9results about How to "Reduce the inductance value" patented technology

The invention provides a variable-inductance flyback transformer structure, which comprises a flyback transformer main body, a magnetic core is arranged on the outer package of the middle part of the flyback transformer main body, a main winding is fixedly mounted on the inner wall of the middle part of the magnetic core, a secondary winding sleeves the outer wall of a side column on one side of the magnetic core, and a high-low air gap is formed in the outer wall of a side column on the other side of the magnetic core; the stepped air gap or the slope air gap is arranged, and when the magnetic core is close to saturation, the inductance value is reduced; according to the flyback transformer, the step air gap or the slope air gap is utilized, the saturation effect in the magnetic core is gradually promoted from the narrow side of the air gap to the wide side, under the condition of low-voltage input, the magnetomotive force is large, the saturation is promoted to the wide position greatly, and the inductance value of the flyback transformer is reduced; and under the condition of high-voltage input, the magnetomotive force excited by the flyback transformer is relatively small, and the narrower side of the air gap is saturated or unsaturated, so that the inductance of the flyback transformer is reduced or even not reduced, and the optimization design of the variable inductance of the flyback transformer structure is realized.

The application belongs to the technical field of switching power supply, and an auxiliary circuit is added between two branches of a traditional two-phase Dickson converter; in a dead time when all main power tubes are closed, the auxiliary circuit can transfer the charge of one branch to another branch, realizes zero-voltage turn-on of all main power tubes, and reduces switching loss.

This invention provides a rod-shaped magnetic core and its preparation method, an inductor and its preparation method, and their applications, belonging to the field of non-destructive testing technology for inductor devices. The invention provides a method for preparing a rod-shaped magnetic core, comprising the following steps: filling a mold hole with nanocrystalline alloy wire along the extension direction of the mold hole; then infiltrating the gaps between the nanocrystalline alloy wire with epoxy resin for curing to obtain the rod-shaped magnetic core; the diameter of the nanocrystalline alloy wire is 0.05–0.2 mm; the diameter of the mold hole is 0.3–0.5 mm. The preparation method of this invention can prepare rod-shaped magnetic cores with a diameter of 0.2 mm or more, and the epoxy resin in this invention enhances the strength of the rod-shaped magnetic core, preventing it from breaking when wound with a coil. Furthermore, the rod-shaped magnetic core of this invention does not have the problems of uneven surface and burn-out layer, and does not reduce the relative permeability of the magnetic core.

The application belongs to the technical field of switching power supply, and relates to a cascaded switching capacitor converter. An auxiliary circuit is added between two branches outside a traditional cascaded converter. In a dead time when all main power tubes are closed, the auxiliary circuit can transfer the charge of one branch to another branch, realize zero-voltage turn-on of all main power tubes, and reduce switching loss.

This application belongs to the field of switching power supply technology, specifically relating to a switched capacitor converter. An auxiliary circuit is added between the two branches to transfer the charge of one branch to the other branch during the dead time when all main power transistors are off, thereby achieving zero-voltage turn-on of all main power transistors and reducing switching losses.

The utility model discloses a kind of Faraday rotator and magneto-optical switch for magneto-optical switch, it is related to optical device technical field, wherein, Faraday rotator includes coil framework, magneto-optical crystal and multiple magnetic field generating components;Magneto-optical crystal is located at coil framework;Multiple magnetic field generating components are connected in parallel, multiple magnetic field generating components are spaced and arranged side by side, and from one end of coil framework, the other end of coil framework is wound, and single-layer solenoid inductance structure is formed;The technical scheme provided by the utility model can solve the problems of poor heat dissipation performance and slow switching speed of existing magneto-optical switch.

The invention relates to the technical field of centrifugal blowers, in particular to a cost-reducing and efficiency-increasing control system and method for a magnetic suspension centrifugal blower unit, and the system comprises a cabinet body, a built-in mounting plate, a motor base and an electrical component, and the cabinet body is sequentially divided into a fan bin, a strong current bin, a weak current bin and a circuit breaker bin; the built-in mounting plate comprises a reactor mounting plate, a frequency converter mounting plate, an electrical element mounting plate, a magnetic controller mounting plate and a circuit breaker mounting plate. The cabinet body is divided into four bins, typesetting and deployment are carried out again, the length, width and height of the whole unit are reduced, all the bins are separated through the partition plates, current interaction is avoided, the built-in mounting plates are fixed to the partition plates, and the use space of the bin body is further reduced; the motor base is made of sheet metal parts, so that the whole motor base is lighter and more attractive; connection is established among the chambers for selecting more appropriate electrical components, so that the purposes of reducing cost and increasing efficiency are further achieved.

The invention discloses a five-level vibration table power supply and a prediction control method thereof. The method comprises a five-level converter, a first filter inductor, a second filter inductor and a filter capacitor which are bridged on two poles of a direct-current power supply, wherein the first filter inductor, the filter capacitor and the second filter inductor are connected in series and then connected to two output ports of the five-level converter, and a load is connected to the two ends of the filter capacitor in parallel. According to the five-level vibration table power supply topology, the inductance value of the filter inductor used in the device is about one half of the filter inductance value in a traditional single-phase two-level converter, the inductance value and the size of the filter inductor are greatly reduced, cost is saved, and the five-level vibration table power supply topology has good application prospects in a renewable energy power generation system. Meanwhile, an MPC control strategy is adopted, the stability, efficiency and electric energy quality of a power supply system are improved by minimizing a cost function and finding an optimal input index, and an output voltage waveform with certain quality is generated, so that more accurate and efficient electric power support is provided for a vibration test system.

The application discloses a soft switching method of a three-phase NPC three-level inverter. The application can realize zero-voltage turn-on of a power switching device of the three-phase NPC inverter through a frequency conversion control strategy, is high in reliability and easy to realize. The application does not need an auxiliary network, a sensor and a high-speed zero-crossing detection circuit, and no additional loss is generated except for a main circuit. In the application, a final critical switching frequency curve of the last synthesis is symmetrical, and the clamping state is symmetrical and the clamping angle is the same in each large sector, so that the midpoint capacitor voltage offset of the inverter is small, and the midpoint potential can be well balanced.