Photovoltaic LED Warning-light Driver Circuit with Partial Power Regulation

• Main Authors: Wan-Jung Chen, 陳婉榕
• Other Authors: Chin-Sien Moo
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/azmb4f

碩士 === 國立中山大學 === 電機工程學系研究所 === 107 === A light-emitting diode (LED) driver circuit of warning lighting with a photovoltaic (PV) panel is presented in the thesis. To efficiently utilize PV power, the LED driver employs a partial power regulator (PPR) for tracking the maximum power point (MPP) and simultaneously matching the dimming feature at the sunny daytime. An auxiliary power source with a bidirectional buck/boost power converter is required for storing the excessive power or compensating the insufficient power generated from the PV panel. A capacitor is interposed between two power converters as an intermediate energy buffer for regulating the LED current. A laboratory LED driver with a 54-W PV panel is designed for a 40-W warning-light formed by 36 LEDs. Experimental results have demonstrated that the LED driver can perform the dimming control of the warning-light and at the same time accomplish the MPP tracking of the PV panel in a wide operation region. A high efficiency can be achieved by processing a small part of the generated PV power with partial power regulation. A highest power conversion efficiency of 97.3 % happens when the requested LED power is totally provided by the PV panel. The worst efficiency is 84.6 % when the PV panel is not able to produce any power.