System Analysis of CCM Dual-Loop Controlled Light-Emitting-Diode Boost Driver

This paper presents the system analysis of the discontinuous-conduction mode (DCM) dual-loop controlled light-emitting-diode (LED) boost driver. The equivalent circuit models of the LED boost drivers are constructed to derive the system transfer functions for predicting the system performance, including the loop gain, line regulation and load regulation. The corresponding Bode diagrams are plotted and compared with those of the SIMPLIS ® simulations and measured results to validate the derived transfer functions.