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BQ25570: When using the BQ25570, will there be a situation where the chip charges the energy storage component again and the energy storage component also outputs electricity?

hairui zhao
Prodigy 65 points
Part Number: BQ25570

When using the BQ25570, will there be a situation where the chip charges the energy storage component again and the energy storage component also outputs electricity? If this happens, it might cause problems, right? How can we avoid this phenomenon? If the input energy is sufficient, will it directly supply power to the load?

  • 0
    TI__Mastermind 35185 points

    您好，

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

  • 0
    TI__Mastermind 31590 points

    Hello,

    As shown in Section 7.4.3, "The boost charger is disabled when the voltage on VSTOR reaches the user set VBAT_OV threshold to protect the battery connected at VBAT from overcharging. In order for the battery to charge to VBAT_OV, the input power must exceed the power needed for the load on VSTOR." Also, as shown in Section 7.3.3, "Once the voltage at the battery exceeds VBAT_OV threshold, the boost charger is disabled. The charger will start again once the battery voltage drops by VBAT_OV_HYST. When there is excessive input energy, the VBAT pin voltage will ripple between the VBAT_OV and the VBAT_OV_HYST levels."

    Please elaborate on your question.

  • 0 回复 Links
    Prodigy 65 points

    请问充电逻辑是这样

    1、太阳充足时     太阳能给负载供电，也在给电池充电吗？

    2、太阳能不足时（如阴天）  太阳能输入电流低  是给电池充电吗？然后电池同时输出给负载供电吗？还是太阳能输入+电池输出=负载功耗？

    3、无太阳      电池负载供电

    请问这个逻辑对吗

  • +1 回复 hairui zhao
    TI__Mastermind 31590 points

    Hello,

    1. It will do both as long as VBAT_OV has not been reached as shown by the previous sections.

    2. Yes, the lower the input power with a fixed load will charge the battery more slowly. Again, "In order for the battery to charge to VBAT_OV, the input power must exceed the power needed for the load on VSTOR." If the load power exceeds the input power, the battery voltage will drop. Yes, the battery will begin to discharge if the solar input is too low.

    3. I do not see a question here?

  • +1 回复 Links
    Prodigy 65 points

    谢谢  您的回答对我帮助很大