1301 results about "Switching signal" patented technology

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The invention discloses a low-orbit communication satellite load multilink cooperative transmission system, relates to the technical field of satellite communication, introduces a prediction-based active switching management mechanism, and effectively overcomes the inherent defects of a traditional passive switching mode in a high-speed moving scene. A continuous and stable optimal service satellite sequence can be prospectively planned for the user terminal, and resource negotiation and reservation with subsequent satellites are completed in advance; the blind switching and the ping-pong effect of the user terminal caused by instantaneous signal fluctuation at the coverage edge of a plurality of satellite signals are avoided from the source, unnecessary switching signaling interaction is greatly reduced, and the load of a network control plane is reduced.

A 5th generation (5G) or pre-5G communication system for supporting a higher data rate than previous 4th generation (4G) communication systems is provided. A switching circuit in a wireless communication system is provided. The switching circuit includes a first coil, a second coil electrically coupled to the first coil, a first switch electrically connected to the second coil, a third coil electrically coupled to the first coil, a second switch electrically connected to the third coil, and a control unit configured to control the opening or closing of the first switch and the second switch. The control unit can be configured to close the first switch and open the second switch to form a first path using the first coil and the second coil, and open the first switch and close the second switch to form a second path using the first coil and the third coil.

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 brake pedal verification method, device and equipment based on a two-way pedal and a storage medium, relates to the technical field of vehicle brake control, and discloses the brake pedal verification method based on the two-way pedal. Comprising the steps that a brake lamp switch signal, an allowable deviation threshold value and a first sensor signal and a second sensor signal of a two-way pedal position sensor are obtained; performing processing according to the first sensor signal and the second sensor signal to obtain a target deviation value, and performing consistency analysis according to the target deviation value and the allowable deviation threshold to obtain a consistency analysis result; performing fault tracing on the consistency analysis result according to the brake lamp switch signal to obtain a fault positioning result; and fault isolation is carried out based on the fault positioning result, so that brake pedal verification based on the two-way pedal is completed. The technical effect of guaranteeing the signal reliability of the two-way pedal position sensor and the function continuity of the braking system is achieved.

The invention discloses an event-triggered adaptive fixed time control method for a random nonlinear switching system. The method comprises the following steps: constructing a model of the random nonlinear switching system; introducing an event triggering mechanism; designing a fixed time control strategy; and designing an event-triggered fixed-time adaptive controller based on a backstepping method design framework. According to the event-triggered adaptive fixed time control method for the random nonlinear switching system, an event-triggered control strategy is adopted to reduce the communication burden of the system. A new controller is stably constructed by using fixed time, and the upper bound of convergence time is irrelevant to initial conditions; meanwhile, by introducing nonlinear mapping, a random nonlinear system with symmetric and asymmetric output constraints is converted into a new unconstrained system, and random switching of the control system is realized by using a switching signal.

An electronic device includes a display panel including a pixel. The pixel includes a first light emitting element, a second light emitting element, and a pixel circuit unit. The pixel circuit unit includes a first switching circuit electrically connected to the first light emitting element and applying a driving current to the first light emitting element in response to a first switching signal activated in a first mode, and a second switching circuit electrically connected to the second light emitting element and applying the driving current to the second light emitting element in response to a second switching signal activated in a second mode. The duration of active periods of the first switching signal and the second switching signal gradually increases or decreases during a predetermined period based on a mode switching time point.

The invention relates to an analog quantity selection method and system based on a Boolean switch, in particular to the field of industrial automation, and aims to directly realize signal mapping by adopting a pure hardware combinational logic circuit and thoroughly eliminate instruction execution time, so that the state change of a Boolean switch signal can be instantaneously reflected on analog quantity output; according to the method, real zero-delay switching is achieved, meanwhile, program adjusting algorithms in any form are avoided, disturbance phenomena such as overshoot or undershoot are completely eradicated from the principle, and high stability and accuracy of output signals are ensured. Finally, according to the technology, the control instruction can be accurately and synchronously issued without delay, and the response speed and the synchronization precision of the whole control system in a high dynamic response industrial scene are remarkably improved.

The invention discloses a control method for eliminating low-frequency circulating current of a zero common-mode voltage modulation strategy. The control method is used for eliminating the inherent low-frequency circulating current problem of the zero common-mode voltage modulation strategy. Existing zero common-mode voltage modulation strategies all adopt repeated vector sequences, low-frequency circulating current is inevitably introduced, and the practicability of the method is seriously affected. Therefore, the invention provides a control method for adjusting the switching time sequence, and the method realizes the balanced symmetry of the polarity of the circulating current in any two adjacent carrier wave periods by exchanging the switching signals of the parallel bridge arms or reversing the switching signals of the same bridge arm, thereby eliminating the problem of low-frequency circulating current introduced by an asymmetric sequence. According to the method, by adjusting related bridge arm switching signals, alternating conversion of circulating current polarity is achieved, and an original vector time sequence of an existing zero common mode voltage modulation strategy is not damaged. Therefore, the method achieves the optimal common-mode voltage of an existing algorithm, and further eliminates the inherent low-frequency circulating current.

The invention relates to an optimal power capturing method for a wave energy power generation device of a mixed-flow type air turbine, and belongs to the field of wave energy power generation. The optimal power capturing method comprises the steps that the change condition of the average output power of the turbine under different sea conditions along with the rotating speed is tested, and the maximum average output power point of the turbine under each sea condition is obtained; fitting the maximum average output power point under each sea condition to obtain a control law of the electromagnetic power of the motor; the quadrature-axis current reference value of the stator is made to be equal to zero, and the direct-axis current reference value of the stator is calculated; calculating a stator quadrature-direct axis current error term, and establishing a positive definite Lyapunov function; deriving the Lyapunov function, substituting the Lyapunov function into a stator quadrature-direct axis current state equation, and then performing transformation according to a first stability theorem to obtain a stator quadrature-direct axis voltage control law; and generating a corresponding SVPWM (Space Vector Pulse Width Modulation) switching signal according to a stator quadrature-axis voltage control law so as to control a motor-side converter and realize control on a turbine. The wave energy capturing efficiency can be improved.

The invention discloses an automatic high-precision assembly system and method based on visual feedback, belongs to the technical field of automatic assembly, and solves the problem that an existing scheme is insufficient in the aspects of automatic integration and actual usability. Comprising an embedded control unit, an XYZ Cartesian sliding table, a limiting sensor, a visual sensor, a visual mark and an upper computer processing unit, the embedded control unit is connected with the upper computer processing unit, and the embedded control unit is used for receiving a control instruction and feeding back state information. The embedded control unit is connected with a motor driver of the XYZ Cartesian sliding table and used for sending a motion control signal, and the embedded control unit is connected with the limiting sensor and used for receiving a switch signal. Working space boundary recognition and automatic calibration of the camera-robot hand-eye relation are achieved, the configuration and deployment process of a visual guidance system on the XYZ sliding table is greatly simplified, the requirement for professional skills of operators is lowered, and deployment efficiency is improved.

The invention relates to the technical field of automobile safety control, and discloses a brake detection method and system, a vehicle and a computer readable storage medium. The brake detection method comprises the steps that a brake switch signal and an air pressure switch signal are obtained; based on the brake switch signal and the air pressure switch signal, whether a brake request exists or not is judged; wherein if any one of the following conditions is met, it is judged that the brake request exists: the brake switch signal is in an effective state and a brake switch normally-closed fault is not triggered; the air pressure switch signal is in an effective state and does not trigger an air pressure switch normally-closed fault; the brake switch signal and the air pressure switch signal are both in an effective state. The brake intention recognition accuracy and the system reliability are effectively improved by obtaining the brake switch signal and the air pressure switch signal and judging whether the brake request exists or not based on the double-switch redundancy logic.

A switch device includes a circuit board, a coil structure, a lower cover, an upper cover, an elastic part, and a sliding part. The circuit board gas a through hole running through the circuit board. The coil structure is disposed on the circuit board and surrounds the through hole. The lower cover us located over the coil structure. The upper cover is disposed on the lower cover. The lower cover and the upper cover form an accommodating space. The elastic part is located in the accommodating space. The sliding part passes through an opening of the upper cover and is configured to slide relative to the lower cover along a direction. The sliding body is configured to drive the sliding part to pass through the through hole along the direction to generate a switch signal corresponding to an inductance variance of the coil structure.

The invention discloses a serial port switching control circuit, a serial port switching control method and a server, and relates to the technical field of servers, through cooperative work of a cache module, an output control module and a switching module, when a hot key switching signal is detected, a data output path is cut off immediately, a hot key code stream is prevented from being transmitted to an upper-layer system in an unvarnished manner, and the switching efficiency is improved. And system abnormal response and serial interface messy codes are effectively avoided. And after the switching is completed, recovering the data path, and transmitting the cached serial port data. According to the design, the problem of signal interference during serial port switching is solved from the hardware level, and the reliability and stability of multi-node debugging of the artificial intelligence server are remarkably improved.

A valve assembly for a pneumatic system of a vehicle, in particular a commercial vehicle, including: an outlet valve assembly for venting the pneumatic system, a control device for operating the valve assembly in order to admit and release air to and from a pneumatic actuator, wherein the control device is configured to output, to the outlet valve assembly, a switching signal for switching the outlet valve assembly, and, via the switching signal, the outlet valve assembly can be switched to a noise-reducing first venting mode or a quick-venting second venting mode.

The invention relates to the technical field of integrated circuits, in particular to a capacitive coupling type current steering digital-to-analog converter for transmitting switch control signals, which comprises a current steering unit and a switch signal control unit. The switching signal control unit comprises two capacitance coupling type level shifters; the current steering unit comprises a current source and transistors M1-M4, source electrodes of the transistors M1-M4 are connected with one end of the current source, and the other end of the current source is grounded; drain electrodes of the transistors M1-M2 are connected to form a positive output signal, and drain electrodes of the transistors M3-M4 are connected to form a negative output signal; the grid electrodes of the transistors M1-M2 are connected with a first capacitive coupling type level shifter, and the transistors M3-M4 are connected with a second capacitive coupling type level shifter; the on and off of the transistors M1-M4 are controlled through the two capacitance coupling type level shifters; the cross coupling unit is introduced to assist in transmitting switch control signals, and the dynamic performance of the digital-to-analog converter is improved.

The invention discloses an electric vehicle charging pile electromagnetic transient modeling method and system based on implicit trapezoidal integration, and the method specifically comprises the steps: building an equivalent electromagnetic transient model for describing the dynamic behavior of a charging pile converter, and dividing the state variable of the whole system into a plurality of subsystems; discretizing the state equation of the charging pile by adopting an implicit trapezoidal integral method, and converting a dynamic circuit into a static resistance network; processing the discretized state equation by using a central difference method to form a semi-implicit difference equation, and performing independent calculation on each subsystem; error correction of multiple switches is carried out based on a linear interpolation method, a zero point moment of a charging pile action switch function is searched, an equivalent duty ratio of a switch signal in a step length is calculated and substituted into the switch function, and accurate error compensation of charging pile switch action is achieved. According to the method, the electromagnetic transient modeling calculation complexity of the electric vehicle charging pile is reduced, the simulation precision is improved, the simulation time is shortened, and the simulation efficiency is improved.

The invention discloses a dynamic rendering method and system for a virtual scene based on a virtual game, and relates to the technical field of virtual scene methods, and the method comprises the steps: constructing a corresponding replacement picture according to the region position of each picture optimization region and an image region corresponding to a corresponding environment feature; and the primary virtual scene is dynamically rendered based on each replacement picture, the current picture of the virtual game and the role form corresponding to the user, so that the rendering accuracy of the primary virtual scene is improved. Therefore, a plurality of key scene elements of the next scene are determined according to the analysis of the scene switching signal of the virtual game, and a plurality of alternative virtual scenes corresponding to the next scene are determined according to the plurality of key scene elements and the final virtual scene; and the final switching scene is determined based on the plurality of alternative virtual scenes, the task items corresponding to the next scene and the scene hobby characteristics of the user, so that the accuracy of the final switching scene is improved.

A system to generate weld power for a welding process comprises: a power supply including a power inverter having multiple switches controlled by multiple switching signals such that each switch is alternately turned ON and OFF within each switching cycle of one of the multiple switching signals, to supply a current to an output circuit of the power supply that is configured to convert the current to the weld power, wherein the power inverter includes a capacitor and a capacitor switch connected in series with each other and across a switch of the multiple switches; and a controller to monitor a weld parameter and control the capacitor switch to either connect the capacitor across, or disconnect the capacitor from, the switch continuously across multiple cycles of a respective one of the multiple switching signals, depending on whether the weld parameter meets a predetermined operating condition of the welding process.

This disclosure provides a state switching method, apparatus, and electronic device. The state switching method includes: generating and maintaining a state switching signal when a preset state switching condition is met; switching the state of a target object using the state switching signal; calculating the time interval between the current time and the end time of a synchronization alignment signal; the synchronization alignment signal is a signal applied to the target object earlier than the state switching signal; and ending the state switching signal when the time interval meets a preset condition, thus completing the state switching of the target object; the preset condition includes the time interval being an even multiple of a first clock cycle. This embodiment ensures that the output signal of the target object after state switching is synchronized with the synchronization alignment signal, solving the problem of timing disorder and improving circuit performance.

The invention discloses an intelligent monitoring method and system for the microenvironment of a power distribution cabinet, and the method comprises the steps: collecting the multi-parameter data of the microenvironment of the power distribution cabinet in real time through a plurality of sensors disposed in the power distribution cabinet, and enabling the multi-parameter data to at least comprise temperature, humidity, voltage and current; transmitting the multi-parameter data to a processing platform through an internet of things network; on the processing platform, performing data fusion processing on the multi-parameter data to obtain comprehensive environment parameters; based on the comprehensive environmental parameters, performing environmental state evaluation by using a fuzzy logic algorithm, and outputting a security level; based on the time sequence data of the comprehensive environmental parameters, using a time sequence prediction model to carry out fault prediction, and outputting a parameter change trend; and performing anomaly detection based on at least one of the comprehensive environmental parameters, the security level and the parameter change trend, and sending out an alarm signal when an anomaly is detected. The invention aims to realize real-time accurate monitoring of the microenvironment of the power distribution cabinet, early warn various potential risks in time, avoid the situations of terminal strip corrosion, poor contact of a secondary line, short circuit, lightning breakdown, false alarm of a switching signal, false operation of a primary switch and the like caused by the microenvironment problem, improve the power supply reliability and guarantee the safety of a power grid.

The invention relates to the technical field of computer display, and discloses an intelligent display optimization method and system for a notebook computer, and the method comprises the steps: detecting an environment illumination change signal, an application scene switching signal, a battery electric quantity change signal and a user interaction signal, and triggering a display optimization process; executing a display optimization process, and performing coupling relationship analysis on the backlight PWM modulation frequency, the RGB three-primary-color gain value, the liquid crystal driving voltage amplitude and the display module power consumption value to obtain a display coupling influence matrix; constructing a display system dynamic association model; performing nonlinear power consumption constraint boundary calculation on the current battery charge state value to obtain a display parameter dynamic constraint range; and performing display quality and power consumption balance solution based on the display parameter dynamic constraint range to obtain a display control instruction set, so that real-time dynamic control on display hardware can be realized, and compared with an off-line optimization or periodic adjustment mode in the prior art, the method has better real-time performance and adaptability.

The invention discloses a permanent magnet synchronous motor nonlinear integral compound control method based on a novel reaching law. The method comprises the following steps: detecting a motor rotating speed omega and position angle information theta; calculating a rotating speed deviation e; transforming to obtain id and iq; calculating a nonlinear integral sliding mode surface s and a novel reaching law to observe a motor rotating speed omega and a load torque TL; calculating an output current given value iq *; performing Park inverse transformation to obtain u alpha and u beta; and performing voltage space vector pulse width modulation to obtain three switching signals of a three-phase inverter, and controlling the permanent magnet synchronous motor. According to the permanent magnet synchronous motor control method, the load disturbance observer and the nonlinear integral sliding mode controller are combined to construct the novel composite sliding mode controller, unknown disturbance can be estimated and compensated timely and accurately, the degree of dependence on high gain is effectively reduced, and the robustness of dealing with the unknown disturbance is remarkably improved.

The invention discloses a fault detection method for a driver of a motor operating mechanism of a vacuum circuit breaker, and relates to the field of internal characteristic inversion of the motor operating mechanism of the circuit breaker. The method specifically comprises the following steps: firstly, constructing an MLD model of a motor driving system based on PWM switching semaphore of an inverter in a permanent magnet synchronous motor driving circuit and current and rotating speed of a motor driven by the inverter; carrying out open-circuit fault simulation analysis on the motor driving circuit in the MLD model; further performing fault simulation analysis to obtain a phase current vector value of an actual fault state of the motor, constructing a theoretical estimation model of the current according to actual parameters of the motor, and calculating a residual value of the actual fault current value and the current estimated by the theoretical estimation model; and finally, according to the current residual values, faults of an upper tube and a lower tube in the motor driving circuit are detected respectively. According to the invention, additional hardware circuits or sensors are not needed, dependence on external feedback signals is avoided, the control structure is simple and efficient, and the dual advantages of low cost and high reliability are achieved.

A multi-master control circuit includes signal switch, D-type flip-flop, and multiplexer. The signal switch outputs switching signals based on a first control signal generated by a first processor or a second control signal generated by a second processor. The D-type flip-flop includes clock input, signal input, signal output, and inverted signal output. The clock input is coupled to the signal switch to receive the switching signals, and the inverted signal output is coupled to the signal input. Upon triggering by the switching signals, the signal output of the D-type flip-flop generates a selection signal. The multiplexer receives a first access signal generated by the first processor and a second access signal generated by the second processor. The multiplexer is coupled to the signal output of the D-type flip-flop to receive the selection signal and output either the first access signal or the second access signal based on the selection signal.

The invention discloses an active defense security control method for a hidden false data injection attack, and relates to the field of information physical system security control, in particular to an active defense security control method. The invention aims to solve the problem that the existing detection method can encrypt a transmitted signal, but is limited to detection of a specific type of attack, or dynamic coupling changing the configuration of a control system can increase the burden of a state estimator, and even causes the performance reduction of the system. The method comprises the following steps of: 1, acquiring output feedback gains of the information physical system under different switching signals; and 2, based on the output feedback control gain obtained in the step 1, performing active attack detection and positioning on the FDI attack, and when the attack is detected and positioned, performing active switching by a controller of the information physical system so as to construct an active security controller aiming at the FDI attack.

The invention provides a non-isolated LED power supply minuteness-removing turn-off circuit, which comprises a second power supply processing module, a minuteness-removing turn-off module and an LED lamp module, and is characterized in that the second power supply processing module is used for converting a high-voltage direct-current power supply into an LED lamp module working power supply; the micro-brightness removal turn-off module is arranged between the output end of the second power supply processing module and the LED lamp module and comprises a direct-current impedance conversion unit, an alternating-current impedance conversion unit and a switching tube, and the switching tube is arranged on a direct-current loop; and the control unit of the second power supply processing module reduces the DC voltage and the non-isolated AC induced voltage to be below the set voltage through the switching signal and the DC impedance conversion unit and the combined action of the switching signal and the AC impedance conversion unit, thereby realizing the minuteness-removing turn-off of the LED lamp module. According to the invention, contactless switch control can be realized, circuit loss is reduced, and working noise is reduced.

The embodiment of the utility model provides a range switching circuit and a formation and capacity grading system, and belongs to the technical field of electronic circuits. The range switching circuit comprises: a reactor circuit comprising a plurality of reactors; a sampling circuit coupled to the reactor circuit to detect a current flowing through the reactor circuit; the range switching module comprises a switch control circuit and at least one bypass switch module, the bypass switch module is connected with the at least one electric reactor in parallel, a switch control pin of the bypass switch module is connected with the switch control circuit, and the rate of a switch signal output by the switch control circuit is larger than the sampling rate of the sampling circuit; and the current compensation module is connected with the sampling loop of the sampling circuit and is used for performing current compensation under the condition that the current of the sampling loop changes suddenly. According to the embodiment of the invention, the current measurement precision of the battery in the formation and capacity grading process is improved.

The invention provides a reference voltage circuit and a DCDC converter, and relates to the technical field of semiconductors. The reference voltage circuit comprises a band-gap reference module and an operational amplifier module, the operational amplifier module is configured to enable the band-gap reference module to output initial reference voltage based on negative feedback operation, the operational amplifier module is configured with a first group of chopping switches, the band-gap reference module is configured with a second group of chopping switches, the first group of chopping switches has a first switching signal period, and the second group of chopping switches has a second switching signal period. The second group of chopping switches has a second switching signal period, and one of the first switching signal period and the second switching signal period is nested with the other one, so that error signals generated by the band-gap reference module and the operational amplifier module are reversely superposed; and the low-pass filtering module is configured to perform low-pass filtering on the initial reference voltage. According to the technical scheme, the reference voltage circuit meeting the requirement of a high-precision analog integrated circuit for the reference voltage can be obtained.

The present disclosure relates to a device for securing redundancy of an electric parking brake system, which includes a first MCU (micro control unit) having a driver circuit including a first driver circuit and a second driver circuit respectively connected to a first motor and a second motor for providing a driving force to an electric parking brake to control the first motor and the second motor, and a plurality of core processors to control the first driver circuit and the second driver circuit connected according to reception of an electric parking brake (EPB) switch signal, a second MCU having one core processor and connected to the second driver circuit, a first switch for connecting the first MCU and the second driver circuit, and a second switch for connecting the second MCU and the second driver circuit, and it may be applied to other exemplary embodiments.