A CURRENT SUPPLY SYSTEM AND A METHOD OF OPERATING SAID CURRENT SUPPLY SYSTEM

• Main Authors: POLISI, Vincenzo, TRECARICHI, Calogero Andrea, BARTHEL, Jochen, TAGLIAVIA, Donato, MAMMOLITI, Francesco Nino, BERAN, Ludek
• Format: Patent
• Language: English; French; German
• Published: 25.05.2022
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

A current supply system for strings of solid-state light sources (34) is disclosed. The current supply system comprises a plurality of terminals (OUT1..OUTn), wherein each of the terminals (OUT1..OUTn) is configured to be connected via a respective current regulator or limiter (32) to a first output terminal of a voltage source (20) and via a respective string of solid-state light sources (34) to a second output terminal of the voltage source (20). A control circuit (40) is configured to generate a reference signal (Vref) for the voltage source (20), wherein the reference signal is indicative of a requested output voltage (Vout) to be generated by the voltage source (20) between the first and the second output terminals of the voltage source (20).In particular, the control circuit (40) comprises:- a digital feed-forward control circuit (408, 410, 412) configured to compute a digital feed-forward regulation value (Vout_req) indicative of a requested output voltage by determining a maximum voltage drop (VLED_MAX) at the strings of solid-state light sources (34),-a digital feed-back control circuit (414) configured to determine (1030) a minimum voltage drop (V32_MIN) at the current regulators or limiters (32) and determine a digital feed-back correction value as a function of the minimum voltage drop (V32_MIN), and- a control circuit (40) configured to set the reference signal (Vref) after a start-up as a function of the digital feed-forward regulation value (Vout_req) and then correct the reference signal (Vref) as a function of the digital feed-back correction value.