31results about How to "Distributed capacitance increases" patented technology

The position of an object, which may be a user's finger, along a body is sensed capacitively. A measurement circuit meters the simultaneous injection of electrical charge into the two ends of the body, which may be shaped as a straight line or as a curve. A computing device computes the ratio of the relative changes in the amount of charge injected into each end of the element. The result of this computation is a one dimensional coordinate number plus a detection state indication, both of which can be fed to another functional element, such as an appliance controller, which interprets the coordinate and detection state as a command or measurement.

The position of an object, which may be a user's finger, along a body is sensed capacitively. A measurement circuit meters the simultaneous injection of electrical charge into the two ends of the body, which may be shaped as a straight line or as a curve. A computing device computes the ratio of the relative changes in the amount of charge injected into each end of the element. The result of this computation is a one dimensional coordinate number plus a detection state indication, both of which can be fed to another functional element, such as an appliance controller, which interprets the coordinate and detection state as a command or measurement.

The invention discloses a radome based on a wide-stop-band low-frequency multi-layer frequency selective surface. The upper surface of the upper PCB board is provided with an upper conductive layer, the lower surface of the upper PCB board is provided with a middle conductive layer, and the lower surface of the lower PCB board A lower conductive layer is provided, the upper conductive layer is composed of several upper interdigital structural units periodically arranged, the middle conductive layer is composed of several cross-shaped structural units periodically arranged, and the lower conductive layer is composed of several lower interdigital structural units periodically arranged. Composed of interdigital structural units, wherein an upper interdigital structural unit corresponds to a cross-shaped structural unit and a lower interdigital structural unit; the upper interdigital structural unit and the lower interdigital structural unit are composed of two comb structures, Among them, the lengths of the outermost teeth of the two comb structures are the same, relatively distributed, and there is a gap between them; each upper interdigital structural unit is completely aligned with the corresponding cross-shaped structural unit and lower interdigital structural unit; the radome has lower resonant frequency.

The invention provides an SD card (secure digital memory card). The SD card comprises a controller, an intelligent card chip, a memory and a metamaterial radio frequency antenna; the intelligent card chip and the memory are connected with the controller; the metamaterial radio frequency antenna is connected with the intelligent card chip; the metamaterial radio frequency antenna comprises a first medium substrate, a feeder line, a metal sheet attached on one surface of the first medium substrate and a second medium substrate for covering the metal sheet; the feeder line is fed in the metal sheet in a coupled manner; and a micro-slot structure is curved on the metal sheet. According to the SD card, the metamaterial radio frequency antenna which can be small-sized easily is adopted by the SD card, so that the mobile payment function and other functions can be realized without being limited by operators; and the cost of the SD card can be saved, and the large-scale application of the SD card can be realized.

The invention provides an electromagnetic voltage transformer with an insulation function through capacitive impedance epoxy resin casting. The electromagnetic voltage transformer is characterized in that layer insulations with high dielectric constants are adopted, epoxy resin mixtures with high dielectric constants are adopted, the area of a high-low voltage electrostatic screen is increased, the distributed capacitance of the high-low voltage electrostatic screen can be 300-500 pF, and the transformer is still capacitive with perceptual load. The electromagnetic voltage transformer comprises an iron core, a wire wrapping framework, a secondary winding, an inner electrostatic screen, the layer insulation, an outer electrostatic screen and a primary winding. The wire wrapping framework is arranged in the middle of an iron core window, the secondary winding and the primary winding are sequentially wound on the wire wrapping framework from inside to outside, the inner electrostatic screen is arranged on the inner side of the primary winding, the outer electrostatic screen is arranged on the outer side of the primary winding, the layer insulation is arranged between layers of the primary winding, and the iron core, the wire wrapping framework, the secondary winding, the inner electrostatic screen, the layer insulation, the outer electrostatic screen and the primary winding all are arranged in an epoxy resin mixed-casting material layer. The electromagnetic voltage transformer can normally operate under 2.5 times the rated voltage, core saturation is basically avoided, and a ferromagnetic resonance area is avoided.

The invention relates to a direct-current bus connection structure of a three-phase high-power inverter. In order to solve the problems that the grouping installation of capacitors is not considered in the prior three-phase high-power inverter and the ripple current between the capacitors is reduced, the invention provides a direct-current bus connection structure of the three-phase high-power inverter, which comprises a direct-current power supply, at least two capacitor modules and an inverted switching tube module, wherein the capacitor modules are connected with the inverted switching tube module in parallel, lapped copper bars with vertical laminated structures are arranged between the two adjacent capacitor modules and connected in parallel, and the capacitor modules are connected with the direct-current power supply after being connected with the inverted switching tube module in parallel. By adopting the connection, all the capacitor modules can bear the energy requirement of the entire output power together, and the utilization ratio of the capacitance is improved; the vertical laminated structures of the anode and the cathode copper bars of the capacitor modules, the line impedance and the stray inductance parameter are minimized so as to reduce the ripple current between the capacitor modules; and the capacitor modules adopt the independent structural design, thereby facilitating distributed installation and maintenance.

A frequency selective surface structure of large bandwidth and small size periodic unit, which comprises a first base material and a second base material, the front surface of the first base material is provided with an upper conductive layer, and the first base material and the second base material are provided with The middle conductive layer, the reverse side of the second base material is provided with a lower conductive layer, the upper conductive layer, the middle conductive layer and the lower conductive layer are respectively composed of the upper periodic unit, the middle periodic unit and the lower periodic unit. The broken line on the side and the upper first conductive metal sheet and the upper second conductive metal sheet on the right side are composed of the middle period unit is composed of the middle conductive metal sheet, and the lower period unit is composed of a series of parallel conductive metal wires in the lower layer. Identical and stacked on top of each other, edge-aligned. The frequency selective surface of the present invention uses the surface-to-surface coupling between the conductive metal sheets to increase the distributed capacitance and reduce the relative size; the broken line increases the distributed inductance and increases the relative passband bandwidth; the lower parallel conductive metal lines increase the frequency selective surface crossing Polarization isolation.

The invention relates to a non-unit self-adjoint impedance protection method applicable to a half-wavelength power transmission line. The method comprises the following steps of acquiring a three-phase current and a three-phase voltage of a relay protection device installation side of the half-wavelength power transmission line; judging whether starting quantity of the half-wavelength power transmission line conforms to a starting condition or not; determining variable quantity impedance of the half-wavelength power transmission line; combining steady-state quantity impedance and variable quantity impedance of the half-wavelength power transmission line into self-adjoint impedance of the half-wavelength power transmission line; and opening relay protection action of the half-wavelength power transmission line according to the self-adjoint impedance of the half-wavelength power transmission line. According to the method provided by the invention, relay protection action is very rapidly and reliably carried out when a fault occurs in a circuit by means of non-unit electrical quantity of the half-wavelength power transmission line, false action of the fault outside a circuit region can be prevented, and the reliability and the sensitivity of relay protection of the half-wavelength power transmission line are improved.

The invention relates to an implanted electrode compatible with MRI. The implanted electrode comprises a flexible insulated conduit, at least one contact, at least one connector and a spiral wire, wherein the flexible insulated conduit is provided with a first end and a second end opposite to the first end, the contacts are arranged on the outer surface of the first end of the flexible insulated conduit, the connectors are arranged on the outer surface of the second end of the flexible insulated conduit, the spiral wire is located in a cavity of the insulated conduit, or located in the wall of the insulated conduit or wound outside the conduit, and the contacts and the connectors are electrically connected through the spiral wire. The spiral diameter of at least one part of the spiral wire is larger than that of the other part of the spiral wire, so that the spiral wire is of a variable spiral diameter structure. The structure can change the electrical parameter performance, under an RF magnetic field of MRI, of the wire, and therefore the heating risk, caused by the RF magnetic field, on the contacts is reduced. The invention further relates to a manufacturing method for the implanted electrode compatible with MRI.