高效無線輸入功率控制器
可穿戴設(shè)備越來越傾向于使用無線電池充電，無需使用電纜或外露連接器，因此改善了用戶體驗(yàn)。LTC4126充電
器、DC-DC轉(zhuǎn)換器具有一個(gè)無線功率控制器，使其能夠從發(fā)射線圈產(chǎn)生的交流磁場(chǎng)無線接收功率（如LTC699 0解決方
案）。無線功率控制器將接收器端諧振電路的交流電壓整流成VCC引腳的直流電壓。此直流電壓饋入線性充電器，線
性充電器再調(diào)節(jié)對(duì)電池的充電。
LTC4126接收的能量超出所需能量，無線功率控制器通過將接收器諧振電路分流接地來調(diào)節(jié)線性充電器的輸入VC
C。這樣，線性充電器將高效運(yùn)行，因?yàn)槠漭斎胝帽３衷陔姵仉妷篤BAT之上。接合分流電路時(shí)，諧振電路也會(huì)接收
較少的功率，因?yàn)橹C振頻率與發(fā)射器頻率失調(diào)。
全功能線性電池充電器
LTC4126中的集成式恒流(CC)/恒壓(CV)線性鋰離子電池充電器可通過一組完整的保護(hù)功能確保充電周期正常運(yùn)行
,包括安全計(jì)時(shí)器的自動(dòng)充電和自動(dòng)終止、不良電池檢測(cè)和超出溫度范圍充電暫停功能。LTC4126包括可傳遞至系統(tǒng)微
控制器的充電器狀態(tài)和電池電壓電平信號(hào)。
無電感低噪聲DC-DC轉(zhuǎn)換器
LTC4126包括一個(gè)整體式無電感充電泵DC-DC轉(zhuǎn)換器，通過電池調(diào)節(jié)系統(tǒng)負(fù)載輸出。LTC4126的DC-DC轉(zhuǎn)換器可通過
其EN引腳開關(guān)，從而允許通過微處理器進(jìn)行控制。EN引腳也可與LTC4126的 PBEN引腳配合使用，以實(shí)現(xiàn)按鈕控制——無
需額外的去抖電路。
充電泵DC-DC轉(zhuǎn)換器具有三種操作模式，具體取決于電池電壓，以提高整體效率。
結(jié)論
LTC4126是受到良好保護(hù)、高度集成、極其緊湊的無線充電器接收器解決方案，是可穿戴設(shè)備的理想選擇。將LTC
4126（可穿戴設(shè)備端）與基于LTC6990（充電站端）的ZVS單晶體管發(fā)射器組合在一起，可輕松實(shí)現(xiàn)完整的無線充電解決
方案，基于這些設(shè)備的完整解決方案具有低功耗和低成本。
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