Abstract: A distributed controller of an aircraft includes a first communication device, a second communication device, and at least one processor. The first communication device is configured to transmit heater status data and receive heater command data via radio waves or power-line communication. The second communication device is configured to transmit at least one heater control signal and to receive heater sensor data. The at least one processor is configured to provide heater control based upon the heater command data and the heater sensor data and to provide heater status information based upon the received heater sensor data.

Abstract: A heating arrangement has a positive temperature coefficient (“PTC”) heater. A resistor is electrically in series with the PTC heater sized and configured to limit current through the PTC heater and the resistor below a selected value.

Abstract: A heating arrangement has a positive temperature coefficient (“PTC”) heater. A resistor is electrically in series with the PTC heater sized and configured to limit current through the PTC heater and the resistor below a selected value.

Abstract: A power control system includes a multi-phase power source, an ungrounded multi-phase load, a plurality of power switching circuits and a plurality of zero-crossing circuits. The multi-phase power source includes a plurality of phase power outputs. The plurality of power switching circuits are each connected to provide power from one of the plurality of phase power outputs to the ungrounded multiphase load. The plurality of zero-crossing circuits are connected to provide control signals to the plurality of power switching circuits. Each of the plurality of zero-crossing circuits are connected between one of the plurality of power phase outputs and an ungrounded reference.

Abstract: A power control system includes a multi-phase power source, an ungrounded multi-phase load, a plurality of power switching circuits and a plurality of zero-crossing circuits. The multi-phase power source includes a plurality of phase power outputs. The plurality of power switching circuits are each connected to provide power from one of the plurality of phase power outputs to the ungrounded multiphase load. The plurality of zero-crossing circuits are connected to provide control signals to the plurality of power switching circuits. Each of the plurality of zero-crossing circuits are connected between one of the plurality of power phase outputs and an ungrounded reference.

Abstract: A water-purification device (22) for a potable water system comprising a chamber (23) through which water flows, a plurality of light-emitting diodes (24) that radiate ultraviolet light into the water within the chamber (23), and a driver circuit (26) providing power to the light-emitting diodes. The light-emitting diodes (24) can be positioned within or outside of the chamber (23) and they can be electrically connected in series. The drive circuit (26) receives voltage from a power source (e.g., an onboard power source on an aircraft) and can include a feedback accessory (40), an input accessory (42) and/or a fault-status accessory (44).

Abstract: An aircraft hot water supply system (10) comprising a group of water-use stations (14a-14f) each including a hot water line having a heater (40a-40f) which heats water at a heating rate dependent upon power provided thereto. A power manager (44) allocates different non-zero percentages of heater-dedicated power to different heaters (40) depending upon conditions at the corresponding water-use stations (14). A network (46) is provided to establish peer-to-peer communication among the heaters' controllers (48a-48f).