1979 results about "Duty cycle" patented technology

The invention discloses a buck-boost circuit-based mppt charging current backflow prevention control method, and relates to the technical field of switching power supplies, and the method comprises the steps: collecting a photovoltaic input voltage, a battery output voltage, and an inductive current flowing through an inductor; the current input power is calculated based on the photovoltaic input voltage and the inductive current, and the reference voltage is dynamically adjusted through an MPPT loop algorithm; pI voltage loop operation is carried out on the output voltage and the adjusted reference voltage, and expected charging current is generated; pI current loop operation is carried out on the expected charging current and the inductive current sampling value after proportionality coefficient adjustment, and a PWM duty ratio control signal is output to adjust the driving states of the four switching tubes; when the judgment circuit is in an intermittent conduction mode and meets critical conditions, a driving signal of the fourth switching tube is shielded, and only a body diode realizes a current path to prevent reverse flow of current; the battery current is effectively prevented from flowing backwards, and the system safety and the energy utilization efficiency are improved.

A reconfigurable flying capacitor multilevel input stage accepts a wide range of input voltages. The input stage divides and inverts a DC input voltage. Generally, output voltage regulation is achieved by adjusting the power switches' duty ratio in the input stage for non-resonant converters and by adjusting the switching frequency for resonant converters.

A four wire-to-two wire lamp control signal transmission method includes: level states of lamp control signals in a four-wire system being synchronously sampled within a preset sampling period, a preset converted signal corresponding to control information carried by the level states of the lamp control signals being generated and encoded to obtain a coded signal superposed onto integrated electric power of the four-wire system to form composite electric power transmitted by a two-wire system to drive a load. Lamp control signal transmission can be achieved without sampling lamp control signals within a complete period. The level states of the lamp control signals are transmitted in the form of the preset converted signal, such that the data transmission quantity can be reduced, and the signals can be transmitted approximately synchronously, solving the problem that a lamp fails to be driven in case of a low duty cycle of lamp control signals.

The invention relates to the field of intelligent control of electromagnetic appliances, and provides a control method and system for online fault diagnosis of a magnetic latching relay, and the method comprises the steps: responding to an external control instruction, collecting real-time bus voltage and real-time environment temperature data, constructing environment state characteristics through a magnetothermal coupling algorithm, and generating an initial PWM drive duty ratio; pulse modulation voltage is loaded, a current sampling sequence is collected, a current change rate sequence is obtained through moving average filtering and electromechanical coupling decoupling, extreme value searching is executed to extract counter electromotive force distortion characteristics, and a dynamic current sequential sequence is generated; a fusion input tensor is constructed, armature state probability distribution is output through a gating circulation unit, and a real-time energy compensation instruction is generated in a displacement interval before closing; and according to the real-time energy compensation instruction, respectively generating an enhanced driving waveform, a delayed driving waveform or a vibration driving waveform. According to the method, multi-mode physical characteristic perception and depth time sequence deduction are fused, and online fault diagnosis and active intervention closed loop of the magnetic latching relay are realized.

The invention relates to the technical field of electric tool control, in particular to a motor control method of a target electric tool and a motor control circuit executing the motor control method, and the method comprises the steps: obtaining peak current at a detection resistor and a current PWM signal duty ratio, calculating real-time average current according to the peak current and the current PWM signal duty ratio, and comparing the real-time average current with an average current threshold value; and adjusting the duty ratio of the PWM signal according to the result, and outputting the PWM signal to drive the motor according to the adjusted duty ratio. By dynamically adjusting the duty ratio, the stability and safety of the electric tool under high load are effectively improved, the operation experience is optimized, the hardware upgrading requirement can be met, and the use bottleneck is broken through.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

A four wire-to-two wire lamp control method includes: inputting R, G and B lamp control signals are to corresponding oscillators which are controlled to generate R, G and B oscillation signals; the three oscillation signals being amplified and then coupled into a composite signal which is superposed onto integrated electric power to obtain composite electric power that is transmitted by a two-wire system transmission module. In this way, transformation from a four-wire lamp system to a two-wire lamp system is realized. The composite signal and power are synchronously transmitted in the two-wire system, such that the system can approximately synchronously transmit the composite signal at a low delay, and the integrated electric power can still be transmitted continuously in case of a low duty cycle of the lamp control signals, thus satisfying the requirement for driving power of a lamp.

The invention provides an electric blanket heating wire state judgment method and system, a medium and a product, and relates to the technical field of safety monitoring. In the method, a control processing unit firstly samples at a first preset frequency and calculates a signal change rate; and when the signal change rate value exceeds the standard rate threshold value, the control processing unit judges that the electric blanket is in a suspected heat accumulation state, and at the moment, the output power of the heating wire is controlled to be reduced to a preset duty ratio. Then, the control processing unit adopts a second preset frequency to collect signals and filter the signals, extracts signal values at the first moment and the second moment, and calculates the characteristic value of the thermal attenuation trend; and finally, the control processing unit realizes the distinguishing between the local wire twisting state and the folding state based on the deviation degree of the characteristic value and the standard thermal attenuation characteristic value. According to the method, the technical problem that the high-temperature cause cannot be distinguished only through the instantaneous temperature is relieved, and accurate recognition of the twisted wire fault and the folding working condition is achieved.

The utility model provides a multichannel staggered sampling SPAD module which is arranged in a laser radar and serves as a receiving module of a machine radar, an MCU is arranged in a laser tool, the MCU is provided with an MCU interface, and the multichannel staggered sampling SPAD module comprises an SPAD unit, a TDC circuit array, a signal processing circuit and a coding circuit; wherein the work cycles of the TDC circuits in the TDC circuit array are sequentially arranged in a staggered manner, so that time of the SPAD units is sampled in a staggered manner, a delay chain is formed, the TDC circuit array can output a second value once every a fixed time length, and the fixed time length is smaller than the work cycle of one TDC circuit. After the technical scheme is adopted, the upper limit of the signal transmission rate can be greatly improved, so that the sampling efficiency is improved, and stronger scanning performance is realized.

The invention relates to the technical field of electric energy storage systems, and discloses an electric energy storage system hierarchical cooperative control method based on source-load-storage dynamic matching, and the method comprises the steps: obtaining a common connection point voltage sampling sequence, and calculating a second-order change rate; collecting the first-order change rate of the output current of the energy storage converter and determining a polarization constraint coefficient; switching a control mode according to a second-order change rate magnitude and a polarization constraint coefficient symbol, and utilizing a dynamic damping factor to constrain a duty ratio to adjust a step length; the dynamic damping factor is adjusted and increased when the polarization constraint coefficient exceeds a threshold value under the excitation and transformation state, so that the change rate of the output current is within the charge diffusion safety domain of the storage medium, dynamic damping is guided to implement asymmetric constraint through cooperation of trend pre-judgment and polarization stress identification, the output current is made to adapt to the charge diffusion limit, the switching frequency of the converter is reduced, and the stability of the converter is improved. Active substance precipitation is inhibited; and the total throughput of the equipment in the full life cycle is improved.

The invention relates to a red light therapeutic instrument real-time calibration method based on multi-modal data fusion, which comprises the following steps: firstly, collecting data such as optical power, target surface temperature, internal temperature, reflection spectrum and light source-target surface distance in a time window, and unifying time base alignment; performing anomaly elimination, de-noising and normalization on each modal data, and constructing a standardized data matrix; extracting multi-modal features through power spectral density, wavelet packet decomposition, exponential moving average and Kalman filtering, inputting the multi-modal features into a fusion network containing a modal special encoder and a cross-modal attention unit, and generating a red light treatment state vector; the driving current, the pulse width, the duty ratio, the emission angle and the aging compensation factor are solved in real time through constrained least square optimization and are issued to the driving control module, and the red light source is smoothly adjusted in a soft start mode; the system monitors the output power, calibration is completed if the output power meets a threshold value, and otherwise, the next iteration is started. According to the method, power closed-loop correction can be realized, and dose consistency and thermal safety are improved.

The invention relates to the technical field of non-electrical variable control or regulation systems, and discloses an unsteady-state pipe network environment-oriented water purification tail end flow velocity self-adaptive regulation system, which comprises an input state sensing unit, a tail end response monitoring unit, a flow resistance modulation execution unit and a self-adaptive control unit, the system utilizes an adaptive control unit to address a basic driving duty ratio in a preset pressure-flow characteristic map, executes high-frequency flutter injection logic, generates a zero-mean flutter component with the frequency higher than the mechanical cut-off frequency of an execution unit, and superposes the zero-mean flutter component to the basic driving duty ratio to generate a final driving waveform. The flutter amplitude follows an adjusting strategy which is negatively related to the basic driving duty ratio, the contact friction state of an executing mechanism is maintained to be dynamic friction through flutter injection and amplitude dynamic adjustment, on the premise that high-cost hardware is not increased, a static friction dead zone of an electromagnetic valve is eliminated, and non-lagging response to a tiny feedforward instruction is achieved.

Systems, apparatus, articles of manufacture, and methods are disclosed to charge an energy storage device on a vehicle. The system includes instructions to detect direct current or alternating current on or at an input terminal of a vehicle electrical system, the input terminal to receive electrical energy to charge the energy storage device on the vehicle; based on detection of direct current, generate a first pilot signal that includes a first pulse width modulated signal associated with a first mode including a first duty cycle range; based on detection of alternating current, generate a second pilot signal that includes a second pulse width modulated signal associated with a second mode including a second duty cycle range, wherein the first duty cycle range is lower than the second duty cycle range; and charge the energy storage device based on detection of the first pilot signal or the second pilot signal.

The invention is suitable for the technical field of flexible power distribution of a power system, and discloses a modular multilevel converter multi-objective optimization method, system and device based on model predictive control and space vector modulation, and a medium. Obtaining an output current reference value and a circulating current reference value; obtaining a reference voltage vector based on the output voltage reference value, and screening out a plurality of groups of redundant voltage vector sequences through a space vector diagram; performing performance evaluation through rolling optimization by combining each redundant voltage vector sequence with a multi-target cost function to obtain an optimal voltage vector sequence; and on the basis of the optimal voltage vector sequence and the corresponding duty ratio, a switching signal for driving each sub-module switching device of the MMC is generated, and multi-target cooperative control is realized. The three targets of reference output current tracking, circulating current suppression and sub-module capacitor voltage balance are met, and the dynamic response capability, efficiency and reliability of MMC system operation are comprehensively improved.

The invention discloses a narrow pulse suppression method and device for dynamic adjustment of dead time, a medium and a controller, and the method comprises the steps: presetting the dead time of M periods in the future according to the real-time state of a motor and the dead time and current change rate of the first N periods, and outputting a working condition label at the same time, N and M being positive integers; determining target dead zone time Td according to the working condition label and the dead zone time of the M periods in the future; determining a dead zone time ratio Dd according to the target dead zone time Td, constructing an interval section of a PWM signal according to the dead zone time ratio Dd and a narrow pulse time ratio Dp, and constructing an upper bridge arm duty ratio function Dt and a lower bridge arm duty ratio function Db corresponding to each interval section according to the dead zone time ratio Dd and a duty ratio instruction Dm of the PWM signal; according to the interval section where the duty ratio instruction Dm of the PWM signal is located, a duty ratio function of the corresponding interval section is called, and a target PWM signal is output.

The invention discloses a fault signal dual-mode output method of a magnetic latching relay, particularly relates to the technical field of relay control, and is used for solving the problem of low mode switching efficiency caused by an existing physical jumper mechanism. The current mechanical state of the relay is detected by receiving a remote dual-mode switching instruction; applying a driving voltage sequence corresponding to the target mode according to the state; based on the iron core residual magnetism intensity and the dynamic margin of a target mode nominal value, judging and generating a driving enabling or degaussing trigger signal; when a driving enable signal is responded, the lag time difference between the voltage rising edge and the magnetic flux jump starting point is captured in real time, and the eddy current loss characterization quantity is generated by combining the product integration of the current differential and the temperature rise; adjusting the rising slope and the duty ratio of the driving voltage sequence according to the lag time difference and the over-limit condition of the eddy-current loss characterization quantity; and finally, the matching between an execution result and a target mode identifier is verified by controlling a coil current response waveform, and the continuous holding mode and the instantaneous pulse mode are remotely and reliably switched.

The invention relates to the technical field of LED display screen driving parameter adjustment, in particular to an LED display screen driving parameter adjustment method and system, and the method comprises the following steps: continuously collecting the operation parameters of each local area of a display screen; calculating the accumulated heat pressure of each local area in real time; when the accumulated heat pressure of the local area is equal to or greater than an early warning threshold value, identifying that the local area is an overheating risk area; the driving parameters of the overheating risk area are adjusted, the adjustment comprises reduction of the peak driving current of the LED lamp beads in the local area or adjustment of the pulse width modulation duty ratio of the peak driving current of the LED lamp beads in the local area, and therefore the instantaneous thermal load of the local area is reduced; and when the actual energy consumption is increased beyond the energy consumption standard, the driving strategy of the local area is optimized by combining the data of the accumulated heat pressure of the local area. The driving parameters are monitored in real time and dynamically adjusted, and energy consumption is optimized, so that the service life of the display screen is prolonged, and the operation stability is improved.

The application discloses a display panel driving method, a driving device and a readable storage medium, and relates to the technical field of display, which is characterized in that: an initial response square wave signal is converted based on a current display temperature to obtain a target response square wave signal; a target duty cycle in the target response square wave signal is used to determine a calling requirement, so as to determine a response duration corresponding to a normal output display picture of a liquid crystal display device at the current display temperature; a target response duration parameter table meeting the calling requirement is called; and the display panel at the current display temperature is driven according to the target response duration parameter table, so that the reaction speed of various pixel points to an input display signal at various temperatures is effectively accelerated, and the adverse situation that an animation picture is still blurred and ghosted due to the fact that different temperatures cannot be considered is avoided.

The invention relates to the technical field of fan monitoring, in particular to a BMC (Baseboard Management Controller)-based fan state monitoring method and system. Demand level and energy efficiency modeling; matching coupling judgment is abnormal; carrying out abnormal mechanism cross positioning; performing combined construction of trend portraits; and outputting classification abnormity prompts. According to the invention, on the basis of a collaborative acquisition and hierarchical coupling analysis mechanism of BMC multi-source operation parameters, parameters such as a complete machine load rate, power supply input power, a fan rotating speed, a PWM duty ratio, a motor driving current, an air inlet and exhaust speed and a key heating device temperature are brought into a unified energy efficiency response relation set for modeling and analysis; the sensitivity, the accuracy and the interpretability of abnormal recognition are greatly improved, and the problems that due to the fact that only a single temperature parameter and fault triggering type control are relied on, fan performance degradation is recognized in time, the precision is low, and the response speed is low are effectively solved.

An inductor-inductor-capacitor (LLC) converter may include a control system that holds a duty cycle of control signals at a desired ratio, such as 50%. The control system may include a counter that is configured to count up and down and is further configured to generate event signals that are received at the inputs of a latch. An event signal may cause and output value of the latch to change from high to low or vice versa. There may be further circuits to add delay and / or inversion to generate multiple control signals from the output of the latch. Furthermore, the counter may be configured to switch from counting up to counting down in response to a comparator output.

The invention relates to the technical field of power distribution cabinet protection, and discloses a power distribution cabinet safety protection and alarm system. The system comprises an operation parameter acquisition module, a dynamic constraint optimization module, a waveform reconstruction module, a pulse adjustment module and a phase synchronization module. The operation parameter acquisition module acquires electrical operation parameters and environment state parameters in real time; the dynamic constraint optimization module divides a fault risk grade interval, defines an action parameter range of a protection actuator and generates a protection action instruction; the waveform reconstruction module combines the opening and closing time sequence requirements of the circuit breaker and real-time load fluctuation to generate an optimized driving pulse sequence; the pulse adjusting module corrects the pulse width and the duty ratio based on the protection action instruction; and the phase synchronization module corrects the trigger phase offset, so that the opening and closing actions of the circuit breaker are synchronized with the fault risk level. The system achieves the comprehensive monitoring and precise protection of the power distribution cabinet, and improves the operation safety and stability.

The invention discloses a virtual impedance compensation-based active-disturbance-rejection control method for a dual-active-bridge converter, and the method comprises the following steps: firstly designing a virtual impedance compensation strategy, connecting an equivalent virtual conductor in parallel with an output capacitor, converting the equivalent virtual conductor into a duty ratio injection amount, and achieving the active counteracting of the negative impedance of a constant-power load and the reconstruction of the damping of a port; an unstable pole of the right half plane is made to move back to the left half plane, and extra power loss is not introduced; an active disturbance rejection control strategy based on virtual impedance compensation is designed, residual uncertainty after virtual impedance compensation is uniformly regarded as total disturbance online observation and feedforward offset, and therefore rapid and smooth voltage tracking is kept under parameter perturbation and external disturbance. Under the working conditions of voltage reference step and load abrupt change, the improved active disturbance rejection control strategy realizes the effects of no overshoot, shortest setting time and minimum oscillation by enhancing disturbance observation and virtual impedance compensation, and has better damping and disturbance rejection performance.

The invention discloses a multi-channel multi-color-temperature intelligent light source system for consistency calibration of a camera module and an optimization method, and the calibration system generates PWM signals through an STM32F103ZET6 main control unit of a light source controller to control the light output of each group of cold and warm LEDs so as to provide a stable and adjustable illumination environment; measuring reference brightness and chromaticity parameters of cold light and warm light of each group of LEDs, setting a target brightness value and a color temperature value, and converting the target brightness value and the color temperature value into target chromaticity coordinates; the initial PWM duty ratio of the cold and warm light LED is calculated, a piecewise polynomial nonlinear compensation algorithm is adopted to correct the duty ratio, and the LED is driven to output mixed light meeting the target brightness and color temperature; collecting a large amount of brightness and color temperature data by cyclically and gradually adjusting the duty ratio, and generating an error thermodynamic diagram; and the compensation model coefficient is optimized and updated according to error analysis, so that the light source output keeps high-precision consistency in a full range. Compared with the prior art, the method has the advantages that the brightness and color temperature consistency of the light source can be automatically calibrated and continuously optimized, the accuracy and stability of OTP burning calibration of the camera module are greatly improved, and the production test efficiency and the product imaging quality are improved.

The invention discloses an energy storage converter predictive current control method based on data driving model self-learning, and belongs to the technical field of power electronic converter control. The energy storage converter is a half-bridge bidirectional DC-DC converter, and the method comprises the following steps: collecting the state quantity of the energy storage converter through a sensor in each control period, forming a data driving prediction model constructed by an input vector input neural network online parameter identification module, and outputting an initial duty ratio prediction value; constructing a value function, performing online optimization on an initial value through a gradient descent method to obtain a final optimal duty ratio, and simplifying a scene to directly use the initial value; comparing the optimal duty ratio with a carrier wave to generate a PWM (Pulse Width Modulation) signal to drive a power switch tube; actual inductive current is collected, an ideal duty ratio enabling the value function to be minimum is reversely solved to serve as a supervision signal, and the model weight is trained and updated online through a sample. The technical problem that traditional continuous set model predictive control depends on an accurate mathematical model is solved.

The invention discloses a method for improving Buck light load efficiency, which can prevent pseudo CCM operation and can keep high light load efficiency even under a large duty ratio, and comprises the following steps: after soft start of a Buck converter is completed, an enable signal at the end of soft start sets an RS trigger U3 to be in an active state, and if an inductive current zero-cross detection trigger signal rises, the RS trigger U3 is in a non-active state, the RS trigger U3 is in a non-active state, and if the inductive current zero-cross detection trigger signal is in a non-active state, the RS trigger U3 is in a non-active state. When the high-end switch and the synchronous low-end switch are switched on, the setting end input of the RS trigger U3 is triggered, a switch starting signal output by the RS trigger U3 is set at the beginning of each switching period, the switch starting signal controls the constant on-time generator to modulate the charging current or capacitance so as to prolong the time of simultaneously switching off the high-end switch and the synchronous low-end switch, and when the synchronous low-end switch is switched on, the synchronous low-end switch is switched off. And the reset end of the RS trigger U3 inputs an output signal of the constant on-time generator to trigger the RS trigger U3 to reset.

Embodiments of the disclosure provide a method that includes delivering a pulsed radio frequency (RF) signal from a source RF generator to an electrode of a processing chamber. A plasma is formed in a processing region of the processing chamber based on the pulsed RF signal. The plasma is disposed between the electrode and a substrate. The pulsed RF signal is caused to have a duty cycle in a range of 5 to 15 percent. The pulsed RF signal is caused to have an off-time in a range of 50 to 250 microseconds. A first material is deposited on a second material of the substrate and a third material of the substrate based on the duty cycle and the off-time.

The invention relates to the technical field of backlight control, in particular to an LED display-oriented adaptive PWM backlight control method and a backlight driving system, which are suitable for the backlight driving system comprising a boost converter, a brightness controller and an LED channel, and the method comprises the following steps: the brightness controller outputs a control voltage, a peak current control word and a duty ratio signal, and receives a state signal. Receiving brightness data, determining a nominal peak current and a duty ratio, and initializing the nominal peak current and the duty ratio; adjusting the control voltage to change the boost output, monitoring the state, locking the working point when all states are converted from the first state to the second state, and taking the final switching channel as a reference; a peak current word is increased for the non-reference channel under the working point, and when the state returns to the first state from the second state, an optimized peak current is taken back; and adjusting the duty ratio according to the ratio of the nominal peak current to the optimized peak current to enable the average current of each channel to be consistent. According to the invention, the problem that excessive voltage drop of a linear current regulator causes extra power consumption and heating and influences the brightness consistency between channels is solved.

The invention discloses a PFC (Power Factor Correction) circuit suitable for electrode high-voltage discharge. The PFC circuit comprises an EMI (Electro-Magnetic Interference) filtering module, a starting protection module, a PFC power conversion module and a PWM (Pulse-Width Modulation) switch type auxiliary power supply module which are connected in sequence. The EMI filtering module realizes bidirectional suppression of interference, and when the circuit is powered off, the bleeder resistor enables the common mode inductor and the differential mode capacitor to rapidly discharge, so that secondary interference is prevented; according to the PWM switch type auxiliary power supply module, a high-voltage area and a low-voltage area are isolated, and it is guaranteed that the power supply input pin of the control chip U2 / U3 can be within the normal working voltage; according to the invention, the control chip U2 limits the PWM duty ratio of the control chip U3 through the control logic, so that overcurrent protection is realized; when the MOS tube Q1 / Q2 is conducted, the resistor R22 consumes energy generated by discharging of the capacitor C21, meanwhile, resonance between the capacitor C21 and the energy storage inductor L2 is restrained, high-frequency electromagnetic interference is prevented, and electromagnetic compatibility of the whole system is achieved.

Systems, devices, and methods are provided for pulsed strain gauge topologies. A weight sensor assembly may comprise one or more load cells for receiving excitation pulses during a first state period of a duty cycle, sample and hold (S / H) circuitry connected to the one or more load cells that holds analog measurement signals from the one or more load cells, first filtering circuitry connected to the S / H circuitry for processing the analog measurement signals and producing a DC level signal, an amplification system connected to the filtering circuitry, for amplifying the DC level signal, second filtering circuitry connected to the amplification system for filtering power line noise, and analog-to-digital (ADC) circuitry connected to the second filtering circuitry. Examples of load cells described herein include full-bride load cells (FBLCs) and half-bridge load cells (HBLCs).

The invention discloses a laser current detection and dynamic control method and system, and the method comprises the steps: 1, controlling N groups of current detection modules to carry out the real-time sampling and processing of N actual working currents IN of N lasers after a control module sets a preset current I0, obtaining N digital sampling signals, and transmitting the N digital sampling signals to the control module; step 2, the control module compares the N digital sampling signals with the preset current one by one to obtain N difference values; and the control module dynamically adjusts the duty ratio and the frequency of the N paths of PWM signals according to the N difference values, and respectively controls the N multi-channel constant current driving chips to respectively output the preset current to the N lasers. According to the method and the system, real-time dynamic adjustment of the laser current is realized, and the stability of the laser power is improved.