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BQ24610: Cannot charge when the solar panel is used as input

William Zhang2
Intellectual 905 points
Part Number: BQ24610
Other Parts Discussed in Thread: BQ24650

Hi Expert,

Customer is using BQ24610 with power path function in 3s battery charging. The input source are a AC/DC adapter and a solar panel.

But they found there is some issue occurred when the solar panel is used as input.

It can be charged stably in the AC/DC adapter, but when switched to solar panel input, the charging current is very small, only about 50mA. And it should be due to the output voltage of the solar panel dropped below the battery voltage, and then the IC went into sleep mode (we saw that the MOS that controls the battery path has a gate drive signal) and did not charge normally. But we found that the output signal of STAT indicates that it is currently charging normally.

Above, we want to finally confirm whether this solution can be applied to the scenario where the input source is a solar panel?

As our initial requirements, we need a 2-cell lithium battery charging management solution that can support both solar panels and AC/DC adapter input. Is there an application solution that can meet our needs?

Thanks.

  • +1
    TI__Mastermind 40375 points

    Hello,

    Correct me if I am wrong, but the customer is experiencing the voltage collapse of the input to the converter which is also the output of the solar panel? This is completely expected. The charger will try to pull as much power as it can, and will collapse the solar panel if the charger draws more power than the solar panel can provide because there is no regulation on the input to stop it. You need an IC or circuit that will hold the output voltage of the solar panel without crashing it.

    The BQ24650 is from this family and has this feature. When the input voltage drops below the set point, the charge current is reduced to maintain the input voltage.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answers your question.