An apparatus comprising a signal transformer coupled to a power line and a signal transmission, reception, or detection circuit. A sensor is configured to be responsive to the power line current or magnetic flux generated in a ferrite core of the signal transformer. When the sensor indicates that the flux generated by the power line current mat cause an attenuation of the signal strength, a second circuit generates a current through a flux cancelling winding that cancels at least some of the flux generated by the power line current.

A server system includes a common power bus, a power supply to provide direct current (DC) power through the common power bus, at least one node including a processor to receive the DC power through the common power bus, a transmitter capacitive coupled to the common power bus to transmit a power information signal from the power supply through the common power bus, and at least one receiver capacitive coupled to the common power bus to receive the power information signal transmitted by the transmitter and to provide the received power information signal to the at least one node. A plurality of buffers respectively coupled between the common power bus and each of the power supply and the at least one node provide path separation for high frequency and low frequency currents.

Methods and devices for wired charging and communication with a wearable device are described. In one embodiment, a symmetrical contact interface comprises a first contact pad and a second contact pad, and particular wired circuitry is coupled to the first and second contact pads to enable charging as well as receive and transmit communications via the contact pads as part of various device states.

According to an embodiment of the present invention, there is provided a photovoltaic module including a photovoltaic solar cell, a converter to convert a level of a direct current power from the photovoltaic solar cell, an inverter to convert the direct current power from the converter into an alternating current power, a controller to control the converter and the inverter, and a communication unit to perform electric power line communication with a gateway and at least one nearby photovoltaic module, in which the communication unit periodically transmits communication state information to the gateway and the at least one nearby photovoltaic module using the electric power line communication, and receives a message transmitted by the gateway along a path determined according to the communication state information.

A transmitting apparatus includes a first signal outputter configured to output a first signal to a receiving apparatus via a first line; and a communicator connected to a second line that connects a receiving-side ground node and the first signal outputter with an AC connection, the receiving-side ground node being supplied with a ground potential of the receiving apparatus, and the communicator being configured to transmit a second signal from the transmitting apparatus to the receiving apparatus by causing a direct current, a magnitude of which changes based on a logic level of the second signal, to flow in the second line, or to receive the second signal from the receiving apparatus by detecting a magnitude of a direct current flowing in the second line.

Disclosed are a method and a device for supplying electrical power for two or more technical systems, which are connected to an electrical supply line with a feed point, arranged in a connecting rod, and for data transmission between the feed point and the technical systems, supplying power to the technical systems is done with essentially constant current intensity. Data transmission from the feed point to the technical systems is done by modulating the current intensity, and data transmission from the technical systems to the feed point is done by modulating the voltage.

A first electrical node configured to monitor a digital signal is disclosed. The first electrical node includes a first connector and a second connector. The first electrical node includes a processor configured to receive a digital signal from the second connector. The processor is configured to determine whether a portion of the digital signal is intended for the first electrical node. The processor is configured to convert the portion of the digital signal to an analog signal based on whether the portion is intended for the first electrical node without affecting the digital signal received.

A processing method and LED module based on a power line transmission amplitude-modulated signal, which comprises a voltage processing module, a voltage regulator module, a control module, a constant current module, a signal comparison module, an oscillator and an LED, wherein an amplitude-modulated signal having a high and low level is input from a positive electrode terminal and then processed by the voltage processing module for input to the voltage regulator module, a power supply voltage is provided respectively for the LED and the control module under the effect of the voltage regulator module, and a reference voltage is provided for the signal comparison module; the amplitude-modulated signal is input to the signal comparison module, such that a control signal is obtained under the effect of the signal comparison module for input to the control module. In the invention, the LED emits light stably, and can be automatically produced.

A signal processing device is usable in a communication system and includes a signal path, a signal detector, a signal synthesizer, a transmission unit, and a receive path including an analog-to-digital converter. The signal path transmits a transmission signal that was transmitted by the communication system and that contains a communication signal. The signal detector detects, and generates an activation signal in response to, an interference signal contained in the transmission signal and occurring due to narrowband interferences. The signal synthesizer generates an approximation signal for the interference signal upon the presence of the activation signal. The transmission unit receives the transmission signal transmitted by the signal path and the approximation signal, and outputs a difference signal between the transmission signal and the approximation signal. The analog-to-digital converter converts a signal generated based on the difference signal into a digital signal.

A power line communication device includes a DC power source device, a power line, and a master station that modulates a supply voltage VBUS supplied to the power line according to transmission data to be transmitted. The master station includes a modulation capacitor that is precharged with a modulation amplitude voltage, a polarity switch unit that determines a polarity of the modulation capacitor connected to the power line according to transmission data, and an inductor connected between the DC power source device and the power line.