Abstract
Photovoltaic (PV) power is a viable power source for many emerging wearable and energy harvesting applications, however, they face the challenge of nonuniform light intensities over multiple PV cells. The key to enabling PV power for these applications is to re-investigate the PV panel and power converter configurations. A parallel connection, rather than a series connection, along with the concept of differential power processing (DPP) is explored to optimize PV power utilization under nonuniform lighting conditions. A single-ended primary-inductor converter (SEPIC) is designed and implemented as the parallel DPP converter used in a PV wearable system. Experimental results indicate that system efficiency of the parallel DPP architecture increases up to 14.9% compared to the SEPIC efficiency and effectively controls each PV at its maximum power point.
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