Abstract: A node (200) is provided for use in a LiFi system (100) to provide LiFi signals to an endpoint device (130). The node (200) comprises a visible light source (220) for emitting modulated visible light and non-modulated visible light to provide illumination, and an infrared light source (210) for emitting modulated infrared light. The node (200) is configured to output a LiFi signal at a first one or more frequencies via the infrared light source (210) for reception by said endpoint device (130). In response to receiving input to provide illumination, the node (200) turns on the visible light source (220) to provide said illumination and automatically transfers an output of the LiFi signal from the infrared light source (210) to the visible light source (220) by outputting the LiFi signal at said first one or more frequencies via the visible light source (220) for reception by said endpoint device (130), and turning off the infrared light source (210).

Abstract: Radar-based motion detection systems are widely used in smart home, smart building, and smart city area for automatic control. In this invention, methods, subsystem, systems, computer program are disclosed to achieve power reduction of a radar sensor by operating the radar sensor in a sub-sampling manner in an illumination control system. By combining the information related to the detection area and the state of a lighting device, the sampling frequency of a radar sensor is configured according the user scenario. A balance between power reduction and motion detection performance is achieved therefrom.

Abstract: The invention relates to a monitoring system (13) for monitoring electrical devices (A, B, C, D, K) like luminaires. An assignments providing unit (7) provides assignments between the electrical devices and behavior classes defining expected behaviors, wherein a deviation determination unit (9) determines a deviation a) between a monitored behavior of an electrical device assigned to a behavior class and an expected behavior defined by a behavior class and/or b) between a monitored behavior of an electrical device and a monitored behavior of another electrical device, wherein an output unit (10) provides an output depending on the determined deviation. The deviation can be indicative of a commissioning error, i.e., for instance, of an assignment of an electrical device to a wrong room within a building. The monitoring system can therefore allow for an automatic detection of commissioning errors in a building which may have thousands of electrical devices.

Abstract: The invention provides a vapor chamber element (1000) comprising a first part (1100), a second part (1200), and a third part (1300), wherein the second part (1200) and third part (1300) are associated to the first part (1100), wherein the second part (1200) and third part (1300) are configured spatially separated with a first distance (d1) along a first length (L1), defining an opening (200) between the second part (1200) and the third part (1300); wherein the vapor chamber element (1000) comprises one or more vapor chambers (100) at least partially comprised by the second part (1200) and third part (1300); wherein the vapor chamber element (1000) further comprises one or more heat fin elements (2000), wherein the one or more heat fin elements (2000) comprise one or more heat fins (2100), wherein the one or more heat fin elements (2000) bridge the first distance (d1) and close a part of the opening (200).

Abstract: An inverter circuit receives an AC input signal and uses at least two bidirectional switches between the input terminals and a junction node to perform the electrical inversion function. A resonant circuit is formed by a primary side inductor between the junction node and a second node and a capacitor arrangement between the second node and the input terminals.

Abstract: A method (50) of, a node device (100) and a computer program product arranged for alerting node devices in a network of operatively interconnected node devices by transmitting an alerting message comprising a geographic location address of an originator node device (21) transmitting the alerting message and a moving direction (12) of an object (11) receiving service from the originator node device (21). When a receiving node device (24, 25) determines, based on its geographic location address, the geographic location address of the originator node device (21) and the moving direction (12), that the object (11) is approaching the receiving node device (24, 25), it transmits the alerting message comprising the geographic location address of the originator node device (21) and the moving direction (12).

Abstract: The invention relates to a buck converter comprising an input for receiving an input voltage, an output node for providing an output voltage to a load, a rectifier circuit coupled to the input, a first switch coupled between a first output of the rectifier circuit and a switching node, a second switch coupled between the switching node and a second output of the rectifier circuit, an inductor coupled between the switching node and the output, a first capacitor coupled between the first output of the rectifier and the output, a second capacitor coupled between the output and the second output of the rectifier and a controller. The controller controls the first switch and the second switch and arranged to operate the buck converter in a first mode and a second mode.

Abstract: A light guide (1) for a lighting device (8) is provided. The light guide (1) comprises an incoupling element (2) configured for receiving light and coupling the received light into the light guide (1). The light guide (1) is configured to convey the received light within the light guide (1). The light guide (1) comprises at least a first group and a second group of conically shaped outcoupling surface structures (3) distributed on, and recessed into or protruding from, a side (4) of the light guide (1). Each conically shaped outcoupling surface structure (3) is configured for coupling of light out of the light guide (1). Further, each conically shaped outcoupling surface structure (3) of the first group is geometrically characterized by a shape in accordance with a first cone or conical frustum (5) and each conically shaped outcoupling surface structure (3) of the second group is geometrically characterized by a shape in accordance with a second cone or conical frustum (6).

Abstract: In a LiFi network with multiple coordinators, interference in the overlapping areas between the local parts of the network can occur if each coordinator determines its own local time schedule for communicating with devices. To solve this problem, the invention proposes cooperation between the coordinators to determine non-interfering local time schedules whereby the coordinators rely on interference reports from the devices in the overlapping areas and apply a small number of simple rules. The proposed method is simple, scalable and independent from a central unit.

Abstract: Because of the line-of-sight character of optical wireless communication and a limited field-of-view of optical receivers, the coverage of an access point and the overlapping coverage area of adjacent access points in an optical system are smaller as compared to a RF system. It turns more challenging to support an end point (110) to roam securely in an optical multi-cell wireless communication network. To speed up the derivation of a new pairwise transient key with a new access point during a handover procedure, the end point of this invention comprises a controller (118) that is configured to act as a second supplicant (1181), on behalf of a first supplicant (1186) comprised in a host processor (1185), to communicate with an authenticator to establish a new pairwise transient key for the end point (110) and a candidate access point, and an active pairwise transient key with the currently associated access point is used to secure the communication for new key derivation.

Abstract: A light emitting device (1) adapted for projecting a light beam (15) onto a target surface, the light emitting device (1) comprising a light engine (2) comprising a light source (3), a light mixing chamber (4), and an optical component (5) having a spherical shape with a curved light-receiving surface (51), where the light source (3) is arranged to, in operation, emit light towards a light exit window (41) of the at least one light mixing 5 chamber, the light exit window (41) of the at least one light mixing chamber (4) thereby acting as an extended light source with a curved light-emitting surface, where the optical component (5) is provided adjacent to the light exit window (41) of the light mixing chamber, and where the curved light emitting surface of the at least one light mixing chamber (4) is conformal to an the curved light-receiving surface (51) of the optical component (5) and 10 coincident with a focal surface (52) of the optical component (5).

Abstract: The invention provides a light generating system (1000) comprising a LED module (100), a module support (200), and a connector element (300), wherein: the module support (200) comprises a first module support opening (230) for hosting at least part of a first connector element part (310); the LED module (100) comprises a LED support (120) and a plurality of LEDs (10) functionally coupled to the LED support (120), wherein the LED support (120) comprises a LED support opening (130) for hosting at least part of the first connector element part (310); and wherein the plurality of LEDs (10) are configured to generate light source light (11); the connector element (300) comprises the first connector element part (310), and wherein the first connector element part (310) comprises a first spring part (315); at least part of the first connector element part (310) penetrates through the first module support opening 230); and the LED support opening (130), the first connector element part (310), and the module support (

Abstract: A connection system is provided for modular luminaires, wherein the luminaires are each provided with at least one tapered pillar projecting from a back, the pillar having a top opening. A coupling arrangement is used for coupling the two luminaires together, in the form of a bridge having first and second tapered openings for fitting over the pillars. A sprung retaining clip projects within each opening for passing through the top opening and thereby gripping the pillar.

Abstract: The invention provides a lighting device (1000) comprising: —a first light source (110) configured to generate first light source light (111), having a first light source light spectral power distribution, wherein the first light source (110) comprises a laser light source (10), and wherein the first light source light (111) has an optical axis (0); —a first converter material (215), comprising a first luminescent material (210), configured to convert at least part of the first light source light (111) into first luminescent material light (211) having a first luminescent material light spectral power distribution, wherein the first luminescent material light (211) has one or more wavelengths in the green and/or yellow wavelength range; —a second converter material (225), comprising a second luminescent material (220), configured to convert part of the first luminescent material light (211) into second luminescent material light (221) having a second luminescent material light spectral power distribution diff

Abstract: A light fixture (100) includes a carriage (104), a hood (102) rotatably attached to the carriage (104), and a light engine (150, 900, 1108) that includes a plate (110, 902) and a light module (112, 926). The light module (112, 926) is attached to the plate (110, 902), and the plate (110, 902) is rotatably attached to the carriage (104).

Abstract: An LED based lighting device capable of Radio Frequency communication, said LED based lighting device comprising a driver board comprising a mains input connector, an LED output connector and an LED driver, wherein said LED driver is arranged for receiving a mains power supply, via said mains input connector, and for providing an LED current to an at least one LED, via said LED output connector, an LED board comprising an LED input connector, an antenna and said at least one LED, an interconnect cable connecting said driver board to said LED board via said LED output connector and said LED input connector, wherein said driver board further comprises an RF module arranged for generating an RF signal and for superimposing said generated RF signal on said LED current such that said RF signal is conveyed over said interconnect cable to said antenna.

Abstract: A lighting unit (102) is disclosed. The lighting unit comprises: one or more light sources (110), a memory (108), a communication unit (104) comprising a first communication module (104a) configured to communicate via a first wireless communication technology, and a second communication module (104b) configured to communicate via a second wireless communication technology, and a processor (106) configured to receive, via the first communication module (104a), a first lighting control command (122), store the first lighting control command (122) in the memory (108), receive, via the second communication module (104b), a second lighting control command (124), and control the one or more light sources (110) according to the first lighting control command (122) upon receiving the second lighting control command.

Abstract: The invention provides a printed circuit board assembly (1) comprising (i) an at least partly folded flexible printed circuit board (100), and (ii) an at least partly folded support (200), wherein: —the at least partly folded flexible printed circuit board (100) comprises a first PCB region (110) and a second PCB region (120), wherein at least part of the second PCB region (120) is configured folded over at least part of the first PCB region (110); —the at least partly folded support (200) is configured to support at least part of the at least partly folded flexible printed circuit board (100), wherein the at least partly folded support (200) comprises a first support region (210) and a second support region (220), wherein at least part of the second support region (220) is configured folded over at least part of the first support region (210), wherein at least part of the at least partly folded flexible printed circuit board (100) is configured between the first support region (210) and the second support re