Autonomous DC Power Supply for Low-Power Consumers

A complete schematic diagram and results of an experimental study of an autonomous DC power supply for low-power consumers are presented. The main elements for its implementation are a photovoltaic panel, charge controller with Maximum Power Point Tracking, an ultracapacitor and a charge pump. A characteristic feature is a minimum amount of elements using to convert solar energy to DC voltage for the consumer, providing flexibility in choosing its value depending on the consumer's needs. Oscillograms from the experimental studies and results for the available stored energy and charging times at two values of the ultracapacitor - 10F and 100F - are shown.