Abstract: A dual mode light operated timing device includes a light sensor for generating a light sensor signal when light is detected; a first input device for generating a first programming signal; a second input device for generating a second programming signal; a switch for connecting and disconnecting power from a power supply to an electronic device; and a processor for receiving the light sensor signal and when light is detected by the light sensor operating the timing device in a daytime mode by controlling the switch based on the first programming signal, and when light is not detected by the light sensor operating the timing device in a nighttime mode by controlling the switch based on the second programming signal.
Abstract: A system for measuring the power or energy loss in a photovoltaic array due to soiling, which is the accumulation of dust, dirt, and/or other contaminants on the surfaces of photovoltaic modules, comprising: a pair of photovoltaic reference devices placed within or near the photovoltaic array and co-planar to the modules comprising the array, wherein one reference device is a module or cell similar to those of the array and is allowed to accumulate soiling at the natural rate, and wherein the second reference device is a module or a cell and is maintained clean; and a measurement and control unit which measures and compares the electrical outputs of the soiled reference device and the clean reference device in order to determine the fraction of power lost by the soiled reference module due to soiling.
Abstract: A metering apparatus enclosed within a first housing, the metering apparatus comprising a plurality of metering points, wherein the metering apparatus, via the plurality of metering points, measures electricity usage for each of a plurality of corresponding electricity consumer lines; the metering apparatus in communication with one or more sensors that sense environmental conditions in a second housing enclosing a distribution transformer that steps down voltage from a distribution level to a consumer level, wherein the sensors are not operable to sense environmental conditions in the first housing, and wherein the meter apparatus is operable to connect and disconnect service on one or more of the plurality of electricity consumer lines in response to information received from the one or more sensors, without affecting voltage supplied to the distribution transformer.
Abstract: A transformer is composed of three or more windings magnetically coupled. An AC/DC converter (2) for converting AC power of an AC power supply (1), a capacitor (3), and a switching circuit (4) are connected to one winding (6a), and a switching circuit (8) or (30) for power conversion of a DC power supply is connected to at least one of the other windings. Voltage of the capacitor (3) or the AC power supply (1) is detected. On the basis of the detected value thereof, the operation state of each switching circuit (4), (8), (30) is determined by an operation state determination circuit (101). On the basis of a result of the determination, the power supply is switched among the AC power supply (1) and the DC power supplies (11) and (34) by an output switch circuit (103).
Abstract: A microgrid energy management system can include: a bus providing a power; a transmission line connected to the bus; a relay connected to the transmission line, sensing a microgrid according to a state of the transmission line, adjusting a relay setting, and generating a trip signal representing the relay setting; and a circuit breaker receiving the trip signal. In addition, the microgrid energy management system further includes an energy storage device connected to the bus.
May 16, 2018
Date of Patent:
April 23, 2019
The Florida International University Board of Trustees
Hany Fawzy Habib, Tarek Youssef, Osama Mohammed
Abstract: A control device for a power supply system includes a pre-charge unit, the power supply system having a main electric storage device, a smooth capacitor, a step-up circuit, an open-close switch, a voltage source and a regulation element. The regulation element regulates a current flowing from the smooth capacitor toward the open-close switch. The voltage source is connected to a connection portion between the open-close switch and the step-up circuit, and outputs an output voltage higher than a voltage of the main electric storage device before the open-close switch is shifted from a disconnection state to a connection state. The pre-charge unit executes a pre-charge of the smooth capacitor by supplying electric power from the voltage source to the smooth capacitor before the open-close switch is shifted from the disconnection state to the connection state.
October 13, 2016
Date of Patent:
March 19, 2019
DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA