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| Number | Title | Issue Date |
| 7583181 | Supply line structure for supplying energy to electrical components of a motor vehicle A supply line structure for supplying energy to electrical components of a motor vehicle, and for the transmission of information between at least a portion of the components (so-called Powerline Communications). To improve the channel characteristics of the informa... | 09/01/2009 |
| 7423519 | Vehicular power line communication system Plural communication areas are provided, and plural electronic control units for mutually making communication in each of the communication areas are provided. A vehicular power line communication system includes a power line coupling the respective communication ar... | 09/09/2008 |
| 7378944 | Controlling power output of a modem for power line communications There is provided an arrangement of components for use in a power line communication system. The arrangement includes a modem for providing an output to a power line, a sensor for sensing a parameter of the output; and a controller for adjusting a power of the outpu... | 05/27/2008 |
| 7376535 | Wideband matching circuit and method of effectuating same A method is provided for determining an optimal performance of a lossless circuit. In one embodiment, the number of inductors and capacitors contained in a circuit of interest are input, and then a random search of a plurality of lossless circuits, each having the s... | 05/20/2008 |
| 7315234 | Load control apparatus and load control system A load control apparatus is connected to a master station through a power line supplied with direct-current power. The load control apparatus is driven by the direct-current power supplied from the power line to communicate with the master station through the power ... | 01/01/2008 |
| 7268670 | Power line communications system A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power suppl... | 09/11/2007 |
| 7193506 | Method and system for maximizing data throughput rate in a power line communications system by modifying payload symbol length Data throughput rate in a power line communications (“PLC”) system is controlled by generating PLC carrier signals in accordance with a PLC signal frame structure containing payload symbols where the payload symbol length is selected based on at least one of a P... | 03/20/2007 |
| 7177667 | Antenna remote control apparatus of mobile communication base station system An antenna remote control apparatus for a base station in a mobile communication system is disclosed. The antenna remote control apparatus includes a remote controller for matching a driving voltage for a motor used to control the beam direction of an antenna, a ref... | 02/13/2007 |
| 7091872 | Controlled power source for underground line location A transmitter for a line locator system that controls the electrical current, voltage or power applied to the target line is disclosed. Control of the electrical output of the transmitter can be achieved passively or by means of a feedback control system. A transmit... | 08/15/2006 |
| 7030733 | Power supply for phantom-feed LAN connected device using spare-pair powering A system for providing power to a local area network LAN connected device via spare wire pairs from a phantom feed LAN, the system comprising a first connector for connecting to the LAN connected device; a second connector for connecting to a LAN hub; and means for ... | 04/18/2006 |
| 4864274 | Remote reading thermostat An information transmission system using a pair of transmission interconnections to supply power from a collection station to an operating station, and to transmit information back based on the collection station providing a changing voltage on the two in... | 09/05/1989 |
| 4766414 | Power line communication interference preventing circuit A tuned circuit is provided for connection to a transmitter of a power line communication system. The tuned circuit comprises components selected to provide a low impedance path to ground for a power line communication signal of a preselected frequency. W... | 08/23/1988 |
| 4724381 | RF antenna for transmission line sensor A radiating antenna system for a self-contained sensor module mounted on a power transmission line. The module is capable of measuring various parameters such as line current, voltage, conductor temperature, and ambient temperature. The parameter values a... | 02/09/1988 |
| 4675579 | Coupling of carrier signal from power line The AC power line to a street luminaire carries a 200 KHz carrier signal for operating a switching relay that connects a dimming reactor in series with the discharge lamp. A pick-off transformer has a primary winding connected in series with the ballastin... | 06/23/1987 |
| 4636771 | Power line communications terminal and interface circuit associated therewith A communications terminal for transmitting and receiving communication signals over a power line communications network and including an interface circuit for coupling the terminal to the power line of the network is disclosed. One embodiment of the netwo... | 01/13/1987 |
| 4633217 | Communication apparatus A communication apparatus for receiving both power and a sensor signal over the same transmission line having a first variable impedance element and a receiving impedance element connected in series across the transmission line, a second variable impedanc... | 12/30/1986 |
| 4623871 | Receiving apparatus A receiving apparatus for receiving an electrical signal over a 2-wire transmission line, the electrical signal having a signal component and a bias component, the bias component being used by the receiving apparatus for providing power to the receiving a... | 11/18/1986 |
| 4517548 | Transmitter/receiver circuit for signal transmission over power wiring A system transmits and receives control signals for various types of indoor devices using the existing power wiring in houses and buildings. The transmitter section of the power wiring transmission system is provided with a circuit in which the output of ... | 05/14/1985 |
| 4473816 | Communications signal bypass around power line transformer A circuit for bi-directionally bypassing a delta-wye transformer with a balanced phase-to-neutral power line communications signal, using passive components. The circuit includes a set of three capacitors connected in a wye configuration, each having one ... | 09/25/1984 |
| 4473817 | Coupling power line communications signals around distribution transformers A circuit is described for bi-directionally coupling a communication signal around a distribution transformer. The circuit includes a single-phase coupling transformer with a primary to secondary voltage ratio approximately equal to that of the distributi... | 09/25/1984 |
| 4471399 | Power-line baseband communication system A communication system for transmitting baseband digital signals on an electrical power line. A pulse generator produces digital signals which are limited to a frequency spectrum of 30 kHz to 300 kHz and applied directly, i.e., without modulation, to an e... | 09/11/1984 |
| 4458236 | Communications signal coupling around wye/delta power transformation A circuit is disclosed for coupling a power line communications signal between two three-phase power lines, with the signal being transmitted in a balanced phase-to-neutral mode on the first line and in a phase-to-phase mode on the second line. The circui... | 07/03/1984 |
| 4392089 | Isolator for use with frequency responsive switching circuit A frequency responsive power control system includes an improved isolator in series electrical connection with respect to a ballasted lamp load. The isolator has a high inductive impedance at low current for blocking ballast induced noise signals from int... | 07/05/1983 |
| 4323882 | Method of, and apparatus for, inserting carrier frequency signal information onto distribution transformer primary winding Power line carrier frequency signals are provided at a distribution transformer primary winding by controlled current injection onto the neutral and phase conductors of the distribution transformer secondary winding circuit, with the direction of current ... | 04/06/1982 |
| 4300126 | Method and apparatus, for power line communications using zero crossing load interruption In a system for communicating information over a power line network, connection of power loads is interrupted in the vicinity of zero crossings of the A.C. power line waveform to provide a high impedance condition during which the transmitters and receive... | 11/10/1981 |
| 4254403 | Systems for transmitting information in an alternating current electricity supply system A system for transmitting information in an alternating current supply system wherein information is transmitted by reducing the instantaneous value of the supply voltage during a corresponding period in each of a selection of cycles of the supply voltage... | 03/03/1981 |
| 4215394 | Control logic for an inverter ripple controlled power system A load management system utilizing a three phase solid state inverter for applying a ripple signal on a high voltage line with the system having means (a) for conducting backfeed current from the line through a portion of the inverter, (b) for balancing t... | 07/29/1980 |
| 4205360 | Power line carrier apparatus Power line carrier apparatus of the on-off type, including a local transmitter and receiver coupled to a transmission line for communication with a remote station. An adjustable attenuator, located between the transmission line and the bandpass input filt... | 05/27/1980 |
| 4190790 | Isolator circuit for use with frequency sensitive switching circuit An isolator circuit for use with a switching circuit for energizing a ballasted load in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. In the switching circuit, a triac is gated to conduct th... | 02/26/1980 |
| 4188619 | Transformer arrangement for coupling a communication signal to a three-phase power line A communication signal is coupled simultaneously to all three phases of a neutral-wye three-phase power line through a transformer arrangement consisting of a low voltage set of three serially connected windings across which the signal is applied to produ... | 02/12/1980 |
| 4186873 | Humidity control system and circuitry A wireless form of humidity control for residential and other uses and comprising; a carrier current type of transmitter and receiver used in combination and within a conventional electrical wiring system for a building, said transmitter including a step-... | 02/05/1980 |
| 4169259 | Frequency sensitive switching circuit A switching circuit for energizing a load, such as fluorescent lamp ballasts, in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. A triac is gated to conduct the AC power to the load by a circu... | 09/25/1979 |
| 4139735 | Carrier current communications system A plurality of transmitters and receivers arranged for carrier current communications are generally placed throughout a large building. The transmitters and receivers are coupled to selected portions of the power distribution system. The selected portions... | 02/13/1979 |
| 4075675 | Ground conductor monitoring system and method A system and method for monitoring the continuity of a ground conductor in a power transmission system. A plurality of power transmission cables extend between a power source and a load and include a ground conductor extending between the source and the l... | 02/21/1978 |
| 4012733 | Distribution power line communication system including a messenger wire communications link A distribution power line communication system wherein communication signals are transferred between a communication terminal at a substation and communication terminals at customer locations. The communication signals are transferred between the terminal... | 03/15/1977 |
| 3946279 | Active impedance multiplier An active impedance multiplier circuit that can, as one of its uses, be used in a mine ground fault detection system. The purpose of the multiplier is to create a very high impedance for an AC signal that normally flows through a low impedance legitimate ... | 03/23/1976 |
