9results about How to "Achieving a soft start" patented technology

The utility model relates to a switch mode power supply (SMPS) and integrated circuit (IC) equipment, and aims to realize soft start of a buck converter. The integrated circuit device includes: a buck converter; a control circuit of a buck converter includes: a comparator comparing a feedback voltage of the buck converter with a reference voltage increased from a first voltage to a second voltage; a pulse width modulator generating a pulse width modulated (PWM) signal having a time-varying pulse width proportional to the reference voltage; an AND gate which generates a first control signal by performing logic AND operation on the output of the comparator and the PWM signal; a pulse generator generating a second control signal by generating a pulse in response to a rising edge in an output of the comparator; and a selection circuit selecting the first control signal or the second control signal as a control signal of the buck converter based on an output voltage of the buck converter. The utility model is used in a switch mode power supply (SMPS) and integrated circuit (IC) equipment.

The utility model discloses a motor soft start energy-saving control protection device, which is characterized in that when a motor is started, a switch unit controls the motor to be conducted with a frequency conversion unit, the frequency conversion unit controls the voltage frequency output to the motor to gradually rise from 0 to the voltage frequency of a power supply so as to realize the soft start of the motor, and then the switch unit performs switching so as to realize the soft start of the motor. The switch unit enables the motor to be directly connected with the power supply, at the moment, the frequency conversion unit stops working, the motor is directly connected with the power supply, after the motor is started, the current sampling unit can sample power supply current of the power supply to the motor, and when the power supply current is interrupted, the control unit can control the frequency conversion unit and the switch unit to work. And soft start of the motor is carried out again. According to the utility model, soft start of the motor can be realized, and the frequency conversion unit stops working after the motor is started so as to reduce extra electric energy loss.

This utility model provides a mine-use explosion-proof and intrinsically safe low-voltage contactless switch circuit, including: a main circuit, a control circuit, a transformer TC, and a comprehensive controller JZK1; the main circuit includes a reversing switch QS, one side of which is used to connect to the incoming three-phase live wires X1, X2, and X3, and the other side is connected to the power supply three-phase live wires XA, XB, and XC respectively through fuses KR1, KR2, and KR3; the first terminals of bidirectional thyristors MTC1, MTC2, and MTC3 are respectively connected to the power supply three-phase live wires XA, XB, and XC. The second terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the three-phase power terminals of the three-phase motor M1 via three-phase lines; the first and second terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the corresponding voltage detection terminals of the integrated controller JZK1; and the gate terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the corresponding gate control terminals of the integrated controller JZK1. This circuit is safer and more reliable for long-term use, and also realizes the soft-start function of the motor.

This application relates to the field of motor control technology and discloses a motor control method and system. The motor control method includes: upon detecting an AC zero-crossing, determining the electrical angle increment of the motor relative to the previous AC zero-crossing; determining the electrical angle of the current AC zero-crossing based on the electrical angle of the previous AC zero-crossing and the electrical angle increment; determining the target phase path that needs to be turned on based on the comparison results of the electrical angle of the current AC zero-crossing with multiple conduction control intervals; and controlling the target phase path to be turned on at the current AC zero-crossing. This motor control method, through precise electrical angle tracking and zero-crossing synchronized phase-by-phase conduction control, can reduce the instantaneous current during motor startup, effectively limit current surges, alleviate transient stress on channel devices, lines, and the load body, and achieve soft starting of the motor.

The invention discloses a mining vehicle engine maintenance platform which comprises a base assembly, an adjusting box, a driving assembly, braking assemblies, a driven structure and an auxiliary support, the adjusting box is fixedly connected to the top of the base assembly, the driving assembly and the braking assemblies are both located in the adjusting box, the braking assemblies are arranged on the two sides of the driving assembly, and the driven structure is arranged on the auxiliary support. The driven structure is arranged on one side of the adjusting box, and the brake assembly drives the driven structure to rotate. The invention belongs to the technical field of mine car overhauling, and particularly relates to an engine overhauling platform of a mine vehicle. By arranging the driving assembly and the braking assembly, the engine can be driven to slowly speed up and brake when the angle of the engine is adjusted, so that the stability of the engine during overhauling is ensured, and the problem that impact is caused when the overhauling angle of the mine car engine is adjusted on an overhauling platform at present is effectively solved.

The invention belongs to the technical field of power supply, and particularly relates to an overvoltage protection circuit. The input end is used for being connected with a power adapter, the output end is used for being connected with a load, the first switching device is connected between the input end and the output end in series, the control unit is connected with the controlled end of the first switching device, and the control unit is used for detecting whether the voltage of the output end of the power adapter exceeds a voltage threshold value or not. The first switching device is controlled to be switched off under the condition that a voltage threshold value is exceeded, the first switching device is controlled to be switched on under the condition that the voltage threshold value is not exceeded, the voltage threshold value is larger than the rated voltage of the load, the difference between the voltage threshold value and the rated voltage of the load is smaller than a voltage difference threshold value, and the voltage difference threshold value is larger than 0. By adopting the overvoltage protection circuit provided by the invention, the connection between the power adapter and the load can be cut off at the first time under the condition that the power adapter of which the output end voltage is greater than the rated voltage of the load is used for charging the load, so that the problem that the load is burnt out due to overvoltage is avoided.

The application discloses a metro pulse passenger flow-oriented escalator control method, equipment and medium, the method comprises the following steps: according to metro train operation data, construct the pulse passenger flow trigger sequence based on discrete events, calculate the continuous passenger flow injection curve arriving at the entrance of the escalator;The future dynamic load torque of the escalator is predicted by using PINN network;In combination with the predicted dynamic load torque, the minimum system operation energy consumption, mechanical wear and queuing congestion penalty are taken as the comprehensive target, the multi-objective nonlinear model predictive control optimization problem is constructed and solved, the optimal speed control instruction is generated and issued to the escalator frequency converter for execution.The application can accurately reconstruct the real-time quality distribution on the escalator, and calculate the future dynamic load torque accordingly, and the controller adjusts the motor operation accordingly, so that it always works at the optimal slip frequency point, reduces the energy consumption of the escalator, reduces the wear of parts, prolongs the service life.

This application relates to the field of traditional Chinese medicine massage devices, and discloses a traditional Chinese medicine pediatric massage device, including a massage bed and a moving mechanism for moving the massage structure along the XYZ axes. A switching mechanism for switching different massage modes is installed on one side of the moving mechanism. The switching mechanism includes a geared motor, and the output shaft of the geared motor is connected to a drive gear via a coupling. By selectively energizing an electromagnet in any magnetic coupling structure through a control unit, the friction connection at the bottom of that structure gains power, while the other two mechanisms remain in a free-running, separated state. This structural design allows the same device to freely switch between three completely different traditional Chinese medicine massage techniques—reciprocating acupressure, rotary kneading, and linear reciprocating rubbing—as needed for massage therapy. Compared to existing single rolling massage techniques, this device integrates multiple massage techniques, possessing comprehensive therapeutic capabilities and significantly improving the targeting and clinical efficacy of massage therapy.

An eddy current transmission stepless speed change type tidal current generator set belongs to the field of tidal current / ocean current power generation, and comprises a tidal current impeller, a main transmission shaft, a planetary gear train, an electromagnetic eddy current assembly and a permanent magnet generator, the tidal current impeller is used for converting captured ocean current kinetic energy into mechanical kinetic energy of the planetary gear train, and the tidal current impeller is fixedly connected with the main transmission shaft; the main transmission shaft is connected with the input side of the planetary gear train, the output side of the planetary gear train is connected with a copper disc rotor of the electromagnetic eddy current assembly, a permanent magnet disc rotor of the electromagnetic eddy current assembly is in transmission connection with the permanent magnet generator through the parallel shaft gear train, and the permanent magnet disc rotor and the copper disc rotor can freely and relatively rotate. The device is simple, compact, stepless and continuous in speed change and high in efficiency.