8results about How to "Eliminate circulation" patented technology

The invention discloses a model prediction control method and system for a parallel light storage power spring, and belongs to the field of power electronics. The model prediction control method for the parallel light storage power spring comprises the following steps: on the basis of a power spring, adding a light storage system to replace an ideal voltage source, and on the basis of a single light storage power spring, constructing the parallel light storage power spring by connecting a plurality of power springs in parallel; the optical storage system is adjusted to output stable voltage; a phase-locked loop is adopted to generate a voltage reference value of the key load; on the basis of controlling the stability of the key load voltage, the key load voltage is stabilized to a voltage reference value through the prediction control of the parallel light storage power spring model, and the ring current is eliminated. According to the method, under the condition of multiple fluctuations, the voltage can still be accurately controlled to be stable without parameter adjustment by adopting multi-agent-based model prediction control, and the circulating current is eliminated on the basis.

The invention relates to the technical field of electric power, in particular to a power supply zero-sensing switching method and system based on phase real-time tracking, and the method comprises the following steps: collecting the communication connection state of each inverter node in a micro-grid group, constructing a communication topology model of the micro-grid group, and analyzing a sparse communication connection relationship among the nodes in the communication topology model, and generating a Laplacian matrix reflecting node connectivity according to the sparse communication connection relationship. According to the method, the system state can be comprehensively evaluated from the two dimensions of external alignment precision and internal stability, and misjudgment caused by a single index is avoided. Dual errors are input into a switching stability evaluation model to calculate a stability index, and a switching instruction is generated only when the index exceeds a grid-connected permission threshold value, so that quantitative decision and strict control of a grid-connected opportunity are realized, and the micro-grid and a main grid are highly synchronous in phase and frequency at the moment that a circuit breaker is closed; and transient impact and circulation at the switching-on moment are eliminated.

This invention relates to the field of automotive battery management technology, specifically to a non-intrusive parallel safety control device and method for auxiliary batteries in electric vehicles. The device includes a three-terminal parallel connection component, a boost converter module, a dual 12V signal detection module, a control module, and a power switch array. The three-terminal component reuses the original vehicle's high-voltage bus, the boost module adapts to the low-voltage auxiliary battery, and uses optocoupler isolation to detect charging and ignition signals. The control module executes electrically independent control logic, only turning on the power switch array during charging and discharging to achieve coordinated operation, and disconnecting it at other times to maintain electrical independence between the main and auxiliary batteries. This application eliminates the safety hazards of long-term parallel connection of new and old batteries without modifying the original vehicle's protocol and circuitry, ensuring the original manufacturer's warranty, and achieving intelligent range expansion and charging management.

The stator assembly comprises a stator core and stator windings, 54 stator grooves are arranged on the stator core, the stator windings are arranged in the stator grooves, the number of layers of the stator windings is N, N is larger than or equal to 3 and is an odd number, the stator windings are three-phase stator windings, each stator winding comprises a hairpin end and a welding end, and the hairpin ends and the welding ends are arranged in the stator grooves. The span of the hairpin end is 8 stator slots or 11 stator slots, and the span of the welding end is 9 stator slots; one phase of the stator winding comprises a plurality of symmetrical branches which are connected in series or in parallel. Compared with the prior art, the flat wire motor has the advantages that the whole-pitch winding arrangement of the flat wire motor with 54 slots, 6 poles and odd flat wire layers is realized; the number of layers is odd, so that the problem of large span of the number of turns of even layers is solved, and the optimal performance, size and cost of the motor are realized; and the arrangement mode of the stator windings is that branches are symmetrical, and ring current between the branches is eliminated.

The guide vane of the centrifugal pump comprises a guide vane disc, the guide vane disc is vertically arranged, the right side of the guide vane disc is provided with a plurality of reverse vanes which are distributed around the center point of the guide vane disc, the reverse vanes are in an arc shape, the ends, close to the outer side of the guide vane disc, of the reverse vanes are in a twisted shape, and a liquid flow channel is formed between any two adjacent reverse vanes. A plurality of positive blades distributed around the center point of the guide blade disc are arranged on the left side of the guide blade disc, each positive blade is in an arc shape, one end of each positive blade extends to the right side of the guide blade disc, the end, extending to the right side of the guide blade disc, of each positive blade is in a twisted shape, and a liquid expansion flow channel is formed between any adjacent positive blades. The device has the advantages that liquid impact and vortex hydraulic loss in the liquid expansion flow channel can be reduced, the circulation of liquid circumferential rotation is eliminated, a cover-plate-free open structure is adopted, the flow channel is convenient to process after blank casting, the surface precision of the flow channel is high, and the efficiency is high.

The stator assembly comprises a stator iron core and stator windings, 72 stator grooves are arranged on the stator iron core, the stator windings are arranged in the stator grooves, the number of layers of the stator windings is 2M, M = {1, 2, 3,...}, the stator windings are three-phase stator windings, the hairpin end span is four stator grooves or six stator grooves, and the stator winding is a three-phase stator winding. The span of the welding end is seven stator slots; one phase of the stator winding comprises a plurality of symmetrical branches which are connected in series or in parallel or in series and in parallel. Compared with the prior art, the utility model has the advantages that the hairpin end span is short, the resistance is small, fifth and seventh harmonics are weakened, the efficiency of the motor is improved, the NVH (Noise Vibration and Harshness) performance of the motor is optimized, and the space and materials are saved; the spans of the card issuing end are arranged in a large-small staggered manner, so that circulating current between branches is eliminated; through the welding end copper bar, the arrangement structure of different branches can be realized without changing the span arrangement of the hairpin end and the welding end, and the processing is convenient.

The present application discloses an IGBT driving protection circuit, a driving circuit, a driver and a testing device. A differential circuit outputs a first pulse signal when an input control signal jumps from a high level to a low level. An integrating circuit integrates the first pulse signal and outputs a first integrated signal of a first preset duration. A first control circuit generates a first control signal of a second preset duration according to the first integrated signal of the first preset duration and outputs the signal to a gate of the IGBT circuit, so that the gate of the IGBT circuit is reversely biased for the second preset duration, so that the IGBT circuit is in a cut-off state. The gate of the IGBT circuit stops being reversely biased after the second preset duration, thereby avoiding that the emitter of the IGBT circuit forms a current path with the gate of the IGBT circuit through the power supply ground when the IGBT circuit breaks down, and eliminating the loop current formed between the IGBT circuit and the internal power supply when the IGBT circuit is short-circuited.

The utility model discloses a kind of test fixture of remote controller detection equipment, including shielding shell, bearing assembly and pressure component. Shielding shell includes base portion and lid portion, lid portion is driven by opening and closing driving member to open and close;Bearing assembly is located in base portion, including bottom plate, detection substrate and bearing plate, bearing plate is equipped with positioning area, detection substrate is equipped with signal acquisition terminal, bearing plate is equipped with avoiding hole correspondingly;Bearing plate is supported by elastic reset piece floating, when being pressed, it can be floated downward to make the remote controller to be measured and signal acquisition terminal contact conduction;Pressure component is driven by linear drive device and moves downward, and it can be marked after test by integrated physical marker executor synchronously by applying pressure force.The utility model absorbs remote controller tolerance by floating bearing structure, guarantees contact reliability;Test and marking are completed in same station, and integration degree is high;Shielding shell and fixture are integrated, and structure is compact.