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1230 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

Bidirectional VSC converter with a resonant circuit

The invention relates to a VSC-converter for converting direct voltage into auxiliary voltage and vice versa, which comprises a series connection of at least two current valves (5, 6) arranged between two poles (7, 8), a positive and a negative, of a direct voltage side of the converter, each current valve comprising several series connected circuits (12), each of which circuits comprising a semiconductor component (13) of turn-off type and a rectifying component (14) connected in anti-parallel therewith, an alternating voltage phase line (16) being connected to a midpoint (15), denominated phase output, of the series connection of current valves (5, 6) between two of said current valves while dividing the series connection into two equal parts. Each of the series connected circuits (12) of the respective current valve comprises, in order to make possible a good voltage distribution between the semiconductor components (13) of turn-off type included in the respective current valve, a snubber capacitor (17) connected in parallel with the semiconductor component (13) of turn-off type included in the circuit. The converter (1) further comprises a resonance circuit (18) for recharging the snubber capacitors (17) of the current valves.
Owner:ABB (SCHWEIZ) AG

Three-phase power input phase lack detection circuit

The invention relates to an input lack-phase detection circuit of a three-phase power supply, comprising a first current-limiting resistor, a second current-limiting resistor and a third current-limiting resistor which are respectively connected to a first phase line, a second phase line and a third phase line, the input lack-phase detection circuit also comprises a pull-up resistor, a third diode with a cathode which is connected to the third current-limiting resistor, a first optocoupler and a second optocoupler with output ends which are connected in series between the pull-up resistor and signal ground, a first diode which is connected with an input end of the first optocoupler in series between the first current-limiting resistor and an anode of the third diode, a second diode which is connected with the input end of the second optocoupler in series between the second current-limiting resistor and the anode of the third diode, a first capacitor which is connected with the input end of the first optocoupler in parallel and a second capacitor which is connected with the input end of the second optocoupler in parallel, and the pull-up resistor is connected to the output end of the lack-phase detection circuit. The input lack-phase detection circuit reduces the loss on the current-limiting resistors, so the current-limiting resistors are difficult to damage due to small heat, the reliability of the circuit is improved and the service life is prolonged.
Owner:SHENZHEN INOVANCE 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
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