538 results about "Square wave" patented technology

The invention discloses a data stream dynamic mode perception privacy protection method based on local differential privacy, which comprises the following steps: a client selectively captures salient points, retains a data trend while reducing the number of samples, and enhances the disturbance precision of each point to improve the overall data utility; the client side represents the importance of the salient points by calculating PID; the client obtains a sampling point by calculating a sampling rate so as to improve data utility; the client uses a dynamic privacy budget allocation method which adapts to the importance of current and future sampling points so as to optimize budget allocation on a time sequence; the client uses a square wave mechanism to disturb the salient points, and w event level differential privacy is used. According to the method, the user is allowed to select the salient points according to the statistical characteristics of own data, and then the privacy budget is allocated according to the importance of the salient points so as to disturb the salient points.

The invention discloses a tower grounding grid multi-frequency composite wave electric field imaging and soil environment medium diagnosis method, which comprises the following steps of: generating a composite excitation signal through superposition of a low-frequency sine wave and a high-frequency CHIRP square wave, and collecting multi-dimensional data such as voltage / current response, soil temperature and humidity, electric field intensity and the like in combination with a distributed sensor array; separating signal features by using wavelet transform and extracting impedance information of a target frequency point; a multi-grid homotopy algorithm is adopted to realize grounding grid three-dimensional resistivity distribution reconstruction, corrosion spots and abnormal areas are marked, and high-precision positioning of underground conductors is completed through UWB radar or a capacitance detector; meanwhile, based on the information entropy maximization optimization frequency band combination, the grounding grid state is comprehensively evaluated in combination with a multi-parameter fusion model. The method has the non-contact patrol capability, the unmanned aerial vehicle carries equipment to scan the grounding grid, the detection efficiency and convenience are remarkably improved, and an efficient and accurate solution is provided for guaranteeing safe operation of the power grid.

The embodiment of the invention provides a coating layer wall thickness pulse eddy current detection method and system based on multiple eddy current rings, and the method comprises the steps: applying a square wave excitation signal to an excitation coil, and carrying out the induction in a structural member with a coating layer to generate eddy current; collecting a voltage signal generated by induction of an attenuation magnetic field generated by the eddy current by using a receiving coil, wherein the attenuation process of the voltage signal comprises three stages; identifying a power function interval of the second stage to determine the starting time of the third stage; taking the starting time of the third stage as a reference, and selecting a preset thickness quantitative time interval in the third stage; calculating a first-order derivative of the voltage signal to time under a single logarithmic coordinate system in the thickness quantitative time interval to obtain a slope; according to the quantitative relation between the slope and the wall thickness of the structural part with the coating layer, the wall thickness value of the structural part with the coating layer is obtained through calculation.

An apparatus includes a power converter to convert incoming alternating current (AC) mains power into a direct current (DC) voltage. A linear AC pump of the apparatus has an arm that reciprocates linearly back and forth to move a pair of diaphragms to pressurize air that is output from the linear AC pump. The apparatus also includes a DC motor driver having an H-bridge that receives the DC voltage from the power converter as an input and that generates a square wave as an output that is coupled to the linear AC pump to drive the arm back and forth. The pressurized air from the linear AC pump is used to inflate one or more bladders of an air mattress, for example.

The invention relates to a magnetotelluric noise suppression method based on ResAtt-CAE, and the method comprises the steps: generating a noise-free signal, adding a noise type into the noise-free signal to construct a noisy signal, and enabling the noisy signal to be matched with the corresponding noise-free signal to form a training set and a test set; designing a ResAtt-CAE model architecture, and realizing cross-level feature fusion by adopting a symmetric structure and jump connection; the ResAtt-CAE model architecture is trained and optimized through the training set and the test set, and the magnetotelluric noise is suppressed through the optimized ResAtt-CAE model architecture. The method is high in noise suppression capability: ResAtt-CAE captures cross-time scale signal features through multi-scale residual learning, enhances effective signal weights in combination with a time domain attention mechanism, and has a remarkable suppression effect on common magnetotelluric noise (square waves, harmonic waves, pulses, triangular waves and the like).

The invention discloses a multi-channel transient electromagnetic detection method and device for a tunnel face, and relates to the technical field of geophysical information, and the method comprises the steps: planning horizontal measuring lines for the tunnel face at equal intervals, and planning measuring points on each measuring line at equal intervals; building a multi-channel detection array composed of a transient electromagnetic receiving coil and a transient electromagnetic transmitting coil, and carrying out primary field zero magnetic flux point adjustment; the method comprises the following steps: setting emission parameters according to detection depth and resolution requirements, then emitting bipolar square waves, carrying out measurement point-by-measurement observation by using an adjusted multi-channel detection array, constructing a geometric network which takes measurement lines, measurement points and channel numbers as indexes according to observation data, and carrying out multi-channel combined three-dimensional imaging. By constructing a multi-channel detection array, the data volume of a measuring point is increased, and the fineness of three-dimensional imaging is improved; through primary field zero magnetic flux point adjustment, the influence of a primary magnetic field is counteracted, and the signal-to-noise ratio of data is improved.

The invention discloses a permanent magnet synchronous motor full-speed-domain position-sensorless hybrid control method and a permanent magnet synchronous motor full-speed-domain position-sensorless hybrid control system, and the permanent magnet synchronous motor full-speed-domain position-sensorless hybrid control method is constructed by taking a permanent magnet synchronous motor nonlinear dynamic system model as a starting point. A hybrid control method combining high-frequency pulsating square wave signal injection under a linear dynamic system model, a rotor polarity judgment and rotor initial position estimation algorithm and an unscented Kalman filtering extension algorithm in an additive noise form under a nonlinear discrete dynamic system model is adopted; and obtaining the optimal estimation observation value of the system state variable in the static, low-speed, medium-speed and high-speed full-speed domain range under the condition that the permanent magnet synchronous motor is not provided with a mechanical position sensor. The optimal estimation observation value is used for compensating and feeding back a permanent magnet synchronous motor drive control system adjusting strategy, disturbance of load torque is improved, the noise amount and disturbance amount introduced by three-phase current measurement are eliminated, and efficient and accurate control operation of the permanent magnet synchronous motor is achieved.

The invention discloses a super-flat wire common-winding motor and a design method, and belongs to the technical field of motor design and manufacturing. The invention discloses an equal-pole common-winding axial magnetic flux motor and a design method, the equal-pole common-winding axial magnetic flux motor comprises a motor winding, a stator, a rotor, a casing and the like, and is characterized in that the number of magnetic poles of the stator and the number of magnetic poles of the rotor are equal, all the magnetic poles of the stator or the rotor on the same disc are excited through the same annular coil winding, and the winding can be a conventional round wire, a flat wire or a super-flat wire; alternatively, two or more concentric circle winding units, such as an outer ring winding unit and an inner ring winding unit, can be arranged on the same disc, radially adjacent iron cores can be shared or can also be independently arranged, meanwhile, the radial size of the shared iron core can be wider in consideration of the magnetic saturation problem, or the radial size of the shared iron core can be smaller in consideration of the magnetic saturation problem. The radial sizes of the iron core and the winding in the small-diameter area can be larger; the working principle can be a reluctance type, a switch reluctance type, a permanent magnet synchronous type, a direct-current motor type or an alternating-current motor type; the direct current motor can be a commutator or a plane commutator; or a brushless control scheme; the alternating current motor can be square wave, sine wave or other waveform; the phase difference of the three-phase alternating current can be 120 degrees; or two-phase or four-phase alternating current or other phase difference current with the phase difference of 90 degrees.

The embodiment of the invention provides a temperature detection circuit and method and electronic equipment, and the circuit comprises a temperature detection module which comprises a detection capacitor; the detection capacitor is used for generating a corresponding capacitance value according to the internal temperature of the electronic equipment; the conversion module is connected with the detection capacitor, and the conversion module is used for controlling the detection capacitor to charge and discharge repeatedly under the corresponding capacitance value and outputting a square wave signal according to the charge and discharge state; and the control module is connected with the conversion module and is used for acquiring the corresponding internal temperature according to the square wave signal. According to the electronic equipment, the detection capacitor is used for replacing a thermistor or a temperature sensor in an existing scheme to detect the temperature of the electronic equipment, and the detection capacitor has a direct current blocking effect, so that quiescent current cannot be generated, and the effect of reducing static power consumption can be achieved.

The present invention provides a flywheel energy storage flux adjustable induction motor and its magnetic adjustment method, wherein the motor comprises two permanent magnets with different coercive forces and a DC magnetic adjustment winding. A square wave pulse is input into the DC magnetic adjustment winding to generate a magnetic adjustment magnetic field, so that the residual magnetism of the low-coercive force permanent magnet changes in magnitude or direction, thereby realizing rapid adjustment of the motor air gap flux. When the motor is working, the DC magnetic adjustment winding is disconnected, and the residual magnetic flux generated by the high-coercive force permanent magnet and the low-coercive force permanent magnet enters the air gap in parallel to provide excitation flux for the motor; when the motor is on standby, a negative square wave pulse is input into the DC magnetic adjustment winding to generate a magnetic adjustment magnetic field that can reversely saturate magnetize the low-coercive force permanent magnet, so that the low-coercive force permanent magnet is reversely magnetized, and the residual magnetic flux of the high-coercive force and low-coercive force permanent magnets is equal in magnitude and opposite in direction, so that the air gap flux is reduced to 0, thereby eliminating standby iron loss. In addition, the DC magnetic adjustment winding can also be used as a backup excitation source to prevent the risk of permanent magnet demagnetization.

The invention discloses a motor control switching method and a control circuit thereof, and the method comprises the steps: determining a real-time motor control mode, collecting a system current and a system voltage based on the real-time motor control mode, and calculating the rotating speed of a motor based on the system current and the system voltage; the motor rotating speed is compared with a preset speed threshold value, motor control modes are switched based on a comparison result and a real-time motor control mode, and the motor control modes comprise square wave control and FOC control. Smooth switching of motor control modes is achieved by monitoring the rotating speed of the motor in real time and comparing the rotating speed according to the preset speed threshold value. Square wave control is adopted at a low speed to improve efficiency, and FOC control is switched at a high speed to improve control precision and dynamic response. By collecting system current and system voltage, the rotating speed of the motor is calculated, smooth transition is conducted in the switching process, and it is ensured that the motor stably operates under the large-load working condition within the full-speed range.

The invention provides a random rotation speed-oriented gear meshing stiffness calculation method, which belongs to the technical field of gear performance evaluation, and comprises the following steps: describing the actual operation state of a gear system by using a random rotation speed; determining the total potential energy of the gear according to the acting force of the meshing points; solving the total potential energy of the gear to obtain a potential energy calculation function about a meshing rotation angle; determining a meshing stiffness calculation function about the meshing rotation angle by using the potential energy calculation function; solving an average value of a single-tooth meshing area and a double-tooth meshing area of the meshing stiffness calculation function; and the meshing rigidity is simplified into a square wave function through the average value, and the meshing rigidity is changed into a time function from a corner function through the generated random rotating speed. According to the method, the running state of the gear system is described by using the random rotating speed, the influence caused by random fluctuation of the rotating speed is considered, the meshing rigidity of a wind power gear box and the like in the actual working environment can be reflected more truly, and the accuracy and applicability of meshing rigidity calculation are remarkably improved.

The invention relates to the technical field of industrial robot teaching, in particular to a robot position and speed protection method based on zero-force teaching, which comprises the following steps: (1) establishing a corrected friction compensation model based on a dynamic friction identification model; (2) estimating joint external torque by using a momentum observer according to the robot dynamics identification model and the joint feedback position, speed and torque; deriving a joint reference position and speed according to an admittance control law, and calculating a joint dragging compensation external torque in combination with a PD control law; (3) according to the joint movement range and the impedance position protection width, a joint impedance position protection limiting interval is generated, and then joint impedance position protection reaction force is generated; and (4) the joint dragging starting static friction is inhibited by using the periodic square wave joint dithering moment, and the amplitude and period of the dithering moment are adjustable. The method can effectively solve the problem that the zero-force teaching in the torque mode is difficult to realize the soft limit protection of the dragging position, the dragging speed limitation and the dragging starting static friction suppression.

The invention discloses a thermal management system based on double-layer phase change and air cooling cooperative heat dissipation. The system comprises a battery module, a first-stage phase change layer, a second-stage phase change layer, a binding post, a supporting plate, a sleeve and an air cooling channel. The double-layer phase-change cooling device is filled with two composite phase-change materials with high heat conductivity coefficients, and the composite phase-change materials are distributed in the radial direction, so that heat generated by the battery can be quickly absorbed, and the temperature in the battery module is kept uniform. And when the power battery module operates for a preset time length, the air cooling device is automatically started, and part of heat absorbed by the phase change device is dissipated to the environment. The air cooling system adopts a square wave type air supply strategy, that is, intermittent cooling airflow is provided by periodically starting and stopping a fan. By combining the double-layer phase change cooling and air cooling technology, the problems of non-uniform internal temperature distribution and local overheating of the battery module are effectively improved, the applicable working condition range of the battery module is expanded, and the stability and reliability of the system are improved.

The invention relates to a current source grid driving device, method and equipment of a semiconductor switching device. The device comprises a control module, a current and voltage detection module, a logic judgment module, an auxiliary control module and a current source driving module. The device can accurately detect the turn-on or turn-off state of the semiconductor switching device through the current and voltage detection module. Using a logic determination module to randomly adjust the start and stop time of triggering a turn-on current square wave or turn-off current square wave by an auxiliary control module according to a first reference voltage and a second reference voltage of voltage reference data and to adjust the output of the auxiliary control module according to a third reference voltage and a fourth reference voltage of the voltage reference data The current amplitude in the turn-on current square wave or the turn-off current square wave is calculated according to the current amplitude of the turn-on current square wave or the turn-off current square wave, so that the control current output by the current source driving module has a very high control freedom degree, and the switching loss of the semiconductor switching device can be reduced as much as possible while current and voltage oscillation in the semiconductor switching device can be easily suppressed.

The invention discloses a motor controller system and method for determining the rotation angle of an engine crankshaft, the system comprises a rotary transformer, a motor controller and an engine control unit, the crankshaft of a fuel engine and the input shaft of a motor are the same shaft, and the rotary transformer outputs a voltage analog signal; the motor controller receives the voltage analog signal and analyzes the voltage analog signal to obtain angle information, and outputs a pseudo square wave signal; and the engine control unit receives the pseudo square wave signal and controls the engine to perform oil injection and ignition according to the pseudo square wave signal. According to the invention, a crankshaft position sensor does not need to be installed on the flywheel of the fuel engine, signals of the crankshaft position sensor can be simulated, the timing of oil injection and ignition of the engine can be controlled, and the improvement such as analog-to-digital conversion does not need to be added to the engine controller unit, so that the working efficiency is improved.

The invention discloses a portable fan based on a three-phase micromotor, the portable fan comprises a power supply circuit, a controller, a drive axle circuit and the three-phase micromotor, the power supply circuit comprises a rechargeable battery, and the power supply circuit is connected with a power supply end of the controller and a power supply bus of the drive axle circuit; a driving pin of the controller is connected with a driven end of the drive axle circuit, three output ends of the drive axle circuit are connected with three electrodes of the three-phase micromotor, and the controller is used for outputting a driving signal to drive the drive axle circuit to generate three-phase alternating current of sine waves to drive the three-phase micromotor to start, stop or regulate the speed. The drive axle circuit is directly controlled by the controller, so that a drive chip of the drive axle circuit is omitted, and the cost is saved; on the other hand, compared with square wave driving, three-phase current driving based on smoother sine waves greatly reduces noise and power consumption of the three-phase micromotor, and the cruising ability is improved.

The invention provides a frequency selective surface inverse design method, device and equipment. The method comprises the steps of obtaining a target square wave; the target square wave is used for representing the expected transmission performance of the frequency selective surface; inputting the target square wave into a pre-trained multi-layer perceptron model to obtain a target design parameter corresponding to the frequency selection surface; the pre-trained multilayer perceptron model is obtained by training based on a preset sample data set; the preset sample data set is an equivalent circuit model established based on a transmission line theory, and is calculated by adopting an equivalent inductive reactance and capacitive reactance empirical formula. According to the method, the equivalent circuit model based on the transmission line theory is used for replacing full-wave simulation, the complex electromagnetic field solving process is avoided, the sample data preparation time is remarkably shortened, due to the fact that the pre-trained multi-layer perceptron model is introduced, the target square waves are directly mapped to the corresponding design parameters, rapid and efficient reverse design is achieved, and the method is suitable for large-scale popularization and application. And the efficiency and the precision of the frequency selective surface design are obviously improved.

The utility model relates to the technical field of vibration motors, and discloses a flat vibration motor, which comprises a shell assembly, an end cover, a stator assembly, a rotor assembly and a fixed shaft, the shell assembly and the end cover are buckled to form an accommodating space, the stator assembly is fixed on the inner surface of the end cover, and the fixed shaft is fixed in the center of the end cover. The rotor assembly is arranged on the fixed shaft in a sleeving manner and rotates around the fixed shaft, the shell assembly comprises two separation blades which are vertically arranged in the accommodating space in a spaced manner and springback sheets which are adaptively arranged on the inner sides of the separation blades, and the rotor assembly comprises a bracket, elastic mechanisms which are positioned on two sides of the bracket, an eccentric hammer which is fixed on the bracket and a first magnet which is embedded in the eccentric hammer; the stator assembly comprises a flexible circuit board, an annular coil and a second magnet embedded in the coil; the first magnet and the second magnet are vertically and correspondingly arranged at intervals so as to attract each other to maintain the initial position of the rotor assembly, square wave current is switched to the coil to generate a magnetic field, and the magnetic field and the first magnet perform mutual attraction and mutual exclusion rotary motion, so that more diversified vibration modes are realized, and the vibration sense is stronger.

The utility model discloses an automatic packaging detection circuit for a tantalum capacitor, which comprises a square-wave generator, a current reversing switch, a first detection branch and a second detection branch, and is characterized in that the square-wave generator and the current reversing switch are connected in series and then are sequentially connected with a resistor Rcs and a detected capacitor CDUT; the first detection branch and the second detection branch are connected in parallel; the square wave generator is used for charging the tested capacitor CDUT; the current reversing switch is used for controlling the charging and discharging current of the capacitor CDUT; the first detection branch is used for carrying out open circuit detection on the capacitor CDUT; and the second detection branch is used for carrying out short circuit detection on the detected capacitor CDUT. According to the utility model, the tantalum capacitor packaging is detected by adopting the circuit, the detection circuit is simple in structure, low in cost, high in detection speed and very suitable for automatic detection equipment, multiple groups of circuits can be tested at the same time, multiple devices can be tested at a time, and the test efficiency is greatly improved.

A high-gain automatic phase modulation quartz vibrating beam accelerometer control circuit comprises a feed-through suppression module, the feed-through suppression module and a quartz vibrating beam resonator form a parallel resonance unit, and the output of the parallel resonance unit is connected with the input of a front-end amplification module. The output of the front-end amplification module is connected with the input of the high-pass filtering module and the first input of the automatic phase control module, the output of the high-pass filtering module is connected with the first input of the dynamic phase shift module, and the second input of the dynamic phase shift module is connected with the output of the automatic phase control module. The output of the dynamic phase shift module is connected with the input of the differential driving module through the low-pass filtering module, the square wave shaping module and the amplitude control module; the output of the differential driving module is connected with the input of the feed-through suppression module, the driving end of the quartz vibrating beam resonator and the second input of the automatic phase control module; according to the invention, low-noise driving of the high-impedance quartz vibrating beam is realized, and the loop phase error is dynamically compensated to improve the stability and resolution of the accelerometer.

The invention belongs to the technical field of nondestructive testing, and particularly relates to a delayed sampling infrared nondestructive testing method and system based on a uniform light field. The invention provides a delayed sampling infrared nondestructive testing method and system based on a uniform light field in order to solve the problems of an active infrared nondestructive testing method in the aspects of light beam uniformity, defect contrast, reflected light interference and the like. The delay sampling infrared nondestructive testing method based on the uniform light field comprises the following steps that 1, synchronous square wave signals and continuous pulse wave signals are generated, and the continuous pulse wave signals are delayed from the square wave signals; 2, the square wave signal controls a laser 3 to alternately change between a light emitting state and a light extinguishing state through periodic switching of high and low levels; and step 3, energy emitted by the laser 3 is in near Gaussian distribution, and non-uniform laser is transmitted to the light beam homogenizer 5 through the optical fiber 4.

The invention discloses an ion pump high-voltage power supply, and belongs to the technical field of power supplies and ion pumps. The ion pump high-voltage power supply comprises a square wave generation circuit, a forward inverter circuit, a voltage doubling circuit, a power supply management circuit and a high-voltage restart auxiliary circuit. The two voltage doubling circuits for generating positive and negative high voltages share one set of converter and transformer, so that the efficiency is improved, and the installation size is reduced; the output current of the high-voltage power supply is monitored in real time, the high voltage is closed when the current is lower than a set threshold value, and the high voltage is restarted after a period of time, so that the operation efficiency is further improved; compared with a scheme of increasing the capacity of a storage battery, the high-voltage power supply has the advantages that the cost of the system can be greatly reduced, experimental results show that the high-voltage power supply can continuously run for more than 30 days under the condition that only one 9V dry battery is used, and compared with the prior art, the endurance time of the high-voltage power supply is remarkably prolonged.

The invention discloses a novel permanent magnet synchronous motor sensorless compound control strategy, and relates to the field of motor control. The method comprises the following steps: replacing a traditional proportional-integral controller with a nonsingular terminal sliding mode controller in a speed outer ring design, using an integral sliding mode surface, omitting an integral link of a q-axis given current, and replacing a sign function with a sigmoid function to improve the dynamic performance and robustness of a system; a high-frequency square wave injection method is adopted to carry out low-speed-domain position-sensorless control, in a middle-high-speed domain, aiming at the system buffeting problem caused by a traditional sliding mode observer, super-spiral sliding mode observation is adopted to carry out rotation angle observation, and meanwhile, an orthogonal phase-locked loop is adopted to eliminate the influence of large numerical value difference possibly occurring due to angle errors. The invention provides a novel permanent magnet synchronous motor sensorless compound control strategy, namely an angle-speed time-sharing weighted hysteresis switching strategy, aiming at the problem that the stability of a transition area is affected due to the fact that the traditional weighted switching in compound control possibly causes large deviation of the relation between the rotating speed and the rotor position. The non-singular sliding mode speed controller, the high-frequency square wave injection method, the improved super-spiral sliding mode observer method and the angle-speed time-sharing weighted hysteresis switching strategy are applied to the full-speed-domain sensorless control system, and the high-performance surface-mounted permanent magnet synchronous motor sensorless control system is achieved.

The invention provides a method for identifying lithology, and belongs to the technical field of geophysical exploration. The method comprises the following steps: acquiring magnetic field amplitude data obtained by inversion of a natural electromagnetic field; preprocessing the magnetic field amplitude data; carrying out square wave layering processing on the preprocessed magnetic field amplitude data and taking values layer by layer; magnetic field lithology sensitive parameters are extracted based on the magnetic field amplitude data after square wave processing; establishing a lithology identification plate and a lithology identification standard based on the magnetic field lithology sensitive parameters and the resistivity lithology sensitive parameters; the resistivity lithology sensitive parameters are obtained from logging data; and identifying lithology distribution of different depths based on the lithology identification plate and a standard. Therefore, the acquisition cost of the electromagnetic survey method is reduced, and the lithology is identified by using the electromagnetic survey method.

The invention discloses a direct-current power transmission system EM lightning arrester zinc oxide resistor disc selecting and balancing method, and belongs to the technical field of lightning arrester disc selecting and matching. The disc selecting method comprises the steps that S1, direct-current parameter testing is carried out, and damped and aged resistor discs are removed based on the direct-current parameter testing result; s2, applying lightning and operation impact to the resistor discs, measuring residual voltage, calculating a voltage ratio based on the residual voltage, and rejecting the resistor discs of which the voltage ratio deviation is not within a set voltage ratio threshold range; s3, carrying out square wave energy testing on the resistor discs, and removing the damaged resistor discs in the testing process; s4, performing long-wave residual voltage test on the resistor discs one by one by using the test square wave, recording a long-wave residual voltage value obtained by the test, and removing the resistor discs which are subjected to breakdown, flashover and aluminum surface burning in the test; calculating long-wave residual voltage deviation of the resistor discs under square wave excitation, and removing the resistor discs with the long-wave residual voltage deviation exceeding a set long-wave residual voltage deviation threshold value; and the sheet selection scheme of the EM lightning arrester is perfected, and the accident rate is reduced.

The invention relates to the technical field of aviation fuel measurement, and discloses an aviation fuel measurement system and method based on square wave excitation, the system comprises a fuel sensor, a processor unit and a proportional amplification unit, the proportional amplification unit comprises a feedback capacitor, a grounding resistor and an operational amplifier, and the system also comprises a third A / D conversion unit and a second A / D conversion unit. The real-time value of the fuel sensor is calculated by reading the acquisition results of the second A / D conversion unit and the third A / D conversion unit by utilizing a square wave excitation signal sent by the processor unit according to the acquisition results of the second A / D conversion unit and the third A / D conversion unit, so that the high-precision measurement of the fuel quantity is realized; the measuring system is simple in structure, simple and convenient in operation process, low in cost and high in reliability.

The invention discloses a closed-loop control method and device for a single transmitting side analog circuit of a wireless power transmission system, and the method comprises the steps: constructing a power transmission structure of the wireless power transmission system based on an SS-type two-coil wireless power transmission topology and an E-type power amplifier, and carrying out the power transmission; obtaining a voltage signal and a current signal by using a signal detection circuit; inputting the signal into a receiving side information back calculation circuit to obtain a coupling coefficient of a primary side coil and a secondary side coil and the size of a load; the duty ratio when the power transmission structure of the wireless power transmission system has the optimal transmission efficiency and output power is obtained through the transmitting side switching tube control structure, control square waves of the E-type power amplifier switching tube are generated according to the duty ratio, the control square waves are sent into the switching tube driving circuit, the control square waves are amplified, and the power transmission efficiency of the E-type power amplifier switching tube is improved. And opening and closing of the switch tube are controlled to complete closed-loop control. The device is simple in structure, high in efficiency, low in cost and wide in application range, and has good practical application value.

The application discloses a kind of continuous high-voltage pulse electric field processing berry functional active ingredient reinforced extraction method.The method comprises the following steps: after the cooling device is cooled to reach the set temperature by the processing chamber device, set high-voltage pulse power output parameter, high-voltage pulse power generates bipolar symmetric square wave, set pulse electric field parameter, the distance of two titanium alloy electrodes is 100mm, the pretreated berry material is transported to the processing chamber body, and the high-voltage pulse electric field processing is carried out on the berry material, to obtain the berry extract containing active ingredient.The method proposed in the application uses continuous round square corrosion-resistant pulse electric field processing chamber, the overall structure is convenient to assemble and process, the processing chamber can be increased according to actual needs, and synchronous cooling can be realized at the same time, the low-temperature extraction and active protection of functional active ingredient are realized while the electrode is protected.

A method for enhanced extraction of functional active ingredients from berries by using continuous high-pulse electric field treatment. The method comprises the following steps: after a treatment chamber apparatus is cooled to a set temperature by means of a cooling apparatus, setting high-pulse power source output parameters; a high-pulse power source generating bipolar symmetric square waves; setting pulse electric field parameters, the distance between two titanium alloy electrodes being 100 mm; conveying pretreated berry materials to the body of a treatment chamber; and performing high-pulse electric field treatment on the berry materials, so as to obtain a berry extraction solution containing active ingredients. In the present invention, a continuous circular-to-square corrosion-resistant pulse electric field treatment chamber is used, such that the overall structure is convenient for assembly and machining; additional treatment chambers can be added according to actual requirements; and synchronous cooling can also be realized, thereby realizing low-temperature extraction and activity preservation of functional active ingredients while protecting electrodes.