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2502 results about "Low impedance" patented technology
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A low impedance means that the circuit draws or provides more power on the signal. Say the circuit under question (circuit B) is interfaced to circuit A on the input side and circuit C on the output side.
Electrosurgical generator
ActiveUS7211081B2Reducing switching transientPromote resultsSurgical instruments for heatingCapacitor voltageEngineering
An electrosurgical generator for supplying RF power to an electrosurgical instrument for cutting or vaporising tissue has an RF output stage (42) with an RF power bridge (Q1, Q2, Q3, Q4), a pair of output lines (74) and a series-resonant output network (48). The output impedance of the output stage (42) at the output lines (74) is less than 200 / √P ohms, where P is the maximum continuous RF output power of the generator. The generator offers improved cutting and vaporising performance, especially in relation to the reliability with which an arc can be struck when presented with an initial low impedance load. Overloading of the output stage is prevented by rapidly operating protection circuitry responsive to a predetermined electrical condition such as a substantial short-circuit across the output lines. In the preferred embodiment, the output stage is capable of maintaining output pulses at least 1kW peak by supplying the power bridge from a large reservoir capacitor (60). Pulsing is dynamically variable in response to load conditions by controlling the maximum energy per pulse in response to the reservoir capacitor voltage.
Owner:GYRUS MEDICAL LTD
Electrical motor driven nail gun
InactiveUS6705503B1Easy to handleReduce wearStapling toolsReciprocating drilling machinesEngineeringFlywheel
A portable electric nailing gun operating from a power supply. The motor accelerates a flywheel, which at the appropriate energy state is coupled through a mechanism to an anvil acting directly on the nail. The actuation is governed by a control circuit and initiated from a trigger switch. The stored energy delivered from the motor is coupled to the output anvil drives the nail. At least one position of the output anvil is sensed and once the nail is driven, the power is disconnected from the motor. This method uses a direct acting clutch and a harmonic motion nailing mechanism to reduce wear and increase robustness of the nailer. Elastic elements are used to limit stresses during the impact periods. The electrical control circuit and sensors allow precise control and improve safety. The power supply is preferably a rechargeable low impedance battery pack.
Owner:TRICORD SOLUTIONS
Leak detection tape
InactiveUS6175310B1Simple and inexpensiveEliminate needDetection of fluid at leakage pointBaby linensElectricityElectrical conductor
An elongated, flexible, flat conductive tape can be applied to any surface to be monitored for water or other liquid leaks, and electrically connected to any suitable type of conventional electrically operated leak detector. A pair of parallel spaced conductors is disposed on one side of the tape that run longitudinally along the length thereof. The conductors are spaced from one another by a small distance to insure that only a small quantity of water or other conductive liquid is necessary to bridge the gap between the conductors, and create an electrical short circuit or substantial impedance reduction between the two. In addition, the conductors are preferably as flat as possible to insure that liquid can freely flow transversely across them without being impeded thereby. Both of these features insure that the detector tape can sense even very small quantities of liquid, thereby generating an early warning of a leak condition before extensive damage results. A liquid responsive visible indication is also provided on the tape to identify the location along the tape where water or other leaking liquid has come in contact therewith, and eliminates the need for using an expensive sensing device to locate the source of a leak.
Owner:GOTT RICHARD J
Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter
Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter. A device that routes ablation energy to and that routes mapping signals received from an electrophysiology catheter having a plurality of conductive filaments including circuitry that provides, for each conductive filament when ablation energy is being delivered, an electrical signal path that has a low impedance for ablation energy and a high impedance for mapping signals. The device also includes circuitry that provides, for each conductive filament, when mapping signals are being received, an electrical signal path that has a high impedance for ablation energy and low impedance for mapping signals. At least one switch is provided that selectively groups electrodes into sectors for delivery of ablation energy.
Owner:BOSTON SCI SCIMED INC
Methods for electrosurgical tissue treatment in electrically conductive fluid
InactiveUS7169143B2Control depthReducing power delivery and ablation rateDiagnosticsHeart valvesTarget tissueLow impedance
Owner:ARTHROCARE
Pseudo-differential interfacing device having a switching circuit
InactiveUS7884648B2Reduce couplingReduced unwanted couplingReliability increasing modificationsElectronic switchingDifferential transmissionEngineering
The invention relates to an interfacing device for pseudo-differential transmission through interconnections used for sending a plurality of electrical signals. The interfacing device of the invention includes signal terminals and a common terminal. A transmitting circuit receives the input signals of the transmitting circuit coming from a source. The output of the transmitting circuit delivers, when the transmitting circuit is in the activated state, voltages between one of the signal terminals and the reference terminal (ground). A receiving circuit delivers, when the receiving circuit is in the activated state, output signals of the receiving circuit determined each by the voltage between one of the signal terminals and the common terminal, to the destination. In the closed state, the common terminal switching circuit is, for the common terminal, equivalent to a voltage source delivering a constant voltage, connected in series with a passive two-terminal circuit element presenting a low impedance.
Owner:ZXNOISE LLC
Electrosurgical method using laterally arranged active electrode
InactiveUS6960204B2Control depthReducing power deliveryHeart valvesDiagnosticsActive electrodeElectrode array
An electrosurgical probe comprises a shaft having an electrode array (12) at its distal end and a connector at its proximal end. The array (12) includes a plurality of isolated electrode terminals, and an electrosurgical power supply (28) is provided with a multiplicity of independently limited or controlled current sources and a connector. The electrosurgical probe and the power supply may be connected through their respective connectors so that the independent current sources are connected to individual electric terminals. By applying very high frequency electrical energy to the electrode array, target tissue may be cut or ablated while heat dissipation through low impedance paths, such as blood and normal saline, will be minimized.
Owner:ARTHROCARE
Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter
Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter. A device that routes ablation energy to and that routes mapping signals received from an electrophysiology catheter having a plurality of conductive filaments including circuitry that provides, for each conductive filament when ablation energy is being delivered, an electrical signal path that has a low impedance for ablation energy and a high impedance for mapping signals. The device also includes circuitry that provides, for each conductive filament, when mapping signals are being received, an electrical signal path that has a high impedance for ablation energy and low impedance for mapping signals. At least one switch is provided that selectively groups electrodes into sectors for delivery of ablation energy.
Owner:BOSTON SCI SCIMED INC
Skin electrode
InactiveUS6845272B1Reduced shelf lifeExtended shelf lifeElectrocardiographySensorsMaterials scienceMetal
An electrode for establishing electrical contact with the skin is disclosed, said electrode having a low impedance and comprising an electrically conductive metallic layer (4) and an electrically conductive gel (12) attached to said metallic layer, wherein the pH of the electrically conductive gel (12) is chosen so as to provide a corrosion of the metallic layer (4).
Owner:MEDICOTEST SYSTR
Capacitive Touch Panel with Low Impedance
ActiveUS20090085891A1Reduce resistanceSystem coupling capacitance and resistanceElectronic circuit testingStatic indicating devicesDisplay deviceDielectric layer
A capacitive touch panel and a display device using the capacitive touch panel are provided. The capacitive touch panel includes a first electrode layer, a second electrode layer, and a dielectric layer disposed between two layers. The first electrode layer has a plurality of first A electrode strings and first B electrode strings extended along a first direction. The first A electrode string and the first B electrode string respectively has a plurality of first direction electrodes. The second electrode layer has a plurality of second direction electrodes connected in series along a second direction. The first A and B electrode strings are disconnected in the first electrode layer while they are simultaneously detected for presence of signal variation.
Owner:AU OPTRONICS CORP
Electronic circuit with reverberation effect and improved output controllability
InactiveUS20050152558A1Low costSimple processElectrophonic musical instrumentsGain controlEngineeringVoltage source
An electronic circuit for adding the effects of reverberation to a high impedance signal produced from an external audio source such as a guitar pickup or a high impedance microphone. The electronic circuit comprises a reverberation effects circuit having pre-amplifier / driver and recovery amplifier sections and a spring reverberation device coupled thereinbetween and a reverberation effects bypass at the circuit's input, prior to switchably passing the audio signal into an input of the pre-amplifier / driver section which comprises a low impedance, high current output for input into the spring reverberation device having an output for passing a low impedance signal to the recovery amplifier section, which suitably serves in increasing the impedance of the signal to a predetermined level acceptable for input into an external sound device such as an amplifier having channel inputs and audio control capabilities, and a power supply circuit having means for switching between a dc voltage source and an ac voltage source and supplying ±9 volts to integrated circuits (ICs) included in the pre-amplifier / driver and recovery amplifier sections of the reverberation effects circuit.
Owner:VAN TASSEL TIMOTHY DALE
System and Method for Driving LED
ActiveUS20070285031A1Accurate estimateLow costElectroluminescent light sourcesDc-dc conversionAverage currentPeak value
Owner:CHEMTRON RES
RF transceiver switching system
The present invention relates to transceiver systems and methods which employ shunt switches during transmit and receive operating modes. The shunt switches may be configured with various reactive networks to achieve high or low impedance states at power amplifiers or low noise amplifiers in order to reflect or transmit power along a given path. The shunt switches are designed for protection against excessive voltage swings that would otherwise damage components in the transceiver switching circuit. The switching circuits may be implemented in a single chip architecture, which results in manufacturing efficiencies, lower cost and higher reliability circuits. Single or multi band devices may also be employed.
Owner:RESONANCE SEMICON CORP
System for supplying energy
InactiveUS20110278948A1Reduce risk of damageGuaranteed uptimeElectrotherapyElectromagnetic wave systemControl signalEngineering
A coil arrangement supplies energy or control signals to, or provides information from, a medical device implanted in a human or animal patient. The coil arrangement includes an external coil that is larger than an implanted coil so as to reduce the risk of damage to circuitry in an energy transmitter attached to the external coil that results from a low impedance at the external coil when a switch in an over-voltage protection circuit is opened to protect circuitry in a medical device attached to the implanted coil from being damaged by a too high voltage induced across the implanted coil.
Owner:FORSELL PETER
Mri-safe high impedance lead systems
ActiveUS20090171421A1High impedanceAvoid damageTransvascular endocardial electrodesExternal electrodesMedicineHemt circuits
Some embodiments are directed to MRI / RF compatible medical interventional devices. A plurality of spaced apart high impedance circuit segments are configured to have a high impedance at a high range of radiofrequencies and a low impedance at a low range of frequencies The high impedance circuit segments may comprise co-wound coiled inductors and can reduce, block or inhibit RJ-transmission along the lead system (20) during exposure to RF associated with a high-Held magnet MRI systems, while permuting passage of low frequency physiologic signals, treatments and / or stimuli The devices can include at least one electrode
Owner:BOSTON SCI NEUROMODULATION CORP
Lithium secondary cell with high charge and discharge rate capability and low impedance growth
ActiveUS20070166617A1Cheap to makeHigh dischargeSecondary cellsNon-aqueous electrolyte accumulator electrodesHigh rateFast charging
A lithium-ion battery is provided that has a fast charge and discharge rate capability and low rate of capacity fade during high rate cycling. The battery can exhibit low impedance growth and other properties allowing for its use in hybrid electric vehicle applications and other applications where high power and long battery life are important features.
Owner:A123 SYSTEMS LLC
Low voltage silicon controlled rectifier (SCR) for electrostatic discharge (ESD) protection of silicon-on-insulator technologies
InactiveUS20050212051A1Low triggeringLow holding voltageTransistorThyristorSilicon-controlled rectifierLow voltage
Owner:SOFICS BVBA
Low impedance implantable extension for a neurological electrical stimulator
InactiveUS6671544B2Reduce energy consumptionLower impedanceSpinal electrodesExternal electrodesElectrical conductorMedical treatment
A medical device known as an implantable neurostimulation system is configured for implanting in humans to deliver a therapeutic electrical stimulation to tissue to treat a variety of medical conditions such as pain, movement disorders, pelvic floor disorders, and many other conditions. The implantable neurostimulation has a housing, a power supply carried in the housing, stimulation electronics coupled to the battery and coupled to a neurostimulator connector block, a stimulation lead, and a lead extension. The lead extension is electrically coupleable between the neurostimulation connector block and the stimulation lead. The extension conductor is composed of an outer surface and an inner core. The outer surface has an outer impedance and the inner core has a core impedance that is substantially lower than the outer impedance. Many embodiments of the low impedance lead extension are possible.
Owner:MEDTRONIC INC
Scalable Periphery Tunable Matching Power Amplifier
A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.
Owner:PSEMI CORP
Component operating with bulk acoustic waves and a method for producing the component
ActiveUS6998940B2Contributed to reliabilityEasy to flattenPiezoelectric/electrostrictive device manufacture/assemblyImpedence networksAcoustic waveAcoustic impedance
A component operating with bulk acoustic waves has a carrier substrate, a thin-film resonator and an acoustic mirror arranged between the resonator and carrier substrate. The acoustic mirror is formed by at least one high acoustic impedance layer, which is covered by a low acoustic impedance layer and the uppermost low impedance acoustic layer is planarized to form a flat planar surface on which the thin-film resonator is formed.
Owner:SNAPTRACK
Low voltage silicon controlled rectifier (SCR) for electrostatic discharge (ESD) protection of silicon-on-insulator technologies
ActiveUS6909149B2Low triggeringLow holding voltageTransistorThyristorSilicon-controlled rectifierLow voltage
A silicon-on-insulator (SOI) electrostatic discharge (ESD) protection device that can protect very sensitive thin gate oxides by limiting the power dissipation during the ESD event, which is best achieved by reducing the voltage drop across the active (protection) device during an ESD event. In one embodiment, the invention provides very low triggering and holding voltages. Furthermore, the SOI protection device of the present invention has low impedance and low power dissipation characteristics that reduce voltage build-up, and accordingly, enable designers to fabricate more area efficient protection device
Owner:SOFICS BVBA
RFID (radio frequency identification) and IC card
InactiveUS6972662B1Reduce voltage marginVariation width of a power supply voltage of the IC is rather largeOther printing matterData resettingEngineeringVoltage range
An RFID which provides a wide working voltage range and general versatility at low cost, without the need for changing its internal circuit design due to external factors. In the RFID, there is provided an arrangement that a low impedance state is given when its internal data communication circuit is in a reset state.
Owner:RENESAS ELECTRONICS CORP
Static build-up control in dispensing system
Owner:GPCP IP HLDG LLC
Dimmer having a microprocessor-controlled power supply
Owner:LUTRON TECH CO LLC
Multi-Mode Dimmer Interfacing Including Attach State Control
A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii) attaching a dimmer to a power converter system at the leading edge of a phase-cut, rectified input voltage, (iii), control of switch mode power conversion, and (iv) an inactive state to, for example, reduce the dimmer current while allowing a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), (iii), and (iv) the controller controls a power converter system that is compatible with a triac-based dimmer.
Owner:SIGNIFY HLDG BV
Portable electrical motor driven nail gun
A portable electric nailing gun operating from a power supply. The motor accelerates a flywheel which at the appropriate energy state is coupled through a mechanism to an anvil acting directly on the nail. The actuation is governed by a control circuit and initiated from a trigger switch. The motor accelerates a flywheel that is then clutched to the output anvil causing the nail to be driven. The position of the output anvil is sensed and once the nail is driven, the motor is dynamically braked reducing the excess energy in the flywheel. This method uses a highly responsive motor and power supply which enables the motor to come up to speed, drive the nail and return to a low energy condition in less than 2 seconds. The electrical control circuit and brake allow precise control and improve safety. The power supply is preferably a rechargeable low impedance battery.
Owner:TRICORD SOLUTIONS
ESD protection circuit
ActiveUS7164565B2Low impedance pathSolid-state devicesEmergency protective arrangements for limiting excess voltage/currentEngineeringIntegrated circuit
An ESD protection circuit for an integrated circuit includes an ESD clamping circuit, an ESD triggering circuit, and an ESD disabling circuit. The ESD clamping circuit is operably coupled to a first power pin of the integrated circuit and a second power pin of the integrated circuit. The ESD triggering circuit is operably coupled to the ESD clamping circuit, wherein, when enabled and when sensing an ESD event, the ESD triggering circuit provides a clamping signal to the ESD clamping circuit such that the ESD clamping circuit provides a low impedance path between the first and second power pins. The ESD disabling circuit is operably coupled to disable the ESD triggering circuit when the integrated circuit is in a normal operating mode.
Owner:APPLE INC
Stabilizer for switch-mode powered RF plasma
InactiveUS6046546AAvoid instabilityEffect can be causedElectric discharge tubesAc-dc conversionHarmonicInstability
Circuitry and techniques designed to allow stable and continuous delivery of alternating power to a plasma with switch-mode power supply (16) include a variety of embodiments. Parallel, series, and other circuit elements connected across switching element (7) are tuned so that energy at other than the fundamental frequency is absorbed and dissipated. This energy may be only at the second harmonic or it may be across broad frequency ranges through selecting high impedance at the fundamental frequency and relatively low impedance at other frequencies. In overcoming instabilities, oscillations, and even changing class of operation of the switch-mode power supply, the stabilizing element absorbs the energy to avoid allowing it to affect switch (7) of power supply (16).
Owner:ADVANCED ENERGY IND INC
Dual operating mode electronic disabling device for generating a time-sequenced, shaped voltage output waveform
InactiveUS6999295B2Increase the air gapHigh impedanceElectric shock equipmentsPistolsLow voltageEngineering
Owner:AXON ENTERPRISE INC
Power amplifier
ActiveUS7193472B2Improve efficiencyLow output level rangeAmplifier modifications to raise efficiencyAmplifier combinationsAudio power amplifierEngineering
In a power amplifier a Doherty amplifier is provided with an output higher harmonic reflection circuit that is connected to the output terminal of a first FET chip and sets an even-numbered higher harmonic load of an output signal at the output terminal to be a short-circuit, or at a low impedance approximating a short-circuit, and sets an odd-numbered higher harmonic load of an output signal at the output terminal to be an open-circuit, or a high impedance approximating an open-circuit.
Owner:MURATA MFG CO LTD
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