58results about How to "Eliminate impedance" patented technology

An antenna matching apparatus capable of eliminating impedance mismatching produced when the antenna element is placed close to the human body in a short time and reducing power loss due to impedance mismatching. This apparatus connects variable capacitance capacitors VC1 and VC2 for impedance adjustment to transmission antenna element TA1, connects variable capacitance capacitors VC3 and VC4 to reception antenna element RA1 respectively, provides beforehand capacitance values of respective variable capacitance capacitors which are impedance matched in a table in a one-to-one correspondence with the distances between the antenna elements and human body and stores the table in storage section (106). The apparatus completes adaptive control processing for any one of transmission antenna element TA1 and reception antenna element RA1, reads other capacitance values corresponding to the capacitance value at that moment from the table and performs adaptive control processing on other antenna elements using the read values as initial values.

The present invention is directed to a circuit assembly that includes an integrated circulator assembly. The circuit assembly has a first substrate, which contains a continuous circuit trace that includes a circulator component from the circulator assembly and at least one electrical component from the circuit assembly. A second substrate is disposed beneath the first substrate and includes a cladding on one surface. The second substrate contains an aperture that accepts a ferrite element, which is axially aligned with the circulator component of the circuit trace. A conductive material is placed across the ferrite element so that it forms a continuous ground plane with the cladding, which is common to the entire circuit trace. The circulator assembly also contains a magnet bonded to the ferrite element. The circulator assembly may also include a yoke disposed below the magnet to shield the circulator from external magnetic fields.

A differential reflection bridge is provided for a 100 Ohm load, the bridge not being compromised by a translation to a 50 Ohm system. The reflection bridge uses two transmission line baluns. The first traditional balun T1 connects the input signal source to a resistor bridge. The second balun T2 connects between a central node of the resistor bridge and an output OUT as well as a second test port that eliminates a path to ground. With no ground path the bridge is immune to common mode impedance disturbances.

A socket terminal includes front and rear terminals. The front terminal includes a front contact-point portion that wipes off foreign material adhered to a terminal surface of a plug terminal. The rear terminal includes a rear contact-point portion that contacts the terminal surface wiped by the front contact-point portion. The socket terminal also includes a movable portion between a circuit-board connection portion and circuit board. The movable portion cancels a reduction in impedance of at least the front terminal and rear terminal for a transmission signal flowing from the circuit-board connection portion connected to the circuit board. This can provide a socket terminal allowing the rear contact-point portion to contact the terminal surface from which foreign material has been wiped off, and allowing impedance mismatching at a terminal transmission path to be eliminated; and to provide an electric connector including the socket terminal.

The embodiment of the invention discloses a charging method and a charging device, which relate to the technical field of communication, so as to solve the problem of long charging time of a battery.The charging method comprises: after charging the battery according to a first current value, charging the battery according to a second current value, the second current value being smaller than thefirst current value, and N being a positive integer in each of N charging cycles; Charging the battery according to the target cutoff voltage value when the target voltage value is greater than or equal to the target cutoff voltage value at the end of each charging cycle; Wherein the target voltage value is a charging voltage value corresponding to the first current value, and the target cutoff voltage value is a first cutoff voltage value, or the target voltage value is a charging voltage value corresponding to the second current value, and the target cutoff voltage value is a second cutoff voltage value, and the second cutoff voltage value is smaller than the first cutoff voltage value. The method can be applied to the scenario of charging the battery.

A miniaturized semiconductor device has a package substrate, a semiconductor chip mounted on the main surface of the package substrate and having plural LNAs each for amplifying a signal, an RF VCO for converting the frequency of the signal supplied from LNA, and an IF VCO for converting the frequency of a signal supplied from a baseband. A plurality of ball electrodes are provided on the back surface of the package substrate. The package substrate is provided with a first common GND wire for supplying a GND potential to each of the LNAs, with a second common GND wire for supplying the GND potential to the RF VCO, and with a third common GND wire for supplying the GND potential to the IF VCO. The first, second, and third common GND wires are separated from each other.

A system and method for automatically selecting a translator to translate a component request using semantic typing is presented. A mediator receives a component request from a first component that requests to invoke a second component. The mediator retrieves a launch target identifier and a requester provided property type identifier from the component request. The requester provided property type identifier includes semantic typing corresponding to a data value. The mediator retrieves a recipient input property type identifier corresponding to the launch target identifier, and uses the requester provided property type identifier and the recipient input property type identifier to select a translator. The mediator passes a data value included in the component request to the selected translator, and receives a translated data value from the translator. The mediator constructs a property using the translated data value and includes the constructed property in a call that is sent to the second component.

The invention provides a resonance grounding power distribution network ground parameter measurement method considering damping resistance, and the method is suitable for a neutral point arc suppression coil cascading damping resistor grounding power distribution network. The method comprises: injecting a non-power-frequency characteristic frequency constant-current signal into a power distribution network through a voltage transformer in an arc suppression coil; measuring the returned characteristic frequency voltage signal from the neutral point zero-sequence voltage transformer of the powerdistribution network, changing the frequency of the current signal, searching the resonance angular frequency of the zero-sequence equivalent circuit of the power distribution network, and calculating the ground capacitance and the ground leakage conductance of the power distribution network. The influence of impedance and damping resistance in the voltage transformer can be eliminated, high-precision measurement of ground parameters of the resonance grounding power distribution network is achieved, accurate tuning of the arc suppression coil is facilitated, measurement is safe and rapid, andnormal operation of the power distribution network is not affected.

An apertured fixed chip resistor and method for fabricating the same are disclosed according to the present invention, wherein a bonding layer is applied to accordingly bond together a substrate and a metallic sheet structure that has central aperture, and then a passivation layer is applied to partially cover the exposed surface of the metallic sheet structure and to divide the surface of the metallic sheet structure into a central covered region separating two uncovered regions, wherein the uncovered regions are provided to serve as electrode zones, thereby eliminating unnecessary current transmission impedance as in prior art as well as efficiently and stably reducing the temperature coefficient of resistance. The bonding design of the substrate and the metallic sheet structure of the present invention is capable of overcoming the drawback of the high cost of semiconductor processing as applied in prior art, and it provides a simple fabrication process that is capable of increasing process yield and decreasing total production costs.

The present invention relates to a frequency-variable driven washing machine, which is characterized by that in said washing machine the electric network power supply is converted into variable frequency and two-phase power source whose time lag is equal to 1/4 cycle to drive two-phase symmetrical winding motor of space phase difference Pi/2 electric angle. Its one technical scheme is as follows: electric network power source is converted into variable frequency power source by means of rectifying-filtering circuit and inversion circuit, its rectifying-filtering circuit is formed from positive half-wave rectification filtering circuit and negative half-wave rectification filtering circuit and has a common end with power supply circuit of electric network, and its inversion icrcuit is double half wave 4 unit, and its uses existent washing machine motor. It possesses the excellent performance of symmetrical motor, and its structure is simplified and cost is reduced.

A device is described, which provides electrical stimulation to the brain of a person, where the device comprises one or more modules, each module comprising an implantable pulse generator (IPG) and a lead with at least one subcranial electrode, which extends into or near the surface of the brain. Each module's IPG comprises a battery and a subcutaneous electrode. Each module is inserted into a burr hole, and a seal fills the space to minimize electric current flow between the subcutaneous electrode and subcranial electrode.

A multi-feed antenna is described where the antenna is optimized for the natural impedance state per frequency band. Multiple feed points are accessed as a function of frequency and use case to provide a feed port that is operating at the natural impedance state for the antenna structure. Impedance transforming circuits can be applied to the feed point to form impedance matching circuits to transform the antenna impedance to a characteristic impedance of the system or circuit interfacing with the antenna. The impedance transforming circuits can be eliminated and the RF circuitry interfacing with the antenna can be configured to operate at the natural frequency of the antenna.

The invention discloses a method and system for measuring ground insulation parameters of a neutral point ungrounded power distribution network by adopting a star-shaped capacitor. The method comprises the following steps: injecting a specific frequency current signal into a neutral point of the star-shaped capacitor of a neutral point ungrounded power distribution network; measuring the returnedfrequency voltage signal by a no-load zero-sequence voltage transformer on the open triangle side; and calculating ground insulation parameters, namely ground capacitance and ground leakage conductance, of the neutral point ungrounded power distribution network according to the voltage signal and the current signal. According to the invention, online measurement of ground insulation parameters canbe realized, primary side wiring of the power distribution network does not need to be changed during measurement, normal operation of the power distribution network is not influenced, the influenceof impedance in the voltage transformer and harmonic elimination resistance of the power distribution network can be eliminated, and the method has the characteristics of safe, simple and convenient measurement, economy and high precision.

The invention discloses a detachable three-electrode battery testing device and an assembling method thereof. The device comprises a shell, a lead screw, an extrusion assembly and a reference electrode assembly, wherein the shell comprises a base, a first sealing ring and an upper cover; a positioning groove is formed in the cavity bottom of the base; the upper cover is detachably connected to the top end of the base; the first sealing ring is arranged between the upper cover and the base; the lead screw penetrates through the upper cover and the first sealing ring to be in threaded connection with the base. The device can test and research the impedance and the change condition of the electrode plate, can research and analyze the dynamic mechanism in the chemical process of the electrode, can judge and analyze the battery capacity recession reason, is high in sealing performance, avoids air leakage and liquid leakage, can realize thousands of cycles of a power or energy storage battery, improves labor efficiency, the device is simple in structure, reasonable in arrangement, low in cost and high in practicability, and the assembling method is safe, few in step and easy to operate.