44results about How to "Small reactance" patented technology

The invention discloses a subsynchronous resonance TCSC (Thyristor Controlled Series Compensation) device of a transmission line inhibition system. The invention provides a controllable series compensation technology. A power transmission line is additionally provided with a controllable thyristor valve; a series condenser block and an inductor controlled by the thyristor valve are connected in parallel so as to form the TCSC device. The thyristor valve is a controllable element, so that the slide control over the total impedance of the TCSC device can be realized by virtue of controlling the conduction and the shutoff of a thyristor in the thyristor valve; and compared with fixed series compensation, the subsynchronous resonance of the system can be inhibited more effectively, the transmitting capacity and the transient stability of the system are improved, and the effects of reducing the linear reactance and improving the power distribution can be achieved.

A small-size omnidirectional broadband dual-polarized MIMO antenna is composed of a horizontal polarization unit and a vertical polarization unit, wherein the horizontal polarization unit and the vertical polarization unit perform independent electric feeding, wherein the horizontal polarization unit is composed of four printed arc-shaped dipoles, a broadband balance-unbalance feed network, four arc-shaped parasitic wires and four double-L-shaped parasitic wires. The vertical polarization unit is composed of a discone, a circular sleeve and a grounded top loading planar ring. The working frequency band of the horizontal polarization unit is 1.7-2.8GHz; 48.9% relative bandwidth and a stable gain of 2.0-2.35dBi can be realized. The working frequency band of the vertical polarization unit is 1.68-2.72GHz; 48.9% relative bandwidth and a stable gain of 2.0-3.5dBi can be realized. Furthermore isolation degree between two radiation units is 25dB. The cross polarizations of the two radiation units are smaller than 20dB. According to the antenna, a horizontal radiation unit has a planar structure and a 50-ohm coaxial cable is utilized for performing electric feeding, and the dimension of the horizontal radiation unit is smaller than 100*100mm<2>; a vertical radiation unit has a discone structure and a 50-ohm coaxial cable is utilized for performing electric feeding, and the size of the vertical radiation unit is smaller than 84*84*22 mm<3>. The broadband dual-polarized omnidirectional MIMO antenna is suitable for a 4G LTE wireless communication system, a network and a base station.

The invention relates to a short circuit current limiter controlled by current transformers. A saturated reactor comprises a reactance coil L1 and a direct current coil L2, and the reactance coil L1 and the direct current coil L2 perform interaction through a closed-loop iron core in the saturated reactor; the current transformer I comprises a primary coil L3 and a secondary coil L4; the current transformer II comprises a primary coil L5 and a secondary coil L6; the reactance coil L1, the coil L3 of the current transformer and the coil L5 are connected in series, and the reactance coil L1 andretaining terminals in the primary coils of the current transformers are used as input and output terminals of a device; the secondary coils of the two current transformers are connected in parallel and then connected with the two input ends of a full-bridge rectification circuit; and the output end of the rectification circuit is connected with the direct current coil L2 in series so as to form a closed loop. A piezoresistor R1 and a capacitor C1 are further connected at two ends of the direct current coil L2 in parallel.

The invention relates to a split reactor with two symmetric branches. A first branch of the split reactor is formed by sequentially connecting an upper external coil lead, an upper external coil, a first intermediate lead, a lower internal coil and a lower internal coil lead in series, a second branch of the split reactor is formed by sequentially connecting an upper internal coil lead, an upper internal coil, a second intermediate lead, a lower external coil and a lower external coil lead in series, and the first branch and the second branch of the split reactor are symmetric in structure; and when a circuit is connected, the upper external coil lead and the upper internal coil lead are connected, the lower external coil lead and the lower internal coil lead are respectively connected with different branches, or the lower external coil lead and the lower internal coil lead are respectively connected with different circuit components and are then are connected in parallel with the same circuit. The split reactor is high in coupling degree, the voltage is reduced during normal running, the reactance is large when a fault occurs, and an effect of effectively limiting a short-circuit current is achieved.

An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil (1), a grounded heating roller (2) magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor (3) is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source (4) biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

The invention relates to a power control circuit board. Power control devices such as an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor) and the like of an upper bridge and a lower bridge of the power control circuit board are symmetrically arranged, so that the output terminals of the power control devices are connected in the neighborhood in the middle of the power control devices of the upper bridge and the lower bridge by using conductors; and the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge are connected in the neighborhood at the two sides of the power control devices of the upper bridge and the lower bridge, a filter capacitor is connected between the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge, and a power control unit is formed. A plurality of power control units are arranged in a shape like a Chinese character 'pin or lu', so that a power control stage is formed, a power positive line, a power ground line and a power output line are connected in the neighborhood, and reactance (distributed resistance and distributed inductance) of the conductors of the circuit board is reduced to the minimum. The performance and the efficiency of the power output stage are increased.

The invention discloses a novel deep and far sea wind power transmission system based on medium-low-power frequency collection. The novel deep and far sea wind power transmission system comprises a plurality of wind turbine generators, a plurality of confluence boosting transformers, a medium-frequency confluence bus, an offshore boosting frequency conversion station, a submarine cable, an onshore frequency conversion grid-connected station and an onshore power frequency power grid. According to the invention, the reactance of the power transmission line is reduced, the transmission capacity of the line is improved, and direct current equipment with high construction and maintenance cost is not included. In addition, a low-frequency or industrial-frequency transformer is replaced by the medium-frequency transformer with smaller volume and cost on the sea so that remarkable advantages are achieved. According to the invention, the optimal design of each link is realized, the main defects of the traditional scheme are solved in a targeted manner, and the system has a relatively high practical application value and a relatively good future development prospect.

The invention discloses a continuously controllable transformer. A continuously controllable transformer core comprises five pillars arranged in a cross shape, wherein the five pillars comprise a central pillar and four side pillars, are parallel to one another and form a magnetic flux loop by crossed beams; the central pillar is provided with AC coils L1 and L2; the side pillar I is provided with the AC coil L3 and a DC coil L5; the side pillar II is provided with the AC coil L4 and the DC coil L6; the side pillar III is provided with the DC coil L7; the side pillar IV is provided with the DC coil L8; the like end of the coil L5 is connected with that of the coil L6; the like end of the DC coil L7 is connected with that of the DC coil L8; an AC control power supply I is connected to the input end of a first full-bridge rectifier circuit by a pair of thyristors which are inversely connected in parallel; the AC control power supply II is connected to the input end of a second full-bridge rectifier circuit by another pair of thyristors which are inversely connected in parallel; and the output of the second full-bridge rectifier circuit is connected with terminals III and IV.

The present invention provides a superheated steam generating device and a method for manufacturing a conductor tube used in the device. By forming a short circuit in the conductor tube, the reactance can be reduced, and the possibility of damage to the junction part and the conductor tube can be reduced. The superheated steam generating device induction-heats the helically wound circular tubular conductor tube through a magnetic flux generating mechanism provided inside or outside the winding portion of the conductor tube, and heats the water flowing through the conductor tube. The steam generates superheated steam, and substantially the entire winding portion of the conductor tube, the opposing surfaces of the adjacent adjacent parts are joined by the joint part, and the thickness of the joint part is equal to or greater than the tube thickness of the conductor tube.

The invention discloses a super-conducting type controlled reactor with high leakage reactance. Three windings are wound on an iron core (1), a primary copper main coil (2), a secondary super-conducting control winding b (4) and a secondary super-conducting control winding a (3) are sequentially arranged from outside to inside, and the primary copper main coil (2), the secondary super-conducting control winding a (3) and the secondary super-conducting control winding b (4) are independent of one another. The super-conducting type controlled reactor with the high leakage reactance has the advantages of low induced voltage, low winding consumed power and high linearity, a function of limiting secondary arc current can be realized, and the quantity of super-conducting windings in practical application can be configured according to volume regulation of the controlled reactor.

The invention discloses a current compensation device for reducing the radio frequency sheath of a heating antenna, which comprises a supporting box, the supporting box includes a grounding backplane and a window, the window includes an end bottom plate and side baffles, and the upper and lower ends of the grounding backplane are respectively provided with The end bottom plate and the left and right ends of the grounding back plate are respectively provided with side baffles, and the middle position of the two side baffles is provided with a polar partition. is a parallelogram of θ, the inclination angle θ and the included angle θ between the total magnetic field of the tokmak and the ring direction are the same. When high antenna power is fed in, the present invention eliminates the high-strength ring on the surface by insulating the bottom plate of the supporting box on the one hand. On the other hand, the partial insulation of the pole-toward partition to block the circular current flowing through the Faraday shield can effectively weaken the parallel current imaginary part that forms the radio-frequency sheath potential, so that the peak value of the radio-frequency sheath potential during antenna operation is greatly reduce.

A jump reactance current limiter is composed of a jump reactance, a degaussing circuit and a circuit for preventing the jump reactance from vibrating, wherein the jump reactance is composed of a main loop (1), a degaussing loop (2), a fixed core (3), a movable core (6) and a spring (5) between the two cores, and the main loop is connected with the power supply circuit in series to constitute a series loop; the degaussing circuit is composed of the degaussing loop, a degaussing switch (9), a stroke switch (10) and a stroke compression bar (11); the degaussing loop is wound on a bobbin bracket (8) having the same magnetic circuit core with the main magnetic circuit, and when the degaussing circuit is switched on, the netic potentials of the two loops is equal or reverse in the phase. When no short circuit is provided between the series loops, air gaps (12) are arranged between twp cores, and the jump reactance is the micro-impedance; which is provided with a short circuit, the two coresare closed, and the jump reactance is the high impedance. The invention is used as the initiative type protection key apparatus, which is widely used in the power system and the electric apparatus ofthe high level, the middle level and the low level.

The invention discloses a full-superconducting primary excitation linear generator for direct-drive type wave power generation. The full-superconducting primary excitation linear generator comprises a primary stator and a secondary mover, wherein the primary stator comprises multiple groups of stator units arranged in a straight line; each stator unit comprises a U-shaped core, primary armature windings and primary exciting windings; the U-shaped core comprises two primary cores; an opening of the U-shaped core faces the secondary mover; the primary armature windings are arranged in the primary cores; the primary exciting windings are arranged in the U-shaped core; the secondary mover is the core which does not contain a winding and has a cogging structure; and a corresponding cogging structure is arranged on each primary core. According to the full-superconducting primary excitation linear generator, an arc-shaped structure exciting winding sleeves the outside of each primary core; and a cooling system does not move, so that the complexity level is reduced. The magnetic field conversion rate and the terminal voltage can be increased by a multi-tooth structure secondary; the defect of a low low-speed voltage is compensated; and by unequally-spaced teeth, the voltage frequency and amplitude generated when the generator moves to the end part are increased by reducing the end-part tooth pitch.

The invention relates to a thyristor controlled short circuit current limiter. In the limiter, a reactive coil L1 and a direct current coil L2 form a saturation reactor; the reactive coil L1 is used as an alternating current passage; the direct current coil L2 is used as a direct current passage; the reactive coil L1 interacts with the direct current coil L2 through a closed loop iron core in the saturation reactor; one end of the reactive coil L1 is connected with an input end of a full bridge rectifier circuit, and the other end of the reactive coil L1 and the other input end of the full bridge rectifier circuit are connected with an external circuit; an output end of the rectifier circuit is connected in series with a forward diode D7 and the direct current coil L2 to form a closed loop; two thyristors D5 and D6 are reversely connected in parallel between two input ends of the full bridge rectifier circuit; the thyristors which are reversely connected in parallel are controlled by control modules of the thyristors respectively; each control module is provided with three terminals; and two of the three terminals are connected with the positive electrode and the negative electrode of the controlled thyristor D5 or D6, and the third terminal is connected with a touch end of the controlled thyristor D5 or D6.

The invention relates to a split reactor with two symmetric branches. A first branch of the split reactor is formed by sequentially connecting an upper external coil lead, an upper external coil, a first intermediate lead, a lower internal coil and a lower internal coil lead in series, a second branch of the split reactor is formed by sequentially connecting an upper internal coil lead, an upper internal coil, a second intermediate lead, a lower external coil and a lower external coil lead in series, and the first branch and the second branch of the split reactor are symmetric in structure; and when a circuit is connected, the upper external coil lead and the upper internal coil lead are connected, the lower external coil lead and the lower internal coil lead are respectively connected with different branches, or the lower external coil lead and the lower internal coil lead are respectively connected with different circuit components and are then are connected in parallel with the same circuit. The split reactor is high in coupling degree, the voltage is reduced during normal running, the reactance is large when a fault occurs, and an effect of effectively limiting a short-circuit current is achieved.

A semiconductor device having a semiconductor substrate and a first insulator overlying the semiconductor substrate. A spiral coil inductor overlies the first insulator and a second insulator overlies the spiral coil inductor. A patterned ferromagnetic film overlies the second insulator and a patterned magnetic-bias film overlies the patterned ferromagnetic film.

The invention relates to a power control circuit board. Power control devices such as an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor) and the like of an upper bridge and a lower bridge of the power control circuit board are symmetrically arranged, so that the output terminals of the power control devices are connected in the neighborhood in the middle of the power control devices of the upper bridge and the lower bridge by using conductors; and the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge are connected in the neighborhood at the two sides of the power control devices of the upper bridge and the lower bridge, a filter capacitor is connected between the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge, and a power control unit is formed. A plurality of power control units are arranged in a shape like a Chinese character 'pin or lu', so that a power control stage is formed, a power positive line, a power ground line and a power output line are connected in the neighborhood, and reactance (distributed resistance and distributed inductance) of the conductors of the circuit board is reduced to the minimum. The performance and the efficiency of the power output stage are increased.

A smelting short net, comprising a first main row, a second main row, a third main row and a first branch row, a second branch row correspondingly connected to the first main row, the second main row, and the third main row and the third branch row, the first branch row, the second branch row and the third branch row are all provided with electrode rods, the first main row, the second main row and the third main row are arranged in parallel with each other, and the second main row The row is located below the first main row and the third main row and the distance between the first main row, the second main row and the third main row is equal; the first branch row, the second branch row and the third branch row respectively pass through The electrode pushing device is connected with the electrode rod; the electrode pushing device includes a linear propulsion mechanism and an electrode rod fixing device arranged on the linear propulsion mechanism, the electrode rod fixing device is made of conductive material, and a There is insulation.

The invention discloses a left-handed-medium-based round moment ring composite pole antenna which comprises an upper dielectric substrate (1) and a lower layer dielectric substrate (2) jointed together. The left-handed-medium-based round moment ring composite pole antenna also comprises a composite pole antenna (4) and round moment resonant rings (3) which are symmetrically fixed on one side of the tail end of the composite pole antenna (4) according to a 2x3 array, wherein the composite pole antenna (4) is connected with each round moment resonant ring (3) through metal strips (5); and 6 round moment resonant rings (3) are arranged on the front side of the lower layer dielectric substrate (2), and the positions of the 6 round moment resonant rings (3) are completely opposite to those of the round moment resonant rings (3) on the front side of the upper layer dielectric substrate (1). According to the combination of the round moment resonant rings (3) and the composite pole antenna (4), the magnetic permeability can be increased, the electromagnetic wave resonance strength can be enhanced in a specific frequency range, the antenna gain is increased and the return loss is reduced.