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21311results about "Emergency protective arrangements for limiting excess voltage/current" patented technology
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Method for operating a power tool
ActiveUS7336048B2Maintain good propertiesReduce widthTemperatue controlEmergency protective arrangements for automatic disconnectionMOSFETElectricity
In a method for operating a power tool with an energy accumulator, in particular a rechargeable energy accumulator, which supplies power to an electric drive motor, a clock frequency is generated by an electronic unit, with which a gate of a MOSFET—which supplies operating voltage to the drive motor—is switched on with each cycle, and a switching-off of the MOSFET is carried out within one cycle using different signals, as a function of operating parameters.
Owner:ROBERT BOSCH GMBH
Constant-voltage switching power supply provided with overvoltage output protecting circuit, and electronic apparatus provided with overvoltage protecting circuit
ActiveUS7215517B2Dc-dc conversionEmergency protective arrangements for limiting excess voltage/currentOvervoltageElectricity
An overvoltage output protector is electrically connected to a constant-voltage switching power supply which includes a switching transistor converting a DC voltage obtained by smoothing an AC voltage supplied from an AC power source into a cyclic pulse signal. In the overvoltage output protector, an overvoltage monitor whether a potential of the cyclic pulse signal is a predetermined value or more. A deactivator turns off the switching transistor in a case where the overvoltage monitor judges that the potential of the cyclic pulse signal is the predetermined value or more.
Owner:SEIKO EPSON CORP
Electric surgical instrument with optimized power supply and drive
ActiveUS20070270784A1Comfortably fit into a user's handReduce manufacturing difficultySuture equipmentsStapling toolsAverage currentActuator
A surgical instrument includes a surgical end effector having at least one actuation assembly to effect a surgical procedure when actuated, an electric motor operationally connected to the end effector to operate the at least one actuation assembly, and a power supply electrically connected to the motor and selectively powering the motor to actuate the actuation assembly. The power supply has a battery cell with a critical current rate and, when activated to power the motor and actuate the actuation assembly, operates the cell at a super-critical current rate or at an average current rate above the critical current rate. The power supply selectively powers the motor to actuate the assembly less than 16 times during a clinical life of at least one of the end effector, the motor, and the power supply. When actuated, the assembly operates only between 0.5 seconds and 16 seconds in duration.
Owner:CILAG GMBH INT
Power supply control device, method for controlling power supply, program and power supply device
InactiveUS8369056B2Arrangements responsive to excess currentArrangements responsive to underloadControl powerPower flow
A power supply control device for controlling power supply to a pair of terminals to which a load is connected, comprising a voltage measuring part for measuring a voltage which has a predetermined relationship with the voltage of the pair of terminals, a short circuit detecting part for detecting whether a short circuit exists between the pair of terminals based on the measured voltage and for making power supply to the pair of terminals stop when existence of a short circuit is detected, and a constant current supplying part for supplying a constant current though the pair of terminals; wherein the short circuit detecting part is configured to detect that the previously detected short circuit is eliminated when the voltage measured by the voltage measuring part is equal to or greater than a predetermined threshold value upon supplying the constant current through the pair of terminals.
Owner:TDK LAMBDA CORP +1
Distributed maximum power point tracking system, structure and process
ActiveUS20080238195A1Sure easyExtended operating timeBatteries circuit arrangementsConversion with intermediate conversion to dcNuclear engineeringControl system
Distributed maximum power point tracking systems, structures, and processes are provided for power generation structures, such as for but not limited to a solar panel arrays. In an exemplary solar panel string structure, distributed maximum power point tracking (DMPPT) modules are provided, such as integrated into or retrofitted for each solar panel. The DMPPT modules provide panel level control for startup, operation, monitoring, and shutdown, and further provide flexible design and operation for strings of multiple panels. The strings are typically linked in parallel to a combiner box, and then toward and enhanced inverter module, which is typically connected to a power grid. Enhanced inverters are controllable either locally or remotely, wherein system status is readily determined, and operation of one or more sections of the system are readily controlled. The system provides increased operation time, and increased power production and efficiency, over a wide range of operating conditions.
Owner:SOLAREDGE TECH LTD
Inverter control methodology for distributed generation sources connected to a utility grid
InactiveUS7248946B2Improvement in MPPTEasy to controlMechanical power/torque controlLevel controlIslandingMppt algorithm
Owner:ADVANCED ENERGY CONVERSION
Automatic, Highly Reliable, Fully Redundant Electronic Circuit Breaker That Reduces or Prevents Short-Circuit Overcurrent
A programmable power (PPSE) switching element including a front power transistor, a main switching transistor, and at least one reverse current blocking transistor in series, a gate of each of which is connected to a gate driver; an inductor and a shunt resistor connected in series with the transistors; a charge storage capacitor connected between ground and a junction located between the inductor and the shunt resistor; a high-speed NPN transistor, a collector of which is connected to the front power transistor and an emitter of which is connected to an output of the main switching transistor via the shunt resistor; a current measurement element in parallel to the shunt resistor; a voltage amplifier; and a high-speed MCU.
Owner:REDLER TECH LTD
Fault Detection Mechanism for LED Backlighting
ActiveUS20070159750A1Static indicating devicesElectroluminescent light sourcesFault indicatorVoltage drop
A fault detection mechanism for a LED string comprising a plurality of serially connected LEDs, the fault detection mechanism comprising: a control circuitry; and a voltage measuring means, in communication with the control circuitry, arranged to measure the voltage drop across at least one LED of the LED string, the control circuitry being operable to: measure the voltage drop, via the voltage measuring means, at a plurality of times, compare at least two of the measured voltage drops, and in the event the comparison of the at least two voltage drops is indicative of one of a short circuit LED and an open circuit LED, output a fault indicator.
Owner:POLARIS POWERLED TECH LLC
Power converting apparatus, control method therefor, and solar power generation apparatus
InactiveUS7079406B2Short timePower supply linesSingle network parallel feeding arrangementsElectrical batteryTransverter
The object is to reliably detect a ground fault of a solar battery. To detect a ground fault position to take an efficient measure against the ground fault, DC power input from a solar battery is converted into AC power and supplied to a system. In a system interconnection inverter (utility connected inverter) having non-insulated input and output, the input voltage of a converter circuit and / or the intermediate voltage between the converter circuit and an inverter circuit are varied to control the potential to ground at each portion of the solar battery to a value other than a value close to zero.
Owner:CANON KK
Power line coupling device and method
InactiveUS7876174B2Multiple-port networksElectric signal transmission systemsElectrical conductorElectric power distribution
A power line coupler for communicating data signals between a communication device and a power distribution system having one or more overhead energized medium voltage power line conductors is provided. One embodiment comprises a first lightening arrestor having a first end and a second end, wherein the first end of the first lightening arrestor is configured to be connected to the first power line conductor and the second end of the first lightening arrestor is configured to be communicatively coupled to a first terminal of the communication device. The embodiment further includes a second lightening arrestor having a first end and a second end and wherein the first end of the second lightening arrestor is configured to be connected to a second power line conductor, and the second end of the second lightening arrestor is configured to be communicatively coupled to a second terminal of the communication device.
Owner:SUBAUDITION WIRELESS
Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults
ActiveUS20110141644A1Emergency protective arrangement detailsArrangements responsive to excess currentCurrent sensorPeak current
A direct current arc fault circuit interrupter includes separable contacts and a trip circuit to trip open the contacts. The trip circuit includes a number of alternating current sensors structured to sense a current flowing through the separable contacts, a number of filter circuits cooperating with the AC current sensors to output a number of AC signals, a number of peak detectors cooperating with the filter circuits to output a number of peak current signals, and a processor cooperating with at least the peak detectors. The processor inputs the number of peak current signals as a plurality of peak current signals or inputs the number of peak current signals and determines the plurality of peak current signals. The processor also determines if the peak current signals exceed corresponding predetermined thresholds for a predetermined time, and responsively causes the contacts to trip open.
Owner:EATON INTELLIGENT POWER LTD
Systems and methods for distributed series compensation of power lines using passive devices
ActiveUS7835128B2Emergency protective arrangements for limiting excess voltage/currentReactive power compensationElectrical conductorTransformer
Systems and methods for implementing line overload control via providing distributed series impedance are disclosed. One system, amongst others, comprises at least one distributed series reactor (DSR). Each DSR comprises a single turn transformer (SST) comprising two split-core sections (132), a winding (120), and an air-gap (138), the air-gap designed such that a magnetizing inductance is produced when the two split-core sections (132) are clamped around a conductor (108). Each DSR further comprises a contact switch (122) that short circuits the winding when the contact switch (122) is in a closed condition, a power supply (128) that derives power from conductor line current, and a controller (130) configured to open the contact switch when the conductor line current reaches a predetermined value, thus causing insertion of the magnetizing inductance into the conductor. The controller (130) may be further configured to close the contact switch (122) when the conductor line current drops below the predetermined value.
Owner:GEORGIA TECH RES CORP
Bypass discharge path for a power sourcing equipment
InactiveUS7281141B2Overcome disadvantagesAvoid dischargeMechanical power/torque controlDc network circuit arrangementsElectricityPower flow
A method for preventing an excess voltage from appearing at an output of a power over Ethernet controller, the method comprising: sensing that a powered device has been disconnected from a port; enabling a bypass path around a means for unidirectional current flow operatively connected to the port; and disconnecting power to the port responsive to the sensed disconnect, whereby the bypass path enables a discharge path for an output capacitor present across the port. The invention also provides for a circuit having a bypass path around a means for unidirectional current flow, the bypass path being enabled by a control circuit to prevent an excess voltage from appearing at a sensing input of the control circuit. In an exemplary embodiment the bypass path is enabled approximately simultaneously with disconnecting power from the output port.
Owner:NEVERMORE SOLUTIONS
Snubber circuit for a power converter
InactiveUS7385833B2Easy to controlHigh voltageEfficient power electronics conversionDc-dc conversionTransverterEngineering
Owner:ASTEC INT LTD
Overvoltage sensing and correction circuitry and method for low dropout voltage regulator
InactiveUS6201375B1Reduce severityEmergency protective arrangements for limiting excess voltage/currentArrangements responsive to excess voltageOvervoltageElectrical conductor
Owner:BURR-BROWN CORPORATION
System and method for ground fault detection and interruption
InactiveUS20090190275A1Accurate operationSafely and effectively decoupleDc network circuit arrangementsBoards/switchyards circuit arrangementsAC powerInterrupter
A ground fault detector and interrupter for a photovoltaic (PV) energy conversion system, method and apparatus are disclosed. In an exemplary embodiment, the system includes first and second inputs adapted to couple to a first and second rails of a PV array. An inverter is configured to convert DC power generated from the PV array to AC power. A ground fault detector and interrupter, which is coupled to the first and second rails and to the inverter, is configured to detect ground fault conditions in the PV array and to decouple the PV array from the remaining portion of the PV energy conversion system upon such detection. A known signal is coupled to the input of the ground fault detector and interrupter, and then sensed at the output of the ground fault detector and interrupter to determine whether components of the ground fault detector and interrupter are operating properly.
Owner:AES GLOBAL HLDG PTE LTD
Safety electrical outlet with logic control circuit
InactiveUS20020097546A1Batteries circuit arrangementsBoards/switchyards circuit arrangementsControl circuitElectric power
An electrical safety outlet for accepting a plug to provide power to electrical appliances including a power supply and an intelligent circuitry for controlling the power supply to the electrical outlet; the intelligent circuitry includes circuits for determining temperature condition in the outlet, mechanical plug insertion into the outlet, load presence on the outlet, and current capacity conditions.
Owner:BLACKBIRD TECH
Method and apparatus for aggregating power from multiple sources
ActiveUS7259474B2Large line resistanceLimit maximum power drainedBatteries circuit arrangementsSingle network parallel feeding arrangementsVoltage converterLine resistance
A method and apparatus for aggregating power from multiple sources generates a single direct current regulated voltage. The apparatus comprises a plurality of slave voltage converters and a master pulse width modulator circuit. Providing a plurality of direct current power sources, current is drawn through a plurality of lines connected to the plurality of direct current power sources. An open circuit voltage for each direct current power source is unknown. Each line of the plurality of lines has a line resistance. The line resistance of at least some of the plurality of lines may be unknown. The line resistance of at least some of the plurality of lines is large. The single direct current regulated voltage is generated from the drawn current.
Owner:F POSZAT HU
Self-powered current monitor
A self-powered current monitor for monitoring current in electric power systems. Various data relating to input currents may be displayed, such as current magnitude, current demand, and harmonics levels. Operating power is derived from one or more of the input currents. The power supply configuration may include a burden-reducing means to reduce the burden on input current sources during sampling of the input currents. The self-powered current monitor (1) includes a power supply section (3), input resistors (R1 and R3), an analog-to-digital converter circuit (5), a microprocessor circuit (6), a memory circuit (9), and a display circuit (7). Optional features include a burden-reducing circuit (2), input circuit protective elements (D1, D2, D3, D4, R2, and R4), an amplifier circuit (4), a user interface circuit (10), and an interface circuit (8) for communication to other equipment.
Owner:EDEL THOMAS G
Inductive quench for magnet protection
ActiveUS7701677B2Effective heat conductionMagnetic measurementsMagnetsSuperconducting CoilsInternal energy
A coil system for inductively heating a superconducting magnet in order to provide an internal energy dump by uniformly quenching a high performance superconducting magnet. The quench-inducing system uses AC magnetic fields that require negligible reactive power. The system is especially suited for inducing a relatively uniform quench in dry superconducting magnets.
Owner:MASSACHUSETTS INST OF TECH
Method and apparatus for detection and control of dc arc faults
ActiveUS20110019444A1Testing dielectric strengthPhotovoltaic monitoringReliability engineeringElectric arc
A method and apparatus for managing DC arc faults. At least a portion of the method is performed by a controller comprising at least one processor. In one embodiment, the method comprises analyzing a signature of a signal of a power converter and determining, based on analysis of the signature, whether an arc fault exists.
Owner:ENPHASE ENERGY
Uninterruptible power supply
InactiveUS20050036248A1Extended storage timeImprove power densityBatteries circuit arrangementsPolyphase network asymmetry elimination/reductionEngineeringAC power
An uninterruptible power supply (UPS) system includes an AC power input configured to receive AC power from a single-phase AC power source or a multi-phase AC power source, a DC power source, an output circuit including a power output, a controllable switch configured to selectively couple at least one of the AC power input and the DC power source to the output circuit, and a processor coupled and configured to affect operation of the output circuit depending upon which of single-phase and multi- phase operation of the UPS is indicated.
Owner:AMERICA POWER CONVERSION CORP
Device for non-dissipative measurement of the current in an inductor
ActiveUS20070075711A1The equipment is easy to operateHigh precisionResistance/reactance/impedenceElectrical measurement instrument detailsMeasurement deviceInductor
The invention relates to a device for measuring current in an inductor, which device is intended to be connected in parallel with said inductor, comprising two terminals A and B. The device comprises: a network in parallel with the inductor and connected to the terminals A and B having a resistor R2 in series with a resistor R1 in parallel with a capacitor C1; a voltage offset circuit having a DC voltage generator E connected in parallel with an offset resistor (Roffset) in series with two resistors in parallel R3 and R4, the positive pole of this voltage source being connected to terminal B of the inductor; a temperature compensation circuit comprising a current source controlled as a function of the temperature, one of the two terminals of the current source being connected to the negative pole of the generator E, the other terminal of the current source being connected to different points of the measurement device according to the direction of variation of the current of the source as a function of the temperature. The measurement of voltage Vmes, the image of the current I in the inductor 12, is performed between the common point between the resistors R1, R2 of the network and the common point between the offset resistor and the two resistors R3 and R4.
Owner:THALES SA
Rack level power management
InactiveUS20060082222A1Reduce power consumptionServersLoad balancing in dc networkEngineeringPower budget
A system for rack level power management, the system comprising: at least one power source; a management module; and a plurality of power managed modules in communication with the management module and connected to draw power from the at least one power source, each of the plurality of power managed modules comprising a power manager and an operating circuit, the operating circuit being operable at a plurality of power drawing levels responsive to the power manager, the management module being operative to allocate a power budget to each of the plurality of power managed modules and communicate the allocated power budgets to the power managers, each of the power managers being operative to control the operating circuit of the power managed module to be operable at a power drawing level within the allocated budget.
Owner:NEVERMORE SOLUTIONS
Electrostatic discharge protection device for liquid crystal display using a COG package
InactiveUS6043971AEmergency protective arrangements for limiting excess voltage/currentNon-linear opticsEngineeringElectrostatic discharge protection
The electrostatic discharge (ESD) protection device for a liquid crystal display using a chip on glass (COG) package is provided. The ESD protection device includes a plurality of gate lines and data lines each of which has an output pad at its end. A plurality of gate line input pads and data line input pads are formed opposite to the output pads of the gate lines and data lines, respectively. A common electrode is formed between the plurality of gate line input pads and output pads and between the data line input pads and output pads. A plurality of electrostatic discharge protection circuits are connected between the input pads and the common electrodes to protect the input pads from electrostatic discharge.
Owner:LG DISPLAY CO LTD
Battery pack for cordless power tools
InactiveUS20080238370A1Avoid damageCharge equalisation circuitCircuit monitoring/indicationEngineeringPower tool
A battery pack which includes a battery pack electronic control circuit adapted to control an attached power tool and / or an attached charger. The battery pack includes additional protection circuits, methodologies and devices to protect against fault conditions within the pack, as the pack is operatively attached to and providing power to the power tool, and / or as the pack is operatively attached to and being charged by the charger.
Owner:BLACK & DECKER INC
Disk drive comprising depletion mode MOSFETs for protecting a head from electrostatic discharge
InactiveUS7009820B1ESD protectionTransistorSemiconductor/solid-state device detailsMOSFETEngineering
A disk drive is disclosed comprising a disk and a head actuated over the disk. The head comprising a first head terminal and a second head terminal. The disk drive further comprises an electrostatic discharge (ESD) protection circuit comprising a first depletion mode metal oxide semiconductor field effect transistor (MOSFET) and a second depletion mode MOSFET. A first transistor terminal of the depletion mode MOSFETs are coupled to respective head terminals, and a second transistor terminal of the depletion mode MOSFETs are coupled to ground. The gate terminals of the first and second depletion mode MOSFETs are biased to turn on the depletion mode MOSFETs while the disk drive is powered down, thereby grounding the first and second head terminals to protect the head from ESD.
Owner:WESTERN DIGITAL TECH INC
Reset lockout mechanism and independent trip mechanism for center latch circuit interrupting device
InactiveUS6671145B2Circuit-breaking switches for excess currentsSwitch operated by earth fault currentsLockout MechanismEmbedded system
Resettable circuit interrupting devices, such as GFCI devices, that include a reset lockout mechanism, an independent trip mechanism and reverse wiring protection. A conical reset plunger is notched to force a successful test before reset.
Owner:LEVITON MFG
Disk drive comprising depletion mode MOSFET for protecting a head from electrostatic discharge
InactiveUS7046488B1ESD protectionTransistorSemiconductor/solid-state device detailsMOSFETField-effect transistor
A disk drive is disclosed comprising a disk and a head actuated over the disk. The head comprising a first head terminal and a second head terminal. The disk drive further comprises an electrostatic discharge (ESD) protection circuit comprising a first depletion mode metal oxide semiconductor field effect transistor (MOSFET) comprising a gate terminal and a first and second transistor terminals. The first transistor terminal of the first depletion mode MOSFET is coupled to the first head terminal, and the second transistor terminal of the first depletion mode MOSFET is coupled to the second head terminal. The gate terminal is biased to turn on the first depletion mode MOSFET while the disk drive is powered down, thereby shorting the first and second head terminals to protect the head from ESD.
Owner:WESTERN DIGITAL TECH INC
System, device and method for providing voltage regulation to a microelectronic device
InactiveUS6965502B2High speed signal settlingAct quicklyPower supply for data processingArrangements responsive to excess currentEngineeringSteady state
The present invention provides a power regulation system and method with high speed signal settling capabilities for providing rapid active transient response to a microelectronic device. An active transient response system includes a power supply configured to receive external and / or internal signals indicating the occurrence of transient load conditions and to respond to the transient load conditions based on one or more of these signals. The system may further include a transient suppressor configured for early detection of transients, assisting in transient suppression, and early signaling of transient activity to the power supply.The system provides rapid recovery to steady state operation from the active transient response mode by using a digital compensator to quickly modifying the duty cycle and provide a voltage offset proportional to the transient microprocessor load step. Recovery is further improved by current rephasing techniques.
Owner:INFINEON TECH AUSTRIA AG
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