Abstract
In this paper a HB- LED driver that can drive multi - color HB-LED strings using Single Inductor Multiple Current Output (SIMCO) buck converter topology is presented. Constant current sources are required to drive LED strings due to their non-linear I-V characteristics. In the proposed topology the average current in multi-color LED strings are controlled independently by using a combination of non-linear charge control and traditional Average Current Mode Control (ACMC) from a single DC voltage source. The SIMCO buck converter is operated in Continuous Conduction Mode (CCM) with ACMC to realize a constant source feeding multi-color LED strings. Simulation and experimental results of a high color rendering index (CRI) multi-color LED lighting system with 48V DC input and 500lm output are presented.
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