8results about How to "Simple control strategy" patented technology

The invention discloses a double-transistor flyback circuit control method, circuit and chip, and the method comprises the steps: a drive controller detects whether a drive power supply of a first switching tube needs to be forcibly charged, if yes, a second pin is controlled to output a high level, and if not, a second pin is controlled to output a high level; the second pin is controlled to charge a driving power supply of the first switch tube through a power supply connected with the third pin, after charging is completed, the second pin is controlled to output a low level, otherwise, the second pin and the first pin are controlled to output a high level at the same time, so that the second switch tube and the first switch tube are turned on at the same time; when a signal for turning off the switching tube is detected, the first pin is controlled to output a low level to turn off the first switching tube, and the second pin is controlled to output a low level to turn off the second switching tube after waiting for a first preset time.

This invention discloses a direct control method for torque and axial force of a linear rotary switched reluctance motor. First, the sector containing the flux linkage vector is determined through calculation. Based on the flux linkage hysteresis signal and the torque hysteresis signal, the voltage vector required for control is determined. Then, the axial force is controlled within the control range of (-15°, 15°) where the rotor position is selected. The corresponding axial force voltage vector is selected based on the axial force hysteresis signal. Finally, the operating mode of each power converter switch is determined based on the signs of all voltage vectors. This invention significantly reduces torque and axial force pulsation by directly controlling the motor's torque and axial force, resulting in a faster system response. Operating modes for the torque winding and axial force winding are established separately for torque and axial force, respectively, leading to more reasonable vector selection. Furthermore, no model calculation is performed during the control process, so the control accuracy does not depend on the analytical model, improving the system response speed and simplifying the control strategy.

The application discloses a kind of all-around intelligent flexible ultrasonic transducer detection device and method, belong to medical ultrasonic detection technical field, the present application is by upper protective layer, metal shielding layer, insulating filler layer, upper layer printing electrode, piezoelectric layer, lower layer printing electrode, lower protective layer composition, wherein piezoelectric layer is by many piezoelectric array element composition radial multilayer ring belt, printing electrode layer is flexible electrode with "spider web structure" and "island-bridge" structure, metal shielding layer is added between protective layer and insulating layer absorption and reflection external electromagnetic wave;Annular positive pole is always connected with ultrasonic acquisition card channel, only need to make negative pole channel alternate connection, different angle radial array element can be made to work simultaneously, can be automatically attached skin, with flexibility and stretch performance, simultaneously using "ring-diameter" addressing flexible circuit design and addressing mode, less occupied ultrasonic acquisition card channel, and can realize automatic multiple position and multiple angle all-around ultrasonic detection.

The invention relates to the technical field of semitrailers, in particular to a new energy driven particle powder material transportation semitrailer which comprises a data acquisition system, a data analysis system, a control system and a correction system. The data acquisition system acquires a parameter set and road condition information; the data analysis system judges a dominant abnormal state based on the pressure gradient and the electrification rate, and judges a recessive abnormal state based on the response amplitude; the control system adjusts torque distribution of a driving shaft or suspension damping based on the cooperation coefficient during dominant abnormity, and adjusts the suspension height and / or in-tank auxiliary vibration frequency based on the response damping ratio during implicit abnormity; and the correction system calculates the comprehensive change rate after the primary adjustment, and dynamically adjusts the preset comprehensive change rate in combination with the road condition information to judge whether the secondary adjustment is performed or not. According to the method, explicit and implicit abnormity accurate identification and secondary adjustment optimization in the particle powder material transportation process are achieved, and the transportation safety and the material fluidity are effectively improved.

This application relates to the field of control rod drive mechanism testing technology, specifically, to a drive mechanism testing system employing an overrunning clutch. The system includes a base, a fixed bracket, a long shaft, a photoelectric encoder, a magnetic powder brake, a torque sensor, an inertia disk, an overrunning clutch, a control mechanism, and a drive mechanism. The photoelectric encoder is fixed to the left side of the photoelectric encoder bracket; the magnetic powder brake is positioned between the photoelectric encoder bracket and the inertia bracket, and the torque sensor is positioned outside the magnetic powder brake; the long shaft is positioned between the inertia bracket and the clutch bracket; the inertia disk is connected to the long shaft via a key; the overrunning clutch is positioned between the clutch bracket and the mechanism bracket; the control mechanism is located above the overrunning clutch; and the drive mechanism is fixed to the right side of the mechanism bracket. This application simplifies the operation of the drive mechanism by utilizing the overrunning clutch, requiring only the detection of the drive mechanism's initial and final positions, and using the time difference to calculate the drive mechanism's reset time.

The application provides a dual-source power mine truck isolation type DCDC control method, system and medium, the method comprises the following steps: step 1: the monitoring and comparison of the battery pack state of charge; step 2: the generation of the current reference value; step 3: comparing the current reference value with the actual DC output current feedback value to obtain the current error value, using the deadbeat predictive control algorithm to process the current error value to obtain the outward moving phase angle, and controlling the current flow between each battery pack by real-time adjustment of the outward moving phase angle.The application has the advantages of high efficiency, low maintenance cost, etc., can effectively suppress the electromagnetic interference between the dual-source power circuits, ensure the stable operation of the mine truck, optimize the battery pack energy management, improve the power utilization rate, and ensure that each component can obtain the required appropriate power.

The application discloses a kind of full-power fuel cell hybrid power system high-efficiency control method, belong to control technical field;Including the following steps: obtaining the current operating parameters of vehicle, and hydrogen fuel cell operating parameter, according to the demand information obtained, calculate the demand information of vehicle and hydrogen fuel cell operating information, and then determine the current operating state of vehicle and the current working state of hydrogen fuel cell;In different vehicle operating state, according to the calculated vehicle demand information and hydrogen fuel cell working state, determine whether to switch the working state of hydrogen fuel cell;According to the determination result, switch the working state of hydrogen fuel cell, so that hydrogen fuel cell works in the most efficient area.The application can make hydrogen fuel cell in the case of participating in work as far as possible in the best working area, so that the performance of hydrogen fuel cell is in higher area, effectively improves the overall efficiency of vehicle;Control strategy is simple, real-time good.

This invention relates to wireless power transfer technology, specifically a single-tube inverter AC envelope modulation wireless power transfer system and control method. The system includes a transmitter and a receiver. The transmitter includes an input AC power supply, a dual-winding AC transformer, a rectifier and filter circuit, a DC / DC module, a single-tube inverter transmitter circuit, a first control module, and a drive circuit module. The receiver includes a receiving circuit, a high-frequency envelope demodulation network, an electrical load, a zero-crossing detection module, and a second control module. The zero-crossing detection module detects the output envelope voltage state to obtain a control signal, and the first control module controls the step-up / step-down state of the DC / DC module based on the envelope state. The advantages are: compared to traditional AC-AC envelope modulation wireless power transfer systems, it further simplifies the circuit structure, reduces the number of switching devices and the drive circuit, further simplifies the control strategy, reduces the harmonic content on the system input side, increases the power factor, and reduces the impact of the input voltage waveform.