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542 results about "Phase lead" patented technology

The phase lead is given by the tend of the switching line. The sinusoidal vertical-axis rotation test showed normal gains, a phase lead at 0. If the neutral is at an elevated voltage, such as a phase lead of a 3-phase input, the oscilloscope becomes a live circuit, and contact will result in a shocking test experience.

Multiple power source system and apparatus, motor driving apparatus, and hybrid vehicle with multiple power source system mounted thereon

In a multiple power source system of the present invention that has an inverter connected to a reactance, such as three-phase coils in a motor, a high voltage battery is connected with a low voltage battery via one transistor (Tr2) and one diode (D2) included in the inverter and one phase coil (U-phase coil) of the three-phase motor. The transistor Tr2 is turned on to make the electric current flow from the low voltage battery to the U-phase coil. The transistor Tr2 is subsequently turned off at a preset timing, so that the electric energy accumulated in the reactance, that is, the U-phase coil, flows through the diode D1 into the high voltage battery and thereby charges the high voltage battery. This arrangement enables the charging process from the low voltage battery to the high voltage battery without any complicated circuit structure for the voltage step-up. The three-phase motor may be unipolar driven with transistors connected to one side of the inverter. The arrangement of the present invention does not require any complicated structure, which undesirably increases the size of the multiple power source system, in order to ensure mutual supplement of the electric energy between electric systems having a large difference in voltage, for example, an electric system for driving a hybrid vehicle and an electric system for its control circuit.
Owner:TOYOTA JIDOSHA KK

Direct Current Brushless Machine and Wind Turbine System

A direct current brushless electric machine is described that comprises a sequence of permanent magnets where the N and S magnetic poles being alternately arranged adjacent to each other, each exerting a magnetic field; phase coils are composed of a group of conductors, each conductor being laid essentially in parallel with each other, each coil being displaced by a full range of a single magnetic pole of the permanent magnet, such that each phase coil is alternately disposed adjacent to each other; and magnetic field or every other coil is in the same orientation to form an armature positioned opposite to the permanent magnet movable with respect to the armature with a predetermined amount of air gap provided between the phase coils and the permanent magnets. The electric machine operates as a generator when the power is flowing from a prime mover, such as the turbine blade extracting energy from the wind or water. The electric machine operates as a motor when the current is applied to the coils in a sequence to move the rotor when the turbine blades move the wind or water.
Also described is an aerodynamic system comprising inner and outer annulus disposed driving fans, with a pressure differential flow enhancing aerodynamic housing, able to concentrate and make laminar rough and turbulent intake air molecule flows, creating a smooth rotationally organized downstream vortex field, with maximum power extraction from building structure directed velocity flow enhancements.
Owner:GEDDRY MARY +1

Distribution network ground fault arc suppression method based on three-phase cascade H bridge converters

The invention relates to a distribution network ground fault arc suppression method based on three-phase cascade H bridge converters. The three-phase cascade H bridge converters are adopted to replace arc suppression coils and mounted between phase lines and the ground, and power is supplied to capacitors on the direct current side of the converters by using phase voltages, so that boosting transformers and grounding transformers are saved, and the problem of source taking difficulty on the direct current side of the converters is solved. The converters inject current to a distribution network in a phase splitting mode to compensate the total current of a ground fault to be zero or to inhibit the phase voltage of the fault to be zero, so that the arc is automatically extinguished; and the reference compensation current is calculated by using real-time measured zero sequence voltage, so that the fault phase identification link is saved. The operation is simplified by using the voltage arc suppression method of controlling the zero sequence voltage to adjust the injected compensation current. In view of the influence of circuit parameters and load current on the arc suppression effect and the deduced relation between the ground fault residual current after the voltage arc suppression method is applied and the zero sequence voltage after the fault, an adaptive arc suppression method is put forward by using the zero sequence voltage as a voltage and current arc suppression method.
Owner:SHANGHAI HOLYSTAR INFORMATION TECH

Calibration method and system for electric energy meter

The invention is suitable for the electric instrument field and provides a calibration method and system for electric energy meter, wherein, the method includes the following steps: a calibration control desk transmits basic calibration command frame to a calibrated electric energy meter to complete calibrating initialization of the meter; moreover, the basic calibration command frame carries the initialization parameters and the phase line value of the calibrated electric energy meter; when the initialization of the calibrated electric energy meter is completed, the calibration control desk which controls the output of a power source according to calibration steps reads the calibration parameters generated by a standard electric energy meter according to the output of the power source and transmits calibration command frame to the calibrated electric energy meter; moreover, the calibration command frame carries the calibration parameters and calibration step mark; finally, the calibrated electric energy meter completes calibrating operation according to the calibration parameters and the calibration step mark carried by the calibration command frame, the calibrated parameter calculation error compensation coefficient generated according to the output of the power source. The invention increases the reliability and the accuracy in electric energy meter calibration.
Owner:SHENZHEN CLOU ELECTRONICS

Bidirectional polyphase multimode converter including boost and buck-boost modes

A charging method using a multiphase line voltage for charging an energy storage system (ESS) using a polyphase motor drive circuit communicated to a polyphase motor, the polyphase motor drive circuit including a plurality M of driver stages, one driver stage for each phase of the polyphase motor with each driver stage coupled across the energy storage system, the method including the steps of: (a) determining a charge mode responsive to a comparison of the multiphase line voltage to a voltage of the energy storage system, the determined charge mode including a boost mode when the voltage of the energy storage system has a first predetermined relationship to the multiphase line voltage and the determined charge mode including a boost-buck mode when the voltage of the energy storage system has a second predetermined relationship to the multiphase line voltage; (b) converting, when the charge mode includes the boost mode, the multiphase line voltage to a first charging voltage using a first set of N number of the plurality of driver stages, with N less than M, wherein the first charging voltage is communicated to the energy storage system, and wherein the first charging voltage is greater than the multiphase line voltage; and (c) converting, when the charge mode includes the boost-buck mode, the multiphase line voltage to a second charging voltage using a second set of P number of the plurality of driver stages when in the boost-buck mode, with P greater than N, wherein the second charging voltage is communicated to the energy storage system, and wherein the second charging voltage is less than the multiphase line voltage.
Owner:TESLA INC

Full-speed position-less sensor technology for aviation starting power generation system

The invention discloses a full-speed position-less sensor technology for an aviation starting power generation system based on coaxial running of a permanent magnet motor and a starting generator. A main motor is coaxially connected with the permanent magnet motor when serving as the starting generator, the permanent magnet motor is not connected into the system and is in no-load power generation running when the system is started, and counter potential is not easily interfered. After the number of poles of stators and rotors of the permanent magnet motor and the starting generator is determined, the positional relation among the stators and the rotors of the starting generator and the permanent magnet motor which are coaxially connected is determined according to relations among positional change of a stator and a rotor of a simulation permanent magnet motor and various phase line potentials and the 0-degree mechanical angle position of the starting generator, the initial position of the starting generator is judged according to injection pulse, the motor is started by a current response method, and a phase change point of the starting generator is determined by detecting a zero crossing point of a reference phase line potential of the permanent magnet motor when the rotating speed reaches a threshold value. The technology overcomes the shortcomings that magnetic property detection is easily interfered and the like when the starting generator electrically runs, and the technology is a simple and convenient full-speed position-less control strategy.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Clock recovery and detection of rapid phase transients

Systems and methods are described for clock recovery and detection of rapid phase transients. An apparatus includes: a numerically controlled oscillator; a phase detector coupled to the numerically controlled oscillator; and a multiplexer coupled to the phase detector and the numerically controlled oscillator, wherein a) the phase detector sets a state variable indicator to either i) a high value if an output phase of the numerically controlled oscillator lags an incoming signal phase, or ii) a low value if the output phase leads the incoming signal phase, b) the multiplexer sends either i) a high increment to the numerically controlled oscillator if the state variable indicator has been set to the high value, or ii) a low increment to the numerically controlled oscillator if the state variable indicator has been set to the low value, and c) the numerically controlled oscillator either i) advances the output phase if the high increment has been sent to the numerically controlled oscillator, or ii) retards the output phase if the low increment has been sent to the numerically controlled oscillator. A method includes incrementing a high counter once every clock cycle if a state variable indicator is high; clearing a low counter if the state variable indicator is high; incrementing the low counter once every clock cycle if the state variable indicator is low; clearing the high counter if the state variable indicator is low; and triggering an alarm signal if either i) the low counter exceeds a low count threshold or ii) the high counter exceeds a high count threshold.
Owner:MICROSEMI FREQUENCY & TIME

Method for trapping CO2 by using double tube micro-reactor

ActiveCN102019129ALarge amount of processingEnhanced cross-flow contact reactionProductsReagentsMicron scaleMicroreactor
The invention relates to a method for trapping carbon dioxide (CO2) by using a double tube micro-reactor. The method comprises the following steps of: introducing CO2-containing mixed gas into an inner tube of the micro-reactor, wherein the pressure intensity at a gas inlet is 0.1 to 5MPa and the gas-phase linear velocity is 1.0 to 20.0m/s; injecting absorption liquid into an outer tube of the micro-reactor and keeping liquid-phase linear velocity within a range of between 0.01 and 1m/s to form a stable annular liquid membrane; allowing the gas to burst out from a micro-channel of the inner tube, dispersing the gas phase into micron-scale small bubbles and allowing the small bubble to collide the liquid membrane which has micron-scale thickness and is formed in the outer tube on a microporous part of the micro-reactor by cross flow; and allowing the gas and the liquid to flow into the annular micro-channel of the micro-reactor in parallel to finish a micro mass transfer absorption process. The method can greatly enhance the gas-liquid mass transfer process of which the reaction is controlled by the liquid membrane, and obviously improve the CO2 absorption rate; and the processing load is increased by scores of times compared with that of a single-channel micro-reactor. The method has a simple process and is low in cost.
Owner:BEIJING UNIV OF CHEM TECH
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