Abstract:
A harvesting and measurement device is operable in at least a normal operation mode, a demand measurement mode, and a fault measurement mode. In the normal operation mode, the device is able to harvest energy from an associated power line and monitor current and voltage conditions through a lower power circuit. In the demand measurement mode, harvesting elements of the circuit are disabled so as not to interfere with accuracy of demand current measurements. In the fault measurement mode, one or more Hall sensors are activated such that high currents can be accurately measured.
Abstract:
A current sensing circuit for an electronic power converter having an inductor that is not referenced to ground is configured to provide an output signal that is referenced to ground and is proportional to the current flow between the inductor and a load in an electrical power system. The current sensing circuit includes outputs associated with a voltage of the inductor, a current source circuit, a current steering circuit responsive to the voltage outputs and a level shifting circuit.
Abstract:
An electrochemical energy storage device includes a housing, at least one energy storage element in the housing and operable with an electrolyte, a cap coupled to the housing, at least one electrolyte impregnation hole formed in the cap, and a first terminal lug attachable to the cap via the electrolyte impregnation hole.
Abstract:
Electrochemical energy storage devices such as electric double layer capacitors include a flexible metal contact current collector establishing electrical contact with a conductive housing at numerous contact points. The flexible current collector simplifies manufacturing of the device and avoids laser welding on the conductive housing. The manufacture devices are operable with a reduced direct current resistance by virtue of the flexible current collector
Abstract:
A filter system for an explosion-proof enclosure is described herein. The filter system can include a pre-filter assembly located outside the explosion-proof enclosure. The pre-filter assembly can include a pre-filter material configured to control air passing therethrough. The filter system can also include a filter assembly coupled to the pre-filter assembly. The filter assembly can further control the air received from the pre-filter assembly and passing therethrough into the explosion-proof enclosure.
Abstract:
A system for suppressing an overheat condition in an electrical housing includes an electrical housing that defines a housing area including one or more electrical devices; a suppression fluid container containing a suppression fluid; a valve configured to regulate the flow of the suppression fluid from the suppression fluid container to the housing area; at least one sensor configured to sense at least one of temperature and smoke; and a controller communicatively connected to the at least one sensor and the valve, the controller configured to receive signals from the at least one sensor indicating an overheat condition in the housing area; and in response to the received signals indicating the overheat condition in the housing area, control the valve to allow the suppression fluid to flow from the suppression fluid container into the housing area, in order to suppress the overheat condition in the housing area.
Abstract:
An isolated DC to DC converter including zero voltage switching and a current doubler. Current sensors are located between a positive input of the DC to DC converter and a current doubler is used in an output stage of the DC to DC converter in order to enable more accurate current sensing in a main transformer to prevent saturation of the transformer core and provide increased efficiency and power output with lower electromagnetic noise. The input of the DC to DC converter is isolated from the output of the DC to DC converter, and the DC to DC converter may be used in a hybrid or all-electric vehicle to provide an accessory bus from a power source of the vehicle.
Abstract:
A luminaire includes a stationary heat sink and an LED module adjustably coupled to the stationary heat sink. The LED module is inserted into a cavity formed within the stationary heat sink and includes a slot therein. The slot includes a first and second end. According to some exemplary embodiments, a fastening device is inserted through the slot and fixedly coupled to an interior sidewall of the stationary heat sink. The LED module is directionally adjustable by sliding the slot between the ends with respect to the fixedly coupled fastening device. The LED module includes a second heat sink which is rotatable with respect to the stationary heat sink and maintains continuous contact with the stationary heat sink along the LED module's full rotational range. According to some exemplary embodiments, the first end is positioned lower than the second end. According to some exemplary embodiments, the slot is arcuately-shaped.
Abstract:
A recessed light fixture includes an LED module, which includes a single LED package that is configured to generate all light emitted by the recessed light fixture. For example, the LED package can include multiple LEDs mounted to a common substrate. The LED package can be coupled to a heat sink for dissipating heat from the LEDs. The heat sink can include a core member from which fins extend. Each fin can include one or more straight and/or curved portions. A reflector housing may be coupled to the heat sink and configured to receive a reflector. The reflector can have any geometry, such as a bell-shaped geometry including two radii of curvature that join together at an inflection point. An optic coupler can be coupled to the reflector housing and configured to cover electrical connections at the substrate and to guide light emitted by the LED package.