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Fuzzy logic-based solar charge controller for microbatteries
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DOI：10.1109/PVSC.2000.916237.png)
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Abstract
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A severe limitation on the functional capability of remote, autonomous microelectromechanical (MEMS)-based sensors is the lack of a suitable micropower supply to power these devices. Such sensors often have low power requirements that may be provided by the combination of an energy scavenger (e.g., a solar cell) and a rechargeable microbattery (mu battery) made using integrated circuit fabrication methods. While rechargeable mu batteries and solar cells have been previously demonstrated the development of a microcharge/discharge controller has not. In this paper we present a novel, fuzzy logic-based solar charge controller that allows control of the charge/discharge of mu batteries. A breadboard implementation of the controller and its integration with a solar cell and mu battery will be presented. The circuit topology of the mu battery controller is based on a buck converter design. During charging, the solar cell's operating point is adjusted by modulating the duty cycle of the buck converter's switching MOSFET using a fuzzy logic control algorithm to optimally charge the mu battery. Discharge data on the mu batteries and current-voltage characteristics of the solar cell will be presented and the fuzzy logic model development for the charge control will also be presented.
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