4results about How to "Small current ripple" patented technology

The invention discloses a control method, device, equipment and system of an energy storage module and the energy storage module, and relates to the technical field of energy storage. The control method of the energy storage module comprises the following steps: acquiring bus current of the energy storage module and available current of a plurality of battery branches which are connected in parallel in the energy storage module; and controlling the target number of battery branches in the plurality of battery branches to be put into use according to the bus current and the available current of each battery branch. In the embodiment of the invention, the target number of battery branches in the plurality of battery branches are controlled to be put into use according to the bus current and the available current of each battery branch. In this way, the bus current can be actively distributed to the target number of battery branches, active distribution of the bus current is achieved, and the current pulsation of the battery branches is reduced. Moreover, each battery branch circuit put into use can work under the working condition close to the available current, and the utilization rate of the battery branch circuits can be improved.

The invention discloses a model-free control method for a driving motor of a deep-sea robot. The model-free control method comprises the following steps: acquiring the position, rotating speed and bus voltage of the motor and phase currents of different stator modules; acquiring a rotating speed sampling value to predict the rotating speed and rotating speed ring disturbance at the next moment; acquiring a rotating speed instruction, calculating an electromagnetic torque instruction by combining the rotating speed and a rotating speed loop disturbance prediction value, converting the electromagnetic torque instruction into a current instruction, and averagely distributing the current instruction to each stator module; injecting current into the d axis, and acquiring a current sampling value to predict current and current loop disturbance at the next moment; obtaining a current instruction and calculating a voltage instruction by combining the predicted values of the current and the current loop disturbance; obtaining a gradient function for an adaptive adjustment system and adaptively adjusting a coefficient based on a finite time gradient descent method; and S3, based on the voltage instruction in the step S3, generating a PWM pulse signal through coordinate transformation and space vector modulation, and driving each stator module inverter to control the operation of the motor.

The invention relates to the technical field of power electronic direct-current converters, in particular to an input and output common-ground high-gain boost converter which comprises a direct-current voltage source Vin, diode components D0-D4, capacitor components C0-C4, a first coupling inductor L1, a second coupling inductor L2, a first mosfet tube S1, a second mosfet tube S2 and a resistor R. The two main loops operate in a staggered mode, so that input current is continuous, input current ripples are small, relatively stable energy is continuously provided for the circuit, the voltage multiplication unit is adopted, the amplification factor of the circuit is increased, the duty ratio of the mosfet tubes S1 and S2 is adjusted, and small current ripples can be kept even under the condition that the boost factor is large. The device has the advantages of high step-up ratio, low device stress, high efficiency, easiness in control and implementation, lower cost and the like, and is suitable for a new energy power generation scene needing high direct current bus voltage grid-connected output under a low input voltage condition.

The application belongs to the technical field of inverters, and discloses a low-ripple soft-switching boost inverter and application thereof. The low-ripple soft-switching boost inverter is obtained by multiplexing the upper tube of a traditional two-phase buck / boost converter and the lower tube of a full-bridge inverter and adding an auxiliary inductor. The inverter can realize soft switching, has high conversion efficiency, low current ripple and low input inductor current stress. In addition, the input current ripple frequency is increased to twice the switching frequency, the size of the required filter device is reduced, and the system cost is reduced.