3485 results about "Voltage amplitude" patented technology

There is provided a semiconductor device in which fabrication steps can be reduced by constructing a circuit using only TFTs of one conductivity type and in which a voltage amplitude of an output signal can be normally obtained. A capacitance (205) is provided between a gate and a source of a TFT (203) connected to an output node, and a circuit formed of TFTs (201) and (202) has a function to bring a node a into a floating state. When the node α is in the floating state, a potential of the node a is caused higher than VDD by using gate-source capacitance coupling of the TFT (203) through the capacitance (205), thus an output signal having an amplitude of VDD-GND can be normally obtained without causing amplitude attenuation due to the threshold value of the TFT.

A variable feedback impedance is presented capable of providing high linearity (e.g. as represented by 1P2 and 1P3) and high linear range (e.g. as represented by P1dB) when used in a feedback path of an RF amplifier in the presence of high voltage amplitudes.

A pixel having a structure in which low voltage drive is possible is provided by a simple process. A digital image signal input from a source signal line is input to the pixel through a switching TFT. At this point, a voltage compensation circuit amplifies the voltage amplitude of the digital image signal or transforms the amplitude, and applies the result to a gate electrode of a driver TFT. On-off control of TFTs within the pixel can thus be performed normally even if the voltage of a power source for driving gate signal lines becomes lower.

There are many inventions described herein as well as many aspects and embodiments of those inventions, for example, circuitry and techniques for reading, writing and/or operating a semiconductor memory cells of a memory cell array, including electrically floating body transistors in which an electrical charge is stored in the body of the transistor. In one aspect, the present inventions are directed to one or more independently controllable parameters of a memory operation (for example, restore, write, refresh), to program or write a data state into a memory cell. In one embodiment, the parameter is the amount of time of programming or writing a predetermined data state into a memory cell. In another embodiment, the controllable parameter is the amplitude of the voltage of the control signals applied to the gate, drain region and/or source region during programming or writing a predetermined data state into a memory cell. Indeed, the controllable parameters may be both temporal and voltage amplitude. Notably, the memory cell array may comprise a portion of an integrated circuit device, for example, logic device (for example, a microprocessor) or a portion of a memory device (for example, a discrete memory).

In one embodiment, the present invention includes a test signal generator capable of producing an impedance test signal comprising of a sine wave having a known frequency. The test signal generator may include a crystal oscillator, a counter, and a lookup table. The lookup table output is applied to a digital to analog converter and is then low pass filtered using a conventional analog filter to produce a sine wave of a known frequency and voltage amplitude. The test signal flows through the electrode and combines with an electrophysiological signal to form a combined signal. A signal processor is used to isolate the combined signal into the test signal component and the electrophysiological component. The signal processor digitally low pass filters the combined signal and the output of the low pass filter is the electrophysiological signal. The signal processor then digitally bandpass filters the combined signal using a filter with a center frequency which is the same as the test frequency. The output of this filter is then used to calculate the electrode impedance.

A clamping current and voltage sensor provides an isolated and convenient technique for measuring current passing through a conductor such as an AC branch circuit wire, as well as providing an indication of an electrostatic potential on the wire, which can be used to indicate the phase of the voltage on the wire, and optionally a magnitude of the voltage. The device includes a body formed from two handle portions that contain the current and voltage sensors within an aperture at the distal end, which may be a ferrite cylinder with a hall effect sensor disposed in a gap along the circumference to measure current, or alternatively a winding provided through the cylinder along its axis and a capacitive plate or wire disposed adjacent to, or within, the ferrite cylinder to provide the indication of the voltage. When the handles are compressed the aperture is opened to permit insertion of a wire for measurement.

A ground fault detector and detection method for a vehicle that can determine the cause of the occurrence of a ground fault after detecting the presence of the ground fault. The output terminal of a high-voltage battery is connected to one side of a coupling capacitor. In operation, a pulse signal is applied to a measurement point on the other side of the coupling capacitor, and the voltage generated at that point is detected. Whether the high-voltage battery or the electrical equipment units are grounded is determined. To determine the cause of the ground fault, the oscillation frequency of the square-wave pulse signal is changed and applied to the measurement point. From the change in voltage amplitude detected, it is determined whether the cause of the ground fault is a resistive or a capacitive ground fault, according to the change in the impedance of the battery or the units.

A touch panel device according to the present invention includes: a stylus pen including a conductive stylus pen electrode portion at a tip portion thereof; a plurality of capacitance detecting interconnections formed on a substrate in row and column directions; an oscillator circuit which outputs an oscillation signal for performing charging/discharging to each of the plurality of capacitance detecting interconnections, the oscillation signal having a cycle which changes in accordance with an amount of electric charges in the charging/discharging; and a counter circuit and a computing circuit/control circuit which compute, based on a change of the cycle being in accordance with a capacitance formed between the electrode portion of the stylus pen and the capacitance detecting interconnections, positional coordinates of the stylus pen brought in proximity to the capacitance detecting interconnections in a non-contact manner, wherein the stylus pen outputs to the electrode portion of the stylus pen an input pen signal which is in synchronization with the oscillation signal, has a phase different from a phase of the oscillation signal, and has a larger voltage amplitude compared with the oscillation signal.

Methods are disclosed employing seismic waves having infrasonic frequencies in the range of about 0.1–20 Hz for generating electromagnetic waves of similar infrasonic frequency in hydrocarbon bearing subterranean formations located at depths up to about 5000 meters, said electromagnetic waves having sufficient voltage amplitudes for detection at the earth's surface. Also disclosed are seismic sources capable of generating infrasonic seismic waves of sufficient amplitude for generating electromagnetic waves in hydrocarbon bearing formations at depths up to 5000 meters, said electromagnetic waves having voltage amplitudes sufficient for detection at the earth's surface.

A system for controlling a grid connected power generating system is provided. The system includes a wind turbine, a converter, a first controller and a second controller. The wind turbine supplies electrical power to a power grid and the converter couples the wind turbine to the power grid. The first controller calculates voltage commands to emulate a phasor back electromotive force behind an inductance. The controller further generates converter switching commands from the voltage commands. The voltage commands include a voltage magnitude reference and an internal frequency reference calculated from a power imbalance between an active power reference and the electrical power. The second controller is used to limit a converter current.

A Schmitt trigger has a first inverter, a second inverter, a bias means, and a transistor. The inverter has an input and an output. The second inverter has an input coupled to the output of the first inverter and has an output. The bias means provides a first bias voltage on a first output terminal. A magnitude of the bias voltage is selectable by a first input signal. The transistor has a first current electrode coupled to a first power supply terminal, a control electrode coupled to the output of the second inverter, a second current electrode coupled to the output of the first inverter, and a body coupled to the first output terminal. Selectability of the magnitude of the bias voltage provides selectability of the hysteresis of the Schmitt trigger.

To maintain consistency in different environments with different impedances, a high voltage current driver may be used as a signal generator to output a tactile signal with a constant current. The constant current ensures that the voltage between the user's finger and the object's surface or electrode remains the same even if impedances in the electrical path change. Specifically, the current driver includes a current sensing circuit that determines the average current being generated. Using a feedback loop, the measured current is compared to a reference current to determine if the correct tactile sensation is perceived by the user. As the impedance changes, the current driver detects the resulting change in the signal's current and adjusts the voltage amplitude of the generated tactile signal in order to match the measured current to the reference current.

A control system for an electric machine includes a flux weakening module, which includes a voltage magnitude calculator that receives d-axis and q-axis command voltages and that generates a voltage magnitude. An error circuit compares the voltage magnitude to a reference voltage and generates an error signal. A controller receives the error signal and generates a feedback flux correction signal. A limiter limits the feedback flux correction signal to a predetermined flux value and generates a limited feedback flux correction signal. A feedforward stator flux generating circuit generates a feedforward stator flux signal. A summing circuit sums the feedforward stator flux signal and the limited feedback flux correction signal to generate a final stator flux command.

An object of the present invention is to provide a mass-storage nonvolatile memory device capable of performing high speed operation. The nonvolatile memory device comprises a memory array comprising a plurality of memory cells arranged in a matrix, each of the memory cells comprising a variable resistor element formed of a manganese-containing oxide having a perovskite structure in which an electric resistance is varied by application of a voltage pulse and a variation amount of the electric resistance is variable depending on the magnitude of the voltage amplitude; and a program pulse generation circuit that, in order to program 3-level or larger multi-level data corresponding to one erase state and two or more program states into the variable resistor element, is capable of performing generation of program pulses having two or more different voltage amplitudes corresponding to the program states, the generation being separately performed corresponding to program data.

A voltage positioning technique allows a power supply controller to more fully exploit active voltage positioning as a way of maintaining supply voltage within the limits defined for an associated electrical load. The supply voltage is allowed to "droop" as a function of load current. Droop may be implemented in linear proportion to load current, or as a discrete droop function once load current exceeds a given threshold. In either case, the droop circuitry of the supply controller implements a bounding function that establishes an accurately known maximum droop voltage magnitude. This maximum droop voltage limit establishes a reliable lower limit for the supply voltage independent of increasing load current. This accurately set lower bound for the droop voltage enables the controller to more aggressively position the supply voltage at the lower voltage limit of the load, which minimizes voltage overshoot and load power consumption.

An adapter device includes a DC/DC adapter to receive DC power from a DC power source, and output a regulated DC voltage (V_out). A source determination circuitry receives the DC power from the DC power source and compares a magnitude of a voltage of the DC power with a reference magnitude of a reference voltage (V_ref). When the magnitude of the voltage of the DC power is greater than the reference magnitude, a data signal (V_data) having a first value is output. When the magnitude of the voltage of the DC power is less than the reference magnitude, the V_data signal having a second value is output. The V_data signal is received by control circuitry of an electronic device. When the V_data signal has the first value, the electronic device operates in a first mode where battery charging circuitry is disabled. When the V_data signal has the second value, the battery charging circuitry is enabled.

The invention discloses a fault positioning method for a power distribution network by combining simulation calculation and real-time monitoring, and belongs to the technical field of fault detection of the power distribution network. The method comprises the following steps of: extracting information of a target power distribution network from the conventional power distribution network geographic information system and a power distribution network energy management system through an organizational data analysis interface to automatically generate a real-time simulation calculation model of the target network; putting forward a virtual node-based fault positioning algorithm according to the simulation calculation model so as to solve functional relation between voltage amplitude of any node and a fault position parameter when a symmetric and asymmetric fault occurs at any point in the target network; and finally calculating an accurate position of the actual fault of the power distribution network by using a small amount of real-time data of voltage drop amplitude in a fault process. By using the fault positioning method for the power distribution network by combining the simulation calculation and the real-time monitoring, the state and the parameter of the network are accurately and effectively reflected when the fault occurs, the accuracy of the fault positioning is improved, and the method is suitable for various network structures and fault types.

The invention relates to the technical field of operation and control of an electric power system and discloses a method for detecting and identifying dynamic bad data of the electric power system. The method comprises the steps of A, reading a current network parameter and a network topology of the electric power system and forming a node admittance matrix and a branch circuit-node incidence matrix; B, establishing an equivalent circuit according to the network topology of the electric power system and configuring measurement functions and a power management unit (PMU) of the electric power system, wherein system measurement includes node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node trend measurement; C, detecting and identifying the dynamic bad data of the electric power system; D, judging the convergence condition. By means of the method, accidentally arisen bad data from a supervisory control and data acquisition (SCADA) system and in the PMU measurement can be found and eliminated, and accordingly an accurate operation state, voltage amplitude and phase angles of nodes of a power grid are obtained.

A monolithic integrated circuit (IC), and method of manufacturing same, that includes all RF front end or transceiver elements for a portable communication device, including a power amplifier (PA), a matching, coupling and filtering network, and an antenna switch to couple the conditioned PA signal to an antenna. An output signal sensor senses at least a voltage amplitude of the signal switched by the antenna switch, and signals a PA control circuit to limit PA output power in response to excessive values of sensed output. Preferred fabrication techniques include stacking multiple FETs to form switching devices. An iClass PA architecture is described that dissipatively terminates unwanted harmonics of the PA output signal. A preferred embodiment of the RF transceiver IC includes two distinct PA circuits, two distinct receive signal amplifier circuits, and a four-way antenna switch to selectably couple a single antenna connection to any one of the four circuits.

The invention provides a field weakening control method for a built-in permanent magnet synchronous motor. The method comprises the following steps: motor speed closed-loop control in a field non-weakening region: the output of a speed loop is the current directive value i<*>q of an axis q, the current directive value i<*>d of an axis d is calculated from i<*>q according to an MTPA relation, and i<*>d, i<*>q and the actual feedback values id and iq thereof are subjected to closed-loop control to output the voltage directive values of the axis d and the axis q; difference value amplitude-limiting processing: whether to enter a field weakening region is judged, if yes, an output voltage amplitude value controls a PI (Proportional-Integral) controller to work and controls a PI adjustor to perform difference value amplitude-limiting processing and output Deltaiq, otherwise, the output voltage amplitude value controls the PI controller not to work, and the output is 0; in case of entering the field weakening region, the output i<*>q of the speed loop is only used as the current directive value of the axis d after MTPA calculation, and the sum of the output of the front beat of the speed loop before entering the field weakening region and Deltaiq serves as the current directive value of the axis q in the field weakening region.