34results about How to "Reduce current fluctuations" patented technology

A charging circuit for an energy storage device having an inductive transmitter element designed to inductively receive a charging AC voltage. In one embodiment, a rectifier is coupled to the inductive transmitter element and designed to convert the received charging AC voltage into a charging DC voltage. The energy storage device has at least one energy supply section coupled between two output connections of the energy storage device. The energy supply section has one or more energy storage modules connected in series in the power supply section. The energy storage modules each have an energy storage cell module having at least one energy storage cell, and a coupling device having a large number of coupling elements.

The invention discloses a multi-channel electromagnetic valve current acquisition device which is composed of a single-chip microcomputer A / D processing module (1), a CAN communication module (2), a computer communication module (3), an amplifying circuit module (4), a sampling resistor module (5) and an external circuit module (6), wherein, a sampling resistor selects a precise resistor and is connected in series with an electromagnetic valve circuit which needs to be measured, the both ends thereof are respectively connected with a first-grade operational amplifier, the first-grade operational amplifier extracts the micro-pressure drop at the both ends of the sampling resistor and sends to a second-grade operational amplifier after the regulation of the adjustment amplification times ofthe resistor, a filter resistor and a filter capacitor carries out the filtration of the amplified signals, and the results are sent to the single-chip microcomputer A / D processing module. Then, the processed signals are sent to an upper computer through the CAN communication module. The invention further discloses a method for carrying out the acquisition by adopting the acquisition device. The multi-channel electromagnetic valve current acquisition device has the advantages of high negative voltage resistance, flexible adjustment of the amplification times, high communication speed and highsampling precision.

The invention discloses an asynchronous motor model prediction direct torque control method, and relates to the technical field of motor control. Two control methods are improved through the mode of partition prediction and table lookup on the basis of comparative research of the performance of two control methods. According to the method, the system performance can be further improved, and the transient and steady-state torque ripple, stator flux linkage and current fluctuation of the motor can be significantly reduced. The simulation result proves that the torque, the flux linkage and the current fluctuation of the conventional DTC can be effectively reduced by the novel DTC strategy, the advantages of rapid response and simple control of the conventional DTC can be maintained and the control performance of the conventional DTC can be improved; meanwhile, vector selection is performed through combination of the partition table so that the dependence of finite model prediction controlon the model parameter accuracy can be reduced, and online computation of finite model prediction control can also be greatly reduced.