14results about How to "Simple control structure" patented technology

This invention relates to the field of gearbox housing processing technology, and more particularly to a die-casting molding device for automotive gearbox housing processing. The device includes a base on which a die-casting mechanism is mounted for die-casting automotive gearbox housings. The die-casting mechanism includes: a mold assembly comprising a base mounted on the base, a fixed mold fixed to the front end of the base, a movable mold mounted on the base, a push plate slidably installed inside the fixed mold, and a push rod fixed to the front end of the push plate; and a linkage assembly comprising a guide seat fixed to the rear end of the push plate, guide grooves on both the left and right sides of the guide seat, a guide straight groove at the front end of the guide grooves, and sliding rods slidably mounted through both ends of the base. The device achieves sequential linkage between locking and demolding, with unlocking preceding ejection to avoid motion interference. The locking head angle and position are adjustable, offering strong adaptability and high assembly precision. Synchronous driving from both sides ensures stable locking alignment and smooth, reliable operation.

The invention relates to the technical field of power electronics, in particular to a control method and system for a self-adaptive fixed-time sliding mode control Buck converter, and the method comprises the following steps: building a Buck converter system model which adopts a double-closed-loop control structure to enhance the dynamic response and stability of the system; establishing a Buck converter state-space equation, and considering the influence of uncertain factors and external interference of the system; designing a sliding mode surface, and performing effective approximation on comprehensive uncertainty in the system by adopting a variable-index adaptive fixed-time sliding mode control method to form an improved control law; using an improved control law, taking the output of the voltage loop as the reference inductive current of the current loop, comparing the reference inductive current with the actual feedback current, and obtaining the error of the current loop; according to the error, accurate control of the Buck converter is realized by adjusting a control signal. According to the invention, the control structure is simplified, the convergence speed is improved, and the robustness and rapidity of the system are enhanced.

An open-type TBM includes a TBM main unit and supporting equipment. The TBM main unit includes a cutterhead, a front shield, a tensioning shield, and propulsion devices. The cutterhead is located at the front of the front shield. The front shield is connected to the tensioning shield via two sets of vertically symmetrically arranged propulsion devices and two sets of horizontally symmetrically arranged propulsion devices. The four sets of propulsion devices are connected in series along the circumference of the front shield. Each set of propulsion devices includes two propulsion cylinders, arranged in a V-shape with their front ends close to each other and their rear ends far apart. The tensioning shield has support shoes on its side for tensioning the rock wall. The supporting equipment includes a trailer and an advance drilling bridge. The front of the advance drilling bridge is connected to the rear of the trailer. The trailer is connected to the bottom of the tensioning shield via a towing cylinder. The trailer is equipped with a rear-support belt conveyor, an arch frame installer, and a bolt drilling rig, arranged sequentially from front to back. The advance drilling bridge is equipped with a shotcrete system and an advance drilling rig, arranged sequentially from front to back. This design can adapt to widening excavation conditions and small turning radius starting requirements.

The invention discloses a method for controlling a controlled impedance source of a modular multi-level matrix converter for low-frequency power transmission. According to the control method, on the basis of the idea of a controlled impedance source, the sub-module is equivalently designed to be a frequency division controlled impedance source, energy transfer between impedances is achieved, namely, a power frequency impedance source obtains energy from a power grid, a low frequency impedance source transmits power to a low frequency power transmission system, and therefore stable control over the capacitor voltage of the converter sub-module is guaranteed. And meanwhile, non-communication power frequency / low frequency grid-connected synchronization of the M3C system and self-synchronization among the sub-modules are realized by utilizing the passive synchronization characteristic of the controlled impedance source. The control structure is simple, the information flow of controller interaction and centralized communication can be obviously reduced, and expansion to more quantum modules is easy. According to the control method provided by the invention, the efficiency and safety of the flexible low-frequency power transmission system can be improved, and large-scale grid connection and frequency division power transmission of offshore wind power are realized.

This invention discloses a method for suppressing current imbalance and power oscillations based on a virtual synchronous generator (VSG). First, a traditional VSG loop model is established and its parameters are tuned. Then, the positive and negative sequence components of the grid-connected voltage, filter capacitor terminal voltage, and grid-connected current are extracted using a time-delay cancellation method and transformed to a synchronous rotating coordinate system. An equivalent VSG grid-connected loop model is added to the traditional VSG model. The traditional active power and extended reactive power calculation methods are transformed to the synchronous rotating coordinate system, and a reference value for the grid-connected current that suppresses the second harmonic component of the power is derived. A PI controller is used to make the actual grid-connected current track the reference value, and the output modulated wave drives the inverter. This invention can simultaneously suppress the second harmonic oscillations of active and reactive power, improve grid-connected current imbalance and distortion problems, while retaining the active power frequency regulation, reactive power voltage regulation, and inertial support characteristics of the VSG, thus improving the stability and power quality of the new energy grid-connected system.

The utility model provides a kind of charger for realizing high power belongs to charging technical field, including, single-phase full-bridge rectifier main circuit, for converting AC input into DC output, sampling conditioning circuit, the voltage division, filtering, isolation processing to the DC voltage after rectification and input AC voltage, output the sampling signal that meets adder and voltage controller level requirement, voltage controller, receives the voltage error signal generated by adder.According to the fixed conduction time of high-frequency switch tube in rectifier, the energy storage inductance is applied to the principle of volt-second balance, the turn-off time of high-frequency switch tube corresponding to different time is calculated, so that the current on the energy storage inductance always works in critical continuous mode, without adding extra current zero-crossing detection circuit, the circuit complexity is reduced, the reliability is improved, only a separate voltage controller is needed, to realize the high power factor of rectifier net side.

The application discloses a laser weeding robot, which comprises a movable main body and a control system, and is characterized in that a three-degree-of-freedom platform is arranged at the bottom of the movable main body, a laser emission mechanism is connected to the bottom of the three-degree-of-freedom platform, in addition, the first and second rope driving devices controlled by the control system are further included, the first and second rope driving devices are connected with the laser emission mechanism and the three-degree-of-freedom platform through ropes, wherein the second rope driving device is used for controlling the movement of the three-degree-of-freedom platform in the X, Y and Z axial directions, and the first rope driving device is used for adjusting the orientation of the laser emission mechanism. The three-degree-of-freedom platform and the laser emission mechanism of the application are controlled through the rope driving devices, the traditional multi-link structure is simplified, the whole control structure is simple, the production and maintenance costs are reduced, and the positioning speed and weeding efficiency are improved.

The application discloses a network-constructing energy storage coordinated control method for supporting grid voltage stability, and steps are as follows: real-time acquisition of state information and network-constructing energy storage output current; when the network-constructing energy storage output current does not reach an overcurrent limiting threshold, the network-constructing energy storage is controlled to adopt a constant voltage amplitude operation mode, the voltage amplitude of a node connected with the network-constructing energy storage is maintained to be equal to a reference value, so that a P-V characteristic curve of a load side is reshaped, the maximum transferable power of the load side is improved, and a static voltage stability margin is increased; when overcurrent occurs in the network-constructing energy storage, the network-constructing energy storage is switched to an overcurrent operation mode, in which mode, the network-constructing energy storage output active power and reactive power are distributed according to the ratio of line resistance to reactance between a grid node and a node connected with the network-constructing energy storage; and when the network-constructing energy storage output current falls below a preset recovery threshold, the constant voltage amplitude operation mode is restored. The application can improve the static voltage stability limit of a load node and the continuous voltage support capability of energy storage to the load under an overcurrent condition.

The application provides a tunnel simulation test full-section convergence deformation measuring device and measuring method, relates to the technical field of simulation test devices, and comprises an experimental tunnel body, convergence measuring instruments are arranged between the left and right sidewalls of the experimental tunnel body, a ruler frame is arranged at the left end of the convergence measuring instruments, two pressing plates are arranged on the ruler frame, the two pressing plates are gathered and separated at the same time, the rebound pulling of the extension spring sleeved on the limiting slide rod is used to ensure that the ruler belt is more compact in the winding state, loose deviation during winding and unwinding of the ruler belt is effectively avoided, the measuring efficiency of the device is improved, the problems that the steel ruler of the existing tunnel simulation test full-section convergence deformation measuring device has tension, is prone to loose deviation during winding and unwinding, affects the measuring efficiency, is not easy to position the ruler belt according to specific use conditions at any time, and the frequent measuring and pulling process is prone to loosen the fixed hooks of the wall body, and causes certain errors in the measuring result are solved.

The application discloses a battery management circuit and chip, the circuit comprises a battery access point, a switch component unit, a resistance network unit and a sampling capacitor; the switch component unit comprises a first switch component, a second switch component, a third switch component and a fourth switch component; the resistance network unit comprises a first voltage dividing circuit and a second voltage dividing circuit; the battery access point is connected with a battery, and the battery access point is further connected with the sampling capacitor through the switch component unit to form a bridge structure; the first switch component and the fourth switch component are connected through the first voltage dividing circuit, and the second switch component and the third switch component are connected through the second voltage dividing circuit; the switch component unit is configured to: based on whether the signal of the connection point of the gate of the fourth switch component and the first voltage dividing circuit exists or not, or whether the signal of the connection point of the gate of the third switch component and the second voltage dividing circuit exists or not, the opening and closing of each corresponding switch component are carried out; the beneficial effect is that the application can reduce the chip area.

The application discloses a grid-forming inverter virtual impedance control method, device and equipment, and the method comprises the following steps: acquiring an external voltage signal and an external current signal of an output inductance branch of a grid-forming inverter; based on the external voltage signal, the external current signal and power reference information of the grid-forming inverter, an instantaneous value reference signal of a target internal potential of the grid-forming inverter is obtained through a preset grid-forming control algorithm without virtual impedance; based on the instantaneous value reference signal of the target internal potential, the external voltage signal, the external current signal, preset virtual impedance parameters and preset real impedance parameter estimation values, a phase voltage instantaneous value reference signal of an equivalent controlled voltage source on an alternating current side of a power module of the grid-forming inverter is obtained through a virtual impedance construction algorithm; and a pulse width modulation signal is generated according to the phase voltage instantaneous value reference signal of the equivalent controlled voltage source, and the pulse width modulation signal is used to drive the power module of the grid-forming inverter, so that the virtual impedance control precision is improved.

The invention discloses a water level detection emergency broadcasting device which comprises a mounting frame fixedly mounted at the top of one side of a water level dam, a supporting frame is fixedly mounted at the top of the mounting frame, and a supporting disc is fixedly mounted at the top of the supporting frame. According to the invention, the emergency loudspeaker broadcast work can be automatically started, so that residents can take preventive measures in advance or evacuate emergently after being notified by the broadcast, and the situation of flood hidden dangers caused by rising of water level can be effectively prevented; the adjustment of the circumferential direction of the emergency loudspeaker broadcast body and the adjustment of the left-right elevation angle position of the emergency loudspeaker broadcast body can be carried out at the same time, so that the range of the emergency broadcast can be expanded, and the situation that some resident address positions cannot be notified by broadcast due to remote places can be effectively prevented; therefore, the emergency situation that the water level rises can be spread to each resident home more efficiently, the limitation that the emergency broadcast range is small in the past is greatly reduced, and popularization and use are facilitated.

The application discloses a novel multi-mode control transverse double-rotor unmanned helicopter, which comprises an unmanned aerial vehicle shell, a differential transmission module, a lift balance module, a pitching control module and a remote control system, wherein the differential transmission module comprises a brushless drive motor, a rotating shaft fixed wheel, a mechanical differential device, an electromagnetic speed control device and a rotor rotating shaft; the lift balance module is used for realizing the angle of attack change of the self-rotating rotor of the unmanned aerial vehicle; the pitching control module is used for realizing the rapid adjustment of the pitching attitude of the unmanned aerial vehicle; and the remote control system realizes the multi-mode control of the unmanned aerial vehicle through signal transmission. Through the cooperation of the lift balance module, the differential transmission module, the pitching control module and the remote control system, the unmanned aerial vehicle can effectively improve the turning maneuvering flexibility, the flight stability in the full speed range and the pitching attitude response speed, enhance the anti-interference ability and operation reliability in the complex low-altitude environment, and simultaneously simplify the control structure, reduce the overall power consumption and development and maintenance costs.

This application provides a distributed control device and method for hot-plugging multiple active bridge transformer submodules, comprising: a resistor divider circuit electrically connected to a high-frequency AC bus, used to convert the high-frequency AC bus voltage into a 0-5V divided voltage signal; a voltage comparator electrically connected to the output of the resistor divider circuit, comparing the divided voltage signal with a set reference potential and outputting high and low level digital signals; a DSP controller electrically connected to the voltage comparator, which sets a phase qualification flag when the phase difference between the local counter and the zero-phase reference t0 is less than a phase threshold; and a transformer submodule electrically connected to the DSP controller, which controls an AC relay to close to connect to the high-frequency AC bus when it receives the phase qualification flag from the DSP controller. This invention addresses the problems of related technologies that often employ centralized control, over-reliance on a central controller, and limitations in computing power and flexibility, especially as the number of modules increases.