LED Driving Based on Digital Hysteresis Control
When power flows from battery to LED module, the circuit in Fig. 2 is actually a Zeta topology, with the schematic diagram re-drawn in Fig.5. The operating principle analysis of Zeta converter is similar to that of Sepic converter in Section III, with two operating modes in CCM and three modes in DCM. The definition of DCM and CCM in Zeta converter is whether the sum of inductor a current iLa and inductor current iLb has the possibility of being zero.