- 學位論文
基於電流振幅調變技術之雙向脈衝鋰離子電池充電器
Bi-directional pulse charger for li-ion battery based on the current amplitude modulation technique
摘要
本文提出一種應用於鋰離子電池之改良式ReflexTM充電器，其電路結構由兩級所組成，前級為一返馳式轉換器，主要是提供功率因數修正、電氣隔離及降壓的功能；後級則為一雙向電路所組成，負責提供正負脈衝充電的作用。其次，本文中所採用之充電策略是依據電池瞬間電量而採用電流振幅調變之脈衝充電技術，以確保電池不至於過充或充電不足。再者，電量偵測的部份結合起始電量偵測較為精準之開路電壓法，與適合長期監控電池電量之庫倫量測法來決定正脈衝充電電流振幅的大小，因此，所提出之改良式ReflexTM充電法可同時達到延長電池壽命與快速充電的目的。本文中根據各操作狀態推導完整之數學模式，電腦模擬與實驗結果相當一致以驗證所提理論之正確性
並列摘要
This thesis proposes a improved ReflexTM battery charger for lithium battery, consisting of two stages. The first stage, which is a flyback topology, mainly provides the power factor correction, electrical isolation and step-down conversion. The second stage is a bi-directional topology, supplying the positive and negative pulse charging. Next, in order to avoid overcharging or charge insufficiency, this thesis proposes a pulse charging strategy according to the instantaneous electrical capacity of the battery based on the current amplitude modulation technique. Furthermore, the electrical capacity detection is integrated by the open-circuit voltage method, which is more precise for initial capacity detection and the coulomb method, which is suitable for long term monitoring, to determine the charging pulse amplitude. Therefore, the proposed improved ReflexTM method may simultaneously prolong the battery life and achieve the rapid charging. Moreover, the mathematical models of each operation mode are also derived. All the experimental results agree with the computer simulations to verify the theoretical predictions.