118 results about "Inductive Resistance" patented technology

An apparatus and method for displaying battery capacity and a charge / discharge state of a portable device are provided. The apparatus includes a charge Integrated Circuit (IC) for providing current to recharge the battery using an external charge power source, a sensing resistance interposed between the battery and the charge IC, a switch connected to the sensing resistance in parallel and opened to flow the current to the sensing resistance when a capacity of the battery is measured, and a controller for determining the capacity of the battery using voltage values at both ends of the sensing resistance measured when the switch is opened.

What is described here is a power supply unit for plasma systems such as plasma processing or coating devices, wherein electric arcs or disruptive breakdown may occur, which originate from an electrode in particular, comprisinga d.c. voltage or direct-current source whose output terminals are connected via an inductive resistor and a power switch to the electrodes of the plasma system, and possiblya circuit for detecting electric arcs or disruptive breakdown, that operates the switch upon occurrence of an electric arc or disruptive breakdown, in such a way that electrical energy producing a plasma will no longer be applied to the electrodes.The invention is characterised by the provisions that the inductive resistor(s) is (are) each connected to a recovery diode and that the switch is a series switch.In another embodiment of the invention a controller or closed-loop controller, respectively, is provided which, upon occurrence of an electric arc or disruptive breakdown, respectively, extinguishes same by disconnecting the voltage applied to the electrodes or by commutation to an inverted voltage for a defined period of time (deactivation interval), and which, upon occurrence of at least one electric arc or disruptive breakdown event, reduces the activation interval of the voltage causing plasma operation.

A method for measuring current in each phase of a three-phase inverter driven motor is based on the three-phase inverter being controlled in a PWM mode by three PWM signals including the use of a common DC-link current sensing resistor. The current on the sensing resistor is intermittently sampled. The method includes determining a modulation index for the voltage demand set by a motor controller. Based on specific mutual duty cycle conditions of the three PWM phase driving signals, sampling windows of sufficient duration are created for allowing distinct sampling of two of the phase currents.

A sulfur hexafluoride gaseous discharge micro component infrared detection device and method relates to a sulfur hexafluoride gaseous infrared absorption spectrum analysis device and method. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a non local discharge protective resistor, a standard capacitance voltage divider, a GIS analogue element, a non inductive resistance, a Fourier transform infrared spectrometer and a wideband high speed super capacity digital storage oscilloscope; wherein the gas tank in the Fourier transform infrared spectrometer is a long optical distance one. The method of the invention includes that discharge micro component detection is carried out on SF6 gas sample in GIS by utilizing the device ofthe invention. The invention can accurately detect various products produced by gas discharge decomposition of SF6 and has the characteristics of high detection precision, high spectrum resolution, good absorption peak symmetry, high signal to noise ratio and the like. The invention can be widely applicable to GIS equipment online running local discharge and provides reliable data for GIS equipment online running state analysis.

In one aspect of the present invention, an induction resistivity tool incorporated into a downhole tool string component comprises an annular radial recess disposed along an outside surface of a tubular wall of the downhole component. At least one electrically insulated induction coil is disposed in the radial recess and adapted to transceive induction signals outward from the tubular wall when carrying an electrical current. The at least one coil is tuned for an optimal signal frequency and an actuator in the downhole component is adapted to put an electrically conductive element into and out of electrical contact with the at least one coil and thereby change the optimal signal frequency.

In one aspects of the present invention, an induction resistivity tool incorporated into a downhole tool string comprises a downhole tool string component comprising a mid-body intermediate first and second tool joints adapted for connection to adjacent tool string components. The mid-body comprises a central bore formed within a tubular wall of the component, the tubular wall comprising an inner and outer diameter. At least one annular radial recess is formed in the outer diameter of the mid-body and comprises a coil adapted to transceive induction signals outwardly from the mid-body, and at least one flexible ring of magnetically conducting material is disposed intermediate the coil and a surface of the recess and arranged within the annular radial recess such that it filters a range of frequencies of the induction signals.

In one aspect of the invention an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component having an outer diameter. At least one induction transmitter assembly is disposed along the outer diameter. The transmitter assembly comprises at least one coil array and at least one induction transmitter coil wound about at least one core. The coil array comprises a plurality of magnetic units and each unit comprising a magnetic field orientation. The magnetic field orientations accumulatively form a Halbach array with an augmented field side and a canceled field side of the array. The transmitter assembly generates an induction signal from outside the outer wall and substantially prevents the signal from entering the outer wall when the transmitter assembly is carrying an electrical current.

An apparatus and method for displaying battery capacity and a charge / discharge state of a portable device are provided. The apparatus includes a charge Integrated Circuit (IC) for providing current to recharge the battery using an external charge power source, a sensing resistance interposed between the battery and the charge IC, a switch connected to the sensing resistance in parallel and opened to flow the current to the sensing resistance when a capacity of the battery is measured, and a controller for determining the capacity of the battery using voltage values at both ends of the sensing resistance measured when the switch is opened.

A method of noncontact measuring the electrical conductivity of electrolytes using a primary measuring transformer includes placing the electrolyte in a sampler, exciting an alternating magnetic field using an axisymmetrical eddy current sensor, switching to the sensor a capacitor of variable capacitance, tuning of the formed circuit in resonance with the frequency of the generator of harmonic oscillations, and recording the change in the introduced active resistance of the parametric eddy current sensor rated against its own inductive resistance.

The invention discloses a spot-weld machine and aims to solve the problems of low welding efficiency and poor welding quality when the conventional spot-weld machine is used for welding a chip lead of a non-inductive resistance chip. In order to fulfill the aim, the invention discloses the spot-weld machine. The machine comprises a turntable mechanism, and a wire feeding mechanism, a welding mechanism, a wire cutting mechanism and a material taking mechanism which are arranged along the outer edge of the turntable mechanism in the rotating direction of the turntable mechanism, wherein the wire feeding mechanism, the welding mechanism and the wire cutting mechanism are connected adjacently to form a working whole. The spot-weld machine of the invention can realize automatic high-speed production and the quality of a welded workpiece is stable and reliable.

In one aspect an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component comprising an outer diameter and at least one induction transmitter assembly disposed along the outer diameter. The at least one transmitter assembly comprises at least one induction transmitter coil wound about at least one core. The at least one transmitter coil is adapted to project an induction signal outward from the outer wall when the at least one transmitter coil is carrying an electrical current. The transmitter assembly is adapted to create electromagnetic fields that originate the induction signal from outside the outer wall and substantially prevent the signal from entering the outer wall.

A sensor measures the current in high frequency pulses (e.g., pulses having fast rise times) that are transported on coaxial transmission lines. The sensor includes an entrance coaxial conductor and an exit coaxial conductor that are interconnected by a continuous inner conductor. The outer conductors of the two coaxial conductors are interrupted and are interconnected by a sensing resistor with a substantially constant resistance. An output sensor coaxial conductor has an inner conductor electrically connected to a first end of the sensing resistor and has an outer conductor connected to a second end of the sensing resistor. Tapered ferrite cores are placed around the three coaxial conductors proximate the connections to the sensing resistor. Preferably, the sensing resistor is a tubular resistor formed on a dielectric cylindrical tube. The sensor is enclosed within a continuous conductive housing.

In one aspect an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component comprising an outer diameter and at least one induction transmitter assembly disposed along the outer diameter. The at least one transmitter assembly comprises at least one induction transmitter coil wound about at least one core. The at least one transmitter coil is adapted to project an induction signal outward from the outer wall when the at least one transmitter coil is carrying an electrical current. The transmitter assembly is adapted to create electromagnetic fields that originate the induction signal from outside the outer wall and substantially prevent the signal from entering the outer wall.

In one aspect of the invention an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component having an outer diameter. At least one induction transmitter assembly is disposed along the outer diameter. The transmitter assembly comprises at least one coil array and at least one induction transmitter coil wound about at least one core. The coil array comprises a plurality of magnetic units and each unit comprising a magnetic field orientation. The magnetic field orientations accumulatively form a Halbach array with an augmented field side and a canceled field side of the array. The transmitter assembly generates an induction signal from outside the outer wall and substantially prevents the signal from entering the outer wall when the transmitter assembly is carrying an electrical current.

A method of calibrating parameters of an apparatus for measuring a back electromotive force (BEMF) of a voice coil motor (VCM) for moving a head on a disk, the apparatus including the VCM having a coil resistance Rm, a coil inductance Lm, and a sensing resistance Rs, including: controlling the VCM to sequentially perform a track following operation of the head on a first track, a transferring operation of the head from the first track to a second track, and a track following operation of the head on the second track; sampling a differential voltage Vadc between a voltage across the VCM and a voltage across the sensing resistance Rs and a VCM driving current Im during the transferring operation; calculating a slope S based on a ratio of a first integration value to a second integration value, where the first integration value is obtained by integrating a product of the sampled differential voltage Vadc and the VCM driving current Im during the transferring operation, the second integration value being obtained by integrating a square of the VCM driving current Im during the transferring operation, the slope S being defined by the equation S=Rm−Gb×Rs, Gb being a gain of an amplifier for amplifying the voltage across the sensing resistance Rs; and calibrating the parameters of the apparatus using the slope S.

The invention provides a laser touch panel, laser touch display equipment, a laser touch display system and a laser touch method of the laser touch panel. The laser touch panel comprises a first conductive layer, a second conductive layer and a photo-inductive resistance change material layer, wherein the photo-inductive resistance change material layer is arranged between the first conductive layer and the second conductive layer and is electrically connected with the first conductive layer and the second conductive layer; and the photo-inductive resistance change material layer is set to perform resistance change in a touch position irradiated by laser. The laser touch panel can be used for implementing long-distance laser touch on display equipment.

An integrated circuit includes a capacitor and a non-inductive resistor. A substrate has a capacitor area and a resistor area. A patterned stacked structure including a bottom conductive layer, an insulating layer and a top conductive layer from bottom to top is sandwiched by a first dielectric layer and a second dielectric layer disposed on the substrate. A first metal plug and a second metal plug contact the top conductive layer and the bottom conductive layer of the capacitor area respectively, thereby the patterned stacked structure in the capacitor area constituting the capacitor. A third metal plug and a fourth metal plug contact the bottom conductive layer and the top conductive layer of the resistor area respectively, and a fifth metal plug contacts the bottom conductive layer and the top conductive layer of the resistor area simultaneously, thereby the patterned stacked structure in the resistor area constituting the non-inductive resistor.

A DC-DC converter includes a chip including an error amplifier and a pulse width modulator (PWM) having an input connected to an output of the error amplifier, and an inductor driven by said PWM in series with an output node (VOUT) of the converter, wherein a load current flows through the inductor. VOUT is fed back through a network including a feedback resistor (RFB) to an inverting input of the error amplifier. A circuit for sensing the load current includes a first operational amplifier, a sense resistor on the chip having resistance RSENSE coupled to an inverting input of the first amplifier; wherein a sense current related to the load current flows through the sense resistor, a dependent current source provides an output current to supply the sense current. A reference resistor is disposed on the chip having a resistance RREFERENCE which is a fixed multiple of RSENSE. A set resistor is provided having a resistance RSET. Tracking circuitry sets a voltage across the reference resistor to be equal to a voltage across the set resistor. A function block is coupled to receive a current through the set resistor and a current through the reference resistor to find their ratio. A current multiplier is provided, wherein an output of the function block is coupled to the current multiplier. The current multiplier provides a measurement current which is proportional to the load current divided by RSET.

The invention provides a composite adaptive model prediction control method of a Boost converter. The method includes: establishing a continuous model according to an equivalent circuit of the Boost converter in different switching states, performing discretization on the continuous model, and obtaining a discrete model of the Boost converter; designing a Luenberger observer by regarding a circuitoutput voltage and an inductive current as quantities of state based on the discrete model of the Boost converter, and obtaining observed values of an inductive resistance and a load resistance; establishing a controller of the Boost converter, and regarding a PI controller and a feedforward compensator based on the discrete model as an outer loop; regarding model prediction control as an inner loop; forming a value function based on the square of the difference between an inductive current reference value generated by the outer loop and an inductive current predicted value of the inner loop;and selecting an optimal switching state through minimization of the value function. According to the method, prediction results of different switching states are compared through the value functionto obtain the optimal switching state and realize tracking control of current and voltage so that stabilization can be rapidly recovered from disturbance.

The invention discloses a transistor small signal equivalent circuit model, which comprises an electrode parasitic part at each electrode part, wherein each electrode parasitic part comprises a step inductive resistance structure; each step inductive resistance structure comprises a parasitic inductor and a parasitic resistor which are mutually connected in series; the high-order parasitic resistor is mutually connected with the high-order parasitic inductor in series, and then is connected with the parasitic resistor in parallel. The module better reflects the high-order parasitic effect relating to semiconductor active devices at high frequency, therefore, the performance of a transistor can be simulated more accurately, and the transistor small signal equivalent circuit model can be used for circuit design, or guiding device preparation and process improvement.

A power factor correction circuit used for regulating the phase of a DC current outputted from a rectifier unit in a power supply includes an energy inductor, an output diode, a switch unit, a pulse width modulation unit, a sensing resistor, and a converter transformer. The converter transformer utilizes the DC current outputted from the rectifier unit to generate an induced current, which will pass through the two ends of the sensing resistor to produce a reference voltage, thereby the pulse width modulation unit can produce the duty cycle for the switch unit according to the reference voltage, so that the switch unit can regulate the phase of the DC current through controlling the flowing direction of the DC current.

A circuit design for a circuit for switching currents is disclosed, comprising at least one switch element (T1 . . . Tn, T1′ . . . Tn′), and at least one respective main current conductor (D, S, A) for interlinking the switch element, the poles (V+, GND) of a current source and an energy accumulator (C). The aim of the invention is to reduce ohmic resistance and inductive resistance of such a circuit. To this end, an ancillary current conductor (D1, S1, A1) that has a lower current carrying capacity than the main current conductor is connected in parallel to at least one of the main current conductors (D, S, A).

Disclosed is a high-efficiency LED driver chip and a driver circuit of the chip, and the driver chip includes a detection unit, a comparison unit and a correction unit. The LED detection unit detects the operating current of the LED driver circuit by an external sensing resistor and an internal current mirror to output a setup signal, and the comparison unit detects the driving current of at least one LED by an external comparing resistor to output an initialization signal, so that the correction unit can output a correction signal according to the setup signal and the initialization signal to reduce the power loss of the circuit while maintaining the driving current constant, so as to improve the illumination quality and the service life of the LED.

The invention is related to linear amplifier (LA), and high power pulse electrical source (HPPES). LA uses power unit IGBT as linear unit. HPPES uses LA. LA is composed of two operational amplifiers, one power unit IGBT, and a non-inductive resistance. HPPES consists of a main current source, two current sources I1 and I2, two controllable voltages, three capacitors, switch K, diode D, inductance L, and non-inductive current limiting resistance. Whole circuit forms controllable linear current source with good tracking performance, and characteristic of constant current source. Using variable supply power, HPPES lowers wastage of power unit so as to raise efficiency of system.

A switchable resistive device has a multi-layer thin film structure interposed between an upper conductive electrode and a lower conductive electrode. The multi-layer thin film structure comprises a perovskite layer with one buffer layer on one side of the perovskite layer, or a perovskite layer with buffer layers on both sides of the perovskite layer. Reversible resistance changes are induced in the device under applied electrical pulses. The resistance changes of the device are retained after applied electric pulses. The selected duration of the electrical pulse is in the range of from about 8 nanosecond to about 100 milliseconds. The selected maximum value of the electrical pulse is in the range of from about 1 V to about 150 V. The electrical pulse may have square, saw-toothed, triangular, sine, oscillating or other waveforms, and may be of positive or negative polarity.

The circuit arrangement for generating square pulses according to a magnetic field strength has an edge-triggered flip-flop a comparator connected to the flip-flop; a bridge with four bridge segments, each including an electronically controlled switch, and with a transverse branch including an energy-storing element consisting of an inductive resistor acting as a magnetic field probe; and a switching threshold resistor connected with the energy-storing element and with a signal input of the comparator. The switches are each connected in pairs in crossover fashion by the flip-flop, so that current flow in the transverse branch is reversible. An improved compensation current sensor, which is less sensitive to component tolerances, includes the circuit arrangement for generating square pulses in a controller.

The device includes DC power supply, transformer, rectification module, data acquisition card, single process and protection module, signal amplification module, computer, relay, non-inductive resistance etc.. Including two pieces of triodes, the control signal amplification module magnifies a control signal sent from the computer by the said amplifying circuit in order to realize function of attenuating DC through controlling on / off of the relay. The single process and protection module includes operational amplification circuit (OAC), control switch, regulation tube. Being obtained from input signal of passing through OAC, the amplified voltage signal subtracts difference mode signal obtained by two control switches, then is amplified in operational amplifier. Amplified attenuation signal is sent to the data acquisition card which transfers collected signal to computer for carrying out calculating parameter of reactance.

The invention provides voltage converting equipment, comprising input interfaces which are connected with a power adapter of a computer, an inductive resistor which is used for inducting output voltage signals of the power adapter, a plurality of power switches of the power adapter which are used for setting rated power of the power adapter, a comparator which is used for comparing received voltage values with voltage values corresponding to the selected rated power and outputting control signals in accordance with the comparison result, a first control switch which is switched off when the power adapter is in an underloading state and switched on when the power adapter is in a full load state, an electric pressure converter which is used for converting the received voltage, output interfaces which are used for providing a voltage output by the power adapter for the computer, and a plurality of output ports which are used for providing a voltage output by the electric pressure converter for correspondingly connected electronic equipment. The voltage converting equipment is used for providing a working voltage for a notebook computer and providing different voltage output interfaces to meet different voltage demands.

A absorptive phase-regulating vessel refrigerating machine, belongs to vessel refrigerating machine comprising two-way intake valve, hot end vessel heat-exchanger, vessel, cold end vessel heat exchanger, cold head, cold-end heat exchanger of regenerator, regenerator, hot end heat exchanger of regenerator; its characteristics are a absorber connected with it is also set on the outer end of the said hot end vessel heat-exchanger, through the good capacitance and inductive resistance effect of absorber to replace the gas storeroom and inertia tube so as to achieve the best phase shift the refrigerating machine required in operation. Compared with the present vessel refrigerating machine installed with gas storeroom and inertia tube, the system has compact structure, good phase modulation capability, good stability and lower energy consumption, and will contribute to large-scale commercial application of vessel refrigerating machine.

In a semiconductor device with an overcurrent protection function for a horizontal type insulated gate bipolar transistor, current bias is reduced by overcurrent protection. A horizontal type insulated gate bipolar transistor (1) of a main switch element controlled by gate voltage and a horizontal type insulated gate bipolar transistor (10) for current detection are connected in parallel. A base area (109) of the horizontal type insulated gate bipolar transistor (10) and an emitter region (106) of the horizontal type insulated gate bipolar transistor (1) are connected electrically. An emitter region (108) of the horizontal type insulated gate bipolar transistor (10) and the emitter region (106) of the horizontal type insulated gate bipolar transistor (1) are connected electrically by an induction resistor (4) of a current sensing circuit (7).