A correct commutation is realized even if a communication error occurs due to a change in an actuator drive current. An electronic control unit that includes a communication section outputting a control signal and that can transmit the control signal to an actuator connected to the electronic control unit via a power line, includes an actuator operation detection section. When the actuator operation detection section detects an actuator operation, the communication section retransmits the control signal at timing of detecting the actuator operation.

A fuel cell power generation plant is disclosed. The plant includes fuel cell systems, each of which includes a fuel cell stack, sensors, actuators, a DC-DC converter and a microcontroller. The stack is coupled to a DC bus via the converter. The microcontroller communicates with the sensors, the actuators and the converter, and is configured to acquire sensor data from the sensors and obtain control signals for the actuators and the converter. The plant further includes an inverter coupled with the converter of each system via the DC bus and coupled to a power load, a first power line communication (PLC) modem coupled with the microcontroller of each system, a second PLC modem coupled with the first PLC modem via the DC bus; and a plant controller coupled with the second PLC modem and communicating with the inverter. A method of communication for use in a fuel cell power generation plant is also disclosed.

Systems, methods, and apparatus for maintenance over an auxiliary power line are disclosed. In one or more embodiments, a disclosed method for generating and transmitting maintenance data from a unit on a vehicle comprises powering the unit by an auxiliary power line connected to the unit or a primary power line connected to the unit. The method further comprises modulating, by the unit, at least a portion of the maintenance data to generate at least one modulated signal. Further, the method comprises transmitting, from the unit, at least one modulated signal on the auxiliary power line. In one or more embodiments, the maintenance data comprises health management (HM) data, built in test (BIT) data, built in test equipment (BITE) data, and/or configuration data.

A first device provides both power and data to a second device over a power line connection between the two devices. The first device includes a power line extending from a power supply, a ground line extending from a ground, a first impedance in the power line, and a second impedance in the ground line. A modulator comprised of a transistor and modulator impedance is between the first impedance and the second impedance, and a tank capacitor is between the power line and the ground line, outside the first impedance and second impedance. A comparator is coupled between the first and second impedance. A switch may be included to short out the first and second impedance, thereby enabling transmission of only power for period of time, and return to a mode of transmitting both data and power. The first device may also receive data from the second device over the power line connection.

A first device provides both power and data to a second device over a power line connection between the two devices. The first device includes a power line extending from a power supply, a ground line extending from a ground, a first impedance in the power line, and a second impedance in the ground line. A modulator comprised of a transistor and modulator impedance is between the first impedance and the second impedance, and a tank capacitor is between the power line and the ground line, outside the first impedance and second impedance. A comparator is coupled between the first and second impedance. A switch may be included to short out the first and second impedance, thereby enabling transmission of only power for period of time, and return to a mode of transmitting both data and power. The first device may also receive data from the second device over the power line connection.

Systems for exchanging information between a cargo handling system of an aircraft and a Power Drive Unit (PDU) are described herein. The systems include a power source provided within the aircraft and a first PDU provided within the aircraft. The power source is capable of providing DC power to the at least one PDU via an electrical power line. The power source further including a first Power Line Communication (PLC) node and the PDU further including a second Power Line Communication (PLC) node. The first PLC node being capable of communicating with the second PLC node via the electrical power line.

An electrical connecting device includes an electrical conductor configured to transmit at least one of electrical energy and data between a first electrical component, which is arranged in a first housing that is electrically connected to a reference potential, and a second electrical component, which is arranged in a second housing that is electrically connected to the reference potential. The electrical connecting device also includes a first shielding device configured to shield the electrical conductor, wherein the first shielding device is electrically connected to the first housing, and a second shielding device configured to shield the electrical conductor, wherein the second shielding device is electrically connected to the second housing. The first shielding device is electrically isolated from the second shielding device.

An integrated networking scheme that enables data communication and power delivery over a single connection for a network of low power devices spread across a local area is disclosed. The integrated networking scheme provides a simplified technique to transfer data signal and power signal using a single cable with power coupling/decoupling enabled through a bias T-network with diodes, which enable multi-point power injection. A special transistor-resistor network controls the received signal spectrum. The integrated networking scheme provides a signal over power adapter attached to each low power devices in the local area network to enable coupling and decoupling of data signal and power signal. The scheme provides wide-band data communication capabilities, enables plug-and-play power and data capabilities to remote devices.

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.

A voltage conversion apparatus for converting from a control voltage to a supply voltage and an apparatus for converting from a supply voltage to a control voltage are described. The supply voltage is designed to power, through a coaxial cable, a data communication device, and the coaxial cable is suitable for transmitting said supply voltage signal and at least one data signal associated with said data communication device. A conversion means of the conversion apparatus is configured to convert from the control voltage to the supply voltage comprising conversion means configured to convert from a first value of control voltage Vp1 and from a second value of control voltage Vp2 to a first value of supply voltage Va1 and, respectively, to a second value of supply voltage Va2. Said first value of control voltage Vp1 and said second value of control voltage Vp2 are values of control voltage for controlling a device that is distinct from such a data communication device.