Smart Solar Energy Illumination System with a Novel Bi-directional DC / DC Converter Charge/Discharge Controller

• Main Authors: Ming-Xuan Li, 黎明軒
• Other Authors: Yu-En Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/43774933124918452384

碩士 === 國立高雄第一科技大學 === 電子工程研究所 === 102 === This thesis proposes a smart solar illumination system with novel bidirectional DC / DC charge/discharge controller. Its architecture consists of a bidirectional DC/DC converter and smart computer human-machine interface (HMI) wireless monitoring. The novel bidirectional DC/DC converter combines synchronous rectification Sepic converter and active clamp flyback converter; it not only effectively uses common components to improve the disadvantages of conventional illumination system which requires two stages, but also possesses soft-switching, simple structure and high efficiency. In the daytime, the lead-acid battery is charged by synchronous rectification Sepic converter which uses maximum power point tracking (MPPT) and three-stage charging. To achieve battery protection and effective utilization of solar power, a HMI is designed to monitor the solar power generation and the battery charging condition. The battery is discharged at night through the active clamp flyback converter which also used to drive high brightness LEDs. The computer HMI not only used to remote adjust the LED brightness by the time and reply the system faulty condition, but also can send the controlled commands and receive the system information by Zigbee wireless transmission to display system status for achieving the purposes of the smart control and remote monitoring. Finally, simulation and hardware implementation is used to verify the feasibility and practicality of the proposed system.