Elmos Semiconductor Se

Andre' Krieger

Christian Schmitz

Carsten Leitner

Thomas Geistert

A device includes a voltage regulator, circuits, and a current bus. Each of the circuits includes at least one LED driver. The voltage regulator supplies electrical energy to a plurality of LED groups. Each of the circuits includes a voltage measuring circuit for detecting voltage drops across the LED drivers. The LED drivers set the currents through the LED groups. Each of the circuits includes a local controller. The local controller withdraws a current from the control bus in dependence on the detected voltage drops of the LED drivers included in the circuit. A bias current source injects a bias current into the control bus. The control bus sums the currents in the current bus. The output of the regulator is controlled based on the summed current.

Method and apparatuses for controlling the output voltage of a voltage regulator

A device comprises a voltage regulator, circuits, a voltage-to-current converter, a control bus, a resistor and a resistor network. Each of the circuits has at least one LED connector and one LED driver. Each of the circuits has a measuring circuit for detecting voltage differences between the potentials of LED terminals and a reference potential. Further, each of the circuits includes a local controller. The local controller withdraws a current from the control bus in dependence on the detected voltage differences. Bias current sources inject bias currents into the control bus in form of a sum current of the injected bias currents. The resistor performs a current-to-voltage conversion of the sum current to a control voltage. The voltage-to-current converter converts the control voltage into a current. The resistor network converts the current into a voltage value. An output voltage of the voltage regulator depends on the voltage value.

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Berlin, Germany

Andre' Krieger