44results about How to "Small reactance" patented technology

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 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 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.