Abstract: An electronic frame for use in a downhole component coupling mechanism includes: a first frame element including at least one retaining structure configured to retain an electronic component; and a second frame element configured to be disposed at the first frame element, the second frame element permanently joined to the first frame element to isolate the electronic component from downhole fluids and form the electronic frame, the electronic frame configured to be disposed in a coupling assembly of a first downhole component and a second downhole component and constrained axially by the coupling assembly.

Abstract: A DC block RF device includes a housing defining a cavity having a central axis, an input conductor disposed in the cavity of the housing and extending substantially along the central axis of the cavity and an output conductor disposed in the cavity of the housing and extending substantially along the central axis of the cavity. The DC block RF device further includes a first capacitor connected to the input conductor and a second capacitor connected to the output conductor and the first capacitor. In addition, the DC block RF device includes a coil for grounding surge signals, the coil having an inner edge connected to the center conductor and an outer edge connected to the housing of the device. During a surge, the first capacitor is configured to arc the surge across the capacitor without damaging the capacitor so the surge can dissipate through coil to ground.

Abstract: Embodiments of the invention are directed to systems and methods using an interruption device for automatically re-routing power upon the occurrence of an event. The interruption device may interrupt the flow of power to an external device upon the detection of an event, such as a circuit overload or short circuit. Interrupting the flow of power may cause power to be cut off to a receiving connector, which supplies power to the external device, by re-routing the flow of power away from the receiving connector by the use of relay switches. By interrupting and re-routing the flow of power, an electrical fire, damage to the external device or other hazard may be prevented. Once the source of the problem, such as a defective external device, has been removed or fixed, the flow of power may be re-routed back to the receiving connector.

Abstract: A three-phase AC power controller has three strands, each having an input and an output. Five pairs of valves are connected antiparallel for rotating field reversal. The first input is connected to the first output by way of a first pair, the second input is connected to the second output by way of a second pair and to the third output by way of a third pair, and the third input is connected to the second output by way of a fourth pair and to the third output by way of a fifth pair. An RC half-branch is connected as a snubber circuit to each input and to each output. These RC half-branches are each interconnected via a transverse connection.

Abstract: In a charging control circuit for controlling charging of a secondary battery, a charging transistor generates a charging current according to a control signal input to a control electrode and outputs the charging current to the secondary battery. The proportional current generation transistor generates and outputs a proportional current proportional to the charging current output by the charging transistor. The constant current charging controller controls the charging transistor so that the proportional current generated by the proportional current generation transistor attains a predetermined first value. The constant current charging controller controls a voltage of a current output terminal of the proportional current generation transistor so that a voltage difference between the voltage of the current output terminal of the proportional current generation transistor and a voltage of a current output terminal of the charging transistor is maintained at a predetermined second value.

Abstract: A line state detecting apparatus provided in a balanced transmission system includes, in transmission lines comprising a pair of conductors W1, W2 connected to a transmitting portion 13, current transformers T11, T12 primary sides of which are inserted to respectives thereof in series therewith and secondary sides of which are connected in series to cancel currents or voltages of the two transformer by each other, and a detecting portion 11 for detecting currents or voltages on secondary sides of the current transformers T11, T12. By an output of the detecting portion 11, a difference of currents or voltages of the conductors W1, W2 of the transmission lines is provided and an unbalance component between the conductors W1, W2 is detected.

Abstract: A controller for a power inverter having a gate assembly with an alternating current power output. A gate driver controls the activation of the gate assembly while a processor controls the operation of the gate driver. A current sensor has an output signal representative of the current at the power output. A noise detector circuit provides an output signal to the processor of the frequency of electromagnetic noise in the power inverter and the processor is programmed to sample the current from the current sensor at the frequency of the noise.

Abstract: Embodiments disclosed herein describe a network device including a class AB common mode suppression (CMS) circuit coupled in parallel between a line voltage source and a physical layer (PHY) device that provides active EMI suppression and Phy device termination. A network connector is coupled to provide the line voltage source to the class AB CMS circuit. The class AB CMS circuit provides current to the PHY device, terminates open-drain transmit drivers of the PHY device and suppresses common mode noise thereby minimizing electromagnetic interference. In other embodiments, the class AB CMS circuit is coupled in parallel between the network connector and a physical layer (PHY) device. The class AB CMS circuit suppresses common mode noise, and terminates open-drain transmit drivers of the PHY device, thereby minimizing electromagnetic interference.

Abstract: A transmission system in a downhole component comprises a plurality of data transmission elements. A coaxial cable having an inner conductor and an outer conductor is disposed within a passage in the downhole component such that at least one capacitor is disposed in the passage and having a first terminal coupled to the inner conductor and a second terminal coupled to the outer conductor. Preferably the transmission element comprises an electrically conducting coil. Preferably, within the passage a connector is adapted to electrically connect the inner conductor of the coaxial cable and the lead wire. The coaxial capacitor may be disposed between and in electrically communication with the connector and the passage. In another embodiment a connector is adapted to electrical connect a first and a second portion of the inner conductor of the coaxial cable and a coaxial capacitor is in electrical communication with the connector and the passage.

Abstract: A method of controlling the effective impedance of a low-impedance high-temperature superconducting cable (“HTS cable”). Passive or active control circuitry is used to create a current in the shielding conductor of the HTS cable which opposes the current in the primary conductor. In the case of a three-phase conductor, magnetic cross-coupling between the phases is exploited. The magnitude of the magnetic field is used to alter the HTS cable's effective impedance. The result is the creation of a controlled and substantially-higher effective impedance for the HTS cable. The creation of the higher impedance allows the HTS cable to be connected in parallel with conventional lines while regulating the amount of current flowing through the HTS cable.

Abstract: Power lines include three or more conductors for transmitting alternating currents. The conductors are arranged in one combination of the conductor arrangement so that the sum of phase differences between the currents flowing through adjacent conductors is maximum, and if there exists a plurality of such combinations, the one combination is selected in which the value of the smallest one of the phase differences between the currents flowing through every adjacent conductor is largest. With this arrangement, power loss is reduced.

Abstract: An annular wire harness for use in drill pipe comprising two rings interconnected by one or more insulated conductors. The rings are positioned within annular grooves located within the tool joints and the conductors are fixed within grooves along the bore wall of the pipe. The rings may be recessed within annular grooves in order to permit refacing of the tool joint. The rings are provided with means for coupling a power and data signal from an adjacent pipe to the conductors in such a fashion that the signal may be transmitted along the drill pipe and along an entire drill string.

Abstract: The present invention features a method and an apparatus for distributing electrical power from a power source to a distribution transformer, using at least one hot-phase conductor, a neutral conductor and an independent ground conductor. The neutral conductor is connected to the ground conductor at only one point in the distribution system, preferably at or near the power source. Normal imbalance current flows only in the neutral conductor. Return current flow in the earth is eliminated by the single point neutral-to-ground connection. Magnetic field (MF) generation in this power distribution system is thus reduced and stray voltage problems eliminated. In addition, high-impedance faults are easily detected because the only current ever flowing in the ground conductor is fault current. A method is also described for converting existing power distribution systems to the independent ground topology of the present invention.

Abstract: A circuitry (1) for reducing the magnetic field from multi-phase power lines for high voltage alternating current is disclosed. One phase (R) is split into two branches (R1, R2) forming a closed loop along a line portion (L). The self-reactance of the loop is adjusted for minimal magnetic field generation in the vicinity of the power line by a coupling to a compensation device, in the form of a capacitor (12), in a separate circuit (11), via a transformer (2).

Abstract: A power-line communication system (10) for use with a conventional AC source (12) having a hot wire (14) and a neutral wire (16). The communication system (10) includes a pulse transmitter (16) and at least one receiver (18) connected downstream from the pulse transmitter (16). The pulse transmitter (16) is coupled between the hot wire (14) of the AC source (12) and either the neutral wire (16) of the AC source (12) or earth ground. Each receiver (14) is coupled to the AC source (12). The pulse transmitter (16) includes a control circuit (30) for controlling the conduction of a shunt circuit (32) and sends messages to the receivers (20) by inducing momentary pulses in the AC voltage supplied by the AC source (12). The shunt circuit (32) includes a power switch (52) and an energy clamp circuit for limiting the amplitude and the duration of the current through the power switch (52) and the pulse induced in the AC line voltage.

Abstract: In an electrical power system for a residential building, a multi-conductor cable supplies power to loads in the residential building from a power supply. A net current returning from loads to the power supply via alternative conductive paths different from the neutral conductor in the cable creates a magnetic field in the vicinity of and inside of the residential building. A net current control device, including a ferromagnetic core, is attached to the multi-conductor cable in order to increase the impedance of the alternate conductive paths to the net current and to increase the net current flowing along the neutral conductor. Various modifications of the net current control device are disclosed.

Abstract: A differential torquer having at least one bifilar winding mounted on the torquer is disclosed. The bifilar winding has opposing polarities and the torquer is particularly well suited for use in reducing the temperature sensitivity of torquer servo loops.

Abstract: A line filter for a power supply includes a differential amplifier which is driven from across an inductor in series with a principal current carrying path of the power supply. The differential amplifier output is connected to a capacitance returned to ground for canceling common mode interference as may be generated in the power supply.

Abstract: Shield of telecommunications cable is grounded through negative impedance converter to reduce induced voltage in conductors in the cable caused by electromagnetic field of nearby powerline.

Abstract: Arrangement for transmitting at least two signals from a first circuit arrangement to a separate second circuit arrangement. In order to realize a disturbance-independent signal transmission with a small number of signal conductors, one signal conductor which includes an impedance having a high impedance value is provided between each of the signal sources of the first circuit arrangement and a separate signal sink of the second circuit arrangement. In addition, a signal conductor which includes an impedance having a high impedance value is provided between the ground of the first circuit arrangement and a separate signal sink of the second circuit arrangement. The second circuit arrangement comprises means for linearily combining the currents flowing in the signal conductors, for generating signal currents which are proportional to the transmitted signals.

Abstract: A circuit for eliminating a.c. noise current which is produced as a result of the interruption of electrical contact between a brush and a commutator of a d.c. motor and comprises a capacitor which applies the noise current to a transistor, which in turn inverts the waveform of the current and applies it in an inverted phase to a power source for the motor, thereby cancelling the a.c. noise.