70results about How to "Avoid startup failures" patented technology

The invention discloses a starting method of a full bridge and half bridge mixed type modular multilevel converter. The converter is subjected to alternating current uncontrolled charging firstly; when the voltage of each sub module of the converter reaches a working threshold value of a power-taking loop, an IGBT of a full-bridge sub module is triggered to enable the external characteristic of the full-bridge sub module to be consistent to that of a half-bridge sub module, and the system performs secondary uncontrolled charging to all sub modules through a starting resistor; after the secondary uncontrolled charging is completed, the voltage balance of the full-bridge sub module and the half-bridge sub module is realized through valve-control voltage-sharing control; and finally, direct current voltage control is started to complete starting of the converter. By adoption of the starting method, the condition of inconsistent charging voltages among different sub modules caused by inconsistency of charging characteristics among different sub modules can be solved, current impact caused by direct unlocking of the parallel serial type modular multilevel after uncontrolled charging can be lowered, and starting failure and protection lockout caused by uneven capacitive voltages of different sub modules can be avoided.

The invention provides an over-the-air upgrading control method and a device of a cloud television. A television terminal firstly receives a first attribute value of a to-be-downloaded upgrading packet sent by a server and returns response information for stopping pushing the upgrading packet to the server when determining that the difference value between user partition rest space and the occupied first attribute value for operating the to-be-downloaded upgrading packet is smaller than a set value. Thus, a problem of a failure to start the television terminal or applications, or abnormity of the server caused by insufficient user partition rest space after the upgrading packet has been downloaded is avoided, thereby ensuring reliable use of the television terminal or the applications, improving reliability of the television terminal and improving user experience.

The invention relates to a method and device for controlling a vehicle engine throttle valve plate. The method comprises the steps that the vehicle current environment temperature value and the engine water temperature value are acquired; when at least one of the current environment temperature value and the engine water temperature value is smaller than a set temperature value, a first control signal for setting the throttle valve plate to a zero opening degree position is sent to a throttle valve plate controller; whether the throttle valve plate reaches the zero opening degree position or not is detected; and when it is detected that the throttle valve plate does not reach the zero opening degree position, deicing operation is executed and comprises the steps of sending a second control signal for setting the throttle valve plate to a first opening degree position to the throttle valve plate controller and then sending the first control signal to the throttle valve plate controller. Through the adoption of the method and device, ice on the edge of the throttle valve plate can be effectively removed, and vehicle starting failures can be avoided.

The invention relates to the technical field of motors, in particular to a start control method and device of a permanent magnet synchronous motor. The method comprises the following steps: determining the initial position of a rotor of the permanent magnet synchronous motor; injecting high-frequency voltage component into the permanent magnet synchronous motor; extracting high-frequency response current from current output by the permanent magnet synchronous motor; extracting high-frequency current negative sequence component from the high-frequency response current; according to a heterodyne method, getting a rotor position error value from the high-frequency current negative sequence component; and according to the rotor position error value, controlling the rotating speed of the permanent magnet synchronous motor in a closed-loop manner to be adjusted to a target rotating speed. When the permanent magnet synchronous motor is started, the rotating speed of the permanent magnet synchronous motor in the closed-loop manner to be adjusted to the target rotating speed according to the rotor position error value, so that the permanent magnet synchronous motor can be controlled to gradually accelerate synchronous rotation according to feedback rotor position information, and the problem of start failure caused by the fact that the target rotating speed is applied to the permanent magnet synchronous motor directly is avoided from occurring.

The invention relates to a start control method and device of an air conditioner compressor. The control method comprises the steps that whether the compressor is in a stop state or not is judged according to the rotation speed of a rotor of the compressor; if the compressor is in the stop state, the air conditioner state is detected, and the last compressor start mode is obtained; the present compressor start mode is determined according to the air conditioner state and the last compressor start mode; the compressor is controlled to be started in the present compressor start mode; and after the compressor is started in the present compressor start mode, the compressor is controlled to operate at a preset speed. The start control method and device of the air conditioner compressor can determine the start ways of the compressor according to the actual state of an air conditioner system, and noise and energy consumption can be reduced while the effect that the compressor is easily started is ensured.

The present invention provides a method for starting a modularized multi-level flexible direct-current transmission converter. The method comprises: connecting a direct-current side pole of each converter station, disconnecting an alternating-current circuit breaker of each converter station, and locking a sub module of each converter station; closing an alternating-current circuit breaker of an active station at one end, and a power supply carrying out passive charging on the active station and the remaining converter stations by using startup resistors; after the passive charging is completed, bypassing the startup resistor of the active station, unlocking the remaining converter stations, and carrying out active charging to reach a rated voltage of a power module; interlocking the remaining converter stations, the converter stations charged by the active station carrying out unlocking and starting direct-current voltage control subjected to a slope until the power module is charged to the rated voltage; and unlocking the remaining converter stations, after entering into a controlled stage again, carrying out grid connection and switching a control policy to a normal operation policy, and increasing power, wherein the converter operates normally. According to the method disclosed by the present invention, voltage consistency of the power module in the starting process can be ensured, so as to avoid startup failure and protection locking caused by unevenness of the capacitance and voltage of the power module.

The invention discloses a magnetic levitation bearing control method and device, a storage medium, and a magnetic levitation system. The method comprises the following steps of determining whether thestarting torque required when a compressor in the magnetic levitation system is started exceeds preset torque or not; and if the starting torque required when the compressor is started exceeds the preset torque, increasing control parameters of the magnetic levitation system to control the control parameters of a magnetic levitation bearing to be adapted to the starting torque required when the compressor is started. According to the scheme disclosed by the invention, the problem that the starting torque is variable to affect the starting reliability can be solved so as to achieve the effectof improving the starting reliability.

The application discloses a smart TV and a system starting method thereof. The method comprises the following steps: freezing a user process and a kernel process for accessing a first partition in theinternal memory; triggering the process for unique system mirror loading, enabling the process to read a unique system mirror from a non-volatile memory , and loading the unique system mirror in theinternal memory; unfreezing a data synchronization process in the user process so that the data synchronization process synchronizes the data in a second partition corresponding to the first partition in the non-volatile memory to the first partition; after the data synchronization is accomplished, unfreezing other frozen system processes. The problem that the system starting is failed since thedata in the unique system mirror is unmatched with the data correspondingly stored in the non-volatile memory in the system starting based on the unique system mirror can be solved through the systemstarting method disclosed by the application.

The invention discloses an on-orbit write-in and self-checking method based on a page mode for a spacecraft EEPROM, and belongs to the technical field of spacecraft software safety. According to the method disclosed by the invention, the integrity and correctness of the received data to be written into the EEPROM program are checked, and the correctness of the EEPROM data after on-orbit writing ischecked, so that the data finally written into the EEPROM is completely consistent with the data expected to be written into the EEPROM; Meanwhile, the EEPROM is automatically detected periodically,correct data are written back in time in the area where single-bit errors or double-bit errors occur, the single-bit errors or double-bit errors in the EEPROM can be found out in time, and correct data stored in the SRAM temporary cache area are used for write-back correction in time.

Embodiments of the present invention provide a method and device for starting a permanent magnet synchronous motor, which relate to the field of motors and solve the problem of failure to start the permanent magnet motor in the prior art due to the angle difference between the preset position and the actual position of the motor rotor The problem. The method includes: by determining the angle difference θ between the preset angle and the actual angle of the motor rotor ₁ ; Secondly, the angle difference θ ₁ Divided into N equal sub-angle differences, where the angle value of each sub-angle difference is Δθ; then, according to the angle difference θ ₁ The load current determined by the initial current of the motor stator and the angle value Δθ of the sub-angle difference, gradually reduce the angle difference θ ₁ decrease; finally, when the angle difference θ ₁ When reduced to 0, the permanent magnet synchronous motor is started. The invention is applied to the starting of the permanent magnet synchronous motor.

The invention discloses a weak-power control circuit for a photovoltaic motor driver. The circuit comprises an MCU, a photovoltaic assembly, a Boost circuit, a three-phase inverse circuit, an input current sensor, a bus capacitor, an input voltage detection circuit, a bus voltage detection circuit, a motor, a bus energy storage circuit, an energy storage super-capacitor slow-starting and leakage circuit and an energy storage super-capacitor voltage detection circuit. The invention further discloses a control method of the weak-power control circuit for the photovoltaic motor driver at the sametime. According to the weak-power control circuit for the photovoltaic motor driver, normal work of the driver at extremely-low input power can be achieved, continuous MPPT control over the photovoltaic assembly at the low light condition is achieved, the running time of the driver is prolonged, and the assembly energy is sufficiently used; meanwhile, by means of the technical scheme, the motor starting power of the driver at low input power can be remarkably improved, the starting failure of the motor is avoided, and the control performance of the motor is improved.

The invention provides an air conditioner, a control method and a control device thereof and a computer readable storage medium. The air conditioner comprises a plurality of external fans, a first temperature measuring member configured to detect an ambient temperature, a processor electrically connected to the first temperature measuring member and the plurality of external fans and a memory forstoring processor-executable instructions. When the processor is used for executing the executable instructions stored in the memory, the processor is configured to execute the following steps that heating of the air conditioner is controlled to start up; and the air conditioner is controlled to start with a first program or a second program according to the ambient temperature, wherein the firstprogram comprises the step of controlling the operation of the plurality of external fans, and the second program comprises the step of controlling at least one of the plurality of external fans to beclosed. According to the air conditioner, the problem that the internal pipe temperature or pressure is too high due to heating startup when the ambient temperature is high can be well avoided, the problems of starting failure or frequent starting caused by too high internal pipe temperature or pressure are solved, and the startup efficiency of the air conditioner is well considered.

The invention provides a detection control device and method for an ejector, belongs to the technical field of fuel cell control, and solves the problem that potential faults of the ejector under a cold start working condition cannot be identified in the prior art. The device comprises an electric pile, a hydrogen source, a hydrogen ejector I, a hydrogen ejector II, an ejector to be tested, hydrogen recovery equipment and a controller. One output path of the hydrogen source is transmitted to a hydrogen inlet of the galvanic pile through a hydrogen ejector II, and the other output path of the hydrogen source is transmitted to the hydrogen inlet of the galvanic pile from a nozzle inlet of the ejector to be tested through a hydrogen ejector I; and hydrogen discharged by the electric pile is fed back to a drainage gas inlet of the ejector to be tested through the hydrogen recovery equipment. After the controller receives an ejector detection instruction, the hydrogen ejector I is started, the difference value of the pressure of hydrogen entering and exiting the reactor is obtained, whether the ejector to be tested works normally or not is judged, and if the ejector to be tested works abnormally, the hydrogen ejector II is started, the temperature of the ejector is increased, and judgment is conducted again till the ejector to be tested works normally. The cold start success rate of the fuel cell is improved.

The invention discloses a composite liquid absorption core for a loop heat pipe. The composite liquid absorption core for the loop heat pipe is composed of metal powder, small phase-change balls and holes, wherein the diameter of the metal powder is 25-150 micrometers; each small phase-change ball is composed of a small phase-change ball outer shell and phase-change materials in the outer shell, the diameter of the small phase-change balls is 1-3 mm, and the solid-liquid phase-change temperature of the phase-change materials is 3 DEG C lower than the boiling point of work medium in the loop heat pipe; the size of the holes is realized by controlling the proportion of the metal powder with different particle diameters and the small phase-change balls. The composite liquid absorption core for the loop heat pipe can effectively avoid starting failure of the loop heat pipe caused by heat leakage of an evaporator shell body and the backward heat conduction effect of the liquid absorption core in the initial starting period of the loop heat pipe, facilitates smooth starting of the loop heat pipe and improves the operation stability of the loop heat pipe.

The invention provides a PEMFC cold start system with a nitrogen-doped and hydrogen-doped purging device, and a control method thereof. The system comprises a controller FCU, a PEMFC electric pile, an air system, a nitrogen system, a hydrogen system, a gas purging device, a gas mixing device and a temperature and humidity acquisition device, an anode and a cathode on the PEMFC electric pile are respectively connected with the temperature and humidity acquisition device; and the controller FCU is connected with the temperature and humidity acquisition device, the anode on the PEMFC electric pile is connected with the hydrogen system, the nitrogen system is connected with the hydrogen system, the nitrogen system and the hydrogen system are connected with the air systems, the gas mixing device is arranged on a pipeline between the air systems, and the nitrogen system is connected with the gas heating device. According to the PEMFC cold start system with the nitrogen-doped and hydrogen-doped purging device, and the control method thereof, the heating efficiency is high, the structure arrangement is compact, the PEMFC cold start system is suitable for low-temperature cold start operation in various environments, and the technology is mainly used for fuel cell automobiles.

The invention discloses a heat dissipation system based on a pump drive capillary phase change loop. The heat dissipation system comprises a first liquid pipeline, a second liquid pipeline, a steam pipeline, an ejector and an evaporator. The first end of the second liquid pipeline is communicated with the first end of the first liquid pipeline through the ejector, and the second end of the secondliquid pipeline is communicated with the second end of the first liquid pipeline through the evaporator; the first end of the steam pipeline is communicated with the first end of the first liquid pipeline through an ejector; the second end of the steam pipeline is communicated with the second end of the first liquid pipeline through the evaporator; an active heat dissipation technology and a passive heat dissipation technology are combined; the heat exchange capability is improved by utilizing phase change latent heat of the working medium; the heat dissipation system meets the heat dissipation requirement of high heat flow density, has high heat transfer efficiency, improves the power of electric power and electronic devices, improves the working efficiency of the electric power and the electronic devices. The defects that a loop heat pipe and a capillary pump loop are small in transmission distance, difficult to start and the like are overcome, and the heat dissipation system adaptsto heat dissipation of the electronic devices with different heat flow densities.

The embodiment of the invention provides a starting method for a communication interconnection line-free multi-converter parallel system. The method comprises the steps of obtaining a direct current side voltage of an inverter in a pre-charge process; obtaining a pseudo random number according to the direct current side voltage; obtaining an expectation value of an inverter unit as a pilot inverter unit, and carrying out +1 processing on the expectation value and a preset value to obtain a processed expectation value; carrying out residual value calculation on the +1 processed expectation value through utilization of the pseudo random number, thereby obtaining residual value; judging whether the expectation value and the residual value are consistent or not, determining that the inverter unit is the pilot inverter unit if the expectation value and the residual value are consistent, controlling the inverter to be started, and controlling an output side contactor to be closed; and if theexpectation value and the residual value are inconsistent, when a bus voltage sensor detects a bus voltage, following the bus voltage, thereby controlling the inverter to be started. The problem thatthe parallel system is started unsuccessfully due to the fact that the pilot inverter is fixed, once a fault occurs in the pilot inverter within a starting process, a follow-up inverter cannot detecta parallel bus voltage is avoided.