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    3. 產品應用
      首頁 > 產品應用>>>LCD電視機電源應用

      LCD電視機電源應用

      5.jpg

      PLC810PG集PFC及LLC離線式控制器與集成高電壓半橋驅動 器于一體。圖1所示為采用PLC810PG器件的電源結構簡圖, 其中LLC諧振電感集成在變壓器中。

      PLC810PG的PFC部分采 用無需正弦信號輸入參考的通用輸入連續電流模式(CCM)設 計,從而減少了系統成本和外部元件。

      DC-DC控制器驅動L LC諧振拓撲。這個變頻控制器可使 MOSFET在零電壓時進行開關操作,從而消除大部分的開關損 耗,提高效率。LLC控制器的核心是一個電流控制的振蕩器, 其頻率控制范圍支持電視機電源的傳統工作頻率。

      為了確保零電壓開關,PLC810PG中LLC開關的死區時間被嚴 格控制在容差范圍之內,并可通過一個外部電阻進行調節。高 低壓兩端的占空比緊密匹配,以提供平衡的輸出電流,從而降 低輸出二極管的成本。

      典型PLC810PG LLC設計的工作頻率為100 kHz(在額定工作條 件下)。視LLC電路的設計而定,開關頻率可以是額定工作頻率 的二分之一到三倍不等,這與輸入電壓和負載變化有關。

      PFC轉換器的頻率鎖定于LLC,以降低噪音和電磁干擾。在輕 載時提高PFC頻率與LLC同步可降低PFC升壓轉換器在轉換為非 連續模式時的電流,從而改善輕載工作狀況和降低電源線諧 波。

      該設計還提供PFC和LLC初級側故障管理功能。 可根據LLC相位對PFC PWM輸出相位進行動態調節,以便于開 關沿與PWM和LLC時序電路中的噪音敏感部分不相交。避免邊 緣沖突技術可簡化電源布板并提高性能。相位同步可降低 EMI頻譜成分和PFC電容的紋波電流。

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    4. 更新時間:2016-06-03
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