CMOS Design for Indoor Photovoltaic Harvesting

• Autor(a) principal: Ana Luísa Cardoso Macedo
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/10216/137342
• topic: Engenharia electrotécnica, electrónica e informática; Electrical engineering, Electronic engineering, Information engineering

"The present work aims to study a photovoltaic (PV) energy conversion system for indoor applications. This system consists of a PV cell, a DC-DC switched capacitor (SC) and an energy storage element. It is common to PV harvesting systems to use maximum power point tracking (MPPT) methods in order to extract the maximum power from the PV cell. However, these methods do not guarantee the maximum power is delivered to the load, being lost in the DC-DC SC. It is important to also guarantee the maximum power point is transferred. Thus this system aims to guarantee the maximum power is being harvested but also the maximum power is being storage to the storage element. The power conditioning stage consist of cross coupled voltage doubler charge pump and a star up circuit between the PV cell and the switched capacitor. This stage guarantees the charge pump only operates when the energy available is sufficient for its correct operation. The output connects to a supercapactior where the energy is stored. Several simulations were made to analyse the performance of the system."