30results about How to "Increase the current level" patented technology

The invention discloses a cascaded multi-level power electronic transformer based on DSP (Digital Signal Processor)/FPGA (Field Programmable Gate Array) cooperative control, comprising a pre-stage rectification-level circuit, a middle isolation-level circuit, a rear-stage inversion-level circuit and a cooperative control module. Power frequency alternating current is rectified to generate first direct current via the pre-stage rectification-level circuit, the first direct current is modulated via the middle isolation-level circuit to generate high frequency square wave alternating current, the high frequency square wave alternating current is subjected to voltage grade conversion, isolation and demodulation via a high-frequency transformer to generate second direct current, and the second direct current is inverted via the rear-stage inversion-level circuit to output required alternating current. The cooperative module comprises a DSP module and an FPGA module and is used for controlling PWM (Pulse-Width Modulation) waves of the pre-stage rectification-level circuit, the middle isolation-level circuit and the rear-stage inversion-level circuit respectively. The cascaded multi-level power electronic transformer provided by the invention provides enough PWM ports to achieve circuit integration, achieves bidirectional energy flow, reactive compensation, quality control of electric energy and access of renewable energy source and energy storage equipment, is suitable for high-voltage and large-power places, can reduce output harmonic waves without improving the switching frequency, reduces loss and is free of voltage-sharing problems.

The invention relates to the vacuum circuit breaker technical field, more specifically a vacuum explosion chamber and a contact structure thereof. The contact structure comprises a cathode contact and an anode contact oppositely arranged; the end surface of the cathode contact and the end surface of the anode contact are curve revolution surfaces or curve straight surfaces mutually corresponding, and end surfaces transit smoothly. The contact structure can increase end surface contact areas, promote arcs to convert into a diffusion state, increase contacting areas of contacts, arcing areas and back-arc condensation remaining plasma and metal steam areas when a contact diameter is fixed, and furthermore improve a vacuum explosion chamber cut-off capability, and reduce a vacuum switch size.

The invention provides a microsecond electronic switch apparatus. The microsecond electronic switch apparatus comprises two IGBTs, two diodes, five heat dissipation plates, two press-mounting plates,an absorption capacitor and a direct-current bus capacitor group, thereby finally implementing microsecond turn-off. According to the microsecond electronic switch apparatus, the microsecond protection can be implemented; moreover, a protected current grade is relatively high and can be up to a grade of a current flowing through a device in a testing process; the microsecond electronic switch apparatus can implement the effects that when the protection switch is turned off, an overvoltage is relatively low, the voltage equalization performance is good, and an output voltage and an output current can be improved to a required range; not only is the cost saved, but an inductance value of a parasitic inductor also is reduced; and the diode and the absorption capacitor are arranged, so the possibility that the device is broken through by the overvoltage is avoided, and the voltage equalization is implemented via a static partial voltage of an equalization resistor.

The invention discloses a rapid interface device for conveying super-heavy current, comprising a seat body whose sidewall is provided with a horizontal plug. The bottom part and the top part of the horizontal plug are respectively provided with a first electrode block and a third electrode block. The bottom part of the third electrode block is provided with a first arc guiding groove. The top partof the first electrode block is provided with a second arc guiding groove. The bottom part of the seat body is provided with a longitudinal cavity communicated with the horizontal plug, and the longitudinal cavity is provided with a movable clamping block and a spring seat. The bottom part of the movable clamping block is provided with an inserting rod. The top part of the spring seat is providedwith an inserting hole matching with the inserting rod. The inserting rod is sleeved by a belleville spring. The top part of the movable clamping block is connected to the first electrode block. Twosides of the spring seat are respectively provided with a connecting shaft extending outside of first waist-type holes at two sides of the seat body. Two sides of the seat body are respectively provided with a hoisting structure connected to the connecting shaft. The invention is advantageous in that plugging is rapid and convenient, connecting is stable; the device can be suitable for hostile working environment in the field; safety and practicality of the device can be improved; the device can be widely applied in the field of electrical connection.

The invention discloses a high-current DC contactor comprising two sets of DC contact bodies and a set of electromagnetic driving mechanism. A DC contact mechanism includes an arc extinguishing chamber (1), a magnetic blowing system (2), a spring system (3), a magnetic conducting plate (6), a static contact (7), a moving contact (8), a conductive copper row (9), a support base (10), a micro switchassembly (11), and a contactor shell (12). The electromagnetic drive mechanism includes a guide driving block (4), an electromagnet (5) and a base (18). A form of a snap-type electromagnet which is often used in existing products on the market is changed, a suction-type electromagnet is used as a power element, with a redesigned driving system, the space is saved as much as possible in the same breaking capacity, the requirements of a railway locomotive for dimensions are satisfied, the effective insulation distance of a contactor is ensured, and the current level of the contact is improved.

The invention provides a slotless brushless grooved drum permanent magnet synchronous motor comprising a special controller and a rotary transformer, and relates to the field of motors. The slotless brushless groove drum permanent magnet synchronous motor with the special controller and the rotary transformer is provided, the motor comprises a motor shell, a motor rear cover and a motor front cover, wherein the motor front cover and the motor rear cover are fixedly connected with a front end and a rear end of the motor shell respectively, a rear boss is fixedly arranged at the position, closeto the center of a side wall of a front end, of the motor rear cover, a front boss is fixedly arranged at the position, close to the center of a side wall of the rear end, of the motor front cover, afront bearing is arranged at an inner end of a front boss, a rear bearing is arranged at an inner end of a rear boss, and a main shaft is rotationally arranged at an inner end of the front bearing. The slotless brushless groove drum permanent magnet synchronous motor is advantaged in that by using the slotless and brushless grooved drum permanent magnet synchronous motor with the special controller and the rotary transformer, overall structure complexity of the motor can be reduced, production is convenient, and working efficiency, working precision and the overload capacity of the motor are improved.

The invention discloses a moving contact clamping structure for a circuit breaker. The moving contact clamping structure comprises a conductive bracket and two moving contacts; the two moving contacts are mounted on the conductive bracket through a rotary shaft, wherein an elastic ring which can be deformable radially is mounted on the rotary shaft between the two moving contacts; a limiting part used for limiting the two moving contacts is mounted on the conductive bracket; and the outer side walls of the two moving contacts are in tight contact with the conductive bracket in a plane-to-plane manner through radial elastic force generated by the elastic ring. The moving contact clamping structure for the circuit breaker is simple in structure, low in cost, stable and reliable in clamping, capable of remarkably reducing dimensions of the elastic part under the premise of not reducing the clamping force of the moving contact structure, so as to reserve more space to enlarge sectional areas of conductive loops of the moving contacts and other parts, and capable of lowering internal resistance of the loop and laying foundation for improving the current level of a shell frame.

It provides a power unit including: a multi-phase bridge rectifier, having inputs being electrically connectable to a source of multi-phase AC power; a smoothing filter, being connected to an output of said multi-phase bridge rectifier; and a multiple of H-bridge inverters; wherein: input terminals of said multiple of H-bridge inverters are electrically connected in parallel with said smoothing filter; and output terminals of said multiple of H-bridge inverters are electrically connected in parallel and are adapted for providing a single-phase output to an AC load. By having the power unit, it has one three-phase bridge rectifier thus it is helpful for eliminating the current sharing issues occurring among more than one three-phase bridge rectifiers. In addition, by having three H-bridge inverters electrically connected in parallel in the power unit, the current rate for the power unit is increased as compared with that with one H-bridge inverter. Preferably, a multiple of pre- charging resistors can respectively arranged between said output of said respective one of said multiple of legs of said multi-phase bridge rectifier and said respective one of said multiple of capacitor banks.

The invention discloses an elastic sub-module and a modular crimping type semiconductor module. The elastic sub-module comprises a conducting strip, an insulating elastic piece and a conducting plate, the conducting strip is a bent conducting strip which is bent to be provided with a plurality of grooves, the conducting strip is clamped at the upper end of the insulating elastic piece through the grooves, and the lower end of the insulating elastic piece is connected with the conducting plate; the modular crimping type semiconductor module comprises a module collector plate, a chip sub-module, a module emitting polar plate and an elastic sub-module; the chip sub-module comprises a chip, a collector conductor and an emitter conductor; and the module collector electrode plate, the collector electrode conductor, the chip, the emitter electrode conductor, the elastic sub-module and the module emitter electrode plate are sequentially connected from top to bottom. The module has the advantages that the thermal resistance can be further reduced and the power density and the current level of the module can be improved through a chip modularization form; and the modularization of the chip subunits can also reduce the material cost and reduce the processing procedures.

A method for actuating a valve with a magnetic valve drive, through which electric current(1) is passed to open the valve, to close the valve, and to hold the valve in an open or closed position, includes a)receiving an opening signal. The method further includes b)varying the electric current that is passed through the valve drive as a first current signal(2) to open the valve in response to thereceived opening signal. The method further includes c)receiving a closing signal and varying the electric current that is passed through the valve drive as a second current signal(3) for closing thevalve in response to the received closing signal. The second current signal(3) has at least two variations of the electric current(1) at separate times.

The invention discloses an automatic mine switch. The automatic mine switch comprises a plastic base, a plastic upper cover, a wiring assembly, a contact system, an operation mechanism, an arc extinction mechanism and a trip device, wherein the wiring assembly, the contact system, the operation mechanism, the arc extinction mechanism and the trip device are arranged on the base. The contact system comprises three fixed contacts and three moving contacts. The operation mechanism drives the three moving contacts to achieve synchronous switch-on-off movements. The arc extinction mechanism comprises three arc extinction covers which are matched with the three moving contacts. The wiring assembly comprises a first wire inlet terminal connected with the first fixed contact, a second wire inlet terminal connected with the second fixed contact, a third wire inlet terminal connected with the third fixed contact, a first wire outlet terminal connected with the first moving contact, a second wire outlet terminal connected with the second moving contact, and a third wire outlet terminal connected with the third moving contact. The first wire outlet terminal is in short circuit connection with the second wire outlet terminal, and the second wire inlet terminal is in short circuit connection with the third wire inlet terminal. Compared with a traditional product, the automatic mine switch greatly improves grades of rated working voltage and current.