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547 results about "Self excited" patented technology
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Definition of self-excited. : excited by a current produced by the generator itself self-excited generators.
Noncontact Electric Power Transmission System
ActiveUS20100219696A1Improve transmission efficiencyShorten design timeElectromagnetic wave systemTransformersElectric power transmissionTransmitter coil
Disclosed is a noncontact electric power transmission system having a power transmitter circuit section 10 and a power receiver circuit section 30 which are adapted to be coupled to transmit electric power from a transmitter coil Lp provided in the power transmitter circuit section 10 to a receiver coil Ls provided in the power receiver circuit section 30, in a noncontact manner by means of electromagnetic induction. The noncontact electric power transmission system comprises: a separately-excited or self-excited switching circuit 2 provided in the power transmitter circuit section 10; a control IC 3 operable to drive the switching circuit 2; an LC series resonant circuit including a capacitor Cp connected in series to the transmitter coil Lp or an LC parallel resonant circuit including a capacitor Cp connected in parallel to the transmitter coil Lp; and an LC parallel resonant circuit including a capacitor Cs connected in parallel to the receiver coil Ls, wherein an oscillating frequency (Fosc) of the control IC 3, a resonant frequency (Fpr) of the LC series resonant circuit or the LC parallel resonant circuit in the power transmitter circuit section 10, and a resonant frequency (Fsr) of the LC parallel resonant circuit in the power receiver circuit section 30, have the following relationship: Fpr<Fosc<Fsr.
Owner:MURATA MFG CO LTD
Hybrid electric vehicle
ActiveUS20140244082A1Wide constant power rangeLow costHybrid vehiclesAC motor controlCapacitanceExternal combustion engine
A hybrid electric vehicle includes a high voltage DC bus and an internal combustion engine. The internal combustion engine is mechanically coupled to a non self-excited generator / motor which is preferably a switched reluctance machine. A power inverter electrically and bidirectionally couples the high voltage DC bus to the non self-excited switched reluctance generator / motor. Front and rear axle dual DC-AC inverters electrically and bidirectionally couple two traction AC non self-excited switched reluctance motors / gear reducers to the high voltage DC bus for moving the vehicle and for regenerating power. An ultracapacitor coupled to the high voltage DC bus. A bidirectional DC-DC converter interposed between a low voltage battery and the high voltage DC bus transfers energy to the high voltage DC bus and ultracapacitor to ensure that the non self-excited switched reluctance generator / motor operating in the motor mode is able to start the engine.
Owner:FAIRFIELD MFG CO INC
Damping force adjustable shock absorber
ActiveUS20090242339A1Avoid response delaysImprove responsivenessSpringsShock absorbersInternal pressureSelf excited
An object of the present invention is to provide a damping force adjustable hydraulic shock absorber, in which response delay of a pressure control valve and self-excited vibration of a valve body can be prevented. A damping force is generated by controlling an oil flow between an annular oil passage 21 and a reservoir 4 generated by a sliding movement of a piston in a cylinder with use of a back-pressure type main valve 27 and a pressure control valve 28. The damping force is directly generated by the pressure control valve 28, and a valve-opening pressure of the main valve 27 is adjusted by adjusting an inner pressure of a back-pressure chamber 53. In the pressure control valve 28, a valve spring 57 is disposed between a valve body 56 and a plunger 34. A mass of the valve body 56 is sufficiently less than that of a plunger 34, and a spring stiffness of the valve spring 57 is higher than that of a plunger spring 36. As a result, it is possible to improve the responsiveness of the valve body 56 to prevent response delay in a damping force control. In addition, since the natural frequency of the valve body 56 is high, it is possible to prevent self-excited vibration of the valve body 56.
Owner:HITACHI ASTEMO LTD
Impedance-matched vibration massager
A hand-held massager capable of self-excited, impedance-matched vibration for optimal massaging of each particular body part of each particular individual. The massager includes a hollow, open-ended contact piece to which is coupled a vibrator and which is to be held against a desired body part. A pressure sensor is mounted to the contact piece for sensing pressure variations in the cavity in the contact piece while the open end thereof is held against the body part, in order to ascertain the mechanical impedance of that body part. A closed-loop, electropneumatic vibration control system makes it possible for the mechanical impedance to be fed back to the vibrator, causing the latter to make self-induced vibration. Thus the desired body part is optimally massaged at its resonance frequency.
Owner:M I LABIRIES
Optical reflection element
ActiveUS20110292479A1Improve detection accuracyImprove accuracyMirrorsPiezoelectric/electrostriction/magnetostriction machinesOptical reflectionSelf excited
An optical reflection element includes a mirror portion and an oscillator coupled to the mirror portion. The oscillator includes a base, an insulating layer, a drive element, and a monitor element. The insulating layer is formed on the base. The drive element and the monitor element are formed on the insulating layer, and are separated from each other by a separation groove. Each of the drive element and the monitor element includes a lower electrode layer, a piezoelectric layer, and an upper electrode layer formed in that order on the insulating layer. The monitor element has high detection accuracy, allowing the optical reflection element to perform self-excited driving with high accuracy.
Owner:PANASONIC CORP
Semiconductor integrated circuit
InactiveUS20050081076A1Sufficient supplyLow costPulse automatic controlVolume/mass flow measurementSelf excitedEngineering
A semiconductor integrated circuit is provided with an external interface circuit, which includes a clock generation circuit for generating a synchronous clock signal to establish synchronization between data input and output through input and output of a data string sectioned at fixed intervals. The clock generation circuit includes a self-excited oscillator circuit serving as an oscillation source for the synchronous clock signal, and a control circuit for trimming the oscillation frequency of the self-excited oscillator circuit. The control circuit detects the sections made at the fixed intervals to the data string, measures the section interval based on an oscillation output of the self-excited oscillator circuit, and controls the oscillation frequency of the self-excited oscillator circuit to match the measurement value to a target value. With such a structure, any required frequency can be oscillated in a self-excited manner using a data string sectioned at fixed intervals using SOF packets or others instead of an oscillator.
Owner:RENESAS TECH CORP
Self-excited vibration heat pipe and computer with the heat pipe
InactiveUS20050180109A1Few troubleImprove heat transfer performanceDigital data processing detailsIndirect heat exchangersSelf excitedPliability
The present invention is to provide a heat pipe which is high in heat transfer performance and reliability and can be low priced, compact and lightweight, and has flexibility, and a computer provided with the heat pipe. At least a part of a conduit (1) constituting a container of a self-excited oscillation heat pipe is formed in a shape having flexibility such as a waved bent shape. Alternatively, at least a part of the container of the self-excited oscillation heat pipe is formed of a material having flexibility such as super elastic alloys.
Owner:MIYAZAKI YOSHIRO +1
Damping force adjustment type buffer
InactiveCN101550981AImprove responsivenessRaise the natural frequencySpringsLiquid based dampersSelf excitedEngineering
The invention relates to a damping force adjustment type buffer, capable of preventing the response delay of a pressure control valve and the self-excited vibration of the valve. The buffer controls the flow of the oil liquor between a ring oil line (21) and an oil storage chamber (4) generated by the slide of an inner piston of a hydraulic cylinder by a back pressure main valve (27) and a pressure control valve (28) to generate damping force. The direct damping force is generated by the pressure control valve (28) and the inner pressure of a back pressure chamber (53) is adjusted to control the valve opening pressure of the main valve 927). A valve spring (57) is mounted between a valve (56) and a plunger (34) in the pressure control valve (28) and the weight of the valve (56) is fully less than the weight of the plunger (34) and the spring rigid of the valve spring (57) is higher than the spring rigid of the plunger spring (36). Thus the response of the valve (56) is increased and the response delay of the damping force control is prevented. In addition, the natural frequency of the valve (56) is increased therefore the generation of the self-excited vibration is prevented.
Owner:HITACHI LTD
Self-excited resonance drilling device and drilling method thereof
InactiveCN102287137AReduce failureExtended service lifeVibration devicesVibration drillingSelf excitedWell drilling
The invention relates to a self-excitation sympathetic vibration well drilling device and method, wherein the self-excitation sympathetic vibration well drilling device comprises an upper drill rod, a drill collar, a shock absorber, an upper short connection part, a self-excitation resonator, a lower short connection part and a drill head from top to bottom. The drill collar is connected with theupper drill rod through threads. The shock absorber is connected with the drill collar through threads. The upper short connection part is connected with the shock absorber through threads. The self-excitation resonator is connected with the upper short connection part through threads. The other end of the self-excitation resonator is connected to the lower short connection part. The drill head is connected to the lower short connection part via threads. The invention is capable of making full use of lengthways vibration of the drill post, changing the harm into benefit, reducing the loss efficacy of the drill post effectively and enhancing the service life of the drill post. On the other hand, the invention is capable of converting the mechanical energy in lengthways impact and vibrationgenerated by the drill head and the drill collar to medium kinetic energy, achieving the rock crack sympathetic vibration condition and enhancing the well drilling speed.
Owner:NORTHEAST GASOLINEEUM UNIV
Simulation method of wind-induced disaster whole process of long-span bridge
ActiveCN103218481AColumnar is simple and intuitiveHigh precisionSpecial data processing applicationsElement modelSelf excited
The invention provides a simulation method of a wind-induced disaster whole process of a long-span bridge. The simulation method comprises the steps of making the aerostatic coefficients, an effective instant wind attack angle and the relative wind speed integrally working on an aerodynamic force of a main beam, and then carrying out unsteady correction on self-excited force components in the aerostatic coefficients, the effective instant wind attack angle and the relative wind speed; applying aerodynamic force load to a finite element model for carrying out dynamic-history calculation, and carrying out iteration of torsion base frequency and vertical-curve base frequency in different wind speeds; and judging the steady state of a bridge structure under a certain wind speed according to displacement response. According to the simulation method provided by the invention, the integrated calculation of calm-wind instability, buffering and flutter is realized, the defect of independent calculation in traditional wind vibration calculation is overcome, and the accuracy of bridge wind vibration calculation is increased.
Owner:SOUTHEAST UNIV
System and method for distributed optical fibre sensing measurement based on Brillouin scattering
InactiveCN102798411AHigh measurement accuracyLow costMeasurement devicesFrequency spectrumSelf excited
The invention discloses a system and a method for distributed optical fibre sensing measurement based on Brillouin scattering. According to the invention, the laser of the system outputs two continuous laser lights having a wavelength difference of greater than 15 nm, and the laser lights are split into a detection light and a local oscillation light via a wave combiner and a coupler; the detection light enters sensing optical fibres via an electro-optical modulator and a circulator which are connected with a pulse signal generator, and a self-excited Brillouin scattering light is accessed into the 3 dB coupler via the circulator; and the local oscillation light is accessed into the 3 dB coupler as well, and the output of the 3 dB coupler is connected with a balance detector and a data acquisition and processing unit which stores associated programs and formulas. The measurement method comprises the following steps that: the double-wavelength detection light is modulated into a detection light pulse so as to generate self-excited Brillouin scattering in the sensing optical fibres, and subjected to coherent frequency mixing with the local oscillation light; the data acquisition and processing unit performs a frequency-sweep measurement on the difference-frequency electric signal of the balance detector so as to obtain Brillouin scattering frequency spectrums and Brillouin frequency shifts along different points of the optical fibres, and calculates to obtain the change amounts of a temperature and a strain. Via the system and the method disclosed by the invention, simultaneous measurement for the temperature and the strain is realized, and the measurement accuracy is improved.
Owner:GUANGXI NORMAL UNIV
Double-rotor disc self-excited retarder and control method thereof
InactiveCN101934738AIncrease profitImprove cooling effectElectrodynamic brake systemsElectric machinesSelf excitedDrive shaft
The invention discloses a double-rotor disc self-excited retarder and a control method thereof. The retarder, a generating set and two rotor discs are fixedly arranged on a transmission shaft of an automobile, wherein the two rotor discs are arranged on both sides of the retarder; the retarder comprises a retarder coil, a retarder coil iron core and a retarder bracket; the generating set comprises a permanent magnet, a generating set stator coil and a generating set shell; a control unit comprises an amplifying circuit, a voltage transformation rectifier and two relays; the transmission shaft of the automobile rotates to drive the permanent magnet to rotate; a three-phase alternating voltage generated by the generating set stator coil is input into the voltage transformation rectifier; a brake signal is input into the amplifying circuit, so that a normally open contact of a first relay is closed; the current of a storage battery is input into a second relay through the normally open contact of the first relay; the second relay switches on the retarder coil; and an electromagnetic braking torque generated by the rotor disc prevents the transmission shaft of the automobile from rotating. The retarder has the advantages of power generating and retarding functions, high system radiating performance and higher braking efficiency and chassis space utilization ratio.
Owner:JIANGSU UNIV
A liquid-cooled self-exciting eddy current retarder with brushless structure
InactiveCN102299608ABrake releaseCompact structureVehicular energy storageCooling/ventillation arrangementSelf excitedMagnetic poles
The invention provides a liquid cooling auto-excitation-type eddy current retarder without an electric brush structure and belongs to an auxiliary braking device for retarding a vehicle. The eddy current retarder provided by the invention comprises a retarder rotor, a retarder stator, a control module and a generator device, wherein the retarder rotor consists of a retarder coil, an electromagnetcore and a core retainer; the retarder coil is wound on a coil frame, and the electromagnet core is inserted into the coil frame; the electromagnet core, the retarder coil and the coil frame are uniformly distributed on the circumference of the core retainer; the retarder rotor is connected with a transmission shaft, and the inner circle of the retarder stator and the excircle of the electromagnetic core of the retarder rotor are coaxial; and the generator device comprises a generator exciting winding, a generator excitation magnetic pole, a generator armature winding and a generator armaturecore and positioned in the retarder rotor. Compared with the traditional eddy current retarder, the eddy current retarder provided by the invention has the advantages of better safety, high reliability, no need of maintenance, compact overall structure, small volume and weight, and easiness for realization of intelligent control on the brake torque and constant-speed cruising of the retarder.
Owner:YANGZHOU ANXING ELECTROMECHANICAL TECH
Measuring method and device for twisting property of flexible material
InactiveCN1587969AEffective torsional performance measurementAccurate torsional performance measurementMaterial analysis by optical meansStrength propertiesSelf excitedEngineering
The invention is a torsion property measuring method and apparatus for flexible material. The method is that upper end of simple holds to measure torsion moment and lower end hangs a weight to be revolved to a certain torsion moment or torsion angle then released to rotate back and reciprocate naturally, measuring autooscillation property and torsion modulus of the sample; or lower end is holded to have forced rotation or positive and negative, measuring once of the sample. The apparatus is consisted of moving beam, force, displacement sensor, torsion moment measuring mechanism, upper and lower holder, rotation mechanism, micro polarized light optical circuit and camera mechanism, moving and focusing mechanism, temperature cap, driving system and control circuit, program control and signal processing system, finishing measurement of self excited vibration, torsional fatigue and relaxation performance of flexible material with stationary load or stretch and observing degree of twist transfer of sample in and property change under different temperature, having simple but practical structure, convenient installation, many measurable parameters and accurate measurement.
Owner:DONGHUA UNIV
Switching Control Circuit and Self-Excited DC-DC Converter
ActiveUS20060290333A1Lower Level RequirementsEfficient power electronics conversionDc-dc conversionDc dc converterSelf excited
Owner:SEMICON COMPONENTS IND LLC +1
A self-excited push-pull converter
ActiveCN102299616AEasy to makeSimple production processAc-dc conversionDc-dc conversionSelf excitedPush pull
The invention discloses a self-excited push-pull type converter which comprises a Royer circuit. An inductor connects a power supply terminal of the Royer circuit with a center tap of a transformer primary winding in the Royer circuit. An inductance value of the inductor is less than one-tenth of an inductance value of a primary winding in the transformer. The center tap of the primary winding isa connection point of two primary windings of the transformer. The self-excited push-pull type converter of the present invention has the characteristics of high consistency, easy debugging, low technology requirement, and good short circuit protection performance.
Owner:MORNSUN GUANGZHOU SCI & TECH
Two-stage hybrid excitation brushless synchronous motor
ActiveCN102195427AFully self-motivatedSolve the excitation problemSynchronous machinesGenerator control by field variationSynchronous motorSelf excited
Owner:山东智贤电器设备有限公司
Multi-phase DC-DC converter and control circuit for multi-phase DC-DC converter
ActiveUS20060164050A1Improve load responsivenessPoor responsivenessDc-dc conversionElectric variable regulationDc dc converterControl signal
A self-excited multi-phase DC-DC converter having satisfactory responsiveness when its load suddenly changes. A control unit of the converter compares output currents of first and second converter units. Based on the comparison result, the control unit generates control signals to operate a converter unit through which a smaller output current flows. For example, when an output voltage of the converter decreases due to a sudden change in the load while the first converter unit is operating to supply current, the second converter unit through which a smaller output current flows is operated to increase the output voltage.
Owner:CYPRESS SEMICON CORP
Hybrid electric vehicle
ActiveUS9174525B2Wide constant power rangeLow costHybrid vehiclesAC motor controlElectrical batterySelf excited
A hybrid electric vehicle includes a high voltage DC bus and an internal combustion engine. The internal combustion engine is mechanically coupled to a non self-excited generator / motor which is preferably a switched reluctance machine. A power inverter electrically and bidirectionally couples the high voltage DC bus to the non self-excited switched reluctance generator / motor. Front and rear axle dual DC-AC inverters electrically and bidirectionally couple two traction AC non self-excited switched reluctance motors / gear reducers to the high voltage DC bus for moving the vehicle and for regenerating power. An ultracapacitor coupled to the high voltage DC bus. A bidirectional DC-DC converter interposed between a low voltage battery and the high voltage DC bus transfers energy to the high voltage DC bus and ultracapacitor to ensure that the non self-excited switched reluctance generator / motor operating in the motor mode is able to start the engine.
Owner:FAIRFIELD MFG CO INC
Telescopic double-edged deep-hole boring cutter
The invention provides a telescopic double-edged deep-hole boring cutter, aims to provide a deep-hole drilling boring cutter which has large length-diameter ratio, small self-excited vibration of a boring bar, reliable and stable feeding operation, no radial motion of a cutter arbor, and radial feeding of a cutting edge in a cutting process, and solves the problem that the deep-hole bottle cavity with large length-diameter ratio has large processing difficulty. The boring cutter comprises the boring bar which can extend to the deep-hole bottle cavity, wherein the central axis of the boring bar is provided with a through hole which runs through the central axis; a push rod (2) which is connected with a radial feeding device of the head of the boring bar is arranged in the through hole; the rear end of the push rod (2) is provided with a rotating handle; the rotating handle rotates a screw (5) and pushes the push rod (2) to do radial telescopic motion in the through hole of the boring bar; and the push rod (2) moves by way of pushing or pulling to drive the radial feeding device connected with the push rod and adjust the cutting edge of the double-edged boring cutter on a cutter block (3) to radically feed in the deep-hole bottle cavity.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP +1
Gyro sensor of an electrostatic driving and capacitance detecting type
InactiveUS7322237B2Acceleration measurement using interia forcesSpeed measurement using gyroscopic effectsCapacitanceGyroscope
A gyro sensor having a vibrator and a start circuit generates an oscillation encouraging signal by boosting a first voltage to a voltage of the signal in response to a start signal of a start frequency sent from the start circuit. The vibrator is vibrated in response to the oscillation encouraging signal. When the vibrator is self-excited, the vibrator outputs a first detecting signal indicating an oscillating amplitude and oscillating frequency in the vibration of the vibrator. The sensor boosts the first voltage to a second voltage in response to the first detecting signal and generates a driving signal of a driving frequency and the second voltage. The self-excitation of the vibrator is continued in response to the driving signal. The vibrator outputs a second detecting signal indicating a yaw added to the vibrator. The sensor generates a sensor signal corresponding to the yaw from the second detecting signal.
Owner:DENSO CORP
Self-excited atomic magnetic sensor for liquid crystal phase compensation and magnetic field measurement method
ActiveCN109188316AQuick responseAvoid phase shiftMagnetic field measurement using magneto-optic devicesSelf excitedClosed loop
The invention discloses a self-excited atomic magnetic sensor for liquid crystal phase compensation and a magnetic field measurement method, which are used for a magnetometer. The self-excited atomicmagnetic sensor comprises a pumping light path perpendicular to the direction of the magnetic field, a probe light path along the direction of the magnetic field, and a circuit closed loop. The pumping light path sequentially comprises an atomic air chamber, a first polarizer, an acousto-optic modulator, and a laser. The probe light path sequentially comprises a photoelectric detector, an atomic air chamber in the pumping light path, a second wave plate1 / 4, a liquid crystal, a first wave plate1 / 4, a second polarizer, and a laser. The closed loop portion of the circuit comprises a photoelectricdetector, an amplifying comparator, a power driver, an acousto-optic modulator, and a counter. According to the liquid crystal phase compensation scheme, a phase shift caused by a circuit coil can beavoided, a phase shift of a larger range magnetic field can be achieved, and the problem that the circuit is unfavorable in the phase shift is solved by combining a light intensity modulation magnetometer and a self-excited magnetometer, the response speed is high, the liquid crystal phase compensation scheme is suitable for the various atomics, and the application value is high.
Owner:PEKING UNIV
Variable face width gearing
InactiveUS6230578B1Reduce variationReduce componentsPortable liftingGearing elementsGeometric propertyGear drive
A form of gearing having teeth with different face widths along the tooth height and a method thereof of designing and manufacturing. Different gear tooth face widths are introduced along the tooth height to alter the tooth stiffness characteristic to provide a pair of gears with reduced mesh stiffness variation. The use of variable face widths along the tooth height changes both the geometric properties of the tooth and the load distribution / concentration to reduce the self-excited component of dynamic load, in effect reducing gear noise and increasing power density.
Owner:AXICON TECH
Vehicular annuniciation device and method for notifying proximity of vehicle
ActiveUS20120092185A1Improve installabilityReduce in quantityAcoustic signal devicesRoad vehicles traffic controlElectricitySelf excited
An electromagnetic alarm device includes a current interrupter to interrupt an electricity supply to a coil on application of a self-excited voltage to oscillate a diaphragm with a moving core to generate a first alarm sound including a fundamental tone at a first predetermined frequency, when a switch is manipulated by an occupant. A proximity notification device includes an ultrasonic speaker to emit an ultrasonic wave, which is generated by implementing ultrasonic modulation on a proximity notification sound, to an outside of the vehicle for notifying a pedestrian of proximity of the vehicle, according to a traveling state of the vehicle and / or when a sensor detects a pedestrian. The ultrasonic speaker emits an ultrasonic wave, which is generated by implementing ultrasonic modulation on a second alarm sound including a fundamental tone at a second frequency, when the switch is manipulated.
Owner:DENSO ELECTRONICS CORP
Multi-frequency band self-excited interference elimination repeater
InactiveCN101583210AReduce the number of inputsReduced isolation requirementsRadio relay systemsWireless communicationInterference eliminationCommunications system
The invention is applicable to the communication field and can carry out relay amplification on a wireless communication system with various frequency bands and simultaneously eliminate self-excited interference of signals. The repeater comprises a downlink which is composed of a multi-frequency band branching / combining unit, a downlink power amplification module and multi-frequency band branching / combining units which are sequentially connected, and an uplink which is composed of a multi-frequency band branching / combining unit, an uplink power amplification module and multi-frequency band branching / combining units which are sequentially connected. The repeater system can process wireless signals with multiple frequency bands, thereby being capable of containing a plurality of downlinks and a plurality of uplinks. The downlink power amplification module and the uplink power amplification module in the embodiment of the invention are both provided with self-excited interference elimination modules, thereby being capable of eliminating the self-excited interference of the repeater. The multi-frequency band self-excited interference elimination repeater can reduce the number of equipments which are used for the repeater and installed by mobile communication operators and increase the wireless coverage range.
Owner:深圳市信特科技有限公司
Transient electromagnetic splay transmitting and receiving coil
InactiveCN101853730AEfficient receptionEasy to useElectric/magnetic detectionCoils manufactureSelf excitedEngineering
The invention relates to a transient electromagnetic splay transmitting and receiving coil, which is characterized in that on the basis of conventional independent frame-shaped transmitting and receiving coils, the transmitting coil and the receiving coil are respectively twisted for 180 degrees from middle parts and then are transformed into two splay coils. The invention achieves the purpose of eliminating external interference of electromagnetic waves in the early process of signal acquisition by geometrical splay transmitting and receiving coils. The coil eliminates the interference of electromagnetic waves and simultaneously ensures that self-excited electromagnetic waves can be effectively received; and the coil is relatively convenient in use and is suitable for practical work of a transient electromagnetic method.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
Electric power steering system
ActiveUS20140180544A1Occurrence of can suppressedSteering initiationsDigital data processing detailsElectric power steeringElectric power system
When a steering speed reaches a steering speed determination threshold, a steering speed gain is set to “0”. As a result, a final basic assist controlled variable becomes “0”, and application of an assist force to a steering system is stopped. Therefore, repetition of so-called reverse assist that is a cause of occurrence of an unintended steering behavior, such as self-excited vibration, is stopped. Accordingly, the steering behavior is improved.
Owner:JTEKT CORP
Over-power protection apparatus for self-excited power converter
ActiveUS7116565B1Duty cycle of the upper and lower transistor is reducedEmergency protective circuit arrangementsAc-dc conversionSelf excitedSwitching signal
An over-power protection apparatus for self-excited power converter comprises a soft-start unit, an adjusting unit and a timing unit. A PWM unit of the self-excited power converter generates a switching signal in response to a compensating signal of the soft-start unit to control the output power of the self-excited power converter. The soft-start unit couples to the adjusting unit. The adjusting unit drives the soft-start unit and the PWM unit for modulating the switching signal to reduce the pulse width of the switching signal and the output power of the self-excited power converter once the short-circuit and over-load are happened at the output of the self-excited power converter. In the meantime, a timing unit starts to count. The timing unit drives the self-excited power converter to stop supplying the power source after the counting and the over-power lasting for a period of time.
Owner:SEMICON COMPONENTS IND LLC
Multi-mesh gear system
InactiveUS20030109355A1Increase sound powerIncrease in complexityToothed gearingsPortable liftingGear wheelSelf excited
Disclosed herein is a multi-mesh gear system, such as an epicyclic gear system, in which (a) optimal performance is not load-specific and (b) the same profile modifications can be applied on both flanks of the common gear. This is accomplished through a novel combination of a constant system contact ratio and gearing having mesh stiffness variation reducing, or MSVR, modifications. An MSVR modification, such as Differential Crowning, will minimize the self-excited component of dynamic load for gear meshes across different operating loads, resulting in an optimized gearset. The specification of a substantially constant contact ratio for the multi-mesh gear system allows the same MSVR modification to be used on both tooth flanks of the common gear, reducing the cost and complexity of manufacture.
Owner:AXICON TECH
Multi-phase DC-DC converter and control circuit for multi-phase DC-DC converter
A self-excited multi-phase DC—DC converter having satisfactory responsiveness when its load suddenly changes. A control unit of the converter compares output currents of first and second converter units. Based on the comparison result, the control unit generates control signals to operate a converter unit through which a smaller output current flows. For example, when an output voltage of the converter decreases due to a sudden change in the load while the first converter unit is operating to supply current, the second converter unit through which a smaller output current flows is operated to increase the output voltage.
Owner:CYPRESS SEMICON CORP
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