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Hot!Question about simulated battery load

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CJ_Chip
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2020/09/28 20:02:53 (permalink)
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Question about simulated battery load

I have the MCP73X23ev_lcp charger board and would like to make the simulated battery load included in the datasheet to explore the charger circuit.  I understand most of the circuit except for the DC power source on the left side.  There are no specs on what the value of the DC power source is.  Also I would like to know what the power source is used for.  Does anyone know what the power source is and why it's there?  Thanks
 

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    davea
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    Re: Question about simulated battery load 2020/09/28 20:55:03 (permalink)
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    Does anyone know what the power source is and why it's there?

    look at the charging data, graph
    and you will understand
    simple
    as the batt is charging the voltage go's up
    thats how you test it
    #2
    PStechPaul
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    Re: Question about simulated battery load 2020/09/28 21:55:24 (permalink)
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    I'm not familiar with the MCP73X23ev_lcp but here is a link to info on what appears to be a similar part:
    https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/MCP73X23EV-LFP
     
    At one time in a galaxy long ago and far away I was working on a design to simulate a NiCad or NiMH battery to test a Black & Decker charger, and it was going to be essentially a programmable power supply that would change its voltage in response to an applied charging current or a load, so it would also be able to provide a bidirectional programmable resistance, to simulate the response of a battery. So a PIC would monitor the applied current and load, and remember the ampere-hours of charge or discharge according to the battery specs.

     
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    NKurzman
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    Re: Question about simulated battery load 2020/09/29 00:34:51 (permalink)
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    Name of what you need is a four quadrant power supply. One that can source and sink current.
    #4
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