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BQ769142: PROTECTIONS_RECOVERY_TIME 設定疑惑

jimmy shih
Prodigy 20 points
Part Number: BQ769142

你好，

想了解 RECOVERY_TIME 的用法，

目前Cell 電壓2.7V 觸發 Cell Undervoltage Protection(電壓:3V) 的保護，當Cell 電壓回復到 CUV_RECOVERY_HYSTERESIS(電壓:3.2V) 時，希望延遲3 second 後將保護解除，

在PROTECTIONS_RECOVERY_TIME 設定為3 second ，意思當達到CUV_RECOVERY_HYSTERESIS 時3 second 後會解除保護?

如果也要設定OCC_THRESHOLD 觸發後 30 second 將 Overcurrent in Charge Protection 的保護解除(不靠電流偵測解除，而是要透過時間來解除保護)

而PROTECTIONS_RECOVERY_TIME 在 Cell Undervoltage Protection已經設定為3 second，在Overcurrent in Charge Protection 的PROTECTIONS_RECOVERY_TIME 要如何設定呢?

  • +1
    TI__Guru*** 130456 points

    您好，CUV recover满足下面的条件才会recover：

    Safety Status A()[CUV] = 1 and Min cell voltage > Protections:CUV:Threshold + Protections:CUV:Recovery Hysteresis for Protections:Recovery:Time

    OCC保护恢复条件如下：

    The device will recover (if configured for autonomous recovery) when the voltage measured on the PACK pin falls at least Protections:OCC:PACK-TOS Delta below the voltage measured at the top-of-stack for a duration of Protections:Recovery:Time, or a current less than or equal to Protections:OCC:Recovery Threshold (that is, a discharge current) is present for a duration of Protections:Recovery:Time.

  • +1 回复 Star Xu
    Prodigy 20 points

    您好

    有看到先前有人的提問及回覆中，

    https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1000337/bq76952-protection-occ-recovery-threshold

    Matt Sunna 最後一個回覆有提及到將discharge current 設定為正值，就會藉由Recovery:Time 來進行恢復。

    CUV 跟 OCC 的恢復時間在文件資料裡都是寫Protections:Recovery:Time，而不像Overcurrent in Discharge，有專用 OCDL:Recovery Time 的設定，所以在Protections:Recovery:Time 設定為3s，那OCC recover 在Protections:Recovery:Time 想要設定為30 second，需要如何設定?

    再麻煩幫忙解答，感激不盡!!!