Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 58, Issue 12, Pages 802-806Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2011.2173971
Keywords
Battery charger; charge pump (CP); maximum power point tracking (MPPT); optimum power point tracking (OPPT); photovoltaic (PV) systems; solar energy harvesting; wireless sensor networks (WSNs)
Categories
Funding
- National Research Foundation of Korea
- Ministry of Education, Science and Technology of the Government of Korea [2010-0018875]
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This brief presents a regulated charge pump (CP) with an integrated optimum power point tracking (OPPT) algorithm designed for indoor solar energy harvesting. The proposed OPPT circuit does not require a current sensor that consumes power proportionally to the load. The solar cell voltage is regulated at the optimum power point; the CP output is regulated according to the target voltage. The controller of the OPPT circuit and CP dissipates only 450 nW; thus, the proposed technique is appropriate for indoor solar energy harvesting applications under dim lighting conditions.
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