temperature and linearity compensation. The TMR electronic current transformer comprises a TMR sensing head and an acquisition device, the TMR sensing head comprises a TMR chip, a temperature chip, a corresponding power supply and a peripheral circuit; the acquisition device comprises an analog-to-digital converter, a processor, a memory, a corresponding power supply and a peripheral circuit; the TMR chip is used for sensing a measured current value and converting the measured current value into a voltage signal VTMR in an equal proportion mode, the temperature chip is used for sensing an environment temperature value and converting the environment temperature value into a voltage signal VTEMP in an equal proportion mode, and the voltage signal VTMR and the voltage signal VTEMP are both transmitted to the analog-digital converter. The analog-to-digital converter is used for converting the voltage signals VTMR and VTEMP into digital signals TMRAD and TEMPAD respectively; compensation parameters are pre-stored in the memory; and the processor is used for performing compensation calibration according to the digital signal TMRAD, the digital signal TEMPAD and the compensation parameter, and outputting data TMROUT after compensation calibration. On the other hand, the invention provides a compensation method of the TMR electronic current transformer, and the TMR electronic current transformer with temperature and linearity compensation is adopted.

The invention relates to the technical field of batteries, in particular to a composite diaphragm and a lithium ion battery. The composite diaphragm comprises a base membrane and a first coating arranged on the surface of at least one side of the base membrane, the first coating comprises temperature coefficient semiconductor particles, the temperature coefficient semiconductor particles comprise oxide ceramics, and the chemical general formula of the oxide ceramics is A < 1-x > R < x > B < 1-y > M < y > O < 3 >. Compared with the prior art, the porous coating containing the oxide positive temperature coefficient ceramic is constructed on the surface of the polyolefin base film, and the temperature response type electronic current limiting layer is introduced on the premise of not occupying the space of positive and negative electrode active materials, so that forward inhibition of thermal runaway is realized, and parasitic leakage and capacity attenuation under high-temperature storage are reduced.

A qubit device includes a crystal affixed to a substrate and in contact with an electrode. The crystal exhibits charge pair symmetry, and an electronic current moves in either a clockwise, counterclockwise, or both directions. An input current can be placed in a superposition state, where the current is unknown before being measured, and the direction of the current is measured to produce a binary output corresponding to a logical zero or a logical one. The state of the qubit device is monitored by measuring a voltage, a current, or a magnetic field, and assigning a superposition state or a ground state depending on a threshold.

The utility model provides an electronic current transformer, which belongs to the technical field of current transformers and comprises a current transformer main body, wire locking pieces are symmetrically attached to the edge of a threading hole of the current transformer main body, and a positioning driving component for driving the wire locking pieces to fix a wire is arranged on the side wall of the current transformer main body. The wire penetrating through the wire penetrating hole is fixed through the two wire locking pieces which move relatively, so that the position of the wire is locked, interference to the wire in the monitoring process is avoided, the accuracy of a wire monitoring result is further guaranteed, and when the current transformer body is connected, the wire can be conveniently and quickly locked. The displacement linkage assembly drives the two protective covers to move away from the two wire holders at the same time, then wiring is carried out, then the outer portions of the wire holders are protected through the protective covers, therefore, the wire holders are prevented from being disconnected with leads, in the operation process, the protective covers can also be prevented from making contact with the wire holders, and then the safety of the operation process is guaranteed.

The present invention relates to a transmit / receive circuit comprising: a receiver circuit (PHY-R) having a signal input (rx1, rx2) for a differential voltage signal and having a data output (Dout) for a data signal; a transmitter circuit (PHY-T) having an (electron) current source with two electrodes (+,-), having a data input (Din) for a data signal and having an (LVDS) signal output (tx1, tx2) with connection poles (tx1, tx2) for a differential voltage signal; two (bipolar) resistive elements (R1, R2); and a connection device (for connecting a signal cable having a pair of signal conductors) having two connection poles (tr1, tr2). Each of the connection poles (tx1, tx2) is electrically connected to one of the connection poles (tr1, tr2) between which one of the resistive elements is connected. The transmitter circuit (PHY-T) has at least two modes of operation (T-I, T-II) such that the transmitter circuit (PHY-T) is configured to convert a data signal at the data input (Din) into a differential voltage signal at the signal output in a first mode of operation (T-I # imgabs0 # transmission operation), and in a second operating mode (T-II # imgabs1 # termination mode), the connection poles (tx1, tx2) are electrically short-circuited or kept short-circuited.

The invention designs an RC-LIGBT device integrated with double self-biased MOS transistors and capable of reducing saturation current, and belongs to the technical field of semiconductors. The invention comprises a self-biased NMOS (N-channel Metal Oxide Semiconductor) at a collector side and a self-biased PMOS (P-channel Metal Oxide Semiconductor) at an emitter During forward conduction, the substrate of the self-biased NMOS inhibits electrons from directly reaching the collector through the collector N +, the Snapback effect is eliminated, injected holes enter the source of the self-biased PMOS, the voltage of the source is increased, self-biased opening of the PMOS is achieved, and the saturation current can be reduced through the caused hole extraction effect; during reverse conduction, a reverse electron current path of the device is provided after the self-biased NMOS is started, so that reverse conduction is realized; in the turn-off process, the opening of the self-bias NOMS provides an electron extraction channel, and the opening of the self-bias PMOS provides a hole extraction channel. According to the device, the Snapback effect is eliminated under the condition that an additional control electrode is not added, and compared with a traditional LIGBT, the saturation current is reduced by 21.2% when the collector voltage is 100 V, and the turn-off loss is reduced by 31.1%.

This utility model discloses a TMR electronic current transformer, including a TMR sensing head and a data acquisition device. The TMR sensing head includes a printed circuit board and a TMR chip, a temperature chip, and corresponding power supply and conditioning circuits disposed on the printed circuit board. A through-hole is provided in the center of the printed circuit board for the power system busbar under test to pass through. The TMR sensing head uses a single-chip, dual-chip, or ring array TMR chip. The TMR chip is used to sense the measured current value, and the temperature chip is used to sense the ambient temperature value. Both the TMR chip and the temperature chip are electrically connected to the data acquisition device. The TMR electronic current transformer provided by this utility model measures the power system busbar current based on the TMR chip, and has a series of advantages such as non-contact measurement, simultaneous AC and DC measurement, frequency up to the MHz level, small delay, large dynamic measurement range, low cost, high insulation level, small size, and high precision.

The utility model discloses an electric energy quality monitoring device and system, which are used for carrying out electric energy monitoring on a new energy station, and the electric energy quality monitoring device comprises an electric energy quality monitor, at least one electronic voltage transformer and at least one electronic current transformer. The electronic voltage transformer is arranged at a preset voltage monitoring position of a cable corresponding to the electronic voltage transformer in a new energy station and is used for acquiring a three-phase voltage signal of the cable; the electronic current transformer is arranged at a preset current monitoring position of a cable corresponding to the electronic current transformer in a new energy station, and is used for collecting a three-phase current signal of the cable; the electric energy quality monitor is connected with each electronic voltage transformer and each electronic current transformer so as to acquire a three-phase voltage signal and a three-phase current signal. According to the technical scheme disclosed by the utility model, the number of secondary loop signal transmission lines in the electric energy quality monitoring system can be reduced, and the risk of line faults of the system is reduced.

This invention discloses a semiconductor data testing anomaly early warning method and system, relating to the field of integrated circuit testing technology. The method includes: performing a stepped voltage test on the chip under test by calibrating a purely electronic current signal, while simultaneously monitoring changes in drain current, substrate current increments, and voltage states; calculating hot carrier injection efficiency parameters based on drain current changes and substrate current increments, and combining these parameters with the voltage states to generate photon detection commands; driving an InGaAs avalanche photodiode array to collect photon pulse counts based on the photon detection commands, and calculating a chip damage risk index based on the hot carrier injection efficiency parameters and photon pulse counts to generate a risk assessment report. This invention calculates the chip damage risk index using hot carrier injection efficiency parameters and photon pulse counts, achieving dynamic damage quantification analysis by integrating electrical parameters and optical data, thus achieving holographic perception and early risk identification of chip anomalies.

The present inventions relate to methods, systems, apparatuses, controllers, software, and composition of matter associated with connecting electrodes (e.g., a plurality of cathode structures) to a respective electrode (e.g., cathode) busbar within an electrode assembly of an energy storage device such as a (e.g., secondary) battery.

The invention relates to a method and a device for screening protection maloperation when an active electronic transformer is applied, and belongs to the field of relay protection. The screening method comprises the following steps: 1) under a no-load switching-on condition, calculating primary current and primary voltage at the installation position of the active electronic transformer corresponding to permutation and combination under different working conditions; permutation and combination of different working conditions comprise permutation and combination of different line lengths and different system impedance sizes; 2) according to the transfer function of each link of the active electronic transformer, taking the primary current and the primary voltage under different working conditions as input quantities, and calculating to obtain the output quantity of the active electronic transformer; and 3) substituting the output quantities of the active electronic transformer corresponding to different working conditions into a protection criterion, and screening the working conditions of which the criterion results are protection actions as maloperation working conditions. According to the method, the purpose of rapidly screening the working conditions of the relay protection misoperation can be achieved.

A dual three-phase permanent magnet synchronous motor control function hybrid sliding mode observer design method comprises the following steps: step 1, obtaining phase current of each phase of a motor through current sampling, and calculating to obtain motor reconstruction phase voltage according to a PWM duty ratio and bus voltage, performing VSD conversion on the sampled phase current and the reconstructed phase voltage to obtain stator current and electronic voltage of the motor; 2, taking the electron current and the stator voltage as the input of a hybrid SMO to obtain back electromotive force estimation, and taking the back electromotive force estimation before and after the LPF as the feedback input of the SMO; and step 3, extracting position information in the back electromotive force estimation after filtering by a phase-locked loop, compensating corresponding phase lag compensation, and finally taking the angle after compensation as motor rotor position estimation and applying the angle to actual control of the motor. The method is high in position estimation precision, small in buffeting, good in control performance, simple in algorithm structure and easy to implement.

The utility model relates to the technical field of power equipment, in particular to an integrated sleeve type electronic current and voltage combined transformer with a temperature monitoring function. Comprising a secondary signal transmission assembly, an insulating shell, and a conducting rod, a temperature monitoring module, a current measuring module, a voltage measuring module and a capacitance monitoring module which are arranged in the insulating shell, a boss is arranged at the side part of the insulating shell, and the conducting rod penetrates through the center of the insulating shell; the capacitance monitoring module comprises a capacitance wiring terminal and a capacitance induction net coaxially arranged with the conducting rod, and the current measuring module comprises a Rogowski coil arranged on the outer side of the capacitance induction net in a sleeving mode; the voltage measuring module comprises a primary ceramic capacitor fixed on the outer side of the conducting rod and a secondary capacitor connected in series with the primary ceramic capacitor; the secondary signal transmission assembly is embedded in the boss, and the Rogowski coil, the secondary capacitor and the temperature monitoring module are all connected with the secondary signal transmission assembly. The system provided by the utility model has the advantages of high integration level, strong adaptability, excellent safety, reliable performance, controllable cost and the like.

The invention discloses a device and method for converting electric energy stored by ionic charges into electronic current, and the device comprises a first ion storage container, the first ion storage container is connected with a first guide pipe through a first valve, the first guide pipe is spirally wound on a first iron core, and after being led out, the first guide pipe is connected with an ion recovery container through a second valve; the ion storage container I is connected with a second conduit through a third valve, the other end of the second conduit is connected with the leading-out end of the iron core I of the first conduit, the leading-in end of the iron core I of the first conduit is connected with a third conduit through a fourth valve, and the other end of the third conduit is connected with an ion recovery container; and a metal lead is spirally wound on the iron core I to form a coil I. Ionic charges which cannot be transmitted in the metal wire are converted into electron currents, the electron currents are transmitted through the metal wire and then can be provided for a load, the device can be compatible with existing electronic equipment, and the high-density stored ionic charges have the practical application value.

A method and system for producing an adjustable resistor with a set resistance for adjusting quiescent current in a GaN transistor in a power amplifier. A quiescent current on the GaN power amplifier is measured via a test probe from a microcontroller unit on a test fixture. A resistance value is determined for output of a voltage bias value to adjust the quiescent current of the GaN transistor in the power amplifier. The resistance value is stored in an electronically adjustable resistor. The adjustable resistor is coupled to an output voltage circuit to provide voltage at the voltage vias value to a voltage bias input of the power amplifier.

The utility model provides a stator assembly and tangential magnetic circuit hub motor wherein the stator assembly comprises a stator iron core, a support and a PCB, the stator iron core is sleeved and fixed on the support, the stator iron core comprises a yoke part and a plurality of tooth parts, the yoke part is annular, the plurality of tooth parts are distributed on the outer side of the yoke part at intervals along the circumferential direction of the yoke part and are fixedly connected with the yoke part, and the PCB is fixedly connected with the support. A plurality of tooth parts are arranged on the PCB, two adjacent tooth parts are encircled to form a stator groove, a stator winding is wound on the outer side of each tooth part, insulating sheets are arranged between the top and the bottom of each tooth part and the stator winding, one end of a plurality of stator groove openings in the plurality of stator grooves is provided with a Hall groove, a Hall sensor is arranged in the Hall groove, and the PCB is electrically connected with the Hall sensors. According to the utility model, the Hall slots are arranged on the slot openings of the stator slots, so that the influence of a magnetic field generated by electron current on the Hall sensors can be reduced.