摘要:
The invention relates to a method for operating a UV radiation source of the low-pressure gas discharge type. Said method comprises the following steps:nullimpingement of at least one heating coil with a heating voltage until the temperature of said coil has been increased;nullimpingement of the heating coil with a starting voltage in order to induce a gas discharge;nullmaintenance of the gas discharge by the application of a maintaining voltage and the disconnection of the heating voltage after the gas discharge has been started; in addition the following steps are preferably executed at any point in the method:nullinterrogation of an identification means that is connected to the UV radiation source andnullif the response to the interrogation is negative, prevention or interruption of the operation,nullif the response to the interrogation is positive, authorization of the operation. The invention also relates to a UV radiation source comprising a base body (20) and at least one connection zone which bears a number of electric connections (24, 25; 26, 27), whereby an identification means (28) that can be interrogated electrically is connected to the base body (20); and to a UV disinfection facility for fluids, in particular for water or waste water, said facility comprising at least one UV radiation source and an electric control and supply circuit that is located at a distance from the radiation source, whereby the control and supply circuit comprises an interrogation means which is suitable for verifying the presence of an identification means which is optionally assigned to the UV radiation source(s).
摘要:
A controller for controlling decorative light displays includes plural outlet ports for providing power to a plurality of decorative light strings. The controller alternately illuminates and dims the different lights strings according to a variety of synchronized patterns.
摘要:
A lighting circuit for lighting a vehicular lamp including a plurality of light sources each having at least one light-emitting diode, includes: a switching regulator for outputting an output voltage based on a power-supply voltage received from an external DC power supply; a light source selecting unit for selecting the respective light sources one by one and supplying a supply current to a selected one light source by applying the output voltage of the switching regulator to the selected one light source; and an output controlling unit for controlling the output voltage output by the switching regulator to the selected one light source based on the supply current supplied to the selected one light source.
摘要:
A decorative light strand has user-selectable color schemes corresponding to several holidays for year-round use. The light strand has a plurality of lights including at least one commonly-controlled set of color-controllable multi-color LEDs; a decorating selector comprising a switch which provides a plurality of user-selectable settings; and logic coupled to the switch and the plurality of lights to provide different holiday color schemes in response to the user-selectable settings. Preferably, a plurality of commonly-controlled sets of color-controllable multi-color LEDs exist along the strand, where LEDs of each set are interleaved with LEDs of other sets along the light strand. Advantageously, this light strand may be hung permanently and utilized year-round for major holidays and other suitable occasions. In a color-scheme-controllable light strand, the use of such LEDs as described reduces the number of (or eliminates) non-lit bulbs for at least some color schemes, reduces the number of wired lines to the lights, and provides the light strand with a long-life which is especially desirable in a year-round application.
摘要:
A ballast (100) includes an inverter (140,144,146) and a protection circuit that prevents excessive lamp-to-earth-ground fault current. The protection circuit includes a transformer (202,204,206,208,210) and an inverter disable circuit (300). The transformer measures a first current going out of one set of ballast output terminals (106,108) and a second current going into another set of ballast output terminals (206,208). In response to a substantial imbalance between the first current and the second current, inverter disable circuit (300) terminates inverter switching. Preferably, protection circuit further includes a restart timer circuit (400) that, following termination of inverter switching in response to a fault condition, prevents the inverter from restarting for a predetermined delay period.
摘要:
A lighting apparatus includes a primary power supply, a primary lighting unit, a control unit, a secondary lighting unit, a light sensor, and a back-up power supply. The control unit is connected to the primary power supply, the primary lighting unit, the secondary lighting unit, the light sensor and the back-up power supply. The primary lighting unit includes at least one high-power lamp controlled by the control unit. The secondary lighting unit includes at least one low-power high-intensity light source. The light sensor generates a light signal corresponding to intensity of ambient light. The control unit enables operation of the secondary lighting unit when the primary lighting unit is deactivated during poor ambient light conditions, and further enables supply of power from the back-up power supply to the secondary lighting unit to activate the latter when power failure of the primary power supply occurs.
摘要:
A controller for reducing acoustic noise produced during use of a leading edge dimmer, includes a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the leading edge controller and responsive to the control signal for linearly switching the input voltage so that a rate of rise of the leading edge is decreased. A trailing-edge controller may be coupled to a leading-trailing edge detector and responsive to detection of a trailing edge dimmer for disabling the leading edge controller and decreasing a rate of decline of the trailing edge of the input voltage.
摘要:
The invention relates to an electronic circuit for operating a High Intensity Discharge (HID) lamp, in particular a Ultra High Pressure (UHP) lamp, such as those preferably used in image projectors. The circuit comprises a lamp ballast 110 for offering a controlled lamp current for operating the HID lamp 422 and a brightness sensor 130 for generating and providing a sensor signal which represents the brightness of the light applied by the lamp to the image generator. The lamp ballast 110 controls the lamp current such that the brightness of the light of the lamp remains constant. It is an object of the invention to develop the electronic circuit and the image projector further such that the brightness control is made possible throughout the entire operational life of the lamp 322, and the use of sensors of simple construction, and thus less expensive sensors, is made possible. This object is achieved by means of a filter 140 which high-pass filters the sensor signal before it is supplied as a control signal to the lamp ballast 110, and in particular to a control unit within the lamp ballast.
摘要:
A backlight control device and method of an LCD can reduce or minimize the battery usage by a backlight lamp while maintaining the brightness of a reflective LCD at an adequate level by operating backlight control using intensity of detected surrounding light within a selected control range from a plurality of backlight control ranges. The backlight control ranges can vary in number but are directed into various levels, according to the intensity of surrounding light and use of a battery or an external power source.
摘要:
Light system useful for activating light-activated materials are disclosed. Various configurations of light emitting semiconductor chips and heat sinks are disclosed, as well as various structures and methods for driving, controlling and using them, and materials and structures usable therewith.