369 results about "Impedance network" patented technology

A wireless power transmitter (WPT) including a first, second, third circuit and a transmit coil for wirelessly delivering power to a wireless power receiver (WPR) including a receiver coil, rectifier, impedance network, protection circuitry, control logic, modulator/demodulator and ADC is provided. A method that enables WPT and WPR to deliver the required power to the WPR's downstream load in planar, orthogonal and intermediate modes of WPR placement on WPT is provided. The WPR is integrated into the strap/frame or in the vital area of the device. To avoid a heated metal object safety issue, the WPT implements a metal object detect algorithm to detect metal objects and terminate transmission of power. To protect their circuitry from induced voltage spikes in excess of acceptable levels, the WPR includes a simple protection circuitry that naturally turns on and siphons out the excess power when the acceptable threshold levels are exceeded.

A dual mode wireless power receiver (DMWPR) selectively applying a received power to a load device and utilizing at least a part of the power to power-up, communicate, and charge a secondary wireless power receiver (SWPR) is provided. The DMWPR includes a first circuitry having an impedance network, a switch network, a filter capacitor, and one or more switches, and a second circuitry having a security engine, a control logic circuit, and a modulator/demodulator circuit. The first circuitry receives power in charging mode and transmits power in communication mode. The second circuitry configures the first circuitry to allow receipt and transmission of power, receives and interprets data from SWPR in the identified wireless power protocol, and based on the type of SWPR authenticates, decrypts, and encrypts data transfer between DMWPR and SWPR, and receives and executes on a request from SWPR to perform a function associated with transmitted power.

A diversity antenna for the meter and decimeter wave ranges installed on a conductively framed dielectric surface in the body of a motor vehicle and substantially assembled from rectangular part surfaces, for example in a roof cutout or trunk with a dielectric trunk lid. A substantially wire-shaped antenna conductor is installed parallel with the conductive frame and spaced from a part thereof of the dielectric surface less than one fourth of the width of the dielectric surface. The wire-shaped antenna conductor has an interruption site which define a pair of antenna connection terminals. A two-pole, electronically controllable impedance network is incorporated in series in at least one additional interruption site. The position of the interruption site with the pair of antenna connection terminals, and the position of the additional interruption site are selected so that the antenna signals available at the different settings of the controllable impedance network are adequately decoupled in terms of diversity.

An impedance source power converter includes a power source, a main converter circuit and an impedance network. The main converter circuit is coupled to a load and the impedance network couples the power source to the main converter circuit. The impedance network is configured such that the main converter circuit is adapted to perform both buck conversion and boost conversion.

A power conversion apparatus, comprising: a power conversion circuit comprising an AC source; a power conversion unit with DC terminals and AC terminals; a filter inductor unit including first and second terminals, the first terminals of the filter inductor unit being connected to the AC source, the second terminals of the filter inductor unit being connected to the AC terminals of the power conversion unit; a common mode noise suppression circuit comprising a capacitive impedance network including first and second terminals; an impedance balancing network including first and second terminals; the second terminals of the capacitive impedance network are connected to the first terminals of the impedance balancing network, the first terminals of the capacitive impedance network are connected to the first terminals of the filter inductor unit, and the second terminals of the impedance balancing network are connected to the DC terminals of the power conversion unit.

A device comprises a switch network having a plurality of switch cells connected in series, wherein each switch cell has a plurality of input voltages, and a plurality of switches, wherein each switch is coupled to an input voltage, and wherein the switch network is configured such that a different output voltage is produced in response to a different configuration, an output voltage with an output capacitance, and an impedance network coupled between the switch network and an output voltage port.

The invention discloses a subsynchronous oscillation analysis method and device based on an impedance network model, wherein the method comprises the following steps of obtaining an impedance model; building the impedance network model by an element interconnection method according to the impedance network; aggregating the impedance network model by network equivalence methods such as series-parallel connection combined with star triangular transformation to obtain aggregation impedance of the impedance network model; and analyzing the subsynchronous oscillation features of a system according to the aggregation impedance. The method provides a new method for subsynchronous oscillation modeling and stable analysis; and the stability and the oscillation features of the system can be simply and efficiently judged.

A circuit matches the load impedance of an electronic device. The circuit comprises an impedance network, a control circuit suitable for varying the impedance of said network and a sensor coupled with said network and said load and suitable for detecting the ratio between the incident and reflected standing waves in transferring power from the electronic device to the load; the sensor is suitable for providing two signals substantially proportional to the incident and reflected amplitude of the waves at the control circuit. The impedance network is a network of variable resistances and the control circuit is suitable for varying the value of the resistances to lower said ratio between the incident and reflected standing waves to a value that ensures the transfer of power from the electronic device to the load.

A method is provided for detection of a ground fault in a high resistance network in a voltage source power conversion circuit comprising a power converter that converts incoming AC power to DC power applied to a DC bus and an inverter that converts DC power from the DC bus to output AC power. The method includes detecting a midpoint-to-ground voltage between a low side of the DC bus and a ground potential and detecting the presence of a ground fault in a high resistance network based upon the detected midpoint-to-ground voltage.

A plug-in detection module includes an impedance network for producing a plug-in signal in response to a supply signal that varies when one of a plurality of plug-in receptors is coupled to a plug connector and when one of the plurality of plug-in receptors is decoupled. A reference signal generator generates a reference signal having a plurality of reference signal values. A comparator generates a detection signal when the plug-in signal compares favorably to the reference signal. A processing module detects which of the plurality of plug-in receptors have a plug connector coupled thereto.

A current monitoring device (CMD) with a set of electromagnetic field sensors located within one or more grounded housings positioned within the combined electromagnetic fields generated by one or more electric power lines. The CMD includes electronics, typically located within the grounded housings, defining impedance networks that combine the measurements received from the field sensors to create output signal indicative of electric current values for the phase conductors. The housings can be conveniently attached and to transmission line towers, distribution line poles, and high voltage power line supports in transmission and distribution substations. The CMD controls response equipment, such as a circuit interrupter that responds to current disturbances detected by the CMD. The CMD may also include communication for sending the current values to a remote controller, such as a central control station, that implements a wide range of response equipment.

A higher power wireless power transmitter (HPWPT) including a first, second and third circuit and a transmit coil for wirelessly powering a lower power wireless power receiver (LPWPR) is provided. The first circuit is a switch network. The second circuit is variable impedance network and/or a tuning network. The third circuit is a control logic circuit configured to change the input voltage source or topology of the first circuit, to change the impedance and/or tuning characteristics of the second circuit, to select the transmit coil, vary frequency or duty cycle of the PWM signal or any combination thereof. The change in the input voltage or topology of first circuit or change in impedance or tuning characteristics of second circuit or change in the transmit coil used or the applied constraints on the frequency and duty cycle of the PWM signal constrain the maximum power transmitted by the HPWPT to LPWPR.

The object of the present invention is to realize a low-invasive underground exploration apparatus, system, and method which are capable of specifying the kind, three-dimensional position, and amount of a substance present in the ground. The underground exploration apparatus, system, and method includes: measuring, at multiple points, a high frequency voltage that appears upon conduction of high frequency current through the ground to obtain measurement results at two or more frequency levels; employing an ground model using the finite element method, the boundary element method, an impedance network, or the like to estimate a substance in the ground by changing unknown quantities of the ground model such as local dielectric constant and electric conductivity so as to make an error between the actual measured value and the calculated value smaller; and displaying input information of the ground model and results of the estimation processing two-dimensionally or three-dimensionally.

The invention provides a transceiver structure which integrates TR-SW and is shared by transmitting and receiving matching networks based on an on-chip transformer. The transceiver is used in a wireless communication radio frequency front-end circuit. The transceiver structure is based on the on-chip transformer, and integrates circuit original parts which are difficultly integrated, such as the impedance matching networks of a transmitter and a receiver, TR_SWITCH and the like, on a chip, thus the chip integration is greatly improved, and the cost is reduced. According to the invention, the on-chip impedance networks of the receiver and the transmitter are shared; a switch is used to control the alternate conduction of the transmitter and the receiver; the number of the original parts of the impedance matching networks on the chip is reduced; and the chip area is reduced.

This application relates to amplifier circuitry for amplifying a signal from a MEMS transducer. A super source follower circuit (40) is provided which includes a feedback path from its output node (Nout) to a control bias node (BC) in order to provide a preamplifier signal gain that may be greater than unity. A first transistor (M1) is configured to have its gate node connected to an input node (NIN) for receiving the input signal (VIN) and its drain node connected to an input node (X) of an output stage (A). The source node of the first transistor is connected to the output node (NOUT). A current source (I2) is configured to deliver a current to the drain node of the first transistor (M1), wherein the current source (I2) is controlled by a bias control voltage (VBC) at the bias control node (BC). A feedback impedance network (Z1) comprising a first port connected to the output node (NOUT) and a second port connected to the bias control node (BC) is provided.

The invention discloses a method used for letting a large-scale wind generating set to ride through when a power network has low voltage failure, and the method belongs to the technical field of the electric power transmission. Aimed at solving the connecting problem of the wind power generation, the method has the technical proposal that a three-phase passive impedance network or a resistance network is connected between the wind generating set and the power network in series, and a three-phase AC switch composed of a power semiconductor device is connected with the passive impedance network or the resistance network in parallel; when the power network has the low voltage failure, the three-phase AC switch is switched off, thereby accessing into the passive impedance network or the resistance network; and when the voltage is recovered, the three-phase AC switch is switched on, thereby enabling the passive impedance network or the resistance network to have short circuit, and recovering the normal connection between the wind generating set and the power network. The invention not only can ensure the security of a doubly fed induction wind generating set when the power network has the low voltage failure, but also can uninterruptedly provide currents for the power network, thereby enabling a line protecting device to reliably work.

An adaptive USB port controller is disclosed. In an exemplary embodiment, a system comprises a source, a power adapter, a USB port controller, a USB plug and cable, and a device. In one example, the device includes a rechargeable battery. After connecting the device to the USB port controller via the USB plug and cable, a reconfigurable module within the USB port controller sets a power mode by: (1) configuring an impedance network to present impedance modes that indicate available power modes, (2) detecting voltages on one or more of the USB conductors in response to each impedance mode, and (3) comparing the detected voltages to reference voltage levels to set one of multiple power modes. The reconfigurable module then controls the power adapter to transfer power according to the determined power mode.

A method and system for self-regulating wireless power transmitted to a wireless power receiver (WPR) is provided. An auto-tuning network is operably coupled within the WPR. The auto-tuning network comprises an impedance network that dynamically increases, decreases, or maintains amount of the received wirelessly transmitted power by detecting changes in a rectifier load disposed in the WPR and/or in an output voltage of the rectifier in the WPR. The auto-tuning network self-regulates the wireless power received from a wireless power transmitter (WPT) obviating the need for conventional communication messages. The WPT is hence free from a modulator/demodulator block and an out-of-band communication block and can operate over a limited operating range to enable simpler design for passing EMC regulation. Additionally, the WPR implements a receiver-maximum power-signature algorithm for enabling the WPT to detect unsupported receivers, configure its operating point and range, and terminate power transmission when not needed by WPR.

The invention relates to a reconfigurable radio frequency and microwave power amplifier. The reconfigurable radio frequency and microwave power amplifier comprises an input radio frequency switch, anadjustable input matching network, a power amplifier stage, an adjustable output matching network and an output radio frequency switch which are connected in turn, and an adjustable harmonic impedancecontrol network and a bias and control circuit; and the adjustable input matching network and the adjustable output matching network respectively comprise at least one LC network with a fundamental wave impedance conversion function, wherein the LC network comprises at least one reconfigurable device, and the reconfigurable device is connected with a passive device in the LC network in parallel.According to the reconfigurable radio frequency and microwave power amplifier provided by the invention, the reconfigurable harmonic impedance control network and the fundamental wave impedance matching network are realized through the adjustable input matching network, the adjustable harmonic impedance control network and the adjustable output matching network; and when a power amplifier works indifferent bands of a linear power amplifier mode, a load impedance network can be reconfigured in real time, which satisfies the fundamental wave impedance and harmonic load required by each frequency band.

A hybrid binary/thermometer code is employed to adjust the output impedance of a variable impedance output driver circuit having an impedance network comprising a plurality of impedance legs each programmably electrically connectable according to the hybrid binary/thermometer code in parallel between a voltage source and the signal pad. The plurality of impedance legs are partitioned into one or more set pairs of binary stepped impedance legs and corresponding thermometer stepped impedance legs. A binary set of calibration signals in the hybrid binary/thermometer code steps a given set of binary stepped impedance legs according to a binary code and a thermometer set of calibration signals in the hybrid binary/thermometer code steps the corresponding set of thermometer stepped impedance legs according to a thermometer code once per full count iteration of the binary set of calibration signals.

Disclosed is a comprehensive evaluation analysis method for power transformer short-circuiting resistance. The method includes the following steps that 1, short-circuit currents when various external short circuits happen to a power transformer can be calculated according to relevant parameters of the power transformer and an impedance network analysis method, and the short circuits include symmetrical short circuits and asymmetrical short circuits; 2, calculated values of the short-circuit currents are compared with the maximum short-circuit current value which is allowed by the power transformer to obtain a transformer short-circuiting resistance evaluating result A based on the short-circuit currents; etc. By means of the comprehensive evaluation analysis method for the power transformer short-circuiting resistance, problems which happen to mechanical test methods based on short-circuiting electrodynamic force which is obtained through an empirical formula in terms of traditional evaluation of power transformer short-circuiting resistance can be solved, traditional methods are combined with an electromagnetism method based on the short-circuit currents on the original basis, and the evaluation method is quite reasonable and effective.