4results about How to "High current accuracy" patented technology

The invention relates to a permanent magnet synchronous motor control method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring stator voltage and stator current from the permanent magnet synchronous motor to the current moment, identifying a parameter vector of a data driving model which is trained for the permanent magnet synchronous motor in advance by utilizing each stator voltage and each stator current, and determining the current moment of the permanent magnet synchronous motor on the basis of the identified parameter vector and the data driving model. And obtaining a current prediction model for the permanent magnet synchronous motor, inputting the stator voltage and the stator current at the current moment into the current prediction model to obtain a predicted stator current at the future moment, and obtaining the predicted stator current at the future moment according to the predicted stator current at the future moment, the stator current at the current moment, the identified parameter vector and a preset objective function. And obtaining a target voltage vector at the future moment, and controlling the permanent magnet synchronous motor based on the target voltage vector at the future moment. By adopting the method, the prediction accuracy of the prediction model is improved, and the control accuracy of the permanent magnet synchronous motor is further improved.

The invention discloses a low-power consumption constant-current starting LED driving power supply, comprising a DC power supply module, a flyback power supply module, a control module, a constant-current starting module, an auxiliary power supply module, a switch switching module and a dimming module; the DC power supply module is used for converting an AC input into a DC bus voltage; the power input end and the power output end of the flyback power supply module are respectively connected to the DC bus voltage and an LED; the power end of the control module is used for receiving the starting voltage, the signal receiving end thereof is used for receiving an external signal, the signal output end thereof is connected to the driving end of the flyback power supply module and controls the on-off of the flyback power supply module; the power input end of the constant-current starting module is connected to the DC bus voltage, and the power output end thereof is connected to the power end of the control module; the switch switching module is used for pulling down the voltage of the first control end to turn off the constant-current starting module when the flyback power supply module is started, thereby achieving low power consumption and fast starting.

The utility model discloses a three-phase program-controlled alternating current power source, which relates to the field of three-phase program-controlled alternating current power sources and comprises a digital DSP (digital signal processor) controller + large-scale FPGA (field programmable gate array) module, a three-phase alternating current power output module, a three-phase remembered sine wave generating circuit, a touch screen, a liquid crystal display module, a low-pass filter A, a low-pass filter B and a low-pass filter C, and the touch screen and the liquid crystal display module are connected with the digital DSP controller and the large-scale FPGA module. According to the utility model, the three-phase power source adopts a DSP + FPGA technology, a large-scale FPGA with powerful and flexible functions, an internal and external phase-locked closed-loop control technology, a high-speed and high-precision D / A and a high-fidelity power amplifier to form a new-generation high-precision standard power source, the frequency stability is high, the continuity is good, the precision of output voltage and current can reach 0.01 level, and a single-phase 0-380V, three-phase three-wire, high-precision and high-precision standard power source can be provided. And the three-phase four-wire alternating current voltage is 0-380V.

The invention discloses a parallel current adding system, belongs to the technical field of electronic equipment for measurement and test, and solves the problem of how to design a parallel current adding system which is simple in hardware circuit and high in control precision. The parallel-connection current adding system comprises a plurality of single-machine current sampling circuits and a parallel-connection current adding circuit, the single-machine current sampling circuit comprises a first differential amplification circuit, a first proportional adjustment circuit, a first unit phase inverter circuit and a first digital potentiometer; the parallel current summing circuit comprises an instrument amplifier circuit, a second proportional adjusting circuit, a second unit phase inverting circuit, a second digital potentiometer and a plurality of proportional input end resistors; the digital potentiometers are applied to the parallel operation circuit, the amplification factor is adjusted by assigning the resistance values of the potentiometers according to the set parallel operation number, the mode that the amplification factor is adjusted by switching the resistance value of a single proportional resistor of a traditional resistance proportional circuit is replaced, a hardware circuit is simple, and amplification factor control is accurate.