32 results about "Triangular wave" patented technology

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

The invention provides a tunnel blasting equivalent load prediction method and system based on an artificial neural network for tunnel blasting dynamic response rapid evaluation. The method comprises the following steps: firstly, establishing engineering parameters for describing a single-hole blasting working condition of a tunnel, and converting the engineering parameters into dimensionless input parameter vectors; aiming at continuity parameters and grading parameters, generating sample working conditions by adopting an orthogonal test and Latin hypercube combined sampling mode, carrying out numerical simulation on each working condition, extracting a blasting triangular wave speed-time history curve of a representative measuring point in the model, and establishing a blasting triangular wave speed-time history curve with engineering parameters of a single-hole blasting working condition as input; the database takes blasting triangular wave parameters as output; an artificial neural network is trained under the loss function, rapid prediction of triangular wave parameters is achieved, and triangular waves can serve as blasting equivalent load time history to be applied to the normal direction of the plane where representative measuring points are located and used for tunnel blasting dynamic response calculation. According to the method, the calculation cost and the modeling complexity can be remarkably reduced, and the numerical calculation stability and the engineering applicability are improved.

The application discloses a permanent magnet synchronous motor parameter identification method based on triangular wave injection and relates to the technical field of motor control. A triangular wave with a direct current bias is injected into the d-axis current of the motor. In the identification equation of the autoregressive least square algorithm, the current differential term in the voltage equation of the permanent magnet synchronous motor is considered. Two groups of input data with low linear correlation are combined into a new equation group. The parameters of the motor are divided into two sections, the new equation group is used for identification, and an identification result is output. The segmented autoregressive least square method parameter identification based on triangular wave injection can realize real-time identification of the resistance, inductance and flux linkage of the motor when the motor is in steady operation, so that the control performance of the double closed loop vector control of the permanent magnet synchronous motor is further improved.

The application discloses a control system of a pulse sequence control triangular wave current mode soft switching Buck converter, the Buck converter comprises a direct current input power supply, a first switching tube, a second switching tube, an inductor, an output capacitor and a load, the positive pole of the direct current input power supply is connected with one end of the second switching tube and one end of the inductor through the first switching tube, the other end of the inductor is connected with one end of the output capacitor and one end of the load, the other end of the output capacitor, the other end of the load and the other end of the second switching tube are connected with the negative pole of the direct current input power supply, and the control system comprises a PT controller, a voltmeter for detecting and collecting a voltage signal between the load and a current meter for collecting an inductor current, wherein the input end of the PT controller is connected with the output end of the current meter and the output end of the voltmeter, the output end of the PT controller is connected with the control end of the first switching tube and the control end of the second switching tube, and the control system can control the size of negative current and has a relatively simple structure.

An electronic device may include an inverter. The inverter may receive the switching signal based on the jitter clock signal and output a corresponding AC signal to the wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repetition period of the dithered clock signal. The repetition period of the jitter clock signal may include a step function that approximates a triangular waveform, wherein the step has a unique magnitude of frequency during the repetition period.

This invention discloses an overshoot temperature control circuit for inkjet printheads, relating to the field of inkjet printing technology. It includes a processor module, a temperature-to-voltage conversion module, an error amplification module, a temperature sensor disconnection protection module, a triangular wave generator module, an analog-to-comparison PWM generation module, and a power switch module. The advantages of this invention are significantly improved print quality, rapid and overshoot-free dynamic response, effective suppression of temperature overshoot, extended printhead lifespan, and good energy-saving performance.

The present application relates to the technical field of anti-collision buffer, and provides an imitation cuttlebone gradient anti-collision plate, an anti-collision buffer bag and a manufacturing method, the imitation cuttlebone gradient anti-collision plate comprises a collision plate and a support plate, the plate surfaces of the collision plate and the support plate are parallel to each other, a plurality of rows of buffer plates are connected between the collision plate and the support plate, one end of the buffer plate connected with the collision plate is a collision end, one end of the buffer plate connected with the support plate is a support end, the curves of the collision end and the support end of the buffer plate present different triangular wave function curves, and the curves of the collision end or the support end of adjacent buffer plates are symmetrically arranged. The present application can disperse the collision energy in a gradient, smooth the collision impact force, and has the advantages of overall light weight, convenient replacement and good economy.

The invention belongs to the related technical field of multi-active bridge converters, and provides a high-frequency current direct-current bias suppression method and system for an MAB converter in order to solve the problem of high-frequency direct-current bias of an existing MAB converter. Decomposing the high-frequency current of the port of the multi-active bridge type multi-port direct-current converter into superposition of triangular wave current components excited by a plurality of square wave voltage sources respectively; according to the phase shift ratio of the square wave voltage component control variable in the previous control period and the phase shift ratio of the square wave voltage component control variable in the current control period, determining a phase shift phase abrupt change working condition; according to different phase shift phase abrupt change working conditions, bridge arm opening and closing switching moments corresponding to the two voltage switching moments of the square wave voltage in the period are calculated; and calculating a carrier phase and a modulation signal according to the switching time to realize direct-current bias suppression of the high-frequency current. The method can be expanded and applied to MAB converters with any number of ports, is simple, and can eliminate the adverse effects of DC bias on the efficiency and safety of the converters.

The invention relates to the technical field of batteries, in particular to a battery monomer, a formation method thereof and a power utilization device. The method comprises the following steps: applying triangular wave pulse pressure to a battery monomer semi-finished product; charging to a first charge state by adopting a first multiplying power constant current and applying a second pressure mode; charging to a second charge state by adopting a second multiplying power constant current, and applying bipolar triangular wave pulse pressure; charging to a third charge state by adopting a third multiplying power constant current, and applying a constant voltage; and performing constant-current charging to a fourth charge state by adopting a fourth multiplying power, and applying sine wave pulse pressure. The method comprises the following steps: applying triangular wave pulse to promote electrolyte infiltration, adopting a second pressure mode to reduce expansion buffer stress, inducing interface uniform film formation by using triangular wave, applying constant pressure to promote exhaust, and finally applying sine wave to promote electrolyte uniform distribution.

The present application relates to the field of radar signal processing, and particularly relates to a multi-cycle triangular wave clustering frequency estimation buoy LFM ranging method. The method comprises: transmitting a multi-cycle triangular wave modulated LFM signal, mixing the echo signal with a local reference signal to obtain a multi-cycle difference frequency signal; performing nonlinear transformation on the difference frequency signal to eliminate the sign flip effect caused by the up and down frequency of the triangular wave; performing time-frequency analysis on the nonlinear transformed signal to obtain time-frequency spectrum characteristics; using a clustering algorithm to perform clustering analysis on the time-frequency spectrum characteristics, extracting stable frequency components from the clustering results; and calculating the target distance according to the frequency components. The present application effectively solves the problems of unstable frequency estimation and enhanced spectral sidelobes under low signal-to-noise ratio conditions by multi-cycle signal accumulation, nonlinear transformation to eliminate sign flip, time-frequency analysis and clustering algorithm to extract stable frequency components, significantly improving the ranging accuracy and stability.

This invention relates to the field of audio signal processing technology, and particularly to an S-shaped gain gradation control method based on triangular wave integration. The method includes: acquiring audio gain gradation control parameters; generating a synchronization step pulse based on the transition time parameter in the audio gain gradation control parameters; performing linear counting under the action of a direction control signal, outputting a linear count value containing control bits and data bits, pausing counting when the count reaches the boundary value corresponding to the gain target boundary parameter in the parameters; performing corresponding bit operations on the data bits of the same group of linear count values ​​and outputting the data bit operation result, which is then converted into a digital triangular wave signal via triangular wave mapping; performing directional integration on the digital triangular wave signal according to the direction control signal, and outputting a gain adjustment signal; blocking the synchronization step pulse when the count reaches the set boundary value, and latching the gain adjustment signal. This scheme eliminates pop sounds by mapping linear count values ​​to triangular waves using XOR logic and integrating them.

The application provides a radar imaging method and device based on a triangular wave, obtains original echo data of completely symmetrical up-chirp and down-chirp in a triangular wave period, and respectively extracts up-wave data sequence and down-wave data sequence; respectively performs dynamic imaging processing on the up-wave data sequence and the down-wave data sequence, and obtains corresponding up-wave images and down-wave images; establishes a phase relationship according to the up-wave images and the down-wave images, restores TDMA ambiguity, and obtains a real target speed; and performs phase alignment on the up-wave images and the down-wave images based on the real target speed, and obtains a final target image. The maximum non-ambiguous speed of a single channel due to polling is recovered first, and then the up-wave and down-wave phase relationship of the triangular wave is used to further expand the speed range; meanwhile, the ambiguity is resolved according to the fixed phase relationship between the up-wave and the down-wave, and the single chirp is no longer excessively dependent on being designed to be as short as possible, and is more suitable for use of an engineering system under constraints of ranging resolution, signal-to-noise ratio, sampling rate and hardware resources.

This invention discloses a plasma density sampling system. A power conversion module converts a first voltage signal input from a power supply module into a second voltage signal with a predetermined peak value. A triangular wave conversion module converts the second voltage signal into a triangular wave driving voltage signal for driving a probe, and drives the probe to generate a detection current. The probe's detection current is then converted into a voltage signal, which is output to a signal conditioning module. The signal conditioning module conditions the voltage signal converted from the detection current into a third voltage signal of 1-5V. An acquisition and frequency adjustment module samples the third voltage signal according to a set sampling frequency to obtain a sampling current signal. This invention also discloses a plasma density sampling method that adjusts the sampling frequency based on the detection current. This invention is applied to plasma density measurement in real flight environments and can adapt to 10e... 10 cm ‑3 up to 10e 14 cm ‑3 Measurement of plasma density within a range.

The application discloses a voltage source type converter DC voltage sensorless closed-loop control method and device, and belongs to the technical field of converter control, which comprises the following steps: constructing a wide-frequency excitation sample composed of square waves, triangular waves and quadratic function waves; combining a converter topology and a pulse width modulation principle to establish a DC voltage expression; transforming an alternating current to obtain eight-dimensional input variables; training a fitting model by using a mechanism and data fusion least square method; and reconstructing a DC voltage in real time based on operation data. A damping coefficient is introduced into a control loop, so that a system is reduced from a typical II type to a I type, and dynamic anti-interference performance is optimized. A reconstructed voltage is used to replace a sampling signal of a fault DC voltage sensor, so that sensorless closed-loop fault-tolerant control is realized. The voltage source type converter DC voltage sensorless closed-loop control method and device can guarantee stable operation of the converter under a DC voltage sensor failure condition, and improve reliability of a grid-connected system.

The application belongs to the technical field of medical instrument analysis system, and discloses a full-automatic blood culture instrument and a detection and analysis method thereof.The method collects original second harmonic signals and corresponding laser scanning triangular waves through tunable semiconductor laser absorption spectroscopy (TDLAS), filters the original signals, normalizes the original second harmonic signals using the triangular waves, smoothes the normalized values to obtain CO2 change curves, constructs microorganism growth related curves, and judges the microorganism growth according to the growth rate, inflection point and concentration change trend.The application provides a complete gas pressure inversion model, a spectrum signal stabilization algorithm and a bacteria growth characteristic discrimination logic, so that blood bacteria detection can be realized in real time with high sensitivity and high timeliness without destroying the culture closed environment and without using additional batches of disposable culture bottles.

According to various embodiments of the present invention, an insulation monitoring device includes an impedance disposed between a power line and a system ground. The insulation monitoring device includes: a signal generation circuit for applying a triangular wave signal to the power line via a signal measurement circuit; a signal measurement circuit for measuring a voltage difference across a detection resistor or a current flowing through the detection resistor when the triangular wave signal is applied to the impedance; and a control circuit for acquiring an impedance value of the impedance based on at least one of the voltage difference and the current, and monitoring the impedance value.

A clock signal generator, including: an in-phase clock generating circuit, comprising: an inverter configured to invert an input clock signal to generate a substantially square wave voltage; and a first transimpedance amplifier (TIA) configured to generate an in-phase clock signal based on the substantially square wave voltage; and a quadrature-phase clock generating circuit comprising: a load capacitor; a switched integrator configured to integrate the input clock signal to generate a substantially triangular wave voltage across the load capacitor; and a second transimpedance amplifier (TIA) configured to generate a quadrature-phase clock signal based on the substantially triangular wave voltage.

The present application relates to a class-D amplifier. The class-D amplifier includes a loop filter configured to receive first and second feedback signals, and receive first and second input signals through first and second resistors, respectively, and filter the first and second input signals and the first and second feedback signals to generate first and second filtered signals; a triangle wave generator configured to generate a triangle wave based on first and second reference voltages; first and second comparators configured to compare the first and second filtered signals to the triangle wave to generate first and second pulse width modulation signals, respectively; first and second driver circuits configured to generate first and second output signals based on the first and second pulse width modulation signals, respectively; and a reference voltage generator circuit configured to generate the first and second reference voltages based on a control signal.

The application provides a spread spectrum circuit, a power supply system, a chip and an electronic device. The closed loop controlled oscillator comprises a closed loop control module and a voltage controlled oscillator for generating a first clock signal; the spread spectrum circuit comprises a spread spectrum module and a frequency divider for generating a second clock signal with a preset frequency according to the first clock signal; the input end of the spread spectrum module is coupled to the output end of the frequency divider, the output end of the spread spectrum module is coupled to the first input end of the closed loop control module, the output end of the closed loop control module is coupled to the input end of the voltage controlled oscillator, the output end of the voltage controlled oscillator is coupled to the second input end of the closed loop control module and the input end of the frequency divider; the spread spectrum module generates a triangular wave signal according to the second clock signal, and the closed loop control module generates a control signal for driving the oscillator according to the first clock signal and the triangular wave signal. The application can achieve linear frequency modulation effect without complex digital modules, the spectrum energy is uniform, the chip design can be effectively simplified, and the cost can be significantly reduced.

This invention discloses a dynamic three-frequency chord and pseudo-random pulse composite anti-recording interference device based on dual-channel DDS functionality. Using the Zynq-7020 chip as its core, it comprises a control unit, a signal generation unit, a power amplification unit, and a human-machine interface unit. The signal generation unit is a dual-channel DDS module: the first channel generates three sets of cyclic triangular wave signals with an arithmetic frequency of 200Hz and a base frequency of 23kHz-23.5kHz; the second channel generates multi-dimensional pseudo-random triangular wave pulse signals of 23kHz-28kHz. The Zynq-7020 chip's PS and PL are configured via AXI-Lite communication. After the two signals are amplified by the power amplification unit, low-frequency difference-frequency interference is generated by leveraging the nonlinear distortion of the microphone in the recording device, constructing a highly complex nonlinear interference field within 3-5 meters. This invention offers diverse interference modes, strong noise reduction capabilities, and effectively shields mainstream mobile phones and various recording devices. Furthermore, it features a simple structure, convenient operation, and low power consumption, making it suitable for various scenarios such as confidential meetings and business negotiations.

The application discloses a kind of hypersonic vehicle plasma density on-line diagnosis method, including the current of probe zero position acquisition is obtained to obtain the current of modified probe plasma acquisition;In the current of modified probe plasma acquisition, effective data is selected, and is divided into n sections;The I-V curve of each section data in n section data is obtained;According to I-V curve, electron temperature and saturated ion current are obtained, and then the electron density of n section data is obtained;Edge effect and collision effect correction are carried out to the electron density, and the plasma density of plasma flow field is obtained.The application also discloses a kind of hypersonic vehicle plasma density on-line diagnosis system, including power supply module, power conversion module, triangular wave conversion module, signal conditioning module, acquisition and frequency adjustment module, probe and data processing equipment.The application improves plasma measurement data processing efficiency and accuracy under real environment, and can be used to guide basic theory research, predict model correction and support reliable measurement and control communication research.

A class-D amplifier includes a loop filter configured to receive first and second feedback signals, to receive first and second input signals through first and second resistors respectively, and to filter the first and second input signals and the first and second feedback signals to generate first and second filtered signals; a triangle wave generator configured to generate a triangle wave according to first and second reference voltages; first and second comparators configured to compare the first and second filtered signals with the triangle wave respectively to generate the first and second pulse width modulation (PWM) signals, respectively; first and second driver circuits configured to generate first and second output signals according to the first and second PWM signals, respectively; and a reference voltage generation circuit configured to generate the first and second reference voltages according to a control signal.

This application provides a dual-random frequency dithering circuit and method. The circuit includes: a pseudo-random signal generation module for generating two pseudo-random control signals; a triangular wave generation module; a cooperative modulation module connected between the pseudo-random signal generation module and the triangular wave generation module, used to dynamically modulate at least one operating parameter of the triangular wave generation module according to the pseudo-random control signals, so that the time-domain characteristics of the digital control signal output by the triangular wave generation module have both periodicity and randomness; and a hybrid frequency control module for generating a hybrid control signal according to the pseudo-random control signals and the digital control signals, controlling the frequency of the oscillator to change randomly within a predetermined range to generate a frequency dithering clock signal. This application organically combines triangular wave modulation and random modulation to form a cooperative modulation mechanism, avoiding the periodicity of triangular wave frequency dithering and the uncertainty of random frequency dithering, and can provide excellent EMI suppression effect for automotive-grade DC-DC chips to the greatest extent.

This invention discloses a radio frequency (RF) component circuit system and method for short-range, blind-spot-free detection, comprising: a first signal receiving module, a second signal receiving module, a first signal transmitting module, a second signal transmitting module, a mixer circuit module, a local oscillator synthesis circuit module, and an intermediate frequency (IF) filtering and gain circuit module. This invention employs two separate transmitting and receiving branches, achieving 360° panoramic detection capability for the RF component; it utilizes a phase-locked loop (PLL) circuit to generate a fast triangular wave signal for output to the VCO circuit, avoiding triangular wave harmonic leakage during mixing when an external triangular wave signal is applied, ensuring that the demodulated triangular wave harmonic signal is within the IF signal band; and it employs a low-pass filter circuit, a high-pass filter circuit, and an equalization suppression circuit to perform zero-frequency suppression on the demodulated IF signal, enabling the RF component to have a short-range detection capability of 0m to 3m.

The application provides a digital frequency jitter system, a chip and an electronic device, and relates to the technical field of wireless charging. The system comprises a frequency jitter control register module for storing frequency jitter configuration parameters; a low-frequency frequency jitter control module and a high-frequency frequency jitter control module for determining target low-frequency triangular wave frequency jitter values and target high-frequency frequency jitter values from low-frequency triangular wave frequency jitter values and high-frequency frequency jitter values according to actual carrier cycle numbers; a carrier control module for superimposing the target low-frequency triangular wave frequency jitter values and the target high-frequency frequency jitter values on carrier cycle configuration values, adjusting carrier edge point configuration information based on the obtained actual carrier cycle; and an output control module for outputting a target carrier signal based on the adjusted edge point information and the actual carrier cycle. The system aligns the low-frequency triangular wave frequency jitter values with the half-bit data bit cycle specified in the wireless charging protocol and synchronously aligns the high-frequency frequency jitter values with the low-frequency triangular wave frequency jitter values, thereby ensuring the synchronization of the frequency jitter operation and the FSK data bit cycle and reducing the bit error rate.

The present invention relates to a method for synchronizing the phase of a triangular wave signal with the phase of a reference triangular wave. According to the present invention, the method for synchronizing the phase comprises the steps of: determining whether the period of a triangular wave signal is the same as the period of a reference triangular wave signal; adjusting the period of the triangular wave signal to be the same as the period of the reference triangular wave signal when the period of the triangular wave signal is not the same as the period of the reference triangular wave signal; determining whether a circulating current is generated after adjusting the period; and adjusting the maximum value of the triangular wave signal when the circulating current is generated.

The present application discloses a fast-response switch power supply control circuit and a control method thereof. A triangular wave signal associated with inductor current information is obtained by a triangular wave generation circuit; the triangular wave signal is calculated with an error compensation signal by the capacitor circuit to obtain a first compensation signal; a comparator compares the first compensation signal with an output voltage feedback signal to obtain a comparison result to control the turning-on of the power switch transistor. The present application has the beneficial effects of good loop stability and fast dynamic response of the system without requiring a sampling circuit to sample the inductor current information in the case of using a relatively simple circuit.

This invention relates to the field of switching power supply control technology, and discloses a method and circuit for dual random frequency dithering and adaptive slope compensation in switching power supplies. The method generates a dual-layer independent random sequence based on pseudo-random numbers, and generates a slow random triangular wave frequency dithering signal and a fast random jump frequency dithering signal through layered mapping. The switching cycle duration is obtained through cycle counting and numerical conversion, and the target duty cycle is calculated by combining the input voltage and output voltage reference values. Using the target duty cycle, switching cycle, and system parameters, an adaptive compensation slope value is calculated through a lookup table combined with interpolation or formulas. A digital compensation slope is generated based on the smoothed compensation slope and the cycle synchronization signal. This slope is digitally added to and compared with the inductor current sampling signal to achieve stable LED drive current output. This invention maintains stable output current while effectively suppressing broadband electromagnetic interference, and is suitable for high-reliability applications such as automotive LED drives.

The application provides a control method and device of a three-level converter and electronic equipment, the three-level converter comprising a three-level conversion circuit and a half-bridge circuit, the direct current side of the three-level conversion circuit being connected with the half-bridge circuit; the half-bridge circuit comprising a first switch tube, a second switch tube, a first inductor, an upper split capacitor and a lower split capacitor, the capacitance of the upper split capacitor and the lower split capacitor being different; the control method comprising the following steps: obtaining a first current flowing from the three-level conversion circuit to the connection midpoint of the upper split capacitor and the lower split capacitor; obtaining a first reference current based on the reference voltage and the actual voltage of the direct current bus; obtaining a second reference current based on the voltage average of the lower split capacitor and the reference voltage of the direct current bus; generating a modulation wave based on the first reference current, the second reference current, the current of the first inductor and the first current; and comparing the modulation wave with a triangular wave to generate the driving signal of the first switch tube and the second switch tube.