CPC G06F 1/3212 (2013.01) [A47B 96/02 (2013.01); A47F 5/0018 (2013.01); A47F 5/0043 (2013.01); A47F 10/02 (2013.01); A47F 2010/025 (2013.01); G06F 1/28 (2013.01); H01L 31/042 (2013.01); H02S 20/20 (2014.12)] | 10 Claims |
1. A system comprising:
a plurality of shelves each having a front edge;
a solar cell circuit disposed at the front edge of each of the plurality of shelves; and
a controller operatively coupled to the solar cell circuits, the controller adapted to monitor a frequency of a saw-tooth waveform at which a power transfer of each solar cell circuit occurs, and adapted to signal a device in response to a change in the frequency of the saw-tooth waveform at which the power transfer occurs.
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