本研究旨在探討鋰電池自平衡以及喚醒技術,以提升獨立型太陽光發電系統的性能。 鋰電池主被動式平衡技術係利用一些元件,如電晶體(MOSFET)、電阻、電容及電感等來對鋰電芯作能量轉移,以達到平衡的功能,但是過程中會產生熱能造成能量損失,或因為設計複雜使得價格昂貴故障率高。 本研究的自平衡技術是利用切換控制,當鋰電芯有異常時,將鋰電芯從串聯轉為並聯,以進行自平衡,平衡過程中不會產生大量的熱能,而且電路設計簡單價格便宜。 對一些獨立型太陽光發電系統,當鋰電池開啟低電壓保護後,會造成斷電,使太陽能控制器失效。本研究開發一喚醒電路,當太陽出現時,可重新啟動鋰電池正常運作。
The main purpose of this thesis is to investigate the self-balancing battery management system and wake-up technology to improve the performance of stand-alone solar PV system. Both active and passive battery management system design will use some of the components such as transistors (MOSFET), resistors, capacitors and inductance to store the lithium energy and to transfer to the other in order to achieve battery balance, but the process will generate heat causing energy loss, or because the design complexity makes the circuit expensive. Self-balancing battery management system design is to use the simple components to reach the advantage of both active and passive battery management system-low cost and low energy loss. It can also reach the function of battery balance. For some solar PV system, when the lithium battery reach low-voltage protection will shut down the solar controller. This study design a wake-up circuit. When the sun appears, solar system can be restarted by the wake-up circuit.