Abstract
Since the economic activities are going globalization, the developments of the personal electronic products are gradually toward portable, lightweight and powerful. However, all kinds of energy resources from the Earth are limited. Because the economic activities increased rapidly, the global warming and environmental pollution have been getting more serious. For this reason, people start promoting the Green-Energy consciousness in which the renewable energy source is a very important topic. An important character of the renewable energy source, either solar panels or portable generators, is that the generated power is small, unstable and inconvenient for direct use. Therefore, to solve the problem, a DC-DC boost converter for adapting the energy output from a solar panel has been designed in this thesis. This thesis will explain the DC-DC boost circuit theory and discuss different structures for feedback circuits, then introducing the choice of this design. The simulation results of this design: The input voltage range is from 1.35V to 2V. The linearity range of the detecting inductor current could reach 1 Amp. The output voltage is up to 4.2V. The range of the load current is between 10mA to 100 mA. And the conversion efficiency is up to 85% or above. The output voltage can be applied for Li-ion battery charger and the power MOS has been combined in one single chip. It is hopeful to integrate this chip into a portable charger system. The chip area is in TSMC 0.35um 2P4M CMOS standard process.