1158results 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 invention discloses a self-calibration high-resolution PWM (Pulse Width Modulation) signal generating circuit, which belongs to the field of electronic circuits and comprises a PWM signal generating module, a high-resolution module, a calibration module, a register module and an AHB (Advanced High-performance Bus) interface. The PWM signal generation module generates a coarse adjustment PWM signal based on a comparison result of the comparison register and the counter; and the high-resolution module performs fine edge positioning on the coarse adjustment PWM wave to generate a fine adjustment PWM signal. Under the condition that the clock frequency is not changed, the high-resolution module can improve the resolution of the PWM signal. The calibration module has a high-resolution calibration function, and the high-resolution calibration function can avoid the deviation of a delay value caused by the environment and ensure the accuracy and stability of the high-resolution PWM. The register module is responsible for register read-write control. The AHB bus interface part is responsible for processing bus interface signals. The self-calibration high-resolution PWM signal generation circuit has the advantages of being high in precision, high in stability, easy to IP and the like.

A control circuit for a switching converter includes a compensation circuit, a ramp generation circuit, a comparison circuit and a logic circuit. The compensation circuit is configured to generate a compensation signal in response to a feedback signal and a reference signal. The ramp generation circuit is configured to generate a ramp signal. The comparison circuit is configured to provide a comparison signal in response to the compensation signal and the ramp signal. The logic circuit is configured to provide the PWM control signal to the switching converter. The PWM control signal is at a first voltage level when a value of the ramp signal reaches a value of the compensation signal. The PWM control signal is at a second voltage level in response to the clock signal.

Systems and methods to charge a battery using a switch modulator and a shaping circuit comprising at least one switching element. The shaping circuit may be configured to receive an input charge supply from a power supply and the switch modulator may be operably coupled with the at least one switching element. Further, the switch modulator may actuate the at least one switching element at a selected duty cycle such that the shaping circuit produces a shaped charge signal, the selected duty cycle configured to vary within a switch modulator sample period.

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.

Disclosed in the present invention is a state of charge (SOC) balancing method for an energy storage MMC based on capacitor voltage correction, comprising the following steps: acquiring important parameters such as the SOCs of energy storage units and current directions of bridge arms in an energy storage MMC; calculating SOC average values of phase units, of the bridge arms, and of three phases of energy storage units; calculating the inter-phase SOC imbalance degree, the inter-bridge arm SOC imbalance degree, and the inter-submodule SOC imbalance degree, obtaining an inter-phase power deviation, an inter-bridge arm power deviation, and an inter-submodule voltage deviation by means of a proportional controller, and calculating a submodule energy storage power reference value and submodule corrected capacitor voltages; calculating the duty cycle of a switching device in a bidirectional DC / DC converter; and sorting the submodule corrected capacitor voltages, and on the basis of the charging / discharging state of submodule capacitors, determining submodules to be connected. The present invention can realize SOC balancing of energy storage MMCs, and reduces the number of bidirectional DC / DC converter controllers, thereby improving the SOC balancing efficiency and the capacity utilization rate of energy storage units.

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 relates to a heterogeneous neural network acceleration device based on cooperation of a DSP (Digital Signal Processor) and a memristor, which adopts a hybrid computing architecture design of a DSP and memristor cross array, such as dynamic precision switching, a real-time closed-loop feedback mechanism based on a Lyapunov stability theory, a self-adaptive cross-domain quantization module, hardware instruction set optimization and the like. The hybrid architecture has good balance performance and universality, stability is remarkably improved through conductivity monitoring, self-adaptive PWM pulse generation and quantization table updating, a higher signal-to-noise ratio is achieved at lower cost through combination of a self-adaptive cross-domain quantization module and noise reduction, hardware level optimization is achieved through customization of an instruction set, the hybrid architecture is more suitable for an HNN calculation task, and the method is suitable for the HNN calculation task. The energy efficiency ratio and the anti-drifting capability of the HNN acceleration circuit are improved, and the acceleration performance is improved.

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.

A class D amplifier circuit receives an analog audio signal with a first reference voltage as its center level, and outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal. A bias circuit generates a second reference voltage having a voltage level obtained as a division of the first reference voltage and the power supply voltage. A periodic voltage generating circuit of the class D amplifier circuit generates a periodic voltage having a triangle waveform or otherwise a sawtooth waveform having an amplitude that corresponds to the second reference voltage.

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.

The embodiment of the utility model provides a key scanning circuit, an awakening module and input equipment. The key scanning circuit is configured to be connected with a transmitting end of an optical key of the equipment and connected with a main control unit of the equipment; and the key scanning circuit is used for receiving a working mode signal of the main control unit and generating a scanning signal with a corresponding frequency based on the working mode signal so as to periodically drive the transmitting end of the optical key to emit an optical signal. The chip independent of the main control unit is adopted, the state of the optical key is scanned, the equipment is awakened in time, the standby power consumption of the optical key is effectively reduced, and the endurance time of the whole equipment is prolonged.

The embodiment of the invention discloses a PWM signal generation method. The generation method comprises the following steps: determining setting delay time and reset delay time of an nth PWM delay signal, and determining a first comparison result of the setting delay time and a preset clock period and a second comparison result of the reset delay time and the preset clock period, and allocating a first delay time to the delay module and allocating a first comparison threshold to the first comparator according to the first comparison result, and allocating a second delay time to the delay module and allocating a second comparison threshold to the second comparator according to the second comparison result. According to the embodiment of the invention, the method does not need to depend on a high-precision clock chip, can achieve the delay processing of the PWM signal through the fine adjustment operation on a low-cost hardware circuit, can achieve the delay of the duty ratio, can also achieve the delay of the signal period, is higher in time resolution, and is higher in precision. And more accurate and stable PWM signals can be output.

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.

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 discloses a gallium nitride driving circuit which is used for generating driving voltage for driving a gallium nitride transistor. The circuit comprises a gallium nitride switching tube, an upper switching tube, a lower switching tube, a clamping module, an energy collection module, a diode, a capacitor, a clamping and logic driving module and a bias voltage generation module. The gallium nitride switch tube is connected with the drain electrode of the gallium nitride transistor and clamps the drain electrode voltage to a first voltage; the clamping module receives the first voltage and clamps the first voltage to a second voltage; the energy collection module receives the second voltage and the PWM signal and generates a power supply voltage and a stable voltage. The clamping and logic driving module receives a power supply voltage and a PWM signal and generates a pull-down driving signal. The bias voltage generation module receives the stable voltage and the pull-down driving signal and outputs a bias voltage. When the PWM signal is at a high level, the pull-down driving signal is at a low level, the bias voltage is at a high level, and the driving voltage is at a high level; when the PWM signal is at a low level, the pull-down driving signal is at a high level, the bias voltage is at a low level, and the driving voltage is at a low level.

The invention discloses a pulse switch parameter updating method, electronic equipment and a medium. The pulse switch parameter updating method comprises the following steps: setting a switch period reference value; obtaining a current switching period, a first duty ratio of the first PWM signal and a second duty ratio of the second PWM signal; respectively judging a first action and a second action according to a first duty ratio of the first PWM signal and a second duty ratio of the second PWM signal, and setting a first mark position; when the first flag bit is detected, the switching period, the duty ratio of the first PWM signal, the duty ratio of the second PWM signal, the first action corresponding to the first PWM signal and the second action corresponding to the second PWM signal are updated at the next target time point through timing of a cycle timer; wherein the target time point is a time point corresponding to the trough of the triangular carrier of the carrier counter of the PWM wave in the current switching period; and after updating is completed, the first flag bit is set, and the cycle timer is reset.

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 provides a multi-waveform magnetic field generating device for magnetic hyperthermia. The multi-waveform magnetic field generating device comprises a power supply module, a BUCK voltage regulating circuit, a multi-waveform signal generating circuit, a power amplifying circuit, a series resonance inverter circuit, an induction coil, a water cooling module, a temperature acquisition module, a DSP microprocessor and a TFT display screen. The power supply module is combined with BUCK to supply power to the device; the multi-waveform signal generation circuit, the power amplification circuit and the series resonance inverter circuit are used for generating an alternating magnetic field to act on a magnetic medium to generate a heat effect and realize magnetic hyperthermia; the water cooling module is used for reducing the temperature of the induction coil; the temperature acquisition module acquires temperature data of a treatment area and performs output control on the Buck voltage regulation circuit by using the DSP microprocessor so as to regulate the output power of the power amplification circuit powered by the BUCK voltage regulation circuit and realize intelligent temperature control of the magnetofluid; the problems that in the prior art, a magnetic field generation device is single in induction waveform and poor in heat generation effect are solved.

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 discloses an audio power amplifier starting-up sonic boom suppression method based on a sound masking effect, and belongs to the technical field of power amplifiers, and the method comprises the following steps: S1, presetting a voltage reference value for audio detection; s2, correspondingly outputting a suppression signal or a working signal according to the comparison between the input voltage value and the voltage reference value; s3, generating a PWM signal, and connecting the PWM signal to a switch module through an AND gate and a buffer; s4, when the suppression signal is generated, it is judged that the audio input signal has sonic boom at the moment, and the output end of the power amplifier does not generate an impact signal; and when the working signal is generated, the output end of the power amplifier generates an impact signal containing a suppression effect. According to the invention, through input signal threshold detection, the composite sound superposed with the preset switch music signal is generated, and the method has the advantages of solving the bottleneck of response lag during shock-wave suppression of the D-type power amplifier and promoting the D-type power amplifier to be miniaturized.

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.

A circuit for signal transmission, memory, and method for signal transmission are provided. The circuit includes: a signal processing circuit, configured to receive an input first signal, obtain a second signal by processing the first signal in a preset processing manner, and take the second signal as an output signal of the signal processing circuit; and a selection circuit, configured to receive the input first signal, the second signal and a control signal, and take the first signal or the second signal as an output signal of the selection circuit according to the control signal.

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 utility model discloses a touch sensing and heating multiplex circuit and a nursing instrument. The touch sensing and heating multiplex circuit comprises a switch module; a charging and discharging module; the MCU module comprises a multiplexing control end, a transmitting electrode end and a receiving electrode end; the multiplexing control port is connected with the switch module so as to send a high / low level signal to control the on-off state of the switch module; the sending electrode end is connected with the charging and discharging module so as to send high / low level signals; the receiving electrode end is connected with the charging and discharging module to perform potential detection; the induction coil is connected with the switch module and the charging and discharging module, the charging and discharging module charges a formed induction capacitor when the on-off state of the switch module is a first state and the skin is close to the induction coil, and the induction coil serves as a touch induction assembly; the power supply supplies power to the induction coil when the on-off state of the switch module is the second state, and the induction coil serves as a heating assembly. According to the utility model, time division multiplexing of touch sensing and heating functions can be realized.

A controllable lighting device may utilize a controllable impedance circuit to conduct a load current through an LED light source. The controllable impedance circuit may be coupled in series with a first switching device, which may be rendered conductive and non-conductive via a pulse-width modulated signal to adjust an average magnitude of the load current. The controllable lighting device may further comprise a control loop circuit that includes a second switching device. The second switching device may be rendered conductive and non-conductive in coordination with the first switching device to control when a feedback signal is provided to the control loop circuit and used to control the LED light source. The control loop circuit may be characterized by a time constant that is significantly greater than an operating period of the load current.