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PMP7647 to power an arduino?

Lionel Favre
Prodigy 10 points
Other Parts Discussed in Thread: TIDA-00120

Hi,

I'm new there. I do a little project in my university and I must be able to power an Arduino with a AGM 12V battery and solar pannel.

I see that the PMP7647 board using the MSP430 could do that

But I don't know if it will work well? The arduino has 2 arducam and 2 led flash. It will consum less than 500mA (in 12V) and my solar pannel would be 5W 12V. I think the PMP7647 is overkill? Did you have other solution to my application?

Does the board interupt the charging wenn the battery voltage reach 14V? Does the board interrupt the load if the voltage is under 12V? It is possible to have a signal wenn the battery is 40% of charge (12.2V) to send a signal for changing the battery? 

Thanks for your answer and sorry for my bad english :S

  • 0
    TI__Mastermind 49692 points

    I couldn't find the TI Design page for the PMP7647 board. However, I did find the TIDA-00120 Solar MPPT Charge Controller product page. This design is capable of around twice the output current of the PMP7647 board, but you can download all the related collateral, including the BOM, schematic/design files, and the software from the product page. Please keep in mind that EVMs for TI Designs are not available for purchase.

    For your power requirements, I'd make sure your solar panel can output enough power to the system, although if the system is off for extended periods of time, the battery should be able to power the system when active and then get charged back up from the solar panel. You'll have to calculate the input power and output power based on the different voltage levels (and currents at those voltages; remember power conservation principles) and conversion efficiency between these levels. For the TIDA-00120, the expected efficiency is greater than 95%.

    After reading through the Description section in the Test Results document, this design has built-in battery charge profiles for LEAD ACID batteries, not AGM.

    Looking at the Block Diagram on page 3 in the Test Results document, the MSP430 should be able to cut-off the load based on the battery voltage. For signalling, there are several status and alarm indicators that are programmable but were not configured in this design. I'd recommend looking through the provided software.

    Regards,

    James

    MSP Customer Applications

  • 0 in reply to James Evans
    TI__Intellectual 1185 points

    Hello,

    This particular design has two power stages, One for charging the lead acid battery (Buck stage)  and other for driving the LED (Boost stage). Intended application is the solar street light where we charge the battery during day time and use the stored energy during night time.

    Knowing this background, it is possible to tweak the design for any other such application (for those kind of power ranges) by tweaking the relevant hardware and software. For Adruino board, I think it is an overkill because the power stage designed here is for processing powers > 100W.

    PMP7505/TIDA-00120 is further higher power without LED Driving Boost stage but just the load control.

    Jasraj

     

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