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| Number | Title | Issue Date |
| 7612552 | Electrical phase checking apparatus and method of metering An electrical phase checking apparatus includes a first voltage sensor, a first current sensor, a first binary indicator corresponding to the first voltage and current sensors, a second voltage sensor, a second current sensor, and a second binary indicator correspon... | 11/03/2009 |
| 7339365 | Phase detector and method of phase detection In order to provide a phase detector and a method of phase detection which are distinguished by greater sensitivity and simple implementability, at least one differential signal of two input signals (Ua; Ub) may be formed over at least one pred... | 03/04/2008 |
| 7337083 | Process for identification of the direction of rotation of two periodic electrical signals at the same frequency A process and apparatus for identification of the direction of rotation of two periodic electrical signals present on two electrical conductors, particularly of a three-phase power system. In this process, the signals are sampled from two conductors by two wires of ... | 02/26/2008 |
| 7323968 | Cross-phase adapter for powerline communications (PLC) network An adapter to reduce the effects of cross phase communication between a PLC transmitter plugged into one of the L1 or L2 power lines of a home and a PLC receiver plugged into the opposite L2 or L1 power line includes a housing with one si... | 01/29/2008 |
| 7242110 | Control system for canceling load unbalance of three-phase circuit A control system for canceling load unbalance of a three-phase circuit includes phase current detectors for detecting phase currents caused to flow through a secondary circuit of a current transformer provided in high voltage distribution lines, respectively, phase ... | 07/10/2007 |
| 7221140 | Circuit, method and system for providing one or more phase voltages from input voltages The present invention provides a phase voltage circuit. In one embodiment, the phase voltage circuit includes a line voltage stage coupled to at least three input voltage lines and configured to provide at least two corresponding line voltages. Additionally, the pha... | 05/22/2007 |
| 7205756 | Unbalanced current detection An unbalanced current detection circuit determines when a multi-phase, normally-balanced load is unbalanced. The detection circuit of the present invention includes a plurality of current-squaring circuits, each squaring a sensed current of one of the phases. A summ... | 04/17/2007 |
| 7193337 | System and method utilizing a solid state power controller (SSPC) for controlling an electrical load of a variable frequency three-phase power source A solid state power controller (SSPC) (100) includes a power switching controller (30) and power switching devices (PSDs) (20A, 20B, 20C) for controlling each phase of a multiple-phase load to switch-on or -off at a zero-crossing p... | 03/20/2007 |
| 7183761 | Rotation sensor In a rotation sensor including a rotor 10 mounted to a rotating shaft S and having a conductive sensing unit 12 whereof the width varies in the circumferential direction; and stationary cores 31, 32, 41, 42 each including an exciting coil for fo... | 02/27/2007 |
| 7149615 | Absolute steering angle detection device and absolute steering angle detection method for electric power steering device A steering angle θt detected by the torque sensor is read at S900. Then, an electrical angle θm corresponding to a motor rotational angle is read at S902. At S908 through S922, motor rotational numbers are calculated based on θt, θm a... | 12/12/2006 |
| 7141960 | Method and device system for testing electrical components The method is for testing an electrical component. The sender unit 12 may be applied to an electrical plug 24 that has a first line 28, a second line 32 and a ground line 36. It is determined which of the lines 28, 32, 36 th... | 11/28/2006 |
| 7112895 | Reduced power consumption in integrated circuits with fuse controlled redundant circuits System and method for reducing power consumption in integrated circuits (IC) with fuse controlled redundant circuits. A preferred embodiment comprises detecting the status of fuses within the IC, disabling input signals to redundant circuits if none of the fuses hav... | 09/26/2006 |
| 7088232 | System and method for reducing radiation when distributing broadband communication signals over power lines A system for decreasing high frequency (HF) radiation emission in a power line comprises a first transmitter configured to transmit a utility power signal over the power line. A second transmitter transmits a high frequency communication signal over the power line s... | 08/08/2006 |
| 7081760 | Method of diagnosing a broken bar fault in an induction motor A method for diagnosing induction motor broken bar faults using the resultant magnetic field pendulous oscillation phenomenon is disclosed. Broken bar faults cause the resultant magnetic field of an induction motor to possess a pendulous oscillation modulating its i... | 07/25/2006 |
| 7053626 | Device and method for monitoring the connection of an electrical supply unit The invention relates to a device and a method for monitoring the connection of an electrical supply unit comprising voltage detection (32) detecting phase voltage (14), current detection (32) detecting phase voltages (38), a transformati... | 05/30/2006 |
| 7053598 | Structure for detecting plug/unplug status of phone-jacks by single bit generated by a resistor network The scheme for detecting the plug-in status by using single bit generated by a network with serial resistors, comprising a plurality of jacks having a spring switch, wherein the number of the plurality of jacks can be selected depending on the demand and a plurality... | 05/30/2006 |
| 7031859 | Apparatus and method for identifying cable phase in a three-phase power distribution network A line phase identification system and method identifies the phase of a power line at a remote unknown-phase line (160) in a three-phase power distribution network (100). The instantaneous phase of a known-phase line (150) is measured and saved ... | 04/18/2006 |
| 7010436 | Method and device for prediction of a zero-crossing alternating current An apparatus (14) for detecting a zero-crossing of an alternating current after occurrence of a fault in a current path (2) for determining a suitable time for opening an electric switching device (2) arranged in the current path for breaking th... | 03/07/2006 |
| 7005841 | Process for the relative locating of two electrical appliances A process allows the relative locating of a first electrical appliance and a second electrical appliance by the measurement of a first number of alternations or of electrical periods by the first electrical appliance from the energizing of the said first part and up... | 02/28/2006 |
| 6975490 | Apparatus and method for detecting phase state In an apparatus and a method for detecting a phase state capable of improving reliability of an air conditioner by preventing an abnormal operation of the air conditioner by detecting a phase state (antiphase and open-phase) of three phase AC power supplied to the a... | 12/13/2005 |
| 6891362 | Method and apparatus for estimating the phase of a signal An input signal is a complex vector whose phase is a coherent measurement of the phase rotation occurring between two separated symbols of a received CDMA signal. A processing block (30) provides a first signal showing the magnitude and the sign of the imagin... | 05/10/2005 |
| 6861839 | Magnetic field sensor A magnetic field sensor including an amplifier and a magnetic field element for outputting a signal to a switch circuit according to the strength of an applied magnetic field. The switch circuit outputs a signal selected by an external two-phase signal to an amplifi... | 03/01/2005 |
| 6859025 | Measurement of quantities of electric line A method and apparatus for measuring quantities of a multi-phase electric line, the apparatus comprising a control unit and a measurement unit in connection with each phase conductor of the electric line, wherein each measurement unit is arranged to measure a first ... | 02/22/2005 |
| 6734658 | Wireless alternating current phasing voltmeter multimeter A wireless alternating current phasing voltmeter multimeter that uses modular wireless based components in order to provide indications of highly desirable parameters of interest, such as AC voltage, phase rotation, and the number of degrees difference between phase... | 05/11/2004 |
| 6667610 | Apparatus and method for identifying cable phase in a three-phase power distribution network A cable phase identification system and method identifies the phase of a power cable at a remote location in a three-phase power distribution network. The instantaneous phase at a known phase location is measured and saved each GPS second using the 1 pps ... | 12/23/2003 |
| 6492799 | Monitor circuit for a current limiting device An electrical monitor circuit in which star points of taps on a first and a second side of a three-phase current limiting device are voltage compared. Possible applications are combinations with electrical switches, especially for power supplying and prot... | 12/10/2002 |
| 6466002 | Method for detecting a rotation direction in three-phase networks A method for identifying a rotation direction of a three-phase network includes the steps of sampling the individual phases at given times and using an evaluation algorithm to evaluate the measured values or interpolated approximate values, or only the ma... | 10/15/2002 |
| 6397157 | Method and apparatus for real time measurement of three phase electrical parameters An apparatus and method for determining, in real time, the key parameters of a three phase system electrical generator's output. A pair of reference vectors in quadrature (orthogonal) is phase-locked to a selected input open delta line to line voltage vec... | 05/28/2002 |
| 6175810 | Method of generating a signal identifying a three-pole short-circuit occuring in a three-phase power transmission line A method for generating a signal identifying a three-pole short-circuit occurring in a three-phase power transmission line in which the phase currents and phase voltages are sampled forming phase current and phase voltage sampling values and the signal is... | 01/16/2001 |
| 6173236 | Vector electricity meters and associated vector electricity metering methods Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed f... | 01/09/2001 |
| 6144925 | Device and method for determining the sign of the phase angle of two electrical signals The present invention pertains to a device and method for determining the sign of a phase angle of a first and second, essentially identical, periodic electric signals on corresponding first and second electrical conductors L1, L2, in particular, to deter... | 11/07/2000 |
| 6112159 | Robust electrical utility meter The present invention includes an electrical utility meter operable to measure power consumption. The method detects and compensates for one or more wiring errors that affects the power consumption measurement of the electrical utility meter. The method i... | 08/29/2000 |
| 6112158 | Service type recognition in electrical utility meter Disclosed is a method and arrangement for use in an electrical utility meter, the electrical utility meter operable to be connected to a plurality of electrical service types. The arrangement is operable to identify a present service type, the present ser... | 08/29/2000 |
| 5859530 | Process for determining the phase sequence in a three-phase network (rotary current network) In a first measurement step, the two test probes of a measurement apparatus are contacted with two of the three phase lines. The measurement apparatus determines the frequency of the three-phase voltage. In a subsequent second measurement step, one of the... | 01/12/1999 |
| 5854995 | Vector electricity meters and associated vector electricity metering methods Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed f... | 12/29/1998 |
| 5825173 | Circuit for detecting phase angle of three-phase alternating current A circuit for detecting the phase angle of a three-phase alternating current includes a plurality of low-pass filters installed at each input port for removing noise and high-frequency signals mixed in an alternating current input signal, a plurality of m... | 10/20/1998 |
| 5796258 | Adaptive quadrilateral characteristic distance relay A quadrilateral characteristic relay system for determining a fault associated with a multiple-phase electric power transmission system is disclosed. The system dynamically adapts one line of the quadrilateral trip region to account for the interaction of... | 08/18/1998 |
| 5754040 | Apparatus for testing medium voltage primary distribution cables Apparatus for performing a variety of tests, including phase matching, detection of open phases and energized/not energized verification, on primary distribution cables. The apparatus is operable from a location which is physically remote from the primary... | 05/19/1998 |
| 5680040 | System for detecting incorrect phase rotation A system for automatically detecting whether a power converter or inverter is correctly connected to a three-phase AC power source consisting of first, second, and third phases, the system comprising: a zero-crossing comparator (1) for determining whether... | 10/21/1997 |
| 5602469 | Apparatus for detecting the amplitude and phase of an a.c. signal An apparatus for detecting the amplitude and phase of an a.c. signal detects the a.c. signal with signal detection means (4), calculates an a.c. signal that is phase-shifted by the amount of the phase characteristic $c; of the calculation circuit (14) ... | 02/11/1997 |
