395 results about "Duty cycling" patented technology

The application provides a phase-shift PWM modulation control method based on duty cycle scaling, which realizes real-time dynamic adjustment of output duty cycle by introducing a duty cycle scaling mechanism, can be used for active equalization control of branch currents in a multiple interleaved topology, makes the current and thermal stress distribution of each branch device more consistent, and thus significantly improves the overall operation stability and long-term reliability of the system. The application supports a large range of phase shift and is suitable for various high-power multiple interleaved topology structures. The application does not require an external synchronization signal and can generate double-bridge-arm driving signals only by relying on a single PWM input, which significantly reduces the system implementation complexity, simplifies the control interface and saves control resources.

The present invention provides an equipment control device capable of properly protecting a system that controls equipment via a coaxial cable. [Solution] The device control device 100 comprises a power supply circuit, a communication circuit, a filter, a high-side switch, and a control unit 110. The control unit 110 includes a power supply voltage detection unit 111 that detects the power supply voltage supplied from the power supply circuit, and a current data acquisition unit 112 that acquires current data of communication signals transmitted and received from the communication circuit. The control unit 110 also includes a duty cycle acquisition unit 113 that acquires the duty cycle of the current data, and a current value determination unit 114 that determines whether the current value of the current data is equal to or greater than a predetermined current threshold. Furthermore, the control unit 110 includes a duty cycle adjustment unit 115 that reduces the ON ratio of the duty cycle when it is determined that the current value is equal to or greater than the current threshold.

This application discloses a power supply circuit based on a three-phase power supply, and a method for simultaneously achieving power factor tracking and dynamic boost / buck conversion. The power supply circuit includes an information acquisition module and a power supply circuit unit, the power supply circuit unit includes three circuit groups formed by three phases connected to a three-phase power supply, and a control center for controlling the operating state of the three circuit groups. Each circuit group includes an input rectifier module, inductor, capacitor, switch and its controller, transformer, and output half-wave rectifier module. The output terminals of the three circuit groups included in the power supply circuit unit are connected in parallel or in series to solve the ripple problem and improve power conversion efficiency. The aforementioned power supply circuit adjusts the peak value of the input current at a high frequency, further adjusting the switching frequency and duty cycle, and controlling the charging and discharging time of the inductor to achieve power factor tracking, while simultaneously enabling dynamic adjustment of boost and buck voltage to meet load demands, effectively reduce costs, have low energy loss, and have high power conversion efficiency.

The application provides a resonant converter, which comprises a half-bridge unit and a resonant unit, an input end of the resonant unit is connected in parallel with an output end of the half-bridge unit, the resonant unit comprises a first capacitor, a first inductor and a transformer, the first capacitor, the first inductor and a primary winding of the transformer are connected in series, the transformer comprises a first secondary winding and a second secondary winding, and the resonant converter further comprises a first output rectification filter unit and a second output rectification filter unit, and the output ends of the first output rectification filter unit and the second output rectification filter unit are connected in parallel to output direct current. The application combines frequency control and duty cycle control, and widens the voltage regulation rate of the resonant converter.

The invention discloses a method for selectively separating valuable metals from a positive electrode material of a waste lithium battery, and belongs to the technical field of resource recycling of waste lithium ion batteries. The method comprises the following steps: preparing an aprotic deep eutectic solvent (DES) as a leaching agent and an electrolyte at the same time; the method comprises the following steps: adding a waste positive electrode material into DES, and leaching to obtain a DES leaching-electrolyte system; according to the method, the pulse voltage is applied in stages, selective separation of nickel, cobalt and manganese is achieved by controlling the pulse peak voltage (the first stage is-0.8 V to-1.0 V, the second stage is-1.0 V to-1.2 V, and the third stage is-1.2 V to-1.5 V), and the pulse frequency and the duty ratio are used for regulating and enhancing mass transfer and restraining side reactions. According to the method, the metal deposition potential difference is expanded through DES coordination regulation and control, efficient selective separation of nickel, cobalt and manganese is achieved in combination with pulse step-by-step voltage control, and the method has the advantages of being high in separation efficiency, few in side reaction, simplified in process, high in product purity and the like.

This invention discloses an adaptive charging method for nickel-metal hydride batteries based on pulse modulation. By simultaneously sampling the temperature at multiple characteristic locations on the battery surface and calculating the average temperature, thermal field standard deviation, and maximum battery temperature, a comprehensive quantitative perception of the overall and local thermal state of the battery is achieved, overcoming the limitations of single-point temperature measurement and accurately identifying local thermal risks. By comparing the thermal field standard deviation with a thermal field imbalance threshold and switching the charging control mode based on the comparison result, combined with a differentiated duty cycle adjustment strategy matched to the charging control mode, adaptive control of charging parameters is achieved, balancing charging efficiency when the thermal field is uniform and suppressing local hot spots when the thermal field is unbalanced. By simultaneously monitoring the real-time battery voltage, maximum battery temperature, and cumulative charging time, and immediately stopping pulse charging when a set threshold is reached, a triple safety protection mechanism is constructed, mitigating overcharging and overheating risks from multiple dimensions and significantly improving the safety and reliability of the charging process.

This invention relates to a low-current harmonic direct torque control method for a dual three-phase permanent magnet synchronous motor (PMSM), belonging to the field of PMSM control technology. The method is as follows: S1: Establish mathematical models of the fundamental and harmonic subspaces of the dual three-phase PMSM under vector space decoupling, and clarify the voltage vector distribution characteristics of the two subspaces; S2: In the fundamental subspace, design a duty cycle modulation strategy based on the principle of minimizing the error vector, and an improved deadbeat flux linkage torque controller; S3: In the harmonic subspace, design an online learning harmonic canceller, using the least mean square algorithm to update the weight coefficients in real time; S4: Select the D1 vector set as the effective vector of the harmonic subspace and perform sector division; S5: Add the effective voltage vector action time of the fundamental and harmonic subspaces to generate the final switching sequence, which is output to the dual three-phase inverter to effectively suppress torque ripple and harmonic current of the dual three-phase PMSM.

This invention discloses a method and device for bus capacitor energy storage active disturbance rejection voltage regulation control of a multiphase permanent magnet generator. The method establishes a bus capacitor energy balance equation based on the square of the DC bus voltage, and then restructures the equation into a linear active disturbance rejection standard form. A second-order linear extended state observer is designed to estimate the square of the DC bus voltage and the total disturbance in real time. A state feedback control law is designed based on the disturbance compensation principle to generate a virtual control quantity and obtain the linear active disturbance rejection current. The load current is low-pass filtered, and the feedforward current is calculated based on the power balance relationship and superimposed on the linear active disturbance rejection current to obtain the q-axis current reference. This reference current is then limited and subjected to anti-integral saturation processing before output. The difference between the reference current and the q-axis current is subjected to closed-loop control, and the resulting q-axis voltage is used as the generator voltage setpoint. All setpoint voltages are converted into the duty cycle of each phase for output. This invention achieves rapid and stable control of the bus voltage, with strong disturbance rejection capability and rapid dynamic response.

This invention relates to the field of electric drive control technology and discloses an automatic control method for an electric wheeled mountain vehicle under all working conditions. The method includes calculating and fusing the reference vehicle speed and transient slip ratio in pure wheeled mode; upon receiving reversing or uphill commands, constructing a state phase plane, controlling the deployment of auxiliary tracks, adjusting the target duty cycle, and calculating the target cavity pressure to generate normal support force when the slip ratio exceeds the limit, based on the Jacobian mapping relationship; controlling the shock-absorbing wheel system bracket to extend downwards and retract the auxiliary tracks to restore wheeled drive based on the slope crest pitch angle evaluation value; deploying the auxiliary tracks when the downhill trigger condition is met and combining regenerative braking with braking commands to form a composite braking state; calculating the stability margin and outputting an anti-rollover interruption command, or retracting the auxiliary tracks to execute differential drive actions when a steering signal is received. This invention improves the vehicle's traction stability, anti-rollover capability, and steering smoothness through terrain pre-control and electromechanical-hydraulic coordinated energy cascade redistribution.

A method is provided for reducing common mode voltages in a system that includes an inverter connected to a motor by a long cable by controlling switches of the inverter to generate voltage vectors that emulate a three-phase sinusoidal waveform by switching between adjacent active vectors and active vectors that are separated by 180 degrees, determining whether a phase angle of the vectors is increasing or decreasing, determining a decision angle within the sector which is a function of a duty cycle offset and a modulation index; and applying duty cycle manipulation rules, including: responding to an increasing phase angle that is less than the decision angle by setting a duty cycle of the adjacent active vectors to a duty cycle high value; and responding to an increasing phase angle that is greater than 60 degrees minus the decision angle by setting the duty cycle to a low value.

This application provides a multi-output flyback converter and power supply system, relating to the field of power supply technology. The multi-output flyback converter includes a control module, a transformer, a primary-side switching module, and multiple synchronous rectifier modules. The primary-side switching module is connected to the primary winding of the transformer, and each synchronous rectifier module is connected to each secondary winding of the transformer. Each synchronous rectifier module includes two back-to-back connected switching transistors. The control module is connected to the control terminals of the primary-side switching module, the control terminals of the two switching transistors in each synchronous rectifier module, and the output terminal of each synchronous rectifier module. The control module is used to adjust the duty cycle of the primary-side switching module according to the actual output voltage of the actively regulated output path; and to adjust the duty cycle of the switching transistors in each non-actively regulated output path according to the actual output voltage of each non-actively regulated output path, thereby eliminating cross-regulation between the outputs.

The application discloses a high-duty-cycle control system of a step-down DC-DC switching power supply, which is additionally provided with a high-duty-cycle control system on the basis of a basic structure of the switching power supply and comprises an LDO, a diode D2 for charging a capacitor C1 by the LDO, an error amplifier, a current comparator, an OR gate, a pulse generator, an RS latch and an under-voltage lockout circuit for detecting a voltage VBS between the capacitor C1. The under-voltage lockout circuit detects the voltage VBS between the capacitor C1, when the voltage is insufficient, temporarily turns off a charging switch tube M1, charges the capacitor C1 for providing a stable voltage power supply for a driving circuit during the turn-off of the M1, restores the power supply voltage of the driving circuit, and then reopens the M1, so as to realize the high-duty-cycle conduction of the NMOS type charging switch tube.

The present application provides a motor control device capable of accurately detecting a rotor position by sensorless control without being affected by component deviation. The motor control device of the present application includes a rotor position detection section (12) that detects a rotor position based on an induced voltage value calculated from an inverter output voltage value calculated based on a duty cycle on time calculated from a PWM signal generation section, a zero point estimation section (32) that estimates a zero point by calculating a duty cycle on time at which a phase current value is 0 based on a relationship between the phase current value and the duty cycle on time, a correction value operation section (33) that calculates a correction value for correcting the inverter output voltage value based on the estimated zero point, and a rotor position operation section that calculates a rotor position based on an induced voltage value calculated from the inverter output voltage value corrected based on the correction value.

The application relates to the technical field of vehicle control, and provides a permanent magnet synchronous motor output torque calculation method, device and computer program product. The method comprises the following steps: acquiring three-phase phase current signals, a high-voltage bus voltage signal and three-phase bridge arm drive duty cycle signals; based on the high-voltage bus voltage signal and the drive duty cycle signal, three-phase phase voltage signals are calculated; based on a pre-calibrated delay time mapping table, a delay parameter is determined; the three-phase phase current signals and the three-phase phase voltage signals are subjected to delay processing by using the delay parameter; based on the synchronized phase current signals and the phase voltage signals, the instantaneous electric power of the motor is calculated; based on a pre-calibrated efficiency mapping table, a corresponding motor efficiency value is determined; based on the instantaneous electric power, the motor efficiency value and the motor rotating speed, the output torque of the motor is calculated. The application compensates for calculation errors caused by signal transmission path differences and motor nonlinear characteristics, and improves the calculation accuracy of the output torque.

The application provides a method and system for dispersing carrier phase shift, which comprises at least two power modules connected in series and / or in parallel to form a modular system; each power module comprises a control module, the control module samples a common state variable at least twice, the slope of the common state variable at the first sampling time is opposite in sign to the slope of the common state variable at the second sampling time, and the time reference of the first sampling time of each control module is the same; and the carrier frequency of the power module is adjusted according to the relative size of the sampling value at the first sampling time and the sampling value at the second sampling time. According to the embodiment of the application, the carrier phase shift of the modular system connected in series or in parallel can be realized without the modules communicating with each other; meanwhile, the carrier phase shift can be automatically optimized under various duty cycle conditions through closed-loop control, and the system has good stability.

An optical device comprises an optical fiber for generating an illumination image by means of light emitted from its emission surface, a first light source unit arranged at a first end of the optical fiber, a second light source unit arranged at a second end of the optical fiber, and a controller for controlling the current applied to the first and second light sources in order to switch the first and second light sources on and off. The controller applies a first current signal with a first duty cycle that changes over time to the first light source unit and applies a second current signal, which depends on the first current signal and has a second duty cycle that also changes over time, to the second light source unit.

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 application discloses a duty cycle tunable frequency multiplier, a phase-locked loop circuit and electronic equipment, wherein the frequency multiplier comprises an input port, a first adjusting unit, a second adjusting unit, a third adjusting unit, a first control unit, a second control unit, a third control unit and a frequency multiplication unit. The frequency multiplier performs delay processing on a reference frequency through the adjusting units, selects a target delay signal through the control units, and then multiplies the reference frequency signal to generate a frequency multiplication signal, so that the duty cycle of the output clock signal is flexibly adjusted while the frequency multiplication is realized.

This invention relates to the field of new energy power generation control technology, and discloses a state space construction and maximum power point tracking system based on multi-feature information. The system includes: a state vector construction module for constructing the state vector of the current control cycle; a state space mapping module for determining the current unique operating state unit; a candidate interval generation module for generating candidate voltage intervals for the maximum power point; an interval verification and retention module for determining the retained voltage interval for the next control cycle; a target adjustment control module for determining the target voltage and the duty cycle of the next control cycle; a hysteresis boundary determination module for outputting a state hold command or a relocation trigger command; and a lock-and-relocate module for determining the maximum power point lock voltage or triggering relocation. This invention achieves stable tracking and relocation control of the maximum power point under complex operating conditions.

The application discloses a control method and device of a PFC circuit, a power supply, a storage medium and a computer program product, wherein a series resonance module is arranged between an inductor module and a full-bridge module of the PFC circuit; the method comprises the following steps: in the case that the PFC circuit works, the on-off of the series resonance module is controlled according to the inductor current of the inductor module; the control current reference value of the PFC circuit is determined by performing PI control on the output DC voltage of the PFC circuit in a voltage loop; and the duty cycle of all switch tubes in the full-bridge module is determined by performing deadbeat control on at least one of the inductor current of the inductor module, the input AC voltage of the PFC circuit, the control current reference value and the output DC voltage in a current loop. According to the scheme, the series resonance module is arranged in the PFC circuit, PI control is adopted in the voltage loop, and deadbeat control is adopted in the current loop, so that the dynamic response speed is accelerated, the switching loss is reduced, and the overall efficiency of the PFC circuit is improved.

This invention relates to the field of motor control technology, specifically to a control method and apparatus for preventing backflow of pump-generated voltage based on a synchronous BUCK circuit. The method includes: executing switching control of the synchronous BUCK circuit according to a set frequency and duty cycle of the switching transistors, and recording the values ​​of Vo and Vin once per switching control cycle; upon reaching a predetermined judgment period, reading the Vo and Vin values ​​recorded in each switching control cycle within the judgment period; determining whether a pump-generated voltage has occurred based on the changes in the Vo and Vin values ​​recorded in each switching control cycle within the judgment period; and if so, turning off both switching transistors Q1 and Q2. By acquiring the values ​​of Vin and Vo, the state of the synchronous BUCK circuit is determined using these two voltage values. When it is determined that a pump-generated voltage has occurred, both switching transistors Q1 and Q2 are turned off. That is, by controlling the switching state and duty cycle of Q1 and Q2, backflow of pump-generated voltage energy is prevented.

Apparatuses and methods for setting a duty cycler adjuster for improving clock duty cycle are disclosed. The duty cycle adjuster may be adjusted by different amounts, at least one smaller than another. Determining when to use the smaller adjustment may be based on duty cycle results. A duty cycle monitor may have an offset. A duty cycle code for the duty cycle adjuster may be set to an intermediate value of a duty cycle monitor offset. The duty cycle monitor offset may be determined by identifying duty cycle codes for an upper and for a lower boundary of the duty cycle monitor offset.

The application relates to the technical field of energy storage, in particular to a PCS heat dissipation system, a control method, a PCS and an energy storage system. The PCS is divided into a first region and a second region. The PCS heat dissipation system comprises a first temperature detection circuit and a first fan group located in the first region, a second temperature detection circuit, a control signal adjusting device and a second fan group located in the second region, and a controller receiving a first temperature signal output by the first temperature detection circuit, adjusting a duty cycle of a first control signal according to the first temperature signal, and outputting the first control signal to the first fan group. The controller outputs a second control signal with a fixed duty cycle to the control signal adjusting device. The control signal adjusting device adjusts a duty cycle of a third control signal according to a second temperature signal and outputs the third control signal to the second fan group. The scheme realizes the internal regional heat dissipation of the PCS and achieves the effect of the internal temperature regional control and adjustment of the PCS.

This invention discloses an automatic control method for the water pump and heating element of a garment steamer. The method controls the heating element relay to operate at a preset duty cycle until the temperature reaches a preset preheating temperature. Upon receiving a work command, the system controls the water pump to supply water at its initial setting and the heating element to heat at its initial power, then gradually increases the heating power to its maximum. The system continuously monitors the duration for which the temperature remains within the preset temperature range. If the duration does not reach the preset threshold, the heating power is reduced and the water pump supply setting is increased, and the monitoring is repeated. If the duration reaches the preset threshold multiple times consecutively, the current water pump supply setting is determined as the matching water volume setting and stored. Subsequent operations directly call upon the stored matching water volume setting to control the water pump supply. This invention effectively avoids splattering or dripping water by automatically adjusting the matching relationship between the water pump setting and the heating power, ensuring the stability of the steam temperature.

This invention discloses a model-predictive fixed-frequency motor drive modulation method. It relates to the fields of power electronics and electric drive control technology, and includes: obtaining the clamped duty cycle based on the current motor state; constructing an extended switch sequence set based on this, using a single variable to represent the pulse initial conduction time, deriving the relationship between the sub-interval action time and this variable, and the feasible region; calculating the current gradient of each sub-interval, recursively predicting the switching point current, and obtaining the state vector; constructing a cost function in the form of the squared L2 norm of the difference between the state vector and the reference vector, solving for the unconstrained optimal solution and projecting it onto the feasible region to obtain the optimal initial time of each sequence; merging the traditional SVPWM sequence and the extended switch sequence into a unified candidate set, constructing a unified cost function to calculate the minimum cost value of each sequence; selecting the sequence with the minimum cost value and its optimal solution to generate an augmented duty cycle vector, which is then converted into a gate signal to drive the inverter via dual-threshold pulse width modulation.

This application provides a method, electronic device, and vehicle for controlling a vehicle window. In response to receiving a synchronous control command for the window, the method determines an initial duty cycle, a reference window, and an adjustable window. Based on the initial duty cycle, it drives the corresponding drive motors for the reference window and the adjustable window, obtaining a first reference opening degree for the reference window and a first adjustable opening degree for the adjustable window. When the absolute value of the first opening degree difference between the first adjustable opening degree and the first reference opening degree is greater than or equal to a preset opening degree difference, it determines an updated duty cycle based on the first opening degree difference and the initial duty cycle. Based on the updated duty cycle, it drives the corresponding drive motor for the adjustable window. This adjusts the actual duty cycle for the adjustable window while maintaining the actual duty cycle for the reference window. Thus, the actual duty cycles of the drive motors for the reference window and the adjustable window are different, which effectively compensates for the asynchrony in window movement caused by other factors, improving the synchronization of window control.

This invention discloses a brushless motor current sampling method, specifically relating to the field of brushless motor technology. The method involves acquiring a current waveform sequence under no-load driving conditions and extracting small current feature segments before and after commutation. Based on each feature segment, a feature vector is constructed, including the pulse width modulation duty cycle change, driving phase voltage fluctuation, and relative phase. The feature vector is input into a small current error prediction model trained with historical errors, outputting a missampling offset. A linear interpolation method is used to superimpose the offset onto the original current sequence, generating a corrected current waveform. The corrected waveform is then input to a controller, where closed-loop regulation is achieved through a vector control algorithm. This invention effectively reduces the accumulation of sampling errors in the commutation section, improves current control accuracy, and is suitable for motor drive scenarios requiring high frequency and high dynamic response.

The application discloses a three-phase four-bridge-arm full-bridge inverter output voltage imbalance control method and device and a medium, and is suitable for the technical field of power electronics. According to the corresponding relationship among each output voltage reference value, an input direct current voltage value, each three-phase output voltage value and each three-phase output current value, the three-phase bridge-arm duty cycle of the next period is determined, so as to obtain the effective duty cycle and realize the control of the switching device of the three-phase bridge arm, thereby realizing the negative sequence imbalance degree suppression target. According to the corresponding relationship among each output voltage reference value, an input direct current voltage value, each three-phase output voltage value and each three-phase output current value, the zero sequence component is determined, the fourth phase bridge arm switching device duty cycle is calculated according to the differential feedforward algorithm, the control of the inverter neutral line current is realized, and the zero sequence imbalance degree of the inverter output voltage is suppressed.