66 results about "Time switching" patented technology

The invention discloses a switching system dynamic quantization control method and device based on event-triggered communication, and the method comprises the steps: building a continuous time switching linear system model for a switching system, and giving a system stability guarantee mechanism; designing a dynamic quantizer for the continuous time switching linear system model, giving a dynamic quantization parameter and a dynamic quantization updating strategy, and cooperatively designing an event triggering mechanism according to a state variable of the system and the dynamic quantization parameter; and designing a switching law according to an event triggering mechanism, and adjusting dynamic quantization parameters of the system to realize stable control of the system. On the premise of ensuring the system performance, the communication frequency and calculation burden of the system can be reduced, the resource utilization efficiency of the system can be improved, the method can be widely applied to the fields of network control systems, industrial automation systems and the like, and an effective solution is provided for solving the control problem of a complex system.

The invention discloses an enhanced transient stability improvement strategy and system for a grid-forming converter based on current amplitude limiting, and aims to effectively suppress a power angle instability phenomenon in a power grid fault or transient period and ensure that the converter has higher stability in a grid-connected process. The specific implementation comprises a dynamic dq-axis current amplitude limiting control strategy and a reference power control structure. Three-phase voltage and current of a grid-connected point of the converter are measured in real time, and a dq-axis current reference value and a power ring reference value are dynamically adjusted by combining a power angle and angular velocity deviation in an active power link, so that power angle instability during a transient period is accurately inhibited. According to the control strategy, the risks of overcurrent and system instability are effectively reduced, and particularly when a power grid breaks down or is in a normal condition, quick response and stable output of the system are ensured by switching the control modes in real time.

The invention relates to the technical field of wireless communication, and discloses an adaptive LDPC code coding method, system and device based on evaporation waveguide field intensity distribution, and a medium, and the method comprises the steps: obtaining the evaporation waveguide field intensity distribution in real time, and generating a field intensity distribution diagram; calculating a channel state parameter, and dynamically selecting a low-density parity check code rate according to the channel state parameter information; dynamic low-density parity check coding is adopted, and a sparse structure is adjusted through a check matrix, so that real-time switching of multi-code-rate low-density parity check codes is carried out; and a receiving end carries out decoding by adopting an NW-RBP decoding algorithm, defines a node updating rule, and dynamically schedules a node updating sequence through a residual error. According to the method, the bit error rate under a complex channel is reduced, and meanwhile, the reliable transmission efficiency of system data is improved.

This application provides a current limiting protection method and system for a variable speed constant frequency device. The method includes: First, the variable speed constant frequency device operates in a constant voltage state during normal operation; Second, it determines whether a hardware overcurrent protection event has occurred. If so, it proceeds to the third step; otherwise, it returns to the first step; Third, it performs a fault reset and automatically restarts the variable speed constant frequency device to operate in a constant current state. Furthermore, after operating in this constant current state, it determines whether the hardware overcurrent protection event is caused by a short circuit, overload, or other temporary sudden anomaly. If it is a short circuit, it maintains a preset current output for a certain duration, allowing the downstream circuit time to switch power and maintain circuit stability. If it is an overload, it performs overload protection and shuts down to prevent circuit damage. If it is neither a short circuit nor an overload, it is generally a temporary sudden anomaly, and it can switch back to operating in a constant voltage state.

The invention discloses an intelligent control method and system for real-time switching of a frequency converter, and relates to the field of real-time switching control of the frequency converter, and the method comprises the steps: analyzing the change slope of a frequency deviation time sequence through linear regression based on the phase angle and frequency value of the current output voltage of the frequency converter; meanwhile, the phase angle difference value variation between adjacent sampling points is calculated; the method comprises the following steps of: establishing a state machine of transfer logic, entering a phase angle monitoring state after the frequency is continuously converged, and generating a switching ready signal after judging that a frequency deviation trend and a phase angle difference trend both meet a stable approaching condition; after switching is completed, the switching stability is analyzed through the fluctuation amplitude of the output current and the change trend of the instantaneous rotating speed change rate, a closed-loop correction mechanism is started when the switching stability is detected to be abnormal, the optimal switching moment of the frequency converter is determined, and it is guaranteed that the motor runs stably before and after switching.

The invention provides an asymmetric modulation method and device for a bidirectional resonant DAB converter, and the method comprises the steps: determining the real-time duty ratio of any switching tube in a primary full bridge through the real-time working parameters of the bidirectional resonant DAB converter, and determining the real-time switching frequencies of a switching tube corresponding to the primary full bridge and a switching tube corresponding to a secondary full bridge, and enabling the real-time duty ratio of other switching tubes located on the same bridge arm with any switching tube to be complementary with the real-time duty ratio of any switching tube, thereby obtaining the real-time duty ratio of any switching tube according to the real-time duty ratio of the switching tube of the primary full bridge, the real-time duty ratio of the switching tube of the secondary full bridge and the real-time switching frequency. And controlling the switching states of a switching tube corresponding to the primary side full bridge and a switching tube corresponding to the secondary side full bridge, and asymmetrically modulating the bidirectional resonant DAB converter, thereby realizing the asymmetrical control of the positive high level duration and the negative high level duration of the midpoint voltage of the bridge arm of the primary side full bridge, and optimizing the reactive power.

The invention relates to the field of mechanical arm control, and discloses a sliding mode control method and system for a single-link mechanical arm under multi-node DoS attack, and the method comprises the steps: 1, constructing a dynamic model of the single-link mechanical arm, and constructing a T-S fuzzy switching model of the single-link mechanical arm as a controlled object; step 2, constructing a multi-node DoS attack model and acting on a communication channel between the sensor and the controller; step 3, introducing an RR communication protocol into a communication channel between the controller and the actuator; 4, constructing a fuzzy sliding mode controller; a closed-loop control system is integrated, and sliding mode control over the single-connecting-rod mechanical arm system is achieved. According to the method, T-S fuzzy modeling, the average residence time switching strategy, the sliding mode control law and the RR communication protocol are combined, the problems of high system nonlinearity, frequent working mode switching, limited communication resources, multi-node DoS attacks and the like in the posture control process of the mechanical arm are solved, and the safety, stability and control precision of the single-connecting-rod mechanical arm under complex working conditions are improved.

The invention provides a communication protocol adaptive switching method and device, a storage medium and a system, and the method comprises the steps: obtaining a voltage sampling signal of a communication line, and carrying out the preprocessing of the voltage sampling signal, and obtaining a voltage signal; extracting structural features of the voltage signal, wherein the structural features at least comprise a voltage start-stop character and a level form; matching the structural features of the voltage signal with a preset protocol template to obtain a communication protocol type of a communication line corresponding to the voltage signal, the preset protocol template being a mapping relation template of the communication protocol type and the structural features of the voltage signal; and controlling a protocol interface of the communication module according to the communication protocol type so as to realize switching of the communication protocol type. According to the invention, the problems that the communication delay is high and the requirement of multi-protocol real-time switching is difficult to meet due to the fact that switching needs to be carried out by relying on MCU (Micro Control Unit) software identification protocol formats when the Internet of Things module is adapted to different communication modes in the prior art are solved.

This invention discloses an intelligent control method for industrial park power load, relating to the field of energy utilization technology. Addressing the problem of inability to intelligently control industrial park power load, this solution includes a server, power line control equipment, power quality monitoring equipment, and power line load monitoring equipment. The server uses current and historical external power quality data to perform weighted prediction of power quality trends for subsequent time periods and controls external power lines. The power line control equipment receives real-time switching control commands for external power lines from the server. The power quality monitoring equipment collects and sends multi-dimensional quality data from both external and internal power lines to the server in real time. The power line load monitoring equipment sends internal power line load data to the server in real time. The advantage lies in intelligently controlling the industrial park's power load through pre-allocated lines, dynamic line control, load balancing, and pre-generated production plans, thereby reducing production risks.

The invention discloses a single-stage bidirectional DC-AC converter minimum current stress optimization method, system and device and a medium, and belongs to the technical field of power electronic converter control, and the method comprises the steps: building an operation mechanism comprising four effective working modes based on the single-stage bidirectional DC-AC converter through a frequency conversion phase shift control strategy and aiming at bidirectional energy transmission demands, the inverter and the rectifier respectively correspond to inversion and rectification modes under different relations of input and output voltages. Taking the minimum current stress as a target function, solving the optimal shift ratio by combining the transmission power constraint and the soft switching condition, and calculating the real-time switching frequency by adopting equal power modulation. Frequency conversion control is introduced on the basis of phase shift control, power factor correction and soft switching constraint can be achieved at the same time, the optimal phase shift ratio and the switching frequency are directly solved through an analytical expression, and the calculation complexity of a traditional iterative algorithm is avoided.

Provided in the present invention are a driving assembly, method and system for multi-period modulation, and a product. A control plane is decoupled from hardware by using, for example, SDN technology. A remote controller can implement the storage unit data configuration and circuit logic device programming of different devices on the basis of codes of controlled devices, provides various periodic / aperiodic timing driver signals required by various device chips, and is compatible with the timing requirements for the array driving and data reading of different device chips. The driving assembly for multi-period modulation comprises a state division assembly, a synchronous multi-period configuration assembly, and a single-period modulation assembly, wherein the state division assembly is used for performing functional decoding on the basis of a functional mode of a device and generating a timing-matched trigger signal on the basis of a specific functional mode; the synchronous multi-period configuration assembly is used for generating a plurality of types of periodic / aperiodic enable signals at different dominant frequencies on the basis of configuration information, so as to implement multi-period timing driving; and the single-period modulation assembly can be used as universal modulation units, and each unit can generate a periodic composite on-chip timing driver signal on the basis of the configuration information and a multi-period driver signal, so as to meet the driving requirements of digital and analog readout units of different device chips. The present invention as provided can greatly simplify the overall timing structure of a driver chip. By using a software-generated programmable interconnection connection sub-module array, the remote controller can output multi-period modulated driver signals in batches, and can meet the requirements of different devices for the multi-mode flexible configuration and real-time switching of periodic and aperiodic driver signals without the need for additional individual custom design. The design complexity is reduced. In addition, each module subunit can be configured with separate timing off-chip, thereby improving the fault tolerance rate and flexibility of chip timing design. Moreover, the reusability of multiple modules shortens the design period.

A shipborne VDES radio frequency transmit-receive terminal is characterized in that the shipborne VDES radio frequency transmit-receive terminal comprises a receiving channel which filters and amplifies a radio frequency signal received by a VDES satellite antenna and then sends the radio frequency signal to a baseband processing module for digital sampling and signal processing; a signal of the transmitting channel is generated by a data conversion circuit of the baseband processing module, and a radio frequency signal is transmitted to an antenna through filtering and amplification in the transmitting channel; and the transmit-receive switch is controlled by the baseband processing module to ensure real-time switching of the receiving channel and the transmitting channel.

The invention relates to an ultrasonic wave flight time measuring method and device, electronic equipment and a readable medium, and the method comprises the steps: applying a driving signal to a first transducer, enabling the first transducer to emit ultrasonic waves, and starting a timer to collect a transmitted waveform sequence; calculating the minimum flight time as a coarse value based on the distance between the transducers and the resultant velocity of the sound velocity and the wind speed; after the time is over, collecting a receiving waveform sequence of which the count value and the amplitude are within a preset range; transmitting and receiving waveforms are analyzed through waveform matching, a time offset value is obtained, and a coarse value is corrected to obtain first absolute flight time; switching a transmitting-receiving transducer, and similarly obtaining second absolute flight time; and matching the two received waveforms, calculating the offset time for correcting the difference between the two minimum flight times, and finally obtaining the high-precision relative flight time. The problem that the measurement precision and the operation efficiency cannot be considered when the ultrasonic flight time is measured is solved.

The invention provides a method, a system, equipment and a medium for switching among multiple access points of a power wireless local area network, and the method comprises the steps: receiving broadcast frames of all wireless access points in the power wireless local area network in real time when a mobile terminal communicates with the power wireless local area network; obtaining a state parameter of each wireless access point in the power wireless local area network; calculating an optimal wireless access point in the power wireless local area network in real time according to the state parameters; the mobile terminal is switched from the current wireless access point to the optimal wireless access point, and real-time switching of the optimal access point is realized, so that the signal quality of the mobile terminal is ensured, and the communication continuity, the data transmission stability and the operation safety of the inspection robot in a complex power operation environment are effectively ensured.

In a method of operation of an STA in a wireless LAN system, the STA receives a first PPDU of OBSS on a main channel and switches the operating channel from the main channel to an NPCA main channel based on an NPCA switching condition, wherein the NPCA switching condition includes a condition that the first PPDU is a PPDU of an inter-BSS and a condition that the NPCA operating period is greater than the minimum duration of the NPCA, and after switching to the NPCA main channel, operates on the NPCA main channel from the end of the NPCA operating period until a point in time preceding the channel switching back delay, and switches the operating channel during the channel switching back delay time to operate on the main channel at the end of the NPCA operating period.

The application discloses a channel estimation method for a smart medical STAR-RIS communication system, and belongs to the fields of wireless communication, STAR-RIS and channel estimation. In the STAR-RIS assisted single base station communication scenario of the smart medical STAR-RIS communication system, two different STAR-RIS transmission protocols (Energy Splitting, ES and Time Switching, TS) are considered, a least square algorithm is used to construct a minimum system channel estimation mean square error optimization problem of the two transmission protocols, and joint optimization design of a sending end training signal sequence and amplitude coefficients and phase coefficients of the STAR-RIS is given, so that downlink channel estimation is realized.

The invention discloses a wireless energy supply OAM communication system design and optimization method based on a time switching protocol, and relates to the technical field of communication, and the method comprises the steps: obtaining array configuration data of a base station and energy limited equipment, calculating channel parameters, and determining power distribution; generating a modulation matrix according to the OAM mode order, and dividing a time period into an energy transmission time period and an information transmission time period; energy acquisition data and link capacity are calculated, an optimal time switching factor is determined by adopting a convex optimization method by taking maximization of uplink total capacity as a target under the condition that the constraint of a service quality threshold value is met, and finally, a base station is controlled to complete cooperative transmission of energy and information; the method has the advantages that through deep fusion of OAM mode multiplexing and TS protocols, dynamic optimal balance of energy transmission and information transmission is achieved on the premise that the service quality is guaranteed, and the spectrum efficiency and the energy efficiency of a communication system are improved.

A user equipment may receive, from a serving radio network node, handover prediction configuration information indicative of at least one handover prediction criterion. A learning model executed by the user equipment may determine, based on the at least one handover prediction criterion, at least one handover event prediction and a confidence level corresponding to the learning model. The user equipment may adjust a time criterion of the at least one handover prediction criterion if the confidence level does not satisfy a confidence level criterion of the at least one handover prediction criterion. Based on the adjusted time handover prediction criterion, the learning model may determine an updated handover event prediction and an updated confidence level that satisfies the confidence level criterion and may report the updated prediction to the node. The node may adjust scheduling of delivery of traffic directed to the user equipment based on the updated prediction.

Embodiments of the present application provide a method and device for configuring a codebook feedback mode, a base station device and a storage medium. The method for configuring the codebook feedback mode comprises: periodically counting a scheduling traffic during a carrier aggregation service process to obtain a scheduling traffic counting result; determining a scheduling condition according to the scheduling traffic counting result; and configuring a target codebook feedback mode according to the scheduling condition. Embodiments of the present application periodically count the scheduling traffic during the carrier aggregation service process, dynamically modify the codebook feedback mode according to the scheduling condition, realize real-time switching of dynamic HARQ codebook and semi-static HARQ codebook feedback modes, and achieve the purpose of using the semi-static codebook to save scheduling time and reduce control processes when scheduling is intensive, and using the dynamic codebook to save resources when scheduling is sparse.

The invention provides a SiCMOSFET switching loss collaborative optimization method and system based on dynamic threshold regulation, and the method comprises the steps: extracting a first-order inflection point moment through analyzing a gate-source voltage transient slope evolution path, enabling the first-order inflection point moment to serve as a time anchor point to correlate with the voltage drop of a body diode so as to invert the junction temperature influence, and fusing a net gate charge attenuation trend to represent a process and an aging effect, thereby achieving the collaborative optimization of the switching loss of a SiCMOSFET. Generating a double-point asymmetric judgment point evolved along with the real-time state of the device; the carrier transport phase characteristics are combined to implement switch-on advance and switch-off delay, so that the driving action is accurately embedded into a real physical window for channel conductance establishment and depletion; therefore, turn-on triggering occurs at a critical forward moving point at which channel electrons begin to be effectively injected, turn-off triggering is maintained to the tail end of a channel carrier dominated depletion stage, the overlapping area is remarkably compressed, miller platform trailing and voltage overshoot are restrained, single-time switching energy loss is reduced fundamentally, and the performance of the device is improved. And the operation robustness of the system in a wide temperature range and a whole life cycle is improved.

The invention belongs to the technical field of emergency power supply management, and particularly discloses an uninterrupted emergency power supply system based on rapid switching, which comprises a signal acquisition and processing module, a switching judgment generation module, a phase prediction module and a switching execution module. And the signal acquisition and processing module extracts a phase angle and a voltage amplitude in real time. And the switching judgment module starts a differentiation rule to generate a switching instruction according to the condition triggered by the abnormal voltage. The phase prediction module calculates the switching-on leading time based on the standby power supply phase sequence. The switching execution module carries out continuous phase verification before closing and drives a composite switch unit composed of a mechanical switch and a power electronic switch which are connected in parallel, and stable uninterrupted power supply switching is realized in a cooperative mode of switching first and then switching off and electronic pilot. According to the invention, the problems of long switching time, phase out-of-step and existence of a detection blind area in a traditional switching scheme are solved, and the power supply reliability of the sensitive load is greatly improved.

The invention relates to the field of communication, in particular to a reinforcement learning-based control method for multi-link automatic switching of communication equipment. The core of the method is that a Q-learning algorithm is adopted to train an intelligent agent. According to the method, through continuous interaction between an intelligent agent and an environment, firstly, a multi-dimensional decision strategy capable of comprehensively balancing bandwidth, time delay, switching times and cost is learned, and a switching parameter Q table is generated; in turn, this Q table is queried directly in the communication device to perform real-time handover decisions. The Q table supports enhanced training generation and also supports continuous optimization in use, so that the system can dynamically adapt to network environment changes, and optimal balance of communication functions is always guaranteed.

The invention relates to the field of direct current motor control, and discloses an anti-denial of service attack direct current motor adaptive event triggering sliding mode control method, which comprises the following steps: step 1, constructing a direct current motor PDT switching system model as a controlled object; 2, defining a sliding mode function based on a PDT switching rule; 3, defining a sliding mode control law based on the sliding mode function, and constructing a sliding mode controller based on the sliding mode function and the sliding mode control law; 4, constructing an adaptive event triggering mechanism based on the DC motor PDT switching system model and the sliding mode controller; a direct current motor PDT switching system model, a sliding mode controller and a self-adaptive event triggering mechanism are integrated, a closed-loop system which resists denial of service attack and keeps stable operation is obtained, and self-adaptive event triggering sliding mode control of the direct current motor is achieved. According to the method, the continuous residence time switching rule, the sliding mode control rate and the adaptive event trigger control mechanism are combined, the control problem of switching the system under nonlinear interference and network attack in a traditional control method is solved, and the robustness and stability of the direct current motor under complex conditions are improved.

The utility model discloses an AC / DC power supply switching circuit for an elevator, which belongs to the technical field of elevator power control, and comprises an MCU microcontroller module, a CAN data communication module, an ADC sampling module and an IGBT driving module, the MCU microcontroller module is respectively connected with the CAN data communication module and the ADC sampling module, and the output end of the MCU module is connected with the IGBT driving module; according to the utility model, after ADC initialization and CAN communication initialization are carried out, a self-checking program is executed, and ADC acquisition and CAN communication are ensured to be normal. On the basis of ADC acquisition and data analysis, real-time monitoring of three-phase alternating current and real-time switching control of a main and standby power supply redundant system are realized. And normal operation of the elevator is ensured. The utility model has the characteristics of reliable structure, stable performance, high fault-tolerant mechanism, fast switching speed, intelligent control, wide application range and the like.

The invention relates to an OTA zone switching scheduling method based on MCU hardware double partitions. The method comprises the steps that S1, a memory of an MCU is divided into a firmware A zone and a firmware B zone in advance, and preset zone switching parameters are stored; s2, obtaining a region switching instruction and determining an original firmware region and a new firmware region; s3, writing real-time area cutting parameters of the new firmware area into a preset address according to the area cutting instruction; s4, in the preset address, verifying the real-time switching area parameter of the new firmware area and the stored preset switching area parameter of the firmware A area or the firmware B area: if the verification is passed, executing the step S5; if the verification fails, executing the step S8; s5, writing the real-time area switching parameters of the new firmware area into a fixed address, and performing area switching parameter protection; s6, executing a restart operation by calling an MCU soft reset function; s7, executing the program of the new firmware area when the area cutting process succeeds; and S8, executing the program of the original firmware area if the area switching process fails. According to the method, the reliability and the safety of area switching (parameters) in the automobile OTA upgrading process can be improved.

The application relates to the field of semiconductor devices, and discloses a Desat protection circuit with switchable protection time and a testing method of a device, wherein the Desat protection circuit with switchable protection time comprises a driving unit for turning on or turning off a power semiconductor device to be tested, a time switching unit for switching a preset protection time, and a state monitoring unit for monitoring a voltage across the power semiconductor device to be tested, so that when a short circuit test is performed on the power semiconductor device to be tested, that is, when the voltage across the power semiconductor device to be tested is greater than a preset threshold voltage, a signal for turning off the power semiconductor device to be tested is sent to the driving unit after the preset protection time. The application connects the time adjusting circuit corresponding to the adjusting switch to the state monitoring unit by closing the adjusting switch, so that the preset protection time is switched, different power semiconductor device testing requirements are met, and one driving board covers the testing of different manufacturers and different devices.

The invention relates to the field of phase-change switches, and provides a preparation process of a phase-change material layer in order to solve the problem that an existing phase-change material layer is initially in a high-resistance state and needs to be electrically initialized, and the preparation process comprises the following steps: S100, preparing a GeTe phase-change film through a photoetching process and a magnetron sputtering process; s200, preparing a phase change material layer from the phase change film through an annealing process; the initial vacuum degree of the annealing process is lt; the pressure is 5 * 10 <-2 > Pa, the annealing temperature is 280-350 DEG C, and the heating rate is 1t; the temperature is 20 DEG C / min, and the annealing time is gt; the time is 20 minutes. According to the invention, the first-time electric stress impact is eliminated, the destructive first-time switching operation is fundamentally avoided, the device enters a working state from the beginning under mild and uniform heat treatment, the generation of initial defects is greatly reduced, and the initial point of phase change fatigue is delayed, so that the recyclable operation life of the device is remarkably prolonged; according to the device provided by the invention, the first switching operation is omitted, the complexity of driving circuit design of the chip and the cost of chip test are reduced, and the design and test are simplified.

A user equipment may receive, from a serving radio network node, handover prediction configuration information indicative of at least one handover prediction criterion. A learning model executed by the user equipment may determine, based on the at least one handover prediction criterion, at least one handover event prediction and a confidence level corresponding to the learning model. The user equipment may adjust a time criterion of the at least one handover prediction criterion if the confidence level does not satisfy a confidence level criterion of the at least one handover prediction criterion. Based on the adjusted time handover prediction criterion, the learning model may determine an updated handover event prediction and an updated confidence level that satisfies the confidence level criterion and may report the updated prediction to the node. The node may adjust scheduling of delivery of traffic directed to the user equipment based on the updated prediction.

The invention discloses a DC arc anti-crosstalk fault detection method and device, a medium and equipment, and belongs to the technical field of arc fault detection. The method comprises the following steps: traversing and detecting multi-channel direct current arc signals in turn, and carrying out uniformly-spaced feature sampling to obtain a first key frequency point feature; and when the first key frequency point feature meets a turn detection time switching condition, the turn detection time is shortened, direct current arc signals of multiple channels are traversed and subjected to turn detection according to the shortened turn detection time, the comprehensive score of each channel is calculated, the channel with the highest comprehensive score is used as a suspected arc channel and is locked, and the channel with the highest comprehensive score is used as the suspected arc channel. And when the third key frequency point feature of the suspected arc channel meets the fault arc confirmation condition within the locking time, traversing the direct-current arc signals of the multiple channels according to the shortened round inspection time, calculating the comprehensive score of each channel, taking the channel with the highest two comprehensive scores as the fault arc channel, and determining the fault arc of the suspected arc channel. And obtaining an arc fault detection result. According to the invention, misjudgment can be reduced and detection accuracy can be improved.

This invention discloses a driver circuit with automatic dead-time switching based on a dual-N power transistor DC-DC architecture. It includes a driver circuit, a delay chain circuit, a switch failure prevention circuit, and a sampling logic circuit. The driver circuit transmits the input signal HSON to the output signal HSG. The delay chain circuit outputs a signal HS_DEAD_B with the same delay as signal HSG through delay control, which is then used by the sampling logic circuit for dead-time control. The sampling logic circuit determines which signal, SW or HS_DEAD_B, has a longer delay. The switch failure prevention circuit generates a signal SW_PRE whose delay is not limited by signal VH. This invention combines the delay chain and the sampled SW signal to automatically select either the delay chain or the sampled SW signal for dead-time control at different SW switching speeds, reducing dead-time across the entire load range while ensuring no crosstalk.