Abstract: Following the trend of IoT, more and more sensors and/or to network devices may be connected to a control network. This enables more advanced functionality but also may result in contradictory control commands being generated by different network devices. A distributed master control device election method, and the related system and devices, are disclosed. Among others a control device (200, 200a, 200b, 200c) is disclosed to connect to a control network (110), it sends a local beacon message with information on a local hierarchy level associated with the control device itself within a first period of time, to announce the presence of the control device to devices on the network, and monitors the network (110) during the first period of time for detecting potential beacon messages from other devices on the network.

Abstract: A Digital Addressable Lighting Interface, DALI, enabled communication device for transmitting messages over a communication bus having two communication lines, said device comprising a switch connected between said two communication lines, a controller arranged for controlling said switch for imposing logical communication levels on said communication bus, an energy storage device, connected in series with said switch, and arranged for storing electrical energy flowing from said bus through said switch, a bypass circuit arranged for bypassing said energy storage device when a voltage over said energy storage device is above a predetermined voltage threshold.

Abstract: In one aspect, a device is adapted to transmitting power to, or receive power from, a remote device over first and second communication lines (DALI+, DALI?) and to communicate with the remote device over the first and second communication lines. A first driver implements a first communications protocol which comprises coupling the first and second communication lines together to encode a first signal level and isolating the first and second communication lines from each other to encode a second signal level. This may be a DALI protocol. A second driver implements a second communications protocol which comprises modulating the first communication line with a signal having a low modulation depth. The second communications protocol means there is always a voltage difference between the two communication lines to enable continuous power harvesting. A second aspect relates to efficient power transfer by disabling a current limiter function, when possible.

Abstract: A Light Emitting Diode, LED, based lighting device arranged to emit colored light, wherein said LED based lighting device comprises a first LED channel comprising at least one LED arranged for emitting light at a first color, a second LED channel comprising at least one LED arranged for emitting light at a second color, said second color being different to said first color, a controller arranged for activating said first LED channel and said second LED channel based on a color ratio such that said LED based lighting device emits light having a particular color, wherein said controller is further arranged for correcting said color ratio based on aging of said at least one LED in said first LED channel and on said at least one LED in said second LED channel, thereby ensuring color consistency of said particular color of said LED based lighting device over time.

Abstract: A system is created for an efficient dimming LED lighting system, and comprising a voltage source, an electronic switch controlled by a pulse width modulation, PWM, driving signal and an LED lighting module connected in series. The LED comprises an LED group and a constant current drive circuit to drive a constant current through the LED group. The voltage source and a bypass branch, which is connected in parallel with the electronic switch, is adapted such that when the electronic switch is open, a power delivered to the constant current drive circuit is sufficient to maintain operation of the constant current drive circuit, ensuring capability for a deep dimming.

Abstract: Apparatus, methods and systems are disclosed related to negotiation mechanism among control devices (200, 200a, 200b, 200c, 200d) each having a dedicated hierarchy level configured to obtain DC current from the control network (100) with at least a power source (300, 300?) on the network (100). The control device (200, 200a) with a higher dedicated hierarchy level may request another control device (200b, 200c, 200d) with a lower dedicated hierarchy level to release current for its use, when the available current at the power source (300, 300?) is not sufficient.

Abstract: A driver for driving a load, the driver comprising a power converter for converting an input to an output for powering the load, a controller for controlling the output of the power converter by controlling a control voltage on a communication line provided in between the power converter and the controller, wherein the controller is arranged to control the control voltage to be within a predetermined control voltage range, wherein the power converter is further arranged for communicating from the power converter to the controller by controlling the control voltage on the communication line to be outside of the predetermined control voltage range.

Abstract: A mechanism for performing a communication using a visible light communication (VLC) protocol. The mechanism proposes to modulate a bus voltage provided to all lighting elements (comprising LED elements) of a lighting unit, so that the magnitude of light emitted by all lighting elements is modulated according to a same modulation scheme. A lighting system having a plurality of lighting elements is also proposed.

Abstract: The invention relates to a lighting system comprising a load comprising a parallel configuration of a first LED load having a first forward voltage, and a first switch coupled in series with the first LED load; and a second LED load, having a second forward voltage being different than the first forward voltage; a switched mode power supply comprising a switching element; an inductor; a diode; a set of output pins for coupling to the load; and a capacitor coupled across the set of output pins; wherein the switched mode power supply is arranged to provide a voltage across the set of output pins, wherein the lighting system comprises a further inductor coupled between the one of the output pins and the load.

Abstract: A driver for driving a load, the driver comprising a power converter for converting an input to an output for powering the load, a controller for controlling the output of the power converter by controlling a control voltage on a communication line provided in between the power converter and the controller, wherein the controller is arranged to control the control voltage to be within a predetermined control voltage range, wherein the power converter is further arranged for communicating from the power converter to the controller by controlling the control voltage on the communication line to be outside of the predetermined control voltage range.

Abstract: A system is created for an efficient dimming LED lighting system, and comprising a voltage source, an electronic switch controlled by a pulse width modulation, PWM, driving signal and an LED lighting module connected in series. The LED comprises an LED group and a constant current drive circuit to drive a constant current through the LED group.

Abstract: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

Abstract: In one aspect, a device is adapted to transmitting power to, or receive power from, a remote device over first and second communication lines (DALI+, DALI?) and to communicate with the remote device over the first and second communication lines. A first driver implements a first communications protocol which comprises coupling the first and second communication lines together to encode a first signal level and isolating the first and second communication lines from each other to encode a second signal level. This may be a DALI protocol. A second driver implements a second communications protocol which comprises modulating the first communication line with a signal having a low modulation depth. The second communications protocol means there is always a voltage difference between the two communication lines to enable continuous power harvesting. A second aspect relates to efficient power transfer by disabling a current limiter function, when possible.

Abstract: A Light Emitting Diode, LED, based lighting device arranged to emit colored light, wherein said LED based lighting device comprises a first LED channel comprising at least one LED arranged for emitting light at a first color, a second LED channel comprising at least one LED arranged for emitting light at a second color, said second color being different to said first color, a controller arranged for activating said first LED channel and said second LED channel based on a color ratio such that said LED based lighting device emits light having a particular color, wherein said controller is further arranged for correcting said color ratio based on aging of said at least one LED in said first LED channel and on said at least one LED in said second LED channel, thereby ensuring color consistency of said particular color of said LED based lighting device over time.

Abstract: Apparatus, methods and systems are disclosed related to negotiation mechanism among control devices (200, 200a, 200b, 200c, 200d) each having a dedicated hierarchy level configured to obtain DC current from the control network (100) with at least a power source (300, 300?) on the network (100). The control device (200, 200a) with a higher dedicated hierarchy level may request another control device (200b, 200c, 200d) with a lower dedicated hierarchy level to release current for its use, when the available current at the power source (300, 300?) is not sufficient.

Abstract: The invention relates to a lighting system comprising a load comprising a parallel configuration of a first LED load having a first forward voltage, and a first switch coupled in series with the first LED load; and a second LED load, having a second forward voltage being different than the first forward voltage; a switched mode power supply comprising a switching element; an inductor; a diode; a set of output pins for coupling to the load; and a capacitor coupled across the set of output pins; wherein the switched mode power supply is arranged to provide a voltage across the set of output pins, wherein the lighting system comprises a further inductor coupled between the one of the output pins and the load.

Abstract: Following the trend of IoT, more and more sensors and/or to network devices may be connected to a control network. This enables more advanced functionality but also may result in contradictory control commands being generated by different network devices. A distributed master control device election method, and the related system and devices, are disclosed. Among others a control device (200, 200a, 200b, 200c) is disclosed to connect to a control network (110), it sends a local beacon message with information on a local hierarchy level associated with the control device itself within a first period of time, to announce the presence of the control device to devices on the network, and monitors the network (110) during the first period of time for detecting potential beacon messages from other devices on the network.

Abstract: A Digital Addressable Lighting Interface, DALI, enabled communication device for transmitting messages over a communication bus having two communication lines, said device comprising a switch connected between said two communication lines, a controller arranged for controlling said switch for imposing logical communication levels on said communication bus, an energy storage device, connected in series with said switch, and arranged for storing electrical energy flowing from said bus through said switch, a bypass circuit arranged for bypassing said energy storage device when a voltage over said energy storage device is above a predetermined voltage threshold.

Abstract: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

Abstract: The invention provides a lighting system and a lighting control component for such a system. The components are battery-operated, and include a remote control signal receiver for receiving commands and configurations during commissioning. A disabling system is provided for enabling and disabling the remote control signal receiver, such that the remote control signal receiver is enabled when a commissioning process of the lighting system is expected and disabled when a commissioning process of the lighting system is not expected. This reduces the power consumption of the component after the commissioning is complete but provides ease of use during commissioning.