National Chiao-Tung University

Department of Electronics Engineering & Institute of Electronics





High Efficiency Power Management System For Solar Energy Harvesting Applications






Student : Jung-Yi Wu

Advisor : Dr. Wei Hwang



Abstract

The goal of this research is to design and implement a high efficiency power management system for solar energy harvesting applications. This includes the design of voltage regulator and switched capacitor DC-DC converter, high charge pump and PV cell maximum power tracking control circuit. The major contributions of this thesis are list as follow:

  1. A high efficiency power management system for solar energy harvesting applications is proposed. The power management system receives power from photovoltaic (PV) cell and generate different voltage levels which are suitable for SoC integrated regulator applications (such as 1V~0.3V for analog circuitry and low power digital circuitry, -1.2V for memory circuitry, and 5V for I/O components).
  2. A novel connect scheme for improving power efficiency and loading capability of charge pump which generates ultra high voltage is proposed.
  3. A maximum power tracking circuit for controlling PV cell in maximum power region is proposed and integrated to the power management system for solar energy harvesting applications. The power management system works with a rechargeable battery and uses the energy of battery efficiently.