A dual-input, single-inductor, dual-output (DISIDO) buck-boost converter for Internet of Things (IoT) wireless nodes, and a battery-assisted maximum power point tracking (MPPT) to pre-bias the inductor with an initial current is proposed, lowering the effective input resistance compared to that the conventional MPPT can match. An energy-flow-modulation (EFM) regulator maintains a regulated load voltage without adjusting the duty cycle. A hybrid MPPT operation principle switches between conventional and battery-assisted MPPT based on online source state. Experimental results based on a prototype show 11.16 mW input power gain under battery-assisted MPPT, compared to conventional MPPT, matching 7.69 Ω lower resistance with 2.4% lower duty cycle, and the effectiveness of EFM.
