Philips Lighting Holding B.v.

Signify Holding B.v.

Lino Adriaan Nicolaas Wilhelm De Wit

Harald Josef Günther Radermacher

Peter Hubertus Franciscus Deurenberg

Klaas Jacob Lulofs

Geert Willem Van Der Veen

Patrick Alouisius Martina De Bruycker

Tijmen Cornelis Van Bodegraven

Wilhelmus Josephus Cornelissen

Casper Willem Johannes Kemper

An LED driver control circuit suitable for a LED driver operating under the Line Switch dimming protocol. The LED driver control circuit generates a control signal that can switch between a voltage level at a first node and a voltage level at a second node. The first node is connected to a three-phase input by a first voltage control circuit and the second node is connected to the three-phase input a second voltage control circuit. The first voltage control circuit controls the voltage level at the first node to be, in a first embodiment, greater than or, in a second embodiment, less than a voltage level of each phase of the 3-phase input for at least part of a cycle of the respective phase. The second voltage control circuit controls the voltage level at the second node to be, in the first embodiment, less than or equal to or, in the second embodiment, greater than or equal to a voltage level of each phase of the 3-phase input for the entirety of the cycle of the respective phase.

LED driver control circuit

The invention relates to a LED lighting system comprising a power supply circuit and at least one LED module. The power supply circuit comprises input terminals (K, K) for connection to a supply voltage source and output terminals (KK),and a driver circuit (I, II) coupled between the input terminals and the output terminals for generating a LED current out of a supply voltage supplied by the supply voltage source, and comprising a driver control circuit (II) with an input terminal (K) for receiving a current control signal and for generating a LED current in dependency of the current control signal. The at least one LED module comprises input terminals (K, K) for coupling to the output terminals of the power supply circuit, a LED load (LS) coupled between the input terminals, and a module control circuit for generating a current control signal as a square wave shaped signal comprising a first part having a first amplitude during a first time lapse representing a desired magnitude of the LED current, said module control circuit comprising an AC coupling of the current control signal to the input terminal of the driver control circuit.

LED lighting system

The invention relates to LED lighting system comprising a power supply circuit and one or more LED modules. The power supply circuit is equipped with input terminals (K, K) for connection to a supply voltage source and first and second output terminals (K, K), and a driver circuit (I, II) coupled between the input terminals and the first and second output terminals for generating a LED current. The driver circuit (I, II) comprises a driver control circuit (II) equipped with an input terminal (K) for increasing or decreasing the LED current in dependency of a signal present at the input terminal of the driver control circuit. The one or more LED modules comprise first and second input terminals (K, K) for connection to respectively the first and second output terminals of the power supply circuit, a series arrangement of a LED load (LS) and a current sensor (R) coupled between the input terminals, a module control circuit for generating a current control signal at an output terminal of the module control circuit and coupled to the current sensor and to a reference signal generator (R, R, R, Z) for generating a reference signal representing a desired magnitude of the LED current, wherein the current control signal has a first value in case the desired value of the LED current is lower than the measured value of the LED current and a second value in case the desired value of the LED current is higher than the measured value of the LED current, and coupling circuitry (D; Sg, DC, C, C) coupled during operation between the output terminal of the module control circuit and the input terminal of the driver control circuit, for communicating the first value of the current control signal to the input terminal of the driver control circuit and for blocking the second value, and wherein the signal at the input terminal of the driver control circuit has a default value when all the current control signals have their second value.

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Eindhoven, Netherlands

Lino Adriaan Nicolaas Wilhelm De Wit