97 results about "Sinusoidal waveform" patented technology

The invention relates to a current control method for a continuous casting blank stirrer, and the method comprises the steps: setting control parameters of a variable-frequency controller in an electromagnetic stirrer, enabling an actual current to rise to a target current value, controlling the current to be increased to a current oscillation upper limit value at a certain rate, and then enabling the current to be reduced to a current oscillation lower limit value at a certain rate, and the circulation is repeated, so that the continuous casting electromagnetic stirring current is changed in a periodic sinusoidal waveform. The electromagnetic stirring current is controlled to change in a periodic sinusoidal waveform, so that the carbon segregation of the casting blank is improved, the carbon segregation range of the casting blank is reduced, the internal components of the casting blank are more uniform, and the performance of the casting blank is improved.

A first instrument comprising signal generator, resistor, voltage measurement device including a positive input and a negative input, monitored conductor terminal coupled to a monitored conductor, reference conductor terminal coupled to a reference conductor, and processor connected to the signal generator and the voltage measurement device. Output of signal generator electrically coupled to the monitored conductor terminal via the resistor, the positive input of the voltage measurement device electrically coupled to the resistor, the negative input of the voltage measurement device electrically coupled to the reference conductor terminal, and the processor instructs the signal generator to output a sinusoid waveform of a first frequency, read the voltage measurement device, calculate the resonant frequency or the impedance of the circuit coupled to the monitored conductor terminal and reference conductor terminal, and calculate and output the resonant frequency or the impedance of the circuit at the resonant frequency.

Methods, systems, and devices for wireless communication are described. The described techniques provide for a network device to transfer energy to a device with energy harvesting (EH) capability via a multi-sinusoidal waveform. The network device may transmit the multi-sinusoidal waveform according to a multi-sinusoidal waveform configuration indicating a frequency location across a channel bandwidth for each EH channel of the multi-sinusoidal waveform. In some cases, the network device may determine a multi-sinusoidal waveform configuration based on latency information for a passive IoT device, a channel quality measurement for channel bandwidth, or both. The multi-sinusoidal waveform configuration may indicate a distribution of individual EH channels across channel bandwidth to improve frequency diversity, may indicate contiguous grouping of EH channels to improve multi-sinusoidal gain, or a combination of these operations.

This invention provides an inverter load simulation device capable of producing a sinusoidal waveform output with suppressed distortion even at high switching frequencies. [Solution] The inverter load simulation device 1 includes switching circuits 13, 23, 33 which are bridge circuits composed of a plurality of switching elements SW1 to SW4, a drive control unit 51 which controls the driving of the plurality of switching elements SW1 to SW4 in the switching circuit 13, a filter 40 which converts the voltage output from the switching circuit 13 into a sinusoidal voltage, isolated DC / DC 11, 21, 31 which supply a DC voltage to the switching circuits 13, 23, 33 and which can change the DC voltage, and a DC voltage adjustment unit 52 which changes the DC voltage output by the isolated DC / DC 11, 21, 31 according to the voltage Vo output to the inverter P under test.

The application discloses an asymmetric phase-shifting control method suitable for a half-wave shaping MMC, and can realize wide-range operation energy balance of a converter. The method is characterized in that, in a 2pi period, a commutation unit switching function and a multi-level unit modulation voltage are not switched in a half-wave period pi, but in a positive half-wave mode, [0, pi] is taken as a reference to expand and shift an angle theta to the left and right, that is, the interval is [-theta, pi+theta], and in a negative half-wave mode, [pi, 2pi] is taken as a reference to shrink and shift an angle theta to the left and right, that is, the interval is [pi+theta, 2pi-theta]. The application adopts an asymmetric phase-shifting modulation method, generates and reverses polarities of two asymmetric partial sine waves through a commutation switch cooperating with a multi-level unit, and obtains a complete multi-level sine wave on an alternating current side. The application can eliminate the limitation of a power factor angle on a phase-shifting angle while realizing wide-range energy balance of the converter, is only affected by a modulation ratio, and compared with symmetric phase-shifting modulation, is beneficial to simplifying commutation control logic when the system is in a wide-range reactive power regulation, and has better engineering application value.

A method is provided for reducing common mode voltages in a system that includes an inverter connected to a motor by a long cable by controlling switches of the inverter to generate voltage vectors that emulate a three-phase sinusoidal waveform by switching between adjacent active vectors and active vectors that are separated by 180 degrees, determining whether a phase angle of the vectors is increasing or decreasing, determining a decision angle within the sector which is a function of a duty cycle offset and a modulation index; and applying duty cycle manipulation rules, including: responding to an increasing phase angle that is less than the decision angle by setting a duty cycle of the adjacent active vectors to a duty cycle high value; and responding to an increasing phase angle that is greater than 60 degrees minus the decision angle by setting the duty cycle to a low value.

The invention relates to the technical field of thermal interface material defect detection, in particular to a nondestructive detection method and system for thermal interface material application defects, and the system comprises an electric displacement table, heating laser, detection laser, a photoelectric detector, an acoustic optical modulator, a lock-in amplifier, an optical element and a data processing unit; the electric displacement table is used for fixing a sample and accurately controlling the position of the sample; the sample is of a silicon-thermal interface material-substrate sandwich structure; the upper-layer silicon wafer of the sample is plated with a metal film as a transduction layer; the heating laser is used for heating the sample; the acoustic optical modulator is used for modulating the heating laser, so that the heating laser heats the sample in a sine wave form; the detection laser is used for detecting sample temperature fluctuation; the photoelectric detector is used for collecting and detecting laser reflection signals; the lock-in amplifier is used for extracting and detecting laser phase and amplitude signals. According to the invention, non-destructive rapid detection of the defects of the thermal interface material in an application scene can be realized.

A voltage controller (204) detects (604) a voltage spike (244) in an electrical signal received from an electrical power source (208). The voltage controller (204) is implemented using a single-loop control system in a stationary reference frame. The electrical signal includes voltage harmonics caused by a non-linear or unbalanced load (256). The voltage controller (204) includes a phase-compensated harmonic regulator (220) that regulates the voltage harmonics present in the electrical signal and receives a feedback voltage (240) of the single-loop control system. The feedback voltage (240) is a delayed version of an instantaneous voltage (236) of the electrical signal. The instantaneous voltage (236) is sub-transiently stabilized into a steady-state voltage (232) based on the feedback voltage (240). Sub-transiently stabilizing the instantaneous voltage (236) is performed within a single cycle after the voltage spike (244) is detected (604). The steady-state voltage (232) has a total harmonic distortion less than a threshold total harmonic distortion and the steady-state voltage has a balanced sinusoidal waveform.

A sensor with a sensor drive circuit (15) to measure an external magnetic field applied to the sensor. An alternating current is supplied to at least two coils (1; 5; 8; 9) wound around two cores of the sensor. The cores are alternately saturated by the alternating current, with the alternating current being assigned to each core via a sinusoidal waveform. A first arithmetic mean is an average value of the sinusoidal signal. A second arithmetic mean is calculated from a high peak value of the sinusoidal waveform from one core and a low peak value of the sinusoidal waveform from the other core when at least one core is influenced by an external magnetic field.

The invention discloses a differential transformer measurement precision uncertainty determination method and system, and the method comprises the steps: calculating a driving signal frequency influence quantity, determining a displacement-voltage conversion slope deviation caused by the coil mutual inductance coefficient change due to the signal frequency drift of a sensor driving coil, calculating a waveform transmission efficiency influence quantity, and determining the measurement precision uncertainty of a differential transformer. In consideration of differential transformer iron core eddy-current loss difference caused by non-sinusoidal waveform harmonic components and energy loss caused by a sampling system bandwidth threshold, full-travel interpolation errors caused by interpolation calculation of non-equally-divided calibration points are quantized by calculating a finite position linearity influence quantity, and the total-travel interpolation error is calculated by multi-aspect component estimation. And determining the field measurement uncertainty of the differential transformer principle sensor in combination with a multi-factor uncertainty model. Therefore, the uncertainty value of the physical quantity measured by the corresponding sensor under the field condition is obtained, and effective data support is provided for determining the precision of the sensor and the test and control precision.

The present disclosure provides a RF power delivery method for delivering the RF power to a plasma load in a microelectronic manufacturing environment. The RF power delivery method includes generating a harmonically distorted sinusoidal waveform. Such harmonically distorted sinusoidal waveform being derived from a predetermined harmonic signature corresponding to a desired plasma state. Next, the method includes amplifying the harmonically distorted sinusoidal waveform and capable of operating under conditions of high reflected power. Next, the method includes interfacing with a non-linear plasma load impedance. Thereafter, the method includes measuring the RF power spectrum at an output of the fixed impedance matching network, the measured spectrum being used to adjust the amplified harmonically distorted sinusoidal waveform to recreate a desired plasma state.

In one embodiment, an interconnect apparatus (e.g., an interposer apparatus) includes a plurality of interconnect probes that each include a wave spring structure that includes a plurality of stacked wave spring discs. The wave spring discs may be formed in a sinusoidal wave form shape, or in another wave form shape.

The invention discloses a data transmission method and device, a storage medium and electronic equipment. The method relates to the field of edge calculation, and comprises the steps that target data collected by a data collection device are acquired, the target data are data representing the change condition of electrical parameters, and the electrical parameters change in a sine wave mode; even-number-bit sampling data in target cycle data in the target data are deleted, updated target cycle data are obtained, and the target cycle data are one piece of complete sine wave data in the target data; and the updated target cyclic wave data are sent to a target master station, and the target master station restores missing data values in the updated target cyclic wave data based on an interpolation method. Through the method and the device, the problem of high data transmission pressure caused by uploading the total data acquired by the data acquisition device to the master station in related technologies is solved.

The application discloses a combined high-g-value half-sine shock waveform generator and method, which comprises a gas storage tank, a launching cylinder, a combined waveform generator and a shock piston. A quick release device is arranged in the gas storage tank to instantaneously release compressed gas, and the compressed gas pushes the shock piston to move linearly along the launching cylinder at an acceleration. The shock piston collides with the combined waveform generator, an acceleration sensor on the shock piston records the acceleration signal of the shock process, and reflects the shock waveform experienced by the test piece. The combined waveform generator is composed of three material media of fiber non-woven fabric, polyurethane and asbestos. By changing the proportion of the three material media, the problem of strong nonlinearity of a single material medium can be corrected, and a high-g-value half-sine shock waveform complete in waveform and meeting a standard tolerance band can be obtained under high-speed impact. The application solves the problem of nonlinear mechanical behavior of a single material medium under high overload impact, and obtains a half-sine waveform meeting the standard tolerance band.

The invention discloses a V-type frequency modulation signal generation method and system, and the method comprises the steps: obtaining a discrete model of a V-type frequency modulation signal, and obtaining a frequency increment and a frequency initial parameter through the first-order difference relation between the frequency and the phase of the discrete signal; taking the frequency increment, the frequency initial parameter and the constant term as positive frequency modulation digital control parameters, constructing a linear increasing sequence based on the frequency increment, obtaining instantaneous frequency values at different moments by sequentially superposing the frequency initial parameter, and superposing the constant term on the instantaneous frequency values at different moments to obtain a phase sequence of the positive frequency modulation slope; negation processing is carried out on the positive frequency modulation digital control parameters, and a phase sequence of a negative frequency modulation slope is obtained through calculation; and according to the sinusoidal waveform, converting the phase sequence into amplitude data, and generating a V-shaped frequency modulation signal. By optimizing parameter configuration logic and simplifying operation, the operation amount of control parameters and the data transmission amount in the signal generation process can be greatly reduced, the calculation efficiency is remarkably improved, and the consumption of calculation resources is reduced.

The application provides a power measurement device and method based on an analog quantum voltage source. The first standard voltage source in the power measurement device is an analog quantum voltage source and is used to generate a first standard quantum voltage in a sinusoidal waveform. The second standard voltage source is an alternating quantum voltage source and is used to output a second standard quantum voltage in a sinusoidal step wave. In the case where the other end of the switch is connected to the second standard voltage source, the processor adjusts the first standard quantum voltage based on the second standard quantum voltage. In the application, the standard quantum voltage of the alternating quantum voltage source is transmitted to the analog quantum voltage source. The pure sinusoidal wave signal of the analog quantum voltage is conducive to reducing the difference value of the power difference sampling, realizing continuous measurement, reducing the requirement for the stability of the power source, and realizing a double-pass analog quantum voltage source, and simplifying the differential measurement control of the voltage and the current in different phases.

The application discloses a morphological super-drilling offshore rock-embedded single pile foundation and a construction method, and belongs to the technical field of offshore engineering. In view of the problems of single geometric form, synchronous brittle failure and insufficient bearing capacity of the interface of the existing rock-embedded pile, a morphological super-drilling area in the shape of a sinusoidal wave curved surface is formed below the pile body, and the area is filled with a material to be integrated. The construction steps include: drilling construction; a sinusoidal wave curved surface is formed by adopting high-pressure water jet and variable-diameter mechanical cutter compound cutting, the contour accuracy is ensured to be less than or equal to 5 mm through a laser ranging camera and closed-loop control; primary positive circulation hole cleaning and secondary air-lift reverse circulation combined high-pressure water jet hole cleaning are sequentially implemented; after the hole cleaning is qualified, primary self-leveling grouting, secondary high-pressure splitting grouting and tertiary steady pressure supplementary grouting are implemented. The shear dilation effect and asynchronous failure mechanism of the sinusoidal wave curved surface make the vertical bearing capacity of the rock-embedded pile be 2 to 12 times higher than that of the traditional rock-embedded pile, the failure mode is ductile, the construction consistency is good, and the construction cost of the deep-sea rock-embedded pile is reduced.

The utility model discloses a coil plate of an inductance type encoder, and relates to the field of inductance type encoders. A coil board of an inductive encoder comprises a PCB (printed circuit board), a plurality of exciting coils and a plurality of receiving coils, the exciting coils and the receiving coils are arranged on the PCB, and the PCB is a multi-layer board; the excitation coils are drawn concentrically on the same layer and are drawn in a staggered-layer overlapping manner, the coils on the same layer are electrically connected through outgoing lines, and the staggered-layer coils are electrically connected through conductive via holes; the receiving coil comprises a sinusoidal waveform coil with a plurality of periods; according to the receiving coil, drawing of a sinusoidal waveform coil of one period is reduced at the connecting position of the outgoing line of the exciting coil, and drawing of a sinusoidal waveform coil of one period is also reduced at the symmetrical position of the connecting position of the outgoing line of the exciting coil. According to the coil plate of the inductive encoder provided by the utility model, the maximum radial length of the receiving coil of the coil plate of the inductive encoder with the same specification can be ensured, and the performance of the encoder is ensured.

An image sensor is disclosed. The image sensor may include a plurality of sensing nodes electrically connected to at least one circuit of the circuits, the sensing nodes formed on the first side of a silicon layer adjacent to the circuits. Each sensing node may include a floating diffusion structure connected to one of at least one channel of the circuits and an output circuit. Each sensing node may include a charge reset structure configured to remove a charge from the floating diffusion structure. Each sensing node may include a noise-cancellation gate electrode adjacent to the floating diffusion structure and configured to be driven by a noise-cancellation signal. The image sensor may include a resistive gate electrode configured for at least one of direct current or non-pulsed signals. A charge reset structure of each sensing node may be driven with a voltage following a sinusoidal waveform.

The invention relates to the technical field of lithium battery packs, in particular to a lithium battery pack structure which comprises a first insulating plate and a plurality of single lithium battery cells arranged on the top of the first insulating plate, the single lithium battery cells are arranged in a honeycomb array, and an assembly space is reserved between every two adjacent single lithium battery cells; a plurality of single lithium cells which are positioned in the honeycomb array and are positioned in the same row are jointly surrounded by a functional bracket, the outer wall of the part, which is designed along the row, of the functional bracket is in a sinusoidal waveform, and a working gap is reserved between the inner wall of the functional bracket and the single lithium cells; a heat dissipation channel is designed between the outer walls of the sinusoidal waveform parts of every two adjacent functional supports, and wave crests and wave troughs of the sinusoidal waveform outer walls of the two adjacent functional supports correspond to each other. Structural supporting and the heat dissipation channels are integrated, protection is enhanced, meanwhile, the heat dissipation efficiency is optimized, a fire extinguishing structure and a pressure relief structure are designed in the safety cavity, and the safety of the safety cavity is improved. And the thermal runaway of the single lithium battery core is effectively treated.

The invention provides an asymmetric magnetic pole permanent magnet motor with low sinusoidal waveform distortion, and belongs to the technical field of automobile motor electric appliances, a magnetic pole on a motor rotor is formed by combining a plurality of pieces of permanent magnet steel and a magnetic isolation air gap, the magnetic isolation air gap guides the direction of a magnetic circuit, and the asymmetric design is adopted in the geometrical shape, the structural size and the magnetic field distribution; the cogging torque and the torque pulsation are remarkably reduced, the operation stability and the output stability are improved, the utilization rate of the magnetic field is improved through cooperation of multiple pieces of permanent magnet steel and magnetism gathering, the air-gap flux density is close to sine distribution, the waveform distortion rate is small, the air-gap flux density harmonic component is effectively restrained, and the stator iron core eddy current loss is reduced; and the motor efficiency and power density are improved.

An in-vitro method for stimulating the gene expression of at least one of XOXA10, LIF, ITGB3, XOXA11 and ITGAV genes in endometrial cells comprising applying on such endometrial cells electric current waves having a sinusoidal waveform with a fundamental frequency higher than 2 MHz, preferably of about 4 MHz, for a predefined amount of time.

An inverter circuit includes at least three output terminals, a first input terminal, a second input terminal, and at least three series bodies. A total switching duration and a one-phase fixed duration are present within a single cycle of AC output. The waveform of each phase of an output voltage is such that a shared offset wave is deducted from a sinusoidal waveform. The waveform of the offset wave matches one phase of the sinusoidal waveform, or matches a waveform obtained by shifting the one phase of the sinusoidal waveform in the amplitude direction, during the one-phase fixed duration. During switching between the total switching duration and the one-phase fixed duration, the inclination of the waveform of the offset wave either continuously changes or remains fixed.

A power conversion device includes a second DC / AC conversion circuit. The second DC / AC conversion circuit operates as a voltage source for an AC grid based on a command notified from an external controller to a communication interface. A fourth control circuit generates phase information of the grid AC voltage based on an actually measured value of a grid AC voltage output from the second DC / AC conversion circuit to a power distribution grid, and calculates a target AC voltage in a shape of a sinusoidal wave using a frequency command value of the grid AC voltage from the outside and the generated phase information. The fourth control circuit controls an operation of the second DC / AC conversion circuit to compensate for a deviation between the actually measured value of the grid AC voltage and the target AC voltage.

The application provides a reactor applied to micro fluidized bed thermal gravimetric analysis and a thermal gravimetric analysis device, which comprises, from bottom to top, a connecting pipe section, a heating pipe section and a reaction pipe section connected in sequence; the lower end of the connecting pipe section is used for being connected with a gas source, and a wind distribution plate is arranged at the connecting position of the connecting pipe section and the heating pipe section; the inner wall of the heating pipe section is in a sine wave structure; a heat conduction plate is arranged in the heating pipe section, and the heat conduction plate is located at a preset position above the wind distribution plate; the upper end of the reaction pipe section is provided with a top cover, and a central through hole is arranged in the top cover; the inner wall of the heating pipe section is arranged in a sine wave structure, the inner wall structure in a sine wave is utilized, the heating area of the fluidized medium is effectively increased, and the heat transfer efficiency is greatly enhanced; the heat conduction plate is additionally arranged in the heating pipe section, the heat conduction performance of the heat conduction plate is utilized, the heat transfer efficiency is improved, the uniformity of temperature distribution in the reactor is promoted, the heating rate of the fluidized medium is further improved, and the accuracy of test results is ensured.

A control system for a multiphase brushless motor without a position sensor, incorporating drive control electronics, comprising: a switching means, provided with two-state switches for varying the electrical voltage applied to each of the phases; a means for detecting overloading of the motor; and a means for determining an operating point, allowing at least two operating points to be applied, the control electronics being arranged to use space vector modulation or vector modulation to generate a sinusoidal waveform from a DC voltage, and the control electronics being arranged to modify the operating point at least once if an overload is detected by the overload detection means.

According to an aspect, a detection device includes: a sensor circuit including a plurality of sensor electrodes provided to a substrate, a peripheral electrode provided around a detection region provided with the sensor electrodes, and a shield electrode provided to a surface opposite to a surface provided with the sensor electrodes and the peripheral electrode; an AFE circuit configured to generate sensing data corresponding to a distance between the sensor electrodes and a proximity object, based on a detection signal acquired from the sensor electrodes; a drive signal generation circuit configured to generate a drive signal with a substantially sinusoidal waveform and supply the drive signal to the peripheral electrode and the shield electrode; and a control circuit configured to control the AFE circuit and the drive signal generation circuit. The control circuit controls an amplitude value of the drive signal based on the sensing data.

The invention relates to a short-circuit protection circuit and protection method for an alternating-current solid-state power controller, and belongs to the technical field of power electronics. The circuit can realize a protection function when current in a channel of the AC solid-state power controller is short-circuited. Current in a channel of the alternating-current solid-state power controller periodically changes in a sine wave mode according to power frequency, and a positive period and a negative period exist. The sampling resistor is used for sampling the current in the channel of the AC solid-state power controller, the reference level is designed to ensure that the current signals in the positive / negative period can be normally detected, the comparison circuit is used for carrying out short-circuit judgment on the current and outputting the short-circuit detection result, and the circuit has the advantages of economy and high reliability.

The invention relates to the technical field of heat exchange equipment, in particular to a plate-fin heat exchanger. The plate-fin heat exchanger comprises a plurality of channels which are stacked in the stacking direction, and each channel comprises two plate sheets which are separated from each other and are oppositely arranged in the stacking direction and a plurality of fins which are clamped between the two plate sheets and are separated from each other; the fins are in a sine wave shape, and any two adjacent fins are symmetrically arranged, so that a flow channel formed between every two adjacent fins becomes a variable cross-section flow channel with alternate widths. And fluids in every two adjacent variable cross-section flow channels are isolated. Meanwhile, the variable cross-section flow channels in the adjacent channels in the stacking direction correspond to each other, namely any wide cross-section part of each variable cross-section flow channel in each channel corresponds to the narrow cross-section part of the variable cross-section flow channel of the adjacent channel; and the narrow-section part corresponds to the wide-section part of the variable-section flow channel in the adjacent channel.

The application provides a sequential micro-mixer based on sinusoidal vortex flow, comprising a glass substrate, a PDMS cover plate with a micro-channel arranged on the glass substrate, two 3D electrodes arranged on two sides of the micro-channel respectively, a planar electrode connected with one end of the 3D electrode and connected with an external power supply at the other end, so as to form a uniform electric field in the micro-channel through the 3D electrode, and two suspended electrodes arranged in the micro-channel and asymmetrically arranged along the fluid flow direction of the micro-channel in sequence. The sequential micro-mixer has a high-efficiency and controllable mixing effect.