Signify Holding B.v.

Karnekumar Arulandu

Haimin Tao

Matthias Wendt

Harry Broers

Aleksandar Sevo

Johan Paul Marie Gerard Linnartz

Johannes M Van Meurs

Cornelis Antonius Verbakel

Jan Ekkel

Christian Jordan

Johannes Adrianus Cornelis Misdom

Andreas Felix Alfred Bluschke

Amir Masood Khalid

Johannes Maria Van Meurs

A power converter for compensating voltage variation in a circuit, the circuit comprising: a power stage arranged for receiving a mains input and for converting the mains input into a direct current, DC, output for driving a load; and a first buffer capacitor connected in a parallel branch with the load; wherein the power converter comprises an output capacitor connected in series with the first buffer capacitor, wherein the output capacitor is arranged for connecting in series with the first buffer capacitor in said parallel branch with the load; wherein the power converter comprises a second buffer capacitor arranged for connecting in series with the first buffer capacitor; and wherein the power converter is configured to charge the output capacitor from the second buffer capacitor, when the DC output is below a predetermined threshold.

Low power converter for compensating mains voltage variation

High-speed optical communication is very attractive to satisfy high throughput applications. In the meanwhile, it is also desirable to reduce the energy waste resulted from an idle state of the optical transceivers of the communication system. The present invention discloses that both the access point () and the end point device () can operate in at least two different operation states, a normal operation state and a low power state. The low power state is a default state, and the normal operation state is enabled only when a valid trigger is detected. To establish a high-speed optical link (), the end point device () first sends an optical trigger signal () to the access point () in the low power state. The access pint () switches to the normal operation state only when a valid trigger signal is identified after detecting the optical trigger signal ().

Trigger-based optical wireless communication system

A bias circuit () of an avalanche photodiode, APD, comprising: a voltage conversion module () connected to the APD, wherein the voltage conversion module () is configured to convert an input supply voltage (Vin) to a bias voltage for the APD; an error amplifier () connected to the voltage conversion module () for implementing a feedback control; a voltage feedback loop () configured to provide the error amplifier () a first analog signal related to the bias voltage; and a current feedback loop () configured to provide the error amplifier () a second analog signal related to the APD current; wherein the error amplifier () is configured to control the voltage conversion module () based on the first and the second analog signals.

APD bias circuit with dual analog feedback loop control

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

LiFi power management

A lighting unit which includes a driver, a light source and a buffer capacitor of an auxiliary circuit (such as an independent active electronic circuit). The charging current allowed to flow to the buffer capacitor is controlled based on sensed currents flowing to the light source thereby to control the charging current of the buffer capacitor. In this way, large inrush currents caused by the use of a large buffer capacitor at the output of the driver can be avoided and the triggering of a fault detection mode within the driver can be prevented. Furthermore this circuit ensures that the driver is operated within the specification limits during start-up.

Lighting unit and driving method

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BREDA, Netherlands

Karnekumar Arulandu