摘要:
A driver circuit for operating one or more light emitting diodes(LEDs) is disclosed. An alternating supply current is generated and transformed to an alternating secondary winding voltage. Using rectifier means, such as diodes or synchronous switches, the alternating secondary winding voltage is converted to a substantially constant load current by using a buffer element. The buffer element comprises an output choke, such as an inductor. The power transferred from the power source to the LEDs may be controlled by frequency control of the alternating supply current.
摘要:
Disclosed is a lighting device, including at least partially reflective electroactive polymer actuator and a lighting element illuminating the electroactive polymer actuator. A voltage control arrangement for driving the electroactive polymer actuator with a spatially varying voltage distribution is provided. This way, the curvature and alignment of the reflective surface of the electroactive polymer actuator can be adjusted as needed, thereby providing an optimized beam pattern for the relevant field of application.
摘要:
The invention relates to alighting device which comprises an at least partly reflective electroactive polymer actuator (1) and a lighting element (2) illuminating the electroactive polymer actuator. A voltage control arrangement (4) for driving the electroactive polymer actuator (1) with a spatially varying voltage distribution is provided. This way, the curvature and alignment of the reflective surface of the electroactive polymer actuator (1) can be adapted to the requirements, thus always providing an optimized beam pattern for the relevant field of application
摘要:
In a method and a driver circuit for operating one or more light emitting diodes, LEDs, an alternating supply current is generated and transformed to an alternating secondary winding voltage. Using rectifier means, such as diodes or synchronous switches, the alternating secondary winding voltage is converted to a substantially constant load current by using a buffer element, such as an output choke, i.e. a suitable inductor. The power transferred from the power source to the LEDs may be controlled by frequency control of the alternating supply current.
摘要:
A lighting device for generating colored and white light. According to the invention the lighting device comprises at least one light source (1, 4) emitting blue or ultraviolet light and a color conversion unit (2, 5) for converting said blue or ultraviolet light into visible light comprising at least two sections (2a, 2b, 2c, 6a, 6b, 6c, 6d), at least one section (2c, 6d) of which being a transparent or translucent color converting section, said color conversion unit (2, 5) being arranged for alternately illuminating said at least two sections (2a, 2b, 2c, 6a, 6b, 6c, 6d) with said blue or ultraviolet light, said at least one color converting section containing luminescent material, wherein said luminescent material is a luminescent organic dye in a polymer matrix or a crystalline inorganic luminescent material.
摘要:
The invention relates to a light application apparatus (1) for applying light to an object (3). A light source (4) generates processing light (2) and sensing light (5), which are coupled into the object (3). A light detector (8) detects the sensing light (5) after having left the object (3), and a control unit (9) controls the light source (4) such that processing light (2) in a processing time interval and sensing light (5) in a sensing time interval are alternately generated. Since processing light and sensing light are generated alternately, the generation of the processing light and of the sensing light is decoupled, i.e. the processing light can be optimized for processing purposes and the sensing light can be optimized for sensing purposes. This allows improving the quality of sensing the object and, thus, the quality of controlling the application of light depending on properties of the object.
摘要:
This invention relates to a color controlled light source comprising a plurality of colored light elements; a detector for detecting the light output of the light source and generating a detection signal; and a color control unit for generating driving signals to said light elements on the basis of said detection signal and a predetermined target color point of the light output of the light source. In order to enable detection of contributions from individual light elements to the light output of the light source, the light source further comprises a modulator for individual signature modulation of the driving signal to each one of said light elements; and a corresponding demodulator for demodulation of said detection signal and generation of actual, i.e. measured, values of the output of the individual light elements. The color control unit determines nominal values of the light output of each light element for obtaining said target color point, and compares the actual values with the nominal values. If there is a difference, it adjusts the driving signals in order to minimize the difference.
摘要:
The invention describes a system for controlling a shading device with a plurality of controllable shading elements. To provide a system for controlling a shading device, which reduces direct sunlight transmission and enhances thermal comfort and lighting conditions, the system comprises at least one detector unit for providing an image signal of a shading area and a control unit (5) being configured to receive said image signal, determine from said signal, whether a characteristic pattern is present in said shading area and in case said characteristic pattern is determined, control said shading elements to reduce said characteristic pattern.
摘要:
The present invention describes a winding for a transformer comprising first (60) and second (70) planar sections which are arranged parallel to each other. First (1, e.g., from 602 to 603)) and second (2, e.g., from 703 to 704)) current paths are arranged on the first and second planar sections. The first and second current paths are connected to each other by means of an interconnection (603/703). The first and second current (603/703) paths are respectively angled with respect to a direction along which the first and second planar sections are extending.
摘要:
A lighting device for generating colored and white light. According to the invention the lighting device comprises at least one light source (1, 4) emitting blue or ultraviolet light and a color conversion unit (2, 5) for converting said blue or ultraviolet light into visible light comprising at least two sections (2a, 2b, 2c, 6a, 6b, 6c, 6d), at least one section (2c, 6d) of which being a transparent or translucent color converting section, said color conversion unit (2, 5) being arranged for alternately illuminating said at least two sections (2a, 2b, 2c, 6a, 6b, 6c, 6d) with said blue or ultraviolet light, said at least one color converting section containing luminescent material, wherein said luminescent material is a luminescent organic dye in a polymer matrix or a crystalline inorganic luminescent material.