Koninklijke Philips Corporation N.v.

Signify Holding B.v.

Philips Lighting Holding B.v.

Koninklijkle Philips N.v.

Koninklijke Philips Electronics N.v.

Ulrich Boeke

Matthias Wendt

Peter Luerkens

Harald Josef Günther Radermacher

Carsten Deppe

Joseph Hendrik Anna Maria Jacobs

Eduard Gerhard Zondag

Eberhard Waffenschmidt

Dirk Hente

Lennart Yseboodt

Christian Hattrup

Jeroen Hubert Christoffel Jacobus Stessen

Hubert C Raets

Eugen Jacob De Mol

Machiel Antonius Martinus Hendrix

Paul Theodorus Jacobus Boonen

Nebojsa Fisekovic

Chenyang Liu

Leenart Yseboodt

Franciscus Johannes Stommels

A driver for driving a load, wherein the driver comprises a dual-boost converter comprising an output capacitance comprising a first output capacitor connected in series with a second output capacitor, a first switch connected to a power input stage via a first inductor and arranged for controlling charging of said first output capacitor via a first diode and a second switch, connected in series with said first switch, and connected to the power input stage via a second inductor and arranged for controlling charging of said second output capacitor via a second diode; wherein a centre tap of said in series connected first and second output capacitor is connected to a centre tap of said in series connected first and second switch.

Driver for a load, as well as a corresponding light emitting diode, LED, based lighting device and a method

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. In the first mode an output connection is formed between the output node and the second output of the rectifier circuit, the first switch is arranged to operate as a buck converter switch, the second switch is arranged to operate as a synchronous freewheel switch. In the second mode an output connection is formed between the first output of the rectifier circuit and the output node, the first switch is arranged to operate as the synchronous freewheel switch, the second switch is arranged to operate as a buck converter switch and wherein the controller is arranged to receive a mode control signal for operating the buck converter in the first mode or the second mode.

Universal buck converter

The invention relates to a user interface device () coupleable to a control unit () via a connection cable () comprising at least one optical fiber for transporting light. The user interface device () comprises a light inlet opening () configured to receive light from a region outside a housing () of the device () and to couple the received light into the first optical fiber () for transmitting the light to the control unit () when the user interface device () is switched off. Moreover, the invention relates to a control unit () coupleable to the user interface device () via the connection cable (). The control unit () is configured to detect changes of the light received via the first optical fiber () and to activate power supply to the user interface device () to switch on the user interface device () based upon the detected changes.

Optical wake-up detection for a user interface device

A lighting driver is designed for driving an unknown lighting load and is based on a controlled DC driver, with a controlled output current. It is used in a first mode of operation to determine an operating current of the lighting load and in a second mode of operation to deliver a current to the lighting load in dependence the determined operating current, and optionally also in dependence on a dimming setting. In this way, the driver configures its output to the load based on an analysis of the current characteristics of the load, such as the maximum rated current.

Lighting driver, lighting circuit and drive method

The present invention relates to a Power over Ethernet system () which supports additional optical communication via optical fibres. The powered devices (d, d, d) may comprise circuitry to process optical signals, in particular triggering activation of the powered device (d, d, d) after being in a low power state. The power supplying devices (s-s) may relay optical signals via direct optical paths. Optical paths in the network may improve timing accuracy of applications. The overall power consumption of the system may be improved in particular during low activity situations in which the system is primarily used for data communication. The additional optical communication paths may provide redundant paths and thus may increase the network's robustness.

Optical fibre enhanced PoE network

The invention relates to a PSE device () to be used in a PoE lighting system (), wherein the PSE device () is adapted to receive input power from a power providing system (). The PSE device () comprises a power detection unit for detecting whether the received input power is primary input power or backup input power, wherein the PSE device () is adapted to control the power consumption of lighting units () depending on the power detection. This allows for an indication of an emergency situation, in which the backup input power is provided, to the PSE device () without necessarily requiring data communication means. Moreover, the power consumption of the lighting units () can be more efficiently utilized in case of emergency.

Power source equipment device for a power over ethernet lighting system

The invention relates to a management unit () and a method for operating such a unit in a Power-over-Ethernet (PoE) installation. The management unit () comprises at least one first port () to which an external device () can be connected, and it is adapted to control the power delivered at a first port () in dependence on predetermined switching rules.

Management of power-over-ethernet installation

Described is a management unit () and a method for operating such a unit in a Power-over-Ethernet (PoE) installation. The management unit () comprises at least one first port () to which an external device () can be connected, and it is adapted to control the power delivered at a first port () in dependence on predetermined switching rules.

The present invention relates to a load control system in which a power cable of a DC or AC is used for on/off control and dimming of connected load devices without adding significant hardware structure. The control is achieved through a change in the DC or AC bus voltage. A grid controller can perform on/off control and dimming for an entire group of connected load devices by changing the bus voltage. Connected load devices that do understand or want to make use of this feature will be unaffected. In order to reduce the effects of voltage drop, a calibration procedure is provided. The calibration procedure first triggers the connected load devices into a calibration mode and then initiates a number of predefined output level commands that allow the load devices to build an individual correction for the undesired voltage drop.

Signal-level based control of power grid load systems

The present invention relates to a rectifying method and circuit using a magnetically coupled double flyback converter. The main circuit can consist of only one transformer, two switches, two low frequency diodes, two high frequency diodes and two capacitors, so that power is inherently distributed according to the demand on the two DC phases and a sinusoidal grid current can be obtained without sophisticated control.

Rectifying circuit and method for an unbalanced two phase DC grid

The present invention relates to a power converter architecture and its operation principle that supplies an electric load with a controlled direct voltage from both a local direct current electricity source as well as an alternating current (AC) mains with maximum power conversion efficiency. For the case that the local electricity source can not provide enough electricity to the local load it is additionally supplied with electricity from the AC mains. In other case electricity is also feed into the AC grid when a local source can provide more electricity than needed to supply local loads.

Controlled converter architecture with prioritized electricity supply

A lighting system comprises a plurality of lighting units () each configured to light a target area. A central dimming element having an adjustable conductance is provided. Each lighting unit comprises at least one light source (), a controllable light source driver () coupled to the light source (), and a light sensor () configured to measure a light flux in the target area of the lighting unit (). The light source driver supplies power to the light source in accordance with an input control voltage generated by a current source. The light sensor is coupled to the current source, and has a variable conductance corresponding to the light flux. The lighting units () can be dimmed in combination by coupling each light sensor () in parallel to the dimming element () through a respective diode ().

Dimming of lighting system

The present invention relates to an electronic driver circuit and a corresponding method for supplying an electronic load (LED, LED, . . . , LEDn) with a DC current or voltage (Vload). To achieve a high efficiency and a low thermal stress on the electronic load, the proposed driver circuit comprises: &#x2014;an AC input (L, N) for receiving an AC input voltage (V), two buck-boost converters () for alternately operating as rectifier for rectifying said AC input voltage (V) and as DC/DC converter for DC conversion of said rectified AC input voltage, a control unit () for monitoring the zero crossing of the AC input voltage (V) and for controlling said two buck-boost converters () to change their modes of operation upon detection of a zero crossing, such that during all periods one buck-boost converter operates as rectifier and the other buck-boost converter operates as DC/DC converter.

Electronic driver circuit and method

In order to further develop a circuit arrangement () as well as a method for generating at least one drive signal for at least one synchronous rectification switch of at least one flyback converter in such way that an improved and simpler thermal management can be combined with a significant cost reduction as well as with a higher efficiency, it is proposed to generate the drive signal for said synchronous rectification switch as a function of at least one oscillating signal controlling the synchronous rectification switch, of at least one constant delay time, of at least one variable delay time, and of at least one Boolean OR function.

Generating drive signals for a synchronous rectification switch of a flyback converter

Supply circuits for supplying voltage and current signals to light sources () comprise switches () and controllers () to control the switches () for reducing values of frequency components of harmonic content of power spectra of the light sources (). By switching one of the voltage and current signals or by switching signals that result in one of the voltage and current signals, the other one of the voltage and current signals can be adjusted. The power spectrum of the light source () may be a function of the voltage and current signals. By adjusting one of them, the power spectrum can be adjusted such that values of frequency components of the harmonic content of the power spectrum are reduced. As a result, visible flicker is reduced in the light originating from the light source () without the use of energy storage capacitors for reducing this visible flicker.

Growing community of inventors

Langerwehe, Germany

Ulrich Boeke