36results about How to "Reduce switching times" patented technology

The invention relates to an automatic switching method of a terminal and a satellite based on multi-attribute decision, and belongs to the technical field of satellite communication. The objective of the invention is to solve the problems of frequent switching and network performance reduction caused by high-speed movement of satellites in a 5G NTN low-orbit satellite communication scene. The method comprises the following steps: firstly, a terminal collects information of satellites in a visible range, including longitude and latitude, signal strength, serial numbers, channel resources and the like, and reports the information to a service satellite; and the service satellite calculates the remaining coverage time of the current satellite on the terminal according to the reported information, and judges whether to trigger switching. And if switching is triggered, the service satellite screens a candidate satellite set, quantitative evaluation is carried out according to attributes such as a satellite elevation angle, residual service time, the number of channels and switching time delay, and the satellite with the maximum comprehensive quantitative value is selected as a target satellite. And finally, the service satellite initiates a switching request to the target satellite and starts a switching process to complete switching between the terminal and the satellite.

The invention relates to a vehicle-mounted network switching method and device in an Internet of Vehicles environment and electronic equipment, and the method comprises the steps: determining the receiving power of a target vehicle when the target vehicle is connected with each network base station in the future based on the future trajectory information and a channel knowledge graph of the target vehicle, and the channel knowledge graph comprises the channel information of each position; according to the future trajectory information of the target vehicle, determining the residence time of the target vehicle in the coverage range of each network base station in the future; and determining a target network switching strategy of the target vehicle based on the residence time of the target vehicle in the coverage range of each network base station in the future, the receiving power when each network base station is connected in the future, the network base station switching cost and the real-time load of each network base station. The problem that network switching achieved by an existing vehicle-mounted network switching method is prone to lagging behind communication environment changes is solved.

The invention discloses a communication signal interference optimization system and method based on machine learning, and the system comprises a channel data collection module which collects channel data in a communication environment, builds a channel data group, and transmits the channel data group to a data processing and feature extraction module; the data processing and feature extraction module is used for receiving the channel data set in real time and carrying out preprocessing and multi-feature engineering processing on the channel data set to obtain a channel feature set and a signal quality data set; the machine learning model module is used for constructing a multi-level model and training the constructed multi-level model; the self-adaptive channel selection optimization module is used for performing interference prediction analysis by using the training data transmitted by the machine learning model module and triggering a multi-channel switching mechanism; and the iterative optimization module is used for acquiring interference data in real time through the signal interference detection equipment group after the initial signal selection, evaluating and optimizing the current channel signal quality, and generating an iterative mechanism.

The invention discloses a partition pseudo-interrupt implementation method based on a shared storage domain, which comprises the following steps that: a core operating system initializes a pseudo-interrupt mechanism, and allocates a shared storage domain space for storing a pseudo-interrupt event; when an external interrupt is triggered, the core operating system stores a corresponding pseudo-interrupt event in a shared storage area corresponding to the partition, and sends a pseudo-interrupt signal to the corresponding partition; and registering a pseudo-interrupt service program in the partition, and when pseudo-interrupt of the partition is triggered and executed, sequentially taking out events from the shared storage area corresponding to the partition for processing until all events are processed. According to the method, the pseudo-interrupt event is stored in the shared storage domain of the system, so that the switching times of a user state and a system state can be reduced, the system overhead is saved, and the real-time performance of the embedded partition operating system is improved.

The embodiment of the invention provides a DU switching method and device, a source DU, a target DU and a CU, and relates to the technical field of satellite communication, and the method comprises the steps: obtaining a target instruction from the CU under the condition that a measurement report is received from UE; generating a UE context modification response in response to the UE context modification instruction; sending a UE context creation instruction to the target DU to enable the target DU to create a UE context, and generating and sending a UE context creation response to the source DU; in response to the UE context creation response, sending a UE context modification response and a UE context creation response to the CU, and sending an RRC reconfiguration message to the UE, so that the UE stops data transmission with the source DU, switches to the target DU, and generates and sends an RRC reconfiguration completion message to the source DU; and forwarding the RRC reconfiguration completion message to the target DU, so that the target DU sends the RRC reconfiguration completion message to the CU, and determining that the UE completes DU switching. By applying the scheme provided by the embodiment of the invention, the DU switching time can be shortened.

The invention discloses a die switching device, a crimping station die switching method and wiring harness processing equipment, the die switching device comprises a rack, a translation mechanism, a sliding mechanism and a supporting mechanism, the sliding mechanism is arranged on the upper surface of the rack, the translation mechanism is connected with the sliding mechanism, the sliding mechanism is matched with at least two sets of dies, and the supporting mechanism is arranged on the upper surface of the rack. The supporting mechanism is arranged on the rack corresponding to a crimping station of the die, the translation mechanism can drive the sliding mechanism to drive the adaptive die to horizontally move so as to switch the target die to the crimping station, and the supporting mechanism can support the die at the crimping station. The sliding gap possibly existing in the sliding mechanism is counteracted through the supporting effect, and it is ensured that the die is always kept at the accurate position in the crimping process.

The disclosure provides a communication control method, device, equipment, chip and medium, wherein the communication control method comprises: determining an initial uplink resource of a first cell, wherein the initial uplink resource is used for uplink transmission of the first cell; determining a first uplink resource according to the initial uplink resource; transmitting a first signal of a second cell according to the first uplink resource, wherein the first signal is used for determining downlink channel quality of the second cell, and the second cell multiplexes the initial uplink resource of the first cell; and maintaining the first uplink resource. The technical problem that in the prior art, in the carrier rotation scene, the number of cell switching is large, the source cell needs to wait for a long time before the uplink transmission can be recovered, and the communication performance is affected is solved.

The invention belongs to the technical field of motor control, and discloses a motor model prediction control method based on asymmetric hybrid vector pulse width modulation. Six sectors of a space voltage vector are divided into odd number sectors and even number sectors. In a singular sector, only a zero vector and a corresponding non-zero effective vector are adopted to perform two-section asymmetric synthesis, so that only one switching state change occurs in one period; in an even number sector, a non-zero effective vector in the sector, a non-zero effective vector in an adjacent odd number sector screened by a cost function and a zero vector are adopted to carry out three-section type asymmetric synthesis, and unnecessary switching actions are avoided while the current tracking performance is ensured. By means of the method, targeted control over the switching times is achieved in different sectors, and the average switching frequency is reduced. In the even-number sectors, optimization is carried out between the non-zero effective vectors of the adjacent odd-number sectors, the current prediction error is further optimized under the condition that the switching frequency is not obviously increased, and the current performance is ensured.

The present invention proposes a high-throughput satellite bandwidth adaptive allocation method, which can adaptively allocate bandwidth to users in different scenarios, while increasing user experience and reducing the number of potential frequency band switching times of users. It includes: dividing the system bandwidth into N sub-bands; setting an access threshold value according to the maximum number of access users in each sub-band, and judging whether the number of access users in the sub-band reaches the access threshold value, if it reaches it, it is defined as a bandwidth resource shortage scenario, otherwise it is defined as a bandwidth resource sufficient scenario; when it is a bandwidth resource shortage scenario, when a new user accesses, a sub-band with a small bandwidth is preferentially selected for access, at which time all sub-bands have reached the access user number threshold value; when it is a bandwidth resource sufficient scenario, when a new user accesses, a sub-band with a large bandwidth is preferentially selected for access, and at the same time, the master station counts the amount of service data of the accessed user in real time.

The application discloses a head tracking method in a conference room multi-camera system and related devices, and the method comprises the following steps: collecting video stream data in the conference room based on the multi-camera system, and performing head tracking processing on the video stream data based on a multi-target tracking algorithm to obtain head tracking data in the video stream data; performing glass reflection head filtering processing on the head tracking data in the video stream data based on a pre-trained glass reflection filtering model to obtain filtered head tracking data; performing glass inside and outside distinguishing processing on the filtered head tracking data based on a monocular depth estimation glass boundary distinguishing mode to obtain head tracking data in the glass, and displaying the head data in the glass in real time to a specified area of a conference display screen. In the embodiment of the application, the tracking accuracy can be improved in the scene of multiple people overlapping in the conference room, and the interference of glass reflection and data inside and outside the glass can be effectively removed.

The invention relates to a bale plucker (1; 40) for stripping a fiber bundle from a fiber package (3, 4) placed on a stationary substrate (2), comprising a frame (5) which can move on a substrate (2), a gripping unit (6) which is fixed on the frame (5) in a height-adjustable manner and is used for stripping a fiber bundle, a suction pipeline unit (7) which is connected to the gripping unit (6) and is fixed on the frame (5), and a channel device (8) which can be fixedly arranged relative to the substrate (2), a channel device (8) for receiving fiber bundles in the fiber material flow (F) and optionally transporting the fiber bundles to the first processing line or the second processing line, characterized in that a material flow divider (22) which is arranged in a stationary manner on the machine frame (5) is connected between the suction line unit (7) and the channel device (8), the material flow divider (22) being controllable, and the material flow divider (22) being arranged in a stationary manner on the machine frame (5). The channel device (8) can be connected to the first processing line in such a way that the fiber material flow (F) can be selectively guided through a first channel section (33) of the channel device (8) that can be connected to the first processing line or a second channel section (34) of the channel device (8) that can be connected to the second processing line.

The embodiment of the invention provides a signal processing method and circuit, a chip and electronic equipment, and the method comprises the steps: carrying out the PWM modulation of an input signal, and obtaining a PWM positive signal and a PWM negative signal; outputting a positive output signal and a negative output signal according to the PWM positive signal and the PWM negative signal; wherein in response to the fact that the absolute value of the amplitude of the input signal is larger than a threshold value, one of the positive output signal and the negative output signal does not comprise pulses, and the other one of the positive output signal and the negative output signal comprises two pulses in one pulse period. According to the scheme, the performance of the output signal can be improved while the performance is improved.

The application relates to the technical field of air conditioner intelligent control, and specifically discloses a multi-heat-exchanger intelligent defrosting control method and device based on multi-parameter fusion and heat load prediction and a storage medium, which comprises the following steps: collecting multi-dimensional operation data; performing feature calculation on the collected original data to obtain fin temperature change rate, evaporation pressure fluctuation rate and air enthalpy difference absolute value; constructing a fuzzy reasoning system to generate a frost formation confidence value; constructing a feedforward neural network model to generate an optimal defrosting cycle prediction value; generating a defrosting trigger instruction or a continuous monitoring instruction according to the confidence interval and the cycle achievement situation; detecting and pre-adjusting the pressure difference between the high-pressure side and the low-pressure side to execute switching between the running heat exchanger and the defrosting heat exchanger; collecting fin temperature data of the defrosted heat exchanger to generate a defrosting completion judgment result. Through improvement of the defrosting method, accurate frost formation state sensing, self-adaptive adjustment of the defrosting cycle, optimization of the judgment strategy and smooth control of the switching process are realized.

This invention discloses a deterministic path set planning method for low-Earth orbit (LEO) satellite networks based on the spatial domain. Based on predictable LEO satellite topology information, a shortest path algorithm is used to obtain a set of lateral paths that meet the deterministic service transmission delay requirements. The lateral path set within the j-th time slice is compared with the lateral path set within the (j+1)-th time slice. The path with the most overlapping inter-satellite links is selected as the path in the (j+1)-th time slice corresponding to a path in the j-th time slice, and so on, to obtain the set of longitudinal paths within the complete service time. The impact of different longitudinal path sets on transmission delay is measured to obtain an optimal deterministic path set. This invention determines the path search range by dividing the spatial domain and extended domain, maintaining path consistency, and reducing the number of path switching times within the service transmission time while ensuring that deterministic services meet the delay threshold, thereby reducing the overall transmission delay within the complete service time and improving the deterministic service capability.

The application discloses an improved deadbeat control method for reducing switching loss, and is implemented according to the following steps: step 1, modeling a single-phase circuit of an MMC, and meanwhile, establishing a single-phase upper and lower bridge arm node current equation; step 2, discretizing the established equation, and taking a ring current as a reference quantity to establish a deadbeat control system; step 3, collecting voltages of upper and lower bridge arms of each phase of the MMC and discriminating voltage discretization; step 4, operating the upper and lower bridge arm voltages output by step 2 to obtain the number of sub-modules that should be turned on for each phase of the upper and lower bridge arms of the MMC in the next control period; and step 5, sorting each sub-module voltage of each phase after being processed in step 3, and meanwhile, turning on or turning off specific sub-modules according to the number of sub-modules that should be turned on for each phase of the upper and lower bridge arms in the next control period obtained in step 4. The application can improve system dynamic performance, improve output voltage quality and reduce the number of times of turning on sub-modules of the system.

This utility model discloses a machining fixture for the main boom of an aerial work platform, comprising: a machine tool worktable and an end positioning and clamping device, a rotary clamping device, and a tail-side pushing and clamping device mounted on the machine tool worktable. The end positioning and clamping device, the rotary clamping device, and the tail-side pushing and clamping device are arranged sequentially at the front, middle, and rear of the machine tool worktable, and the three can automatically and collaboratively clamp the main boom of the aerial work platform. This application achieves automatic positioning and multi-point collaborative clamping of the main boom workpiece, eliminating positioning errors caused by manual operation. The hydraulic drive system ensures synchronous operation of each clamping device, shortening the clamping preparation time. The adaptive adjustment mechanism is compatible with workpieces of different specifications, reducing the number of tooling changes. The composite clamping method disperses contact stress, preventing clamping deformation of thin-walled structural parts. The multi-directional constraint mechanism effectively suppresses machining vibration and improves the positional accuracy of hole machining.

The application discloses a distributed adaptive framing output method based on large-range remote sensing images, and relates to the technical field of remote sensing image processing. The preprocessed large-range remote sensing images are stored in a COG format, the framing size and quantity are dynamically adjusted in combination with the target area range and resolution, the tasks are distributed by a data locality perception scheduler after Z-order curve sorting, the computing nodes load the framing data with a buffer area, the framing data is interpreted by a random forest, and the buffer area is cropped, finally, the virtual data set is aggregated, efficient distributed parallel processing of the large-range images is realized, the I / O bottleneck and the computing resource limitation are effectively relieved, the context missing problem on the framing boundary is solved, the intelligent interpretation efficiency and precision are improved, and the multi-resolution on-demand rendering and elastic expansion are supported to adapt to the data scale growth.

The invention relates to a parameter debugging method and device, electronic equipment and a computer program product, and belongs to the technical field of games. The method comprises the following steps: displaying a parameter setting interface in response to a setting instruction, wherein the parameter setting interface comprises parameter value setting controls of a plurality of parameters; responding to a batch setting instruction for at least one target parameter, and generating one or more debugging parameter values of the target parameter; displaying a game operation interface in response to the interface switching operation, the game operation interface including a batch debugging control, a game match scene and a virtual character, and the batch debugging control including a debugging parameter use control corresponding to a plurality of debugging parameter values of at least one target parameter; and determining one or more target debugging parameter use controls from the debugging parameter use controls, and performing game operation according to debugging parameter values corresponding to the target debugging parameter use controls. Through batch setting and debugging of the parameters, the interface switching frequency can be reduced, and the parameter debugging efficiency is improved.

The invention relates to the technical field of reactive compensation of a distribution network, and provides a load regulation and control management method and system, and the method comprises the steps: processing an input signal of each reactive adjustable branch of a load regulation and control management system; calculating the maximum allowable output reactive power of each reactive adjustable branch; calculating the maximum allowable reactive output capacity of the load regulation and control management system accessed to all loads; calculating active power and reactive power, and then calculating apparent power according to the active power and the reactive power; predicting the reactive power of a transformer and the reactive power of a power supply line in the load regulation and control management system according to the apparent power; calculating target total reactive power of sampling points in the load regulation and control management system; and calculating and issuing a reactive power target value of each reactive adjustable branch. The problems of reactive power return, network loss increase and voltage deviation out-of-limit existing in traditional reactive power compensation can be effectively solved, the switching frequency of the capacitor bank is reduced, and the service life of equipment is prolonged.

The present application relates to the technical fields of hydraulic system, more particularly, to a large-diameter digital throttle valve and a digital governing valve, comprising an adjustable throttle valve and at least one two-position two-way electromagnetic valve I, wherein the adjustable throttle valve and the two-position two-way electromagnetic valve I are arranged in parallel. The large-diameter digital throttle valve is connected in parallel with a plurality of two-position two-way valves and an adjustable throttle valve, so as to realize the complementary advantages of the two, on the one hand, different throttle areas can be realized by using different two-position two-way valve combinations, on the other hand, the parallel adjustable throttle valve can realize continuous change of the throttle area, avoiding high-frequency switching of the two-position two-way valve and reducing the flow and pressure impact caused by the digital valve.

The application relates to the technical field of patrol path optimization, and discloses an intelligent recommendation system for an external stand pipe inspection path, which comprises the following: an inspection unit records facade positions, center heights and inspection operation modes; an evaluation unit performs risk assessment on each inspection unit according to historical defect information, stand pipe types and environmental exposure conditions, obtains an inspection unit risk level, and forms an inspection unit time window constraint; a processing unit constructs an inspection service graph; a recommendation unit determines a to-be-inspected unit, generates a candidate inspection path on the inspection service graph, combines the candidate inspection paths into multiple inspection task packages, performs resource scheduling in combination with skill information and available time information of an inspection team, and obtains an inspection path recommendation result corresponding to each inspection team. The application reduces the overall inspection time and the number of high-cost inspection operation mode switching times, and improves the external stand pipe inspection safety and operation and maintenance management efficiency.

The utility model discloses a cover plate for a battery box body. The cover plate comprises a base plate and a sliding plate, the sliding plate is arranged on the base plate and is in sliding connection with the base plate; a plurality of first magnetic strips are embedded in the surface of the base plate in the PA-axis direction, a plurality of second magnetic strips are embedded in the surface of the sliding plate in the PA-axis direction, the first magnetic strips and the second magnetic strips are arranged at intervals in the PB-axis direction in a gradient decreasing trend, a first inserting groove is formed in one side of the base plate, and a second inserting groove is formed in the position, on the same side of the base plate, of the sliding plate. At least one magnetic sheet is inserted into each of the first slot and the second slot, the extraction direction of the magnetic sheets is perpendicular to the arrangement direction of the magnetic strips, and the magnetic sheet group and the magnetic strip array attract each other to form a three-dimensional orthogonal magnetic circuit; the cover plate is simple in structure, ingenious in design and high in practicability, the limitation that the size of a traditional cover plate is fixed is broken through through innovative fusion of a magnetic circuit and a sliding mechanism, and a flexible and efficient solution is provided for protection of a battery pack box body in a modularized and self-adaptive adjusting mode.

The utility model discloses a blanking device for a quartz sand acid leaching process. The blanking device comprises a polytetrafluoroethylene ball valve, the blanking control block is fixedly connected with the tetrafluoro ball valve, a through hole matched with a valve hole of the tetrafluoro ball valve is vertically formed in the blanking control block, and a groove orthogonal to the through hole is transversely formed in the blanking control block; and the inserting plate is slidably connected into the groove and used for controlling opening and closing of the through hole, the end, connected with the groove, of the inserting plate is an arc-shaped end, and the upper side face and the lower side face of the inserting plate are each provided with a fluororubber layer in interference fit with the discharging control block in a lining mode. The discharging control block and the inserting plate which are in sliding connection are arranged at the outlet end of the tetrafluoro ball valve, material discharging control can be achieved through the inserting plate, the opening and closing frequency of the tetrafluoro ball valve is effectively reduced, the service life of the tetrafluoro ball valve is prolonged, and the production cost is greatly reduced.

The utility model relates to the technical field of steel bar machining, and discloses a steel bar bending die and a steel bar bender. The steel bar bending die comprises a base, a locking assembly and a bending assembly, the base is provided with a locking groove, a first containing groove and a second containing groove, and the locking groove is used for allowing a locking shaft of a steel bar bending machine body to penetrate through; the locking assembly comprises a first locking piece, a first elastic piece, a second locking piece and a second elastic piece. The first locking piece and the second locking piece clamp the locking shaft extending into the locking groove under the elastic acting force of the first elastic piece and the second elastic piece correspondingly, locking of the steel bar bending die and the steel bar bending machine body is achieved, the locking shaft can rotate to eject the first locking piece and the second locking piece open, the locking shaft can be separated from the locking groove, and the steel bar bending die and the steel bar bending machine body are locked. The unlocking of the steel bar bending die and the steel bar bending machine body is realized, the automatic locking function of the steel bar bending die is realized, the automation of die switching is easy to realize, the labor cost is reduced, and the die switching time is shortened.

The application provides a high-performance video data distribution method, comprising the following steps: arranging multiple threads on multiple CPU cores of a transcoding server; according to video playing requests of multiple user clients, distributing the video playing requests of the multiple user clients to the multiple threads of the transcoding server, so that each thread distributes video transmitted by a camera to a corresponding client browser according to the video playing request of the user client allocated to the thread. The application arranges all threads on multiple CPU cores of a transcoding server, and the threads in the multiple CPU cores can distribute video data to multiple client browsers in parallel, so that the number of thread switching is reduced, while the data can be distributed by using multiple threads, and the network throughput is greatly improved.

This application provides a routing switching method, apparatus, computing device, and computer storage medium. The routing switching method includes: determining routing configuration information; determining at least two routes for a destination network address from a target routing table according to the routing configuration information, wherein the at least two routes include a primary route and at least one backup route; and sending the at least two routes corresponding to the destination network address to a forwarding end, wherein the forwarding end is used to enable at least one backup route to perform data forwarding operations in the event of a failure of the primary route among the at least two routes. The technical solution provided by this application reduces the interruption time of data forwarding tasks.

The utility model provides an attaching device and a reinforcing device, which comprise an attaching mechanism, an attaching platform and a feeding mechanism, and the feeding mechanism is used for supplying auxiliary materials; the attaching mechanism comprises an attaching driving assembly and a plurality of attaching assemblies, the attaching assemblies are used for sucking the auxiliary materials on the feeding mechanism, and the attaching driving assembly can selectively drive at least one attaching assembly to be switched between the attaching platform and the feeding mechanism; and the auxiliary material is sucked by the suction device so as to fit the sucked auxiliary material to an attached part on the attaching platform. According to the auxiliary material attaching device, when a plurality of auxiliary materials need to be attached to the attached part, the auxiliary materials on the feeding mechanism can be sucked through the attaching assemblies, the attached auxiliary materials sucked by the attaching assemblies are attached to the attached part on the attaching platform, the switching frequency of the single attaching assembly between the feeding mechanism and the attaching platform is reduced, and the attaching efficiency is improved. And the production efficiency is improved.

The present application relates to the technical field of stationary contact production, and discloses a stationary contact and a riveting forming machine thereof, the stationary contact comprising a main body, the middle part of the main body being bent to form a U-shaped structure, the middle part of the U-shaped structure being provided with a positioning arc surface, both ends of the stationary contact being provided with rivet point holes, and the end part of the stationary contact being provided with a chamfer; the riveting forming machine comprises a machine table, the machine table being provided with a material guide seat, the material guide seat being provided with a groove for feeding raw materials, one end of the groove being provided with a material pushing cylinder; the groove is provided with a riveting groove, the riveting groove is provided with a die groove, both sides of the riveting groove and located in the groove are provided with end grooves, the top of the material guide seat is fixedly provided with an inclined plate, and the inclined plate is provided with through holes corresponding to the end grooves. The riveting forming machine integrates stamping, bending, punching and chamfering processes, simplifies the switching of processes on different equipment, reduces the number of switching times of products in different processes, reduces manual clamping operation, improves production efficiency, and reduces processing errors of products.

The embodiment of the invention provides an amplifier device which comprises a voltage converter and a feedback controller, and the voltage converter comprises a switching network, a pumping capacitor module connected to a power supply end and a grounding end through the switching network, an H-bridge driving circuit and an output capacitor. The H-bridge driving circuit is provided with a voltage input end connected to the pumping capacitor module, and a first bridge arm and a second bridge arm which are connected between the voltage input end and a grounding end, and each of the first bridge arm and the second bridge arm comprises an upper power switch tube and a lower power switch tube; the output capacitor is connected between the connection point of the upper power switch tube and the lower power switch tube of the first bridge arm and the connection point of the upper power switch tube and the lower power switch tube of the second bridge arm and is used for providing output voltage; and the feedback controller is used for controlling on-off states of power switch tubes in the switch network and the H-bridge driving circuit according to the output voltage and a preset reference voltage, so that the output voltage is equal to a preset multiple of the preset reference voltage.

A DC / AC conversion device and a power supply system. The DC / AC conversion device comprises a transformer, a DC / AC conversion circuit located at the primary side of the transformer, a rectification circuit and a phase switching circuit located at the secondary side of the transformer, and a controller; wherein: the transformer is coupled with the DC / AC conversion circuit, and is adapted to step up a first alternating current signal output by the DC / AC conversion circuit to obtain a second alternating current signal; the rectification circuit is coupled with the transformer, and is adapted to rectify the second alternating current signal to obtain a second direct current signal; the phase switching circuit is coupled with the rectification circuit, and is composed of a plurality of switching tubes, and is adapted to phase switch the second direct current signal to obtain a third alternating current signal, the third alternating current signal being adapted to be input to an alternating current grid; and the controller. By using the above scheme, the loss of the switching tube in the DC / AC conversion device can be reduced.