432 results about "Ampere" patented technology

A surgical system and associated method for sealing the passageway of a fluid-carrying vessel with a diameter up to 5 millimeters comprises an electrosurgical generator capable of delivering electrosurgical power, a surgical instrument electrically connected to the electrosurgical generator and adapted to transfer electrosurgical power from the electrosurgical generator to a pair of end effectors disposed at a distal end of the surgical instrument. The system also includes a power control circuit for controlling the delivery of radio frequency energy to the vessel through the end effectors, wherein the delivery of the radio frequency energy to the vessel comprises, raising the output current to a range below 1.75 Amperes RMS and the output voltage to a range below 135 Volts RMS. Radio frequency energy is applied to the vessel for a period of time while the power is held approximately constant. The flow of radio frequency energy is terminated when the impedance of the vessel being sealed reaches a predetermined level.

A method of repairing a combustion turbine component having damage located at or near a cooling hole or hollow or geometrically complex portion of the component is provided. The method comprises forming a preparatory groove that extends from a surface of the component to the damaged area but does not extend to the cooling hole or hollow or geometrically complex portion of the component, the groove extending 40-90% the distance from the component to the damaged area; spraying a filler material into the groove with a micro-plasma torch at a current of less than 50 amperes; and filling the groove with the filler material such that the heated filler material substantially extends from the cooling hole or hollow or geometrically complex portion of the component to a surface of the component.

An apparatus (40) and method for switching a customer-premises telephone line (36) between a plurality of local telephone networks (35). The local telephone networks may have different electrical and operational characteristics. Using less than 100 micro-amperes of current from the telephone networks, the apparatus (40) requires no external power and performs its tasks without interfering with the normal operation of the telephone networks including test equipment, terminal equipment, data transmission on the telephone line and test equipment. The method involves monitoring electrical signals on both local telephone networks (35) and using this information to assign a weight to each network. The customer-premises telephone line (36) is switched to the telephone network having the highest weight. The advantages are the elimination of a service call by a technician to manually switch the customer premises telephone line (36), equal access by both service providers to the switch and a seamless interface to the telephone networks.

The invention discloses an electromagnetic push-pull Braille touch screen which comprises contacts with the number being the multiple of 6. Each six contacts are arranged in three rows and two lines so as to form a Braille unit; all the Braille units are assembled to compose the Braille touch screen; each contact comprises a base frame, a return spring, a coil, a permanent magnet, an iron core and a coil lead; one end of the return spring is connected to the bottom of the permanent magnet, and the other end of the return spring is fixed on the base frame; the coil and the iron core compose an electromagnet which is fixed at the bottom of the base frame; the coil lead is connected with an external control circuit for supplying power for the coil; and the top of the permanent magnet is hemispherical. The touch screen utilizes the electricity-to-magnetism principle, the Ampere's rule and the phenomenon that magnets with the same poles reprehend each other, and realizes the rising and reset of the contact through the thrust and pull generated by the permanent magnet and the electromagnet. The touch screen is in line with the formation rule of Braille and the using habits of blind persons, is simple in structure principle and easy to realize, and can realize the fast generating and updating of the Braille through being externally controlled by a common chip.

A method of repairing a combustion turbine component having damage located at or near a cooling hole or hollow or geometrically complex portion of the component is provided. The method comprises forming a preparatory groove that extends from a surface of the component to the damaged area but does not extend to the cooling hole or hollow or geometrically complex portion of the component, the groove extending 40–90% the distance from the component to the damaged area; spraying a filler material into the groove with a micro-plasma torch at a current of less than 50 amperes; and filling the groove with the filler material such that the heated filler material substantially extends from the cooling hole or hollow or geometrically complex portion of the component to a surface of the component.

An energy monitoring and management system and method are provided herein. The system and method centralize load metering by utilizing at least one sensor for observing load characteristics (e.g., Volts, Amperes, Watts, active energy . . . ) communicatively coupled via a backplane to a waveform analyzer component of a control component. The waveform analyzer component generates metered data values after receiving input from the at least one sensor. Subsequently and if so desired, the control component can send a control signal to the load to alter the state of the load or simply reduce the power to a load. Such input, output, and processing functionality, according to an aspect of the present invention, are employed using a backplane to facilitate high-speed communication among components and to allow metered data to be centrally stored, manipulated, analyzed or communicated to other components or sub-components.

The invention discloses a permanent magnet synchronous motor maximum torque per ampere control method based on parameter self-correction. Real-time estimation is carried out on change condition of motor parameters (permanent magnet flux linkage, d-axis inductance and q-axis inductance) through utilization of a feedforward compensation control module; further online correction is carried out on themotor parameters in a torque equation; an electromagnetic torque model comprising accurate motor parameter information is obtained; a torque to current angle change rate is directly solved through utilization of the model; further an MTPA (Maximum Torque Per Ampere) angle is computed; and precise maximum torque per ampere control is realized. When motor operation condition is changed, according to the method, the MTPA angle can be directly solved through mathematical operation, so influence of system bandwidths does not need to be taken into consideration; an algorithm simple; computing speedis fast; dynamic performance is relatively good; a motor is enabled to work at the maximum torque per ampere operation point all the time; influence of the operation condition and motor parameter change is avoided; and relatively good parameter robustness and dynamic response characteristic are achieved.

The invention discloses a control method of a maximum torque per ampere vector control system for a position sensor-free internal permanent magnet synchronous motor, and belongs to the field of motor control. The problems of complexity of a computing method and low accuracy of an obtained current set value in the conventional maximum torque per ampere control strategy are solved. The control system comprises a permanent magnet synchronous motor, an inverter, a space vector pulse width modulation unit, a three-phase-two-phase coordinate conversion unit, a static-rotational coordinate conversion unit, a Fourier analysis unit, a vector angle regulation unit, a rotating speed regulator, a maximum torque per ampere control unit, a first current regulator, a second current regulator, a rotational-static coordinate conversion unit and a rotor position and rotating speed observer. According to the control method, the magnitude of current amplitude is automatically regulated and compared on the basis of a current vector angle gamma, and an operating point with maximum torque per ampere is automatically searched. The system and the method are applied to maximum torque per ampere vector control over the motor.

The invention relates to technology for preparing graphene, in particular to a method for massively preparing high-quality graphene with excellent electrical conductivity and good thermal stability. The method comprises the following steps of: rapidly heating in an arc discharge mode under pressure atmosphere by adopting a cathode and an anode, expanding and splitting oxidized graphite to prepare exfoliated graphite, wherein the anode is the oxidized graphite prepared by a Hummer method, the total pressure of buffer gas is 50 to 1,000 torr and the discharging current is 50 to 300 amperes; uniformly dispersing the exfoliated graphite in solution of surfactant by adopting an ultrasonic method; and removing graphite which is not exfoliated completely and large-dimension thick graphite sheets by adopting a high-speed centrifugal method so as to prepare the high-quality graphene with excellent electrical conductivity and good thermal stability. The high-quality graphene with excellent electrical conductivity and good thermal stability can be prepared by simply controlling technological parameters, and the method has the characteristics of low cost, high product yield and mass production.

The invention discloses a gas-shielded welding method for high-strength bridge steel, which comprises the following steps: (1) the high-strength bridge steel with the tensile strength of between 570 and 650MPa and the thickness of 50 millimeters is adopted, a matched welding material is adopted, wherein the tensile strength of a welding wire is between 570 and 660MPa, and the diameter of the welding wire is 1.2 millimeters; (2) a gas-shielded welding groove adopts a double V-shaped symmetrical groove, the angle of the groove is 60 DEG, and the truncated edge is 2 millimeters; (3) the welding process specification is as follows: the welding current is between 250 and 270 amperes, the welding voltage is between 23 and 27 volts, the welding speed is between 30 and 29 centmeters / minute, the welding heat input is between 12 and 15kJ / cm, the argon-rich mixed gas metal arc welding with 20 percent of CO2 and 80 percent of Ar is adopted, the flow of gas is between 18 and 20 liters / minute, no preheating is performed before welding, and no heat treatment is performed after the welding; and (4) the gas-shielded welding adopts multi-layer multi-passage continuous welding, and the interlayer temperature is controlled to between 100 and 150 DEG C. The welding method has the advantages of good welding processing property, simple and convenient operation, applicability, convenience, high efficiency, and energy conservation, and is applicable to the manufacturing, promotion and application of large-span bridge steel of factories.

An LD-Driver with a back termination circuit is disclosed. The back termination circuit of the invention provides a transistor as an active device, a current source to provide a bias current to the transistor, and a resistor as a passive element that couples the transmission lines carrying a differential signal thereon. Because the transistor shows a differential resistance of several tens of ohms by providing only a few milli-amperes, the output impedance of the LD-Driver may be substantially matched with the characteristic impedance of the transmission line with lesser additional power consumption.

The present invention is directed to a method and system for improving motor efficiency. The motor of the present invention may provide at least 1.9 Horsepower (HP) while drawing 15–16 Amperes at 120 Volts. The motor of the present invention may provide at least 75% efficiency and the speed of 12,000 to 14,000 RPM. A small size and low weight motor may be provided by the present invention. Further, it is contemplated that the motor of the present invention may be produced at a low cost per unit with a volume of 500,000 to 1,000,000 units per year. It is also contemplated that the motor may be suitable for use in consumer and professional products by complying with recognized safety standards such as U.L., CSA, CEE and the like.

A vehicle testing apparatus and method which facilitates tracing and isolating of short circuits. The tester preferably provides a user-selected constant current level (i.e. 1, 3 and 6 amperes) for driving a vehicle short under test at a constant current level compatible with the circuit. Any significant changes in the conductance of the vehicle short under test are registered in response to circuit voltage changes. An annunciator is activated in response to sudden significant conductance changes (preferably conductance decreases) which exceed a threshold level. Annunciation (preferably including audio output) allows the operator to immediately correlate movements of specific regions of wiring, or other circuit elements, with changes in the detected short conductance for the shorted circuit being tested. By way of example and not of limitation the tester may be implemented inexpensively with low cost analog circuitry, and does not require incorporating a microcontroller.

An energy monitoring and management system and method are provided herein. The system and method centralize load metering by utilizing at least one sensor for observing load characteristics (e.g., Volts, Amperes, Watts, active energy . . . ) communicatively coupled via a backplane to a waveform analyzer component of a control component. The waveform analyzer component generates metered data values after receiving input from the at least one sensor. Subsequently and if so desired, the control component can send a control signal to the load to alter the state of the load or simply reduce the power to a load. Such input, output, and processing functionality, according to an aspect of the present invention, are employed using a backplane to facilitate high-speed communication among components and to allow metered data to be centrally stored, manipulated, analyzed or communicated to other components or sub-components.

The invention provides a power-driven plant pruning machine. The power-driven plant pruning machine is composed of the following interconnected components: a direct-current motor, a jagged circular blade, a battery, a motor fixing shell, a battery fixing shell, a power line, a power switch and a handle, wherein the battery with a voltage of 12 volts and capacity of 20 amperes supplies power for the power-driven plant pruning machine and drives the direct-current motor with rate voltage of 12 volts and rated power of 450 watts; the motor rotating at a high speed drives the jagged circular blade arranged on the exposed motor axle to spin at a high speed, and the blade cuts plants off as soon as the blade touches the plants; the power switch of the machine is installed above the front of the handle, and the power line passes through the hollow cavity of the handle and is separately connected with the motor and the battery; the handle, the motor shell and the battery shell are made of high-strength plastic materials, and a protecting cover is made of stainless steel sheet; and a charging jack is arranged in the lower part of the outer side of the battery shell and used for connection of an external charger for charging of the battery. The power-driven plant pruning machine has the advantages of small size, light weight, simple structure, convenient operation, high work efficiency, good pruning quality, conservation of effort and labor and wide application range.

Circuit flaws in microelectronic circuitry present regions of high resistance in which a current distribution deviates from that of a defect-free circuit. The altered current distribution emits a correspondingly altered magnetic field in accordance with Ampere's Law. When compared with the magnetic field of a defect-free circuit, the anomaly in the magnetic field of the defective device is detected and the location of the circuit flaw may be determined therefrom. As the anomaly in the magnetic field is very small in magnitude, a sensitive magnetic microscope is utilized to obtain images of the magnetic fields of a defect-free reference device and a device-under-test. The distance between the magnetic sensor and the devices being scanned is precisely controlled to minimize influences of scanning distance on the difference in measured magnetic field strength. Comparative image analysis reveals the location of the circuit flaw. Maximal image registration through image interpolation, displacement and resampling optimizes the comparative image analysis.

A method and apparatus for determining the cold cranking ampere (CCA) value of a battery under test in which an algorithm of battery CCA as a function of battery internal resistance (IR) is provided, the IR of the battery under test is measured, and the measured IR determines the CCA value of the battery under test from the algorithm. The method and apparatus are used either in a vehicle in which the battery is installed or on a stand alone basis.

A wire cleaner for removing impurities from the surface of an elongated welding wire as the wire travels along a given path, the wire cleaner comprises a tunnel with a tube having a central passage surrounding the path with a gap between the tube and the wire moving through the tube, a power supply with first and second output terminals across which is generated an AC output current having a frequency in the range of about 100-300 kHz and a magnitude of at least about 1.0 amperes, a first connector attaching the first output terminal to the tube and a second terminal attaching the second output terminal to the moving wire whereby current proportional to the output current flows along the surface and across the gap to heat the wire to cause evaporation of the surface impurities. As an alternative, induction heating of the wire is used.

Process to use water, methyl alcohol, and baking soda to make hydrogen and oxygen to increase fuel mileage on gasoline, diesel and LP gas engines using the process generally known as “Electrolysis” with many modifications. A device and method for producing hydrogen and oxygen gases from Water Solutions and simultaneously using the gases produced to supplement fuels used to operate the vehicle or engine. The solution used in the Electrolytic container is water and sodium bicarbonate [baking soda]. The hydrogen and oxygen-producing device is powered by as many as 5,500 amperes [DC or AC], generator or alternator, using the vehicle engine alternator or generator to produce the current to power the electrolytic cell. The electrolytic container is kept at a constant solution level. The water solution temperature may be controlled by either a low-pressure air conditioning line, a water-cooling line with a thermostatic control valve, on-off temperature control switch or water-cooling fins. The electrolytic cell is equipped with means to control the energy load, water level, gas flow and presenting the hydrogen and oxygen into the combustion chamber of the vehicle and or the engine.

A lighting method for a high pressure discharge lamp in which a high-pressure pulse is applied to cause a dielectric breakdown, and then in step S1, it is judged whether the lamp voltage is higher than 25 volts as the current switching voltage. If it is judged negatively in step S1, the control circuit 304 performs a constant current control with the current limiting level set to 6 amperes (step S2). If it is judged that the lamp voltage is higher than 25 in step S1, the control circuit 304 performs a constant current control with the current limiting level set to 4 amperes (step S3). When the lamp voltage rises and reaches 50 volts, the control circuit 304 performs a constant power control so that the lamp power remains to be 200W.

The invention provides an anode oxidation method which comprises the following steps: under the anode oxidation condition, putting light metal material in electrolyte, using the light metal material as an anode, using the conducting material which does not react with the electrolyte as a cathode, and enabling the cathode and the anode to be respectively electrically connected with a positive electrode and a negative electrode of a power source. The anode oxidation comprises constant current density anode oxidation and constant voltage anode oxidation, wherein the current density of the constant current density anode oxidation is 0.5 to 6 amperes / square decimeter, and the voltage of the constant voltage anode oxidation is 20 to 400 volts. Compared with the light metal material which is processed by the prior anode oxidation method, the corrosion resistance of the light metal material which is processed by the anode oxidation method of the invention is greatly improved, and even the light metal material which is processed by the anode oxidation method of the invention is not post-processed by plugging, the corrosion resistance of the light metal material is also stronger.

In a computerized device requiring a relatively large amount of power during operation (e.g., between approximately 10 kW to 15 kW) at a relatively large current (e.g., between approximately 200 and 300 amperes), an electrical conductor or power distribution assembly having a substantially flat, planar geometry electrically couples a power supply, via bus bars, to a midplane of the computerized device. The substantially flat planar geometry of the power distribution assembly minimizes conduction and radiation of electromagnetic interference (EMI) by the electrical conductor during operation of the computerized device.

A DC TIG welder operable at a set low current level under about 5 amperes in a welding circuit including an electrode separated from a workpiece by a gap, the welder having an output welding current adjustable above the low current and driven by a constant current power supply with a first rectifier having an output current controlled by the firing phase of SCRs in an SCR network, a second rectifier settable at the low current and a sensor for sensing arc voltage. The welder further comprises: a circuit to deactivate the SCRs when the output welding current is equal to or less than the set low current and an arc starting device to cause the first rectifier to output a high pulse by operation of the SCRs of the network.

The micro-amp immunity sensor based on mixed self-assembly film comprises: a silicon substrate, a SiO2 and Si3N4 insulation layer, and the concentric circular gold film electrode, SU-8 photoresist ring sensitive film pond, a ring Pt-film counter electrode / reference electrode, a Su-8 photoresist ring reaction pond, and a bio-molecular sensitive film fixed on the electrode. With nano technology and mixed self-assembly film, this invention has well consistence, correlativity and compatibility with IC, and shows a new path for immunity analysis and detection.

An exemplary lens driving apparatus includes a first retaining frame having first retaining portions, first coils of wire received in the first retaining portions, and a voice coil motor movably received in the first retaining frame. The voice coil motor includes a second retaining frame having second retaining portions, magnets received in the second retaining portions, and a core member having a second coil of wire wound around and being movably received in the second frame. The core member receives lens therein. The magnets generate magnetic fields which are capable of driving the core member to move along the lens optical axis when the second coil of wire is electrically powered; the magnets are applied reverse force of Ampere's force when the first coils of wire are electrically powered, such that the voice coil motor together with the lens is moved in a plane perpendicular to the lens optical axis.

The invention discloses a superconducting stack soldering method for a high-temperature superconducting current lead wire and a mold thereof; superconducting tapes to be soldered and soldering ribbons are alternately arranged in a mold cavity which is made of metal materials with good thermal conductivity; a mold core and a counterweight are pressed on the superconducting tapes, the mold is heated to the soldering temperature under the vacuum condition, the temperature is kept for 10-15 minutes, and then the mold is rapidly cooled to the solidification point of soldering filler metals to complete the soldering. The critical current of the low-heat conductivity high-temperature superconducting tapes under a 77K self-field is only 100-120A which is much less than the thousands to tens of thousands of amperes of operating current of a large superconducting magnet, so that the superconducting tapes can be used by soldering into a stack. The price of the bismuth-based superconducting tape which takes Ag-5.3wt% Au alloy as a substrate is 5-6 times than the price of the ordinary bismuth-based superconducting tape; while the offer of a superconducting stack of foreign high-temperature superconducting companies is almost doubled again. The method and the mold for soldering the superconducting stack can ensure that the current carrying performance is not deteriorated, the longitudinal heat leakage is not increased, the soldering among the superconducting tapes is uniform and the requirements on the resistance performance in a low layer can be met.

The invention comprises an inverter / converter yielding high frequency harmonics and / or non-sixty Hertz output coupled to a high frequency inductor-capacitor filter apparatus. For example, an inverter / converter apparatus is provided that uses a silicon carbide transistor to output power having a carrier frequency modulated by a fundamental frequency and a set of harmonic frequencies, where the minimum carrier frequency is above that usable by an iron-steel inductor, such as greater than ten kiloHertz at fifty or more amperes. An inductor-capacitor filter, comprising an inductor having a distributed gap core material, receives power output from the inverter / converter and processes the power by passing the fundamental frequency while reducing amplitude of the harmonic frequencies.