Micro-scale inductorless maximum power point tracking DC-DC converter

In this study, the authors propose a simple maximum power point tracking (MPPT) DC-DC converter amenable for micro-scale photovoltaic applications. The solution avoids the use of inductors and exploits a charge pump as a voltage boost element. To take into account the temperature dependence of the MPP voltage, a passive temperature compensation circuit is also included. To validate the idea a prototype was realised with commercial off-the-shelf components. A system efficiency better than 83% for output power above 90 mW is obtained. The results show the viability of the proposed approach which could be further improved through a full custom integrated-circuit design.