786results about "Pulse duration/width modulation" patented technology

The invention relates to an output control method and system for a pulse power supply, and the method comprises the following steps: collecting the output voltage waveform of the pulse power supply, and obtaining an output voltage sampling sequence; carrying out wavelet transform decomposition on the voltage waveform characteristic coefficient, and extracting the voltage waveform characteristic coefficient; self-adaptive threshold segmentation is carried out based on the feature coefficient, and pulse edge feature points are identified; generating a waveform compensation parameter sequence through dynamic compensation calculation; modulating a PWM (Pulse Width Modulation) control signal by using the sequence to obtain an optimized PWM waveform sequence; finally, the parameters of the drive circuit are adjusted based on the optimized PWM sequence, stable control over the output voltage waveform is achieved, and the technical problems that a traditional pulse power supply mostly adopts a PWM control strategy with fixed parameters, output fluctuation caused by load abrupt change, temperature drift and device aging factors is difficult to cope with, and waveform distortion is caused are solved.

The utility model provides an insulated gate bipolar transistor driving circuit with adjustable positive and negative voltages, comprising a magnetic isolation module, the input end of which is connected with a driving signal and outputs an isolation driving signal; the input end of the first voltage regulating module is connected with the first positive voltage and outputs a second positive voltage within a first preset range; the input end of the second voltage regulating module is connected with the first negative voltage and outputs a second negative voltage within a second preset range; the push-pull output module is connected between the second positive voltage and the second negative voltage, the control end of the push-pull output module is connected with an isolation driving signal, and the output end of the push-pull output module is connected with the gate pole of the to-be-tested insulated gate bipolar transistor through a gate resistor; and the protection module is controllably connected between the output end of the push-pull output module and the second voltage regulation module under the action of the control signal. The driving circuit has the beneficial effects that the positive and negative voltage output capability can be flexibly adjusted according to debugging requirements, the working condition requirements of different clients are met, and the flexibility and adaptability of the driving circuit are improved.

The utility model provides a high-voltage pulse generating device and a test system. The high-voltage pulse generating device comprises a main control unit, a driving circuit, a pulse control circuit with a wide bandgap semiconductor power device, and an output circuit, the first end of the main control unit is coupled with the first end of the driving circuit, the second end of the driving circuit is coupled with the first end of the pulse control circuit, and the second end of the pulse control circuit is coupled with the output circuit; the main control unit is configured to generate two paths of first PWM (Pulse Width Modulation) signals with dead time control; the two paths of first PWM signals are sent to the driving circuit; and the driving circuit is configured to process the first PWM signal and then drive the pulse control circuit, so that the output circuit generates a high-voltage pulse signal. According to the utility model, the structure is simple, the cost can be greatly reduced, the output pulse speed can be flexibly set, and the CMTI test requirements of different isolated gate drivers can be met.

The invention discloses an ultrasonic transducer series resonant frequency tracking method and an ultrasonic driving power supply, and the tracking method comprises the steps: calculating a current phase difference between a voltage signal and a current signal, determining a phase difference error and an error change rate through the combination of a target phase difference, and determining the resonant state of an ultrasonic transducer according to the comparison of the phase difference error and an error threshold value; if the current driving frequency is in the resonance state, keeping the current driving frequency unchanged; and if in a non-resonant state, correcting the driving frequency through a fuzzy PID algorithm. In order to cope with the sudden change of the load, the tracking method introduces an AI model to identify the load and predict the optimal driving frequency, and then the predicted optimal driving frequency is used as the current driving frequency. According to the invention, the response speed and the adjustment precision in dynamic frequency tracking are improved, and adaptive resonance driving and frequency control of the ultrasonic transducer under variable load and variable working conditions can be realized.

The invention discloses an external ADC synchronous sampling method and device based on microprocessor timer cascade, and relates to the field of microprocessor external ADC high-speed synchronous sampling. The method comprises the following steps: periodically generating an external ADC sampling trigger signal by configuring a first timer; triggering a second timer update event by using an external ADC data ready signal, automatically sending data to ADC peripherals through an SPI interface DMA sending channel, and automatically carrying ADC sampling data to a memory buffer area through an SPI interface DMA receiving channel; continuous and single conversion modes are supported, and the data integrity is ensured by adopting a double-buffering mechanism. And full-link hardware synchronization from sampling triggering to data storage is realized. By implementing the technical scheme provided by the invention, the technical bottleneck of realizing high-speed synchronous sampling on middle and low-end microprocessor platforms without a DMAMUX function is overcome. The MCU interruption frequency and resource occupation are obviously reduced, time sequence jitter caused by software delay is eliminated, and the sampling synchronization precision and the system real-time performance are greatly improved.

The present application provides an all-digital multi-phase DC-DC controller. The digital DC-DC controller includes time-based analog-to-digital converters (ADCs) for converting analog voltage signals into digital-domain signals so as to benefit from gate length scaling without limited by the low voltage swing. Also, the DC-DC controller further includes a digital control circuit and a time-based modulator. The digital control circuit can control the time-based modulator in a digital domain, thereby reducing the affection caused by process, voltage and temperature (PVT) variation. Also, the time-based modulator can adjust the timing of the PWM signals and avoid the performance degradation caused by circuit mismatch. Since the digital control circuit can be fully synthesizable, it allows implementations in all kinds of digital CMOS processes with a small chip area.

A semiconductor device is provided. The semiconductor device includes: an equalizer circuit configured to output a first control signal corresponding to a first bit of original two-bit data and a second control signal corresponding to a second bit of the original two-bit data; and a driver circuit including a plurality of pull-up transistors connected between an output node and a first power node configured to provide a first power supply voltage, and a plurality of pull-down transistors connected between the output node and a second power node configured to provide a second power supply voltage, wherein the second power supply voltage is lower than the first power supply voltage, and the driver circuit is connected to the equalizer circuit in series. The plurality of pull-up transistors includes a first pull-up transistor and a second pull-up transistor connected to each other in parallel, between the first power node and the output node, and a third pull-up transistor and a fourth pull-up transistor connected to each other in series, between the first power node and the output node.

The invention provides a PWM signal generation circuit and a control device. The PWM signal generation circuit comprises a control module, a delay chain module and an edge detection module, wherein the delay chain module and the edge detection module are electrically connected with the control module; the edge detection module is used for receiving an original PWM signal output by the PWM system, detecting the edge of the original PWM signal based on an edge detection instruction, generating an edge indication signal and sending the edge indication signal to the delay chain module; the delay chain module comprises a plurality of delay units and is used for delaying the edge of the original PWM signal by target delay time to generate a target PWM signal; according to the invention, the delay operation is carried out on the original PWM signal at the specified edge through the delay chain module, the target PWM signal with the resolution higher than that of the original PWM signal is obtained, and the high-resolution PWM signal is generated by using the low-frequency clock of the PWM system on the premise of not changing the system work clock period of the PWM system.

A nicotine e-vaping device includes a heater, a power control circuit, and a memory module. The heater element is configured to heat nicotine pre-vapor formulation. The power control circuit is coupled to the heater element through a wire. The power control circuit is configured to apply a pulse width modulated power signal to the heater element through the wire, and to receive information over the wire. The memory module is configured to detect a plurality of pulses in the pulse width modulated power signal, record information based on the detected plurality of pulses, and output the recorded information to the power control circuit via the wire.

The invention belongs to the technical field of radio frequency power sources, and provides a high-frequency pulse hierarchical adaptive learning control method and system, and the method comprises the steps: obtaining a tracking error based on the actual output and the expected output of a reference pulse signal; segmenting the tracking error according to a waveform, and dividing the tracking error into a stable section and a transition section; a differential ILC updating law is adopted for the stationary section and the transition section, and control sequences of the stationary section and the transition section are obtained respectively; detecting the pulse width change of the control sequence, and when the pulse width is prolonged or shortened, performing synchronization on the pulse width extension by adopting an interpolation mode / extraction mode to obtain the control sequence after synchronization processing; and splicing the control sequences of the stationary section and the transition section to obtain a global control sequence. Through a cooperative mechanism of delay compensation, pulse slicing, pulse width synchronization and decoupling learning, the problem that a traditional control method is difficult to ensure quick response and high-precision tracking at the same time in a pulse amplitude and pulse width dynamic change scene is solved.

The invention provides a pulse width modulation (PWM) signal capturing method and device and electronic equipment, and belongs to the technical field of electronic signals.The pulse width modulation (PWM) signal capturing method comprises the steps that when it is detected that the duty ratio of a pulse width modulation (PWM) signal is within an extreme duty ratio range, the PWM signal is captured; predicting an expected arrival time interval of the next expected edge according to a plurality of historical period parameters of the PWM signal in the sliding window; before the expected arrival time interval, the level state of the PWM signal is obtained according to a preset frequency, the synchronous count value of the timer when the expected level state is collected is recorded, and the preset frequency is higher than the timing frequency of the timer; and determining a current period parameter of the PWM signal according to the synchronous count value. The missed capture rate can be reduced when a single-channel timer is adopted to capture a PWM signal.

The invention relates to the technical field of PWM (Pulse Width Modulation), and discloses a method for optimizing double random PWM, which comprises the following steps: randomizing a carrier frequency fc and a pulse position to obtain double random PWM, performing parameter setting on random distribution of the carrier frequency and the pulse position by adopting a Sigmoid function, improving a genetic algorithm by utilizing a particle swarm algorithm, and optimizing the double random PWM. Optimizing a minimum value fmin of a random number of a carrier frequency or a pulse position, a maximum value fmax of the random number of the carrier frequency or the pulse position and a curve transverse adjustment parameter sigma of random number Sigmoid distribution in the double random PWM by adopting an improved genetic particle swarm algorithm; according to the method, harmonic energy is dispersed from frequency and phase dimensions to a wider range through double random PWM, the switching frequency and the harmonic amplitude at the integral multiple of the switching frequency are reduced, random numbers are distributed in a Sigmoid mode, and the carrier frequency and the pulse position can more easily avoid a sensitive area by means of the nonlinear probability density characteristic that samples are more on the two sides and less in the middle, so that the switching efficiency is improved. And EMI peaks caused by extreme parameters in traditional uniform distribution are reduced.

An isolated gate drive circuit and a driver, the isolated gate drive circuit includes signal restoration module, modulation module with first terminal and second terminal, high-pass filter module, and falling edge monitoring module; first pulse signal output from the first and second terminals are rail-to-rail differential pulse signals; When the isolated gate drive circuit restores the pulse width modulation signal, the isolated gate drive circuit monitors the first pulse signals output from the first and second terminals of the modulation module. When the pulse signal in the first pulse signal output from the first terminal or the second terminal of the modulation module is in a falling edge state, the falling edge monitoring module outputs a third pulse signal to the signal restoration module, the signal restoration module can quickly output the restored the pulse width modulation signal, improving the reliability of the isolated gate drive circuit.

According to the light-load current limiting circuit of the switching circuit provided by the embodiment of the invention, the voltage and current conversion module generates the initial error current and the pulse frequency modulation current according to the fixed voltage when the clamping module locks the error voltage to the fixed voltage; the clamping module is used for locking the error voltage received by the voltage-current conversion module to a fixed voltage when the error current is smaller than the first reference current; the trigger signal generation module is used for generating a first trigger signal at a first preset moment and generating a second trigger signal at a second preset moment when the clamping module locks the error voltage received by the voltage and current conversion module to a pulse signal period corresponding to the fixed voltage; and the switch module is connected in a first mode when receiving the first trigger signal and determines a target voltage input to the pulse width modulation module, and the switch module is connected in a second mode when receiving the second trigger signal and the second resistor is connected to an output load of the switch circuit through the switch module.

The invention belongs to the technical field of photoelectric fusion integrated circuits, and particularly discloses a parallel PWM expansion high-precision programmable DAC structure. The adjusting module is used for adjusting the thermo-optical phase shifter according to the received digital control signal; the DAC structure specifically comprises a pulse width modulation signal generator and a current source array, wherein the pulse width modulation signal generator is used for acquiring a low-order code element from the digital control signal to generate a pulse width modulation signal, and sending the pulse width modulation signal to the current source array; wherein the current source array is used for acquiring a high-order code element from the digital control signal to generate a high-order analog signal; a low-order analog signal is generated based on the pulse width modulation signal; and the processor is also used for weighting and accumulating the low-order analog signal and the high-order analog signal to obtain an analog control signal and outputting the analog control signal. The DAC structure is high in precision and simple in structure.

The invention relates to a low-power-consumption high-performance D-type power amplifier modulation method and circuit and a D-type audio power amplifier, and the method comprises the steps: separating a pair of BD mode modulated signals outputted by a PWM modulation module in the D-type audio power amplifier circuit into a common mode component and a differential mode component, and outputting the common mode component and the differential mode component; feeding back the common-mode component and the differential-mode component to a differential input end through a common-mode feedback link and a differential-mode feedback link respectively; wherein the common-mode component and the common-mode feedback link are completely arranged in the chip; the differential mode component and the differential mode feedback link are realized by a power MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) integrated inside the chip or an external power MOSFET; and outputting the differential mode component to a to-be-driven object through the power output stage. According to the method, after two feedback links are separated, in a zero-input mute state, no common-mode signal is sent to an output stage for amplification, and power consumption is not caused at the output stage, so that the overall efficiency is greatly improved; and meanwhile, static bottom noise is almost eliminated.

A pulse-width modulator (401) comprising a pulse generator (402) configured to generate, at a switching frequency, a pulse-width modulated waveform for synthesising an analog waveform, and a clock unit (403) configured to control the switching frequency and to, while the pulse generator (402) is generating a series of pulses that represents a single respective period of the analogue waveform, change the switching frequency such that at least one pulse in every series is generated at a different switching frequency from other pulses in that series.

Disclosed are an electrical stimulation circuit, an electrical stimulation method, an electronic device, and a storage medium, where the electrical stimulation circuit includes: a timer for timing; a pulse width modulator connected to the timer, where a first pulse signal is generated when first trigger time set by the timer is up, and a second pulse signal is generated when second trigger time set by the timer is up; a driving circuit connected to the pulse width modulator, where the first pulse signal outputs a first stimulation current, the second pulse signal outputs a second stimulation current through the driving circuit, and the first stimulation current is opposite to the second stimulation current; and a stimulation electrode connected to the driving circuit, where the stimulation electrode is in contact with a plurality of stimulation positions, and configured for randomly outputting the first stimulation current and the second stimulation current.

The invention provides a multi-phase pulse width modulation method and related equipment for reducing harmonic waves for a class-D power amplifier, and relates to the field of radio and television, and the method comprises the steps: sampling an original audio signal at a preset sampling rate, and obtaining a sine wave audio signal; generating a plurality of triangular wave signals corresponding to the sine wave audio signal according to a preset frequency multiple; performing amplitude comparison on the sampling signal and each triangular wave signal to obtain a pulse width modulation signal corresponding to each triangular wave signal; superposing the plurality of pulse width modulation signals to obtain a superposed signal; and inputting the superposed signal into a D-type power amplifier to obtain a power amplifier output signal after harmonic wave reduction. By implementing the method, the performance requirement on a post-stage low-pass filter can be reduced, so that the harmonic distortion of the output signal is suppressed on the premise of not increasing the cost and complexity of the filter.

The invention provides an integrated multichannel pulse modulation type power switch control technology, and a power switch control device with high integration level and high performance is created through a heterogeneous integration technology, a multichannel PWM (Pulse Width Modulation) architecture and an intelligent protection mechanism. Wafer level packaging (WLP) and flip-chip bonding technologies are adopted, a PWM control chip and a GaN / SiC field effect transistor of a CMOS technology and a driver and a protection circuit of a Bipolar technology are integrated in single surface-mounted packaging, the number of external elements is greatly reduced, the space utilization rate of a circuit board is improved, and the overall size is reduced. By optimizing a multi-layer PCB structure and separating a high-frequency signal path from a power supply network, parasitic inductance is effectively suppressed, and the problem of packaging stress caused by difference of thermal expansion coefficients among heterogeneous processes is relieved.

This application provides a voltage conversion circuit and electronic device, including: a controller, a terminating resistor, a plurality of first resistors, a plurality of second resistors, and a plurality of control switches. The first end of the terminating resistor is grounded; the first resistors are connected in series, and the first end of the first first resistor is connected to the second end of the terminating resistor; the first end of one second resistor is connected to the first end of the first first resistor, and the first end of each of the other second resistors is connected to the second end of the first resistor respectively; the first end of each control switch is connected to the second end of one of the second resistors respectively, and the second end of the control switch is connected to or grounded to a preset reference voltage according to a control signal sent by the controller; one of the plurality of control switches is set as a modulation switch, which is used to receive a modulation signal sent by the controller, and both the modulation switch and the modulation signal are determined based on nonlinear error.

According to the present disclosure there is provided a control circuit for a packaged semiconductor chip rail guide tapper driving means, comprising a control signal generator configured to generate control signals at a control frequency, and a drive module arranged to receive the control signals and output drive signals to the driving means based on the control signals to drive a rail guide tapper to tap a rail guide at a tapping frequency corresponding to the control frequency.

The utility model discloses a DAC signal conversion circuit of a DC motor, and belongs to the technical field of motor driving. The circuit comprises a power supply voltage conversion module, an integration unit, a voltage follower module and an analog voltage output module. The output end of the power supply voltage conversion module is connected with the input end of the integration unit, the output end of the integration unit is connected with the input end of the voltage follower module, and the output end of the voltage follower module is connected with the input end of the analog voltage output module; and the voltage follower module is used for isolating the output end of the integration unit from the input end of the analog voltage output module. The DAC signal conversion circuit of the DC motor provided by the utility model realizes an efficient and accurate conversion process from a PWM signal to an analog voltage signal, significantly improves the level conversion and response speed, can flexibly control the output amplitude and stability of the analog voltage signal, has the advantages of simple structure, low cost, high reliability, etc. The method can be widely applied to various fields.

The invention provides a circuit and method for setting a PWM duty ratio and a power management system. The circuit comprises a comparison module, a logic control module, a digital logic module, a voltage selection module and a PWM generation module. The comparison module comprises a demand voltage generation unit and a comparison unit. The demand voltage generation unit generates demand voltage in a certain scene, the comparison unit compares the demand voltage with voltage provided by the voltage selection module, the logic control module analyzes the comparison result to generate a digital signal, and the digital logic module determines the range of the demand voltage. The logic level signal corresponding to the required voltage is obtained and sent to the PWM generation module, so that the PWM generation module sets the duty ratio, and therefore, the interference of power supply variation and signal noise can be reduced, the control precision of the duty ratio can be improved, the setting of different required duty ratios can be realized by adjusting the external resistor, the design is simple, and the integration level is high.

Provided in the embodiments of the present application are a signal processing method, circuit and chip and an electronic device. The signal processing method comprises: performing PWM modulation on an input signal to obtain a PWM positive signal and a PWM negative signal; and, on the basis of the PWM positive signal and the PWM negative signal, outputting a positive output signal and a negative output signal, wherein in response to the amplitude of the input signal being not equal to 0, the positive output signal and the negative output signal each comprise two pulses in one pulse period. The present solution can reduce the frequency requirements for passive filters processing positive output signals and negative output signals, thereby reducing the cost of signal processing systems.

This application is directed to providing a configurable and scalable load that emulates a dynamic current profile of an electronic system. The load is provided by an electronic device including a control signal interface providing control data, a clock signal interface providing an operating clock signal, a load controller, and a set of load modules. The control data indicate one or more dynamic current characteristics of the load, and are applied by the load controller to generate a plurality of load control signals that are synchronized according to a temporal pattern. Each load module is controlled by a respective load control signal to generate an output signal based on the operating clock signal. The load controller controls the set of load modules to generate respective output signals according to the temporal pattern, allowing the set of load modules to operate jointly to emulate the dynamic current characteristics of the load.

A liquid heating appliance for making a beverage, the liquid heating appliance comprising: a plurality of heating components for heating a liquid, where at least a first of the plurality of heating components is powered using mains power, a power management system, wherein the power management system comprises: a controller, and an energy storage device, wherein the controller is arranged to: control an amount of the mains power applied to the first of the plurality of heating components, control an amount of stored power from the energy storage device to be applied to at least a second of the plurality of heating components, and switch polarity of the voltage of the stored power from the energy storage device to be applied to the second of the plurality of heating components after one or more heating cycles associated with the second of the plurality of heating components.

The invention relates to a DC-DC converter arrangement with at least one DC-DC converter, wherein the DC-DC converter comprises a current regulation and a voltage regulation. For the current regulation, a first component is provided hereby for regulation based on the primary-side current at the DC / DC converter, and a second component is provided for regulation based on the secondary-side current at the DC / DC converter.

Embodiments of the present application provide a resonant frequency locking circuit device, which can be applied to the technical field of integrated circuit chip control, and is specifically applied to resonant frequency locking of a target load. The resonant frequency locking circuit device comprises a self-oscillation loop with a gain greater than or equal to 1, which is composed of a signal generation module, a signal processing module, a control generation module and a signal updating module. The signal generation module is used for performing two-stage integral processing on a current load signal of the target load to generate a two-stage integral signal; the signal processing module is used for performing waveform conversion and phase conversion processing on the two-stage integral signal to generate a current phase shift signal; wherein the current phase shift signal realizes 360° phase shift relative to the current load signal; a first capacitor of the signal generation module is connected in series with the target load, and the other end thereof is connected to an output end of the signal updating module. The present application further provides a control method, equipment, storage medium and program product of the resonant frequency locking circuit device.

The invention discloses a PWM signal generation method, module and related device, and the method comprises the steps: sampling a comparison signal based on a sampling period, judging the size relation between the actual current and instruction current of a motor based on the comparison signal, selecting an upper switch tube of a driver or a lower switch tube of the driver based on a judgment result, and generating a PWM signal according to the upper switch tube or the lower switch tube. And judging whether the turn-on time of the selected switch tube reaches the minimum turn-on time, if so, generating an upper tube control signal and / or a lower tube control signal based on the judgment result, and if not, re-sampling the comparison signal based on the sampling period. According to the PWM signal generation method and module and the related device, only the actual current needs to be compared with the instruction current, and the analog circuit calibration difficulty is smaller. In addition, judgment on the turn-on time and the dead time of the switching tube is introduced, and the use safety of a switching device can be considered.