441results about "Pulse duration/width modulation" patented technology

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 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.

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.

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.

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 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.

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.

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.

A circuit and method for measuring an average current of a solenoid valve, relating to the technical field of automotive electronics. The circuit comprises a solenoid valve (110), a first power supply (120), a sampling resistor, a field effect transistor drive circuit (130), a current acquisition circuit (140), an integrator circuit (150), and an integration reset circuit (160); the field effect transistor drive circuit (130) is used for controlling an on-off state of a first field effect transistor on the basis of a pulse width modulation gating signal; the first power supply (120) is used for providing a drive current for the solenoid valve (110) when the first field effect transistor is in an on state, and the drive current flows through the sampling resistor; the current acquisition circuit (140) is used for sampling voltage signals on two sides of the sampling resistor, and outputting the voltage signals to the integrator circuit (150); the integrator circuit (150) is used for performing integration processing on the voltage signals, and determining an average current of the solenoid valve (110) on the basis of an integration result; and the integration reset circuit (160) is used for performing periodic reset processing on the integrator circuit (150) on the basis of the pulse width modulation gating signal.

The invention discloses an audio amplification system based on phase reversal double-class-D power amplifier low power stress. The audio amplification system comprises a signal receiving and decoding module, an operational amplifier module, a double-group class-D power amplifier module, a filtering output module and a power supply module for supplying power to each module, which are connected with one another, a first operational amplifier unit in the operational amplifier module is configured to perform in-phase amplification on the analog audio signal; the second operational amplifier unit is configured to perform inverting amplification on the input signal; a first D-type power amplifier unit in a double-group D-type power amplifier module receives an in-phase signal and outputs an in-phase PWM (Pulse Width Modulation) power signal, and a second D-type power amplifier unit receives an inverted signal and outputs an inverted PWM power signal; and the first D-type power amplifier unit and the second D-type power amplifier unit work based on driving signals with opposite phases, so that peak current drawn from the power supply module is staggered or complementary in time to reduce instantaneous current stress and voltage fluctuation of the power supply module. The same audio output power is realized through ingenious signal phase management on the premise that the power supply cost is not increased or even reduced.

The invention discloses a ferromagnetic material displacement measurement method and device based on PWM waves and a phase method. The method comprises the steps that two paths of same-frequency PWM square wave signals are generated; applying the excitation signal to the electromagnetic induction probe, and based on the relative displacement between the electromagnetic induction probe and the ferromagnetic material, obtaining an induction signal which is output by the electromagnetic induction probe and whose phase changes with the relative displacement; converting the induction signal into a third PWM square wave signal, wherein the phase of the third PWM square wave signal is related to the phase of the induction signal; performing logic AND operation on the third PWM square wave signal and a reference signal to generate a pulse signal; and filtering the pulse signal to obtain a displacement measurement result proportional to the relative displacement. The single-chip microcomputer is adopted to generate high-frequency PWM waves, the phase method and digital logic processing are combined, magnetic field interference and signal drifting in ferromagnetic material measurement are effectively restrained, high precision and high dynamic response are guaranteed, and meanwhile system complexity and cost are remarkably reduced.

The application discloses a PWM circuit with dynamic adjustment of turn-off time, which is characterized in that the circuit comprises a reference voltage unit, a reference current unit, a turn-off control unit, a turn-on control unit and a logic unit; wherein the reference voltage unit and the reference current unit are used for generating reference voltage and reference current respectively, and are connected to the turn-on control unit at the same time, and through processing of the turn-on control unit, compensation operation of turn-on time of a PWM signal is realized; the turn-off control unit is used for generating turn-off time of the PWM signal; the turn-off control unit and the turn-on control unit are connected with the logic unit respectively to realize output of the PWM signal. The application has simple method and ingenious idea, adopts reference voltage and reference current to perform simple time compensation operation, and thus maximum range control of output voltage is realized through the least circuit structure.

The invention provides a PWM control chip radiation hardening method and a related device, and the method comprises the steps: determining a transmission path of a reference module and an oscillator module of a PWM control chip, carrying out the transient filtering of the transmission path, and obtaining a filtered bias signal; determining a first reference voltage of a reference module of the PWM control chip and a second reference voltage of a pre-step-down module, and judging the first reference voltage and the second reference voltage based on a third reference voltage of an over-temperature protection module to obtain an enable signal after over-temperature protection; monitoring a power path of the PWM control chip to obtain an anti-latch protection signal; and reinforcing the PWM control chip based on the filtered bias signal, the enable signal after over-temperature protection and the anti-latch protection signal to obtain a reinforced PWM control chip. According to the method, the single event effect can be reinforced in multiple dimensions, and the reinforcing effect is remarkably improved, so that the use requirements of most tasks can be met.

This invention relates to a frequency identification circuit for motor driver control, belonging to the field of motor drive control technology. The frequency identification circuit compares frequency signals with corresponding duty cycles of 1% and 99% using two comparators. The first comparator circuit amplifies the output signal of the frequency identification module and inputs it to the non-inverting terminal of the comparator. The second comparator circuit directly inputs the output signal of the frequency identification module to the inverting terminal of the comparator. When the duty cycle is less than 1% or greater than 99%, the corresponding comparator outputs a low level. The signal processing circuit uses the unidirectional conductivity of a diode to perform an OR operation on the two comparison signals. If either signal goes low, the driver enable terminal is pulled low, triggering a protection mode. This invention enables rapid identification and protection against PWM signal anomalies, effectively improving the reliability of protection for motor drivers and electric servos.

The utility model relates to the technical field of H-bridge drive circuits, and discloses a high-reliability H-bridge dead-zone generation circuit, which comprises two AND gates for preventing two MOS (Metal Oxide Semiconductor) transistors on the same side of the circuit from being switched on at the same time; the exclusive-OR gate can distinguish input signal directions and output response control signals; the Schmitt trigger is used for converting the curve waveform into a PWM (Pulse Width Modulation) square wave signal and inhibiting noise and interference in an input signal; the RC time delay circuit is connected with the Schmitt trigger and is used for realizing signal delay; the two AND gates comprise a first AND gate and a second AND gate; the first AND gate and the second AND gate are electrically connected with the exclusive-OR gate, and the exclusive-OR gate and the first AND gate are electrically connected with the Schmitt trigger; according to the utility model, the formation of dead zone time is realized through RC time delay and Schmidt characteristics, the condition of circuit damage caused by simultaneous conduction of the H-bridge drive circuit in the working process is avoided, the hardware cost is lower, and the reliability is higher than the reliability realized by software.

The invention provides a variable frequency digital power supply pulse width modulation controller and a modulation control method. The controller comprises a clock management module used for generating a first clock signal, a second clock signal, a third clock signal and a fourth clock signal; the communication module is used for receiving a proportion parameter, an integral parameter, a differential parameter and a target value sent by the upper computer according to the first clock signal; the AD conversion module is used for acquiring voltage data from the buck circuit according to the second clock signal and converting the voltage data into digital waveform data; the PID control module is used for determining a control quantity based on an incremental PID compensation algorithm; the DDS generation module is used for generating digital waveform data with a specific duty ratio according to the fourth clock signal and the control quantity; and the DA conversion module is used for converting the digital waveform data with the specific duty ratio into an analog signal according to the third clock signal and sending the analog signal to the buck circuit. According to the technical scheme provided by the invention, the problem that the control accuracy is limited by the chip performance in the prior art is solved.

One end of a charging resistor R1 is connected with the positive electrode of a main high-voltage power supply E1, the other end of the charging resistor R1 is connected with the positive electrode of a Bouncer power supply E2, one end of a load RL is connected with the negative electrode of the E1 through a main modulation switch K1, the other end of the load RL is connected with the negative electrode of the E2, a main energy storage capacitor C1 is connected with the E1 in parallel, and the other end of the load RL is connected with the negative electrode of the Bouncer power supply E2. The positive electrode of the E1 is connected with the negative electrode of the E2 through the power change-over switch 1 and the capacitor array Ca, the negative electrode of the diode D is connected with the positive electrode of the E1, the positive electrode of the diode D is connected with the negative electrode of the E2 through the power change-over switch 2 and the inductor array La, the Bouncer modulation switch K2 is connected with the diode D in parallel, and the pulse width instruction and sensing unit is connected with the load RL in parallel to form the pulse width self-adaptive high-voltage modulator. Wherein the power change-over switch 1, the capacitor array Ca, the power change-over switch 2 and the inductor array La form a reconfigurable Bouncer module.

The invention discloses a temperature isolation sampling circuit, and relates to the field of electronic circuit design, and the circuit comprises a triangular wave circuit which generates a triangular wave with a fixed period according to a threshold value comparison result in a capacitor charging and discharging mode; the temperature sampling circuit is used for comparing the sampling voltage which is output by the thermistor voltage division circuit and changes along with the temperature with the triangular wave and outputting a PWM (Pulse Width Modulation) square wave signal of which the duty ratio changes along with the temperature; and configuring an optocoupler device to work in a switching state based on a non-linear region, and transmitting the PWM square wave signal to an isolation output circuit at a low-voltage side to realize electrical isolation transmission. The device supports electrical isolation and adapts to high-voltage occasions, and the isolation voltage range depends on selected isolation elements; according to the invention, the PWM is used for transmitting the temperature signal, when the temperature signal is interfered by an electromagnetic environment, the influence on the level amplitude does not change the duty ratio, and in addition, the cost of the device is also reduced.

This invention provides a circuit and method for improving the resolution of a PWM signal, comprising at least a PWM signal generation module, a calibration module, and a resolution adjustment module. The PWM signal generation module generates a PWM signal based on a counting clock. The resolution adjustment module, connected to the PWM signal generation module, extends the period of the PWM signal based on a period adjustment value to generate a period-extended PWM signal, thereby improving the resolution of the PWM signal. The duty cycle of the PWM signal is controlled based on an edge delay value. The calibration module, connected to the resolution adjustment module, calibrates the edge delay of the PWM signal based on the clock signal. Without changing the counting clock, the resolution of the PWM signal is extended through algorithmic control. The operation is convenient, and the duty cycle and phase of the PWM signal are adjusted through edge adjustment. The structure is simple and easy to modularly implement.

A system uses pulse width modulation (PWM) to control the power demand of an equipment. The system receives a thermostat setting for controlling the equipment. The system provides output of the controller to a pulse width modulator. The pulse width modulator causes the signal provided as input to the equipment to be turned off for a portion of a time interval. The portion of cycle during which the signal is turned off is determined based on a duty cycle of the pulse width modulator. The system provides the controller output modulated by the pulse width modulator as input to the equipment. The modulated output of the controlled causes the demand of the equipment to decrease.

The utility model discloses an AC charging pile CP signal generating circuit, comprising a level conversion module and a push-pull output module, the level conversion module is used for converting a PWM signal output by an IO port of an MCU into a + / -12V CP signal, and the push-pull output module is connected to the level conversion module and is used for driving high and low level switching of the CP signal. The level conversion module comprises a resistor R1, the left end of the resistor R1 is connected with PWM signals output by an IO port of the MCU, the right end of the resistor R1 is connected with base electrodes of triodes Q2 and Q3, emitting electrodes of the triodes Q2 and Q3 are connected and connected with the lower end of a resistor R2 and the upper end of a resistor R3, the lower end of the resistor R2 is connected with the upper end of the resistor R3, the upper end of the resistor R2 is connected with a + 3.3 V power source, the lower end of the resistor R3 is grounded, and the lower end of the resistor R3 is grounded. The circuit provided by the utility model is simple, and the cost is lower.

A switching converter is presented. The switching converter has a high side power switch coupled to a low side power switch at a switching node, a driver and a timing circuit. The driver generates a drive signal having a on-time to drive the high side power switch. The timing circuit generates a control signal to adjust the on-time during a load transient period.

An actuator driving device includes a driving coil that generates a driving force with first and second voltages; and a control unit, which sets one of the first and second voltages to a first pulse, sets the other one to a second pulse, and performs at least one of: a first control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that a pulse width of ON time of the second pulse is within a pulse width of ON time of the first pulse; and a second control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that the pulse width of the first pulse in ON time is within the pulse width of the second pulse in ON time.