116 results about "Inductive Resistance" patented technology

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.

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.

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.

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.

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.

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 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.

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.