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.
|Number of pages||5|
|Journal||IEEE Transactions on Circuits and Systems II: Express Briefs|
|Publication status||Published - 2011 Dec|
Bibliographical noteFunding Information:
Manuscript received August 11, 2011; revised October 11, 2011; accepted October 21, 2011. Date of publication November 16, 2011; date of current version December 14, 2011. This work was supported by the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology of the Government of Korea under Grant 2010-0018875. This paper was recommended by Associate Editor G. A. Rincon-Mora.
- 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)
ASJC Scopus subject areas
- Electrical and Electronic Engineering