摘要:
A two-wire load control device (such as, a dimmer switch) is operable to control the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) and has substantially no minimum load requirement. The dimmer switch includes a bidirectional semiconductor switch, which is operable to be rendered conductive each half-cycle and to remain conductive independent of the magnitude of a load current conducted through semiconductor switch. The dimmer switch comprises a control circuit that conducts a control current through the load in order to generate a gate drive signal for rendering the bidirectional semiconductor switch conductive and non-conductive each half-cycle. The control circuit may provide a constant gate drive to the bidirectional semiconductor switch after the bidirectional semiconductor switch is rendered conductive each half-cycle. The bidirectional semiconductor switch may comprise, for example, a triac or two field-effect transistors coupled in anti-series connection.
摘要:
A dimming system and method of operating the same are provided. The dimming system includes a first terminal configured to operatively connect to a first conductive line, a second terminal configured to operatively connect to a second conductive line, and a third terminal configured to operatively connect to a third conductive line. The first conductive line is configured to connect to a load, the second conductive line is configured to supply an alternating current, and the third conductive line is configured to connect to a current path. The dimming system further includes a controller operatively connected to at least one of the first, second and third terminals for controlling operation of the dimming system. The first and second terminals are configured for electrically connecting to a primary power supply and the first and third terminals are configured for electrically connecting to a secondary power supply. The primary power supply is powered through connection to neutral, and wherein the secondary power supply is powered through connection to an earth ground.
摘要:
A load control device for controlling the amount of power delivered to an electrical load from an AC power source provides improved sensory feedback to a user of the load control device. The load control device comprises a touch screen actuator having a touch sensitive front surface responsive to a plurality of point actuations, each characterized by a position and a force. The touch screen actuator has an output operatively coupled to a controller for providing a control signal representative of the position of the point actuation. The load control device further comprises a visual display and an audible sound generator, both responsive to the controller. The controller is operable to cause the visual display to illuminate and the audible sound generator to generate an audible sound in response to the control signal of the touch screen actuator.
摘要:
This disclosure describes a lighting apparatus comprising a light hue modulating device that generates compensating light to adjust the light to a desired hue within a space regardless of the hue of the ambient light within the room.
摘要:
A bathtub toy has a battery, timing circuit and an audible or visible output. A motion responsive switch closes to connect the battery to the output and start the timing circuit. The timing circuit shuts off the output after an interval until the switch again closes after the interval.
摘要:
A wing tip system for rotor craft includes a downwardly-facing light housing to provide a visual aid to rotor wingtip position. This system is visible to crew members and to adjacent crew, particularly when using night vision goggles (NVG) or other ambient night vision (ANVIS) equipment. This allows tip lighting to be provided in situations where covert helicopter operations are desired. The lighting further is compatible with ANVIS equipment, in that it permits operation noncandescent light in order to prevent blooming or other effects which would otherwise diminish the effectiveness of the ANVIS equipment. The lighting system further has a higher level of illumination, in which rotor tip lighting is increased to become more visible without the use of ANVIS equipment.
摘要:
A fishing lure will time an interval if a motion responsive switch closes in the absence of an interval. During the interval power is supplied to an output circuit. The output circuit may energize radiation probes, a light or a speaker.
摘要:
An illumination level control device (10) is disclosed which sequentially reduces the illumination level of a multi-bulb lamp (12). The illumination level control device (10) incorporates two D flip-flops (38,40) configured in a master-slave relationship wherein the two D flip-flops (38,40) change their respective states when the clock (60) sends a positive-edge of the clock signal thereto. A portion (58) of the device (10) sets the two D flip-flops (38,40) when the wall switch (22) is off for more than a predetermined time. In the case of a three bulb (14,16,18) lamp (12), a zero state preventor (56) prevents all of the bulbs (14,16,18) from being turned off when the wall switch (22) is in the ON position. The zero state preventor (56) effectively eliminates the state wherein the outputs of both of the two D flip-flops (38,40) are low.
摘要:
A fishing lure contains a light source which is turned on by the OFF to ON transition of a switch. Timing means will turn the light off at the end of an interval following the OFF to ON transition. Preferably a sensor only allows the light being turned on by an OFF to ON transition when the lure is submerged in water.