4results about How to "Strong work reliability" patented technology

This invention relates to a real-time monitoring and calibration method for the microwave channel of a digital T / R module, belonging to the field of radar technology. Test signals 1 and 2 are generated time-division according to calibration requirements and calibration timing. The electronic switch matrix contains at least four levels of electronic switches K1, K2, K3, and K4. The receiving channel of the transceiver filter module includes calibration status within the receiving subarray and receiving test status; the transmitting channel includes calibration status within the transmitting subarray and transmitting test status; the monitoring channel is mainly composed of the electronic switch matrix. During calibration within the receiving subarray, the digital T / R module is in the receiving test state. Real-time amplitude and phase calibration of the receiving channel is achieved by performing AD compensation on the test signal 1 area and the receiving working area of ​​the digital T / R module. During calibration within the transmitting subarray, the digital T / R module is in the transmitting test state. Real-time amplitude and phase calibration of the transmitting channel is achieved by performing AD compensation on the test signal 1 area and the receiving working area of ​​the digital T / R module. This greatly improves amplitude and phase stability and accuracy.

The application relates to a photovoltaic inversion system, which adopts an independent photovoltaic direct-current power supply as the input of the photovoltaic inversion system, and a first single-phase non-isolated double-buck inversion circuit and a second single-phase non-isolated double-buck inversion circuit are respectively connected with a photovoltaic direct-current power supply, forming a non-isolated photovoltaic inversion system. No additional switching device needs to be connected between the input end of the single-phase non-isolated double-buck inversion circuit and the photovoltaic direct-current power supply, and a voltage vector modulation strategy without a dead zone vector can be combined with a controller to maintain a low leakage current operation state of the photovoltaic inversion system and effectively inhibit the generation of common-mode current. The photovoltaic inversion system obtained through the above scheme not only has the advantages of small weight and volume, high power density and efficiency and low cost of the non-isolated inversion system, but also can effectively inhibit the generation of common-mode current, guarantee the quality of output electric energy and reduce the generation of electromagnetic interference, and has strong working reliability.

The present application relates to the technical field of constant current control of stepping motor, and particularly relates to a constant current control system and control method of stepping motor based on FPGA, comprising: an FPGA unit for generating a PWM control signal; a power amplifier circuit unit for amplifying the PWM control signal converted by a level conversion unit to drive the stepping motor; the FPGA unit is also used for generating a driving signal; a differential driving circuit unit for differentiating the driving signal converted by the level conversion unit to drive a Hall angular displacement sensor; the Hall angular displacement sensor collects rotor position information of the stepping motor, which is received by a differential receiving circuit unit, transmitted to the level conversion unit and then transmitted to the FPGA unit, and the FPGA unit reads the rotor position information of the stepping motor in real time. The present application does not need current sampling and comparison and other hardware and software function modules, reduces the complexity of the control system, and enhances the open-loop control advantage of the stepping motor.

The application discloses a slitting device with dust removal function, which comprises a machine body, a water spraying module, a slitting module and a dust removal module. The machine body is divided into upper and lower shells, and four guide wheels are arranged under the shells. The water spraying module is arranged at the front end of the machine body, a water tank is connected with a water guide pipe through a water pump, the slitting module is connected with a spring suspension at the middle part of the machine body, an oil return system is fixed on the outer wall of the suspension through a platform, an oil pump is connected with an oil tank and a reversing valve, the reversing valve is arranged at the bottom of the platform, the reversing valve is connected with an oil return cylinder and fixed on the side of the platform, the oil return cylinder is connected with the spring suspension, the two oil return cylinders of the oil return system are connected with each other, the oil return cylinder is connected with a clutch, the clutch is connected with an input and output shaft, centrifugal blocks are arranged on the output shaft, the input and output shafts are connected through bevel gears, and a belt drive is arranged between the engine and the bevel gears. The dust removal module is arranged at the end of the machine body, the engine is connected with dust removal blades of the dust removal module through a belt drive, the dust removal blades are fixed in a dust removal tank, and a filter screen is arranged on the dust removal port.