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Internet of the Backyard
Blog [iot_umbrella] #10 power supply – description
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  • Author Author: .lukasz.
  • Date Created: 30 Oct 2014 12:58 AM Date Created
  • Views 1858 views
  • Likes 3 likes
  • Comments 9 comments
  • iot_backyard
  • iot_umbrella
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[iot_umbrella] #10 power supply – description

.lukasz.
.lukasz.
30 Oct 2014

For umbrella project I build my own power supply system.

 

- solar panel (3V, 80mA)

- storage/battery element (LiPo rechargeable battery from Fuel Tank BoosterPack)

- my own universal solar charger device (based on TI bq255040 )

- TI TLV70433 LDO (3,3V, 150mA)

 

image

 

 

Designed by my universal solar charger is based on TI bq25504

 

 

image

image

image

 

image

 

Solar charger parameters are configured by resistors.

-          battery over voltage protection value (ROV1, ROV2)

-          battery under voltage protection value (RUV1, RUV2)

-          battery ok value and battery ok hysteresis value (ROK1, ROK2, ROK3)

Maximum power point tracking value is set on 80%.

Battery thermal shutdown protection value is set on 65”C.

 

In my solution I configured values:

-          over voltage: 4,2V (ROV1=4,5 M ROV2=5,5 M)

-          under voltate: 2,8V (RUV1=4,5 M, RUV2= 5,5 M)

-          battery ok.: 3,3 V battery ok hysteresis 3,7V (ROK1= 3,4 M, ROK2= 5,5 M, ROK3= 1,1 M)

  Bq25504 working like on shematic below:


image


During choosing rezistors paremeters very  helpfull is TI spreadsheet:  bq25504_Design_Help_V1_2.ods I used it in my work.


image


 

In attachment I share

Bq25504 datasheet, bq25504_Design_Help_V1_2.ods spreadsheet, and TLV ldo datasheet

 

Lukasz, Poland

Attachments:
imagebq25504.pdf
https://community.element14.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-01-12/bq25504_5F00_Design_5F00_Help_5F00_V1_5F00_2.ods
imagetlv70433.pdf
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Top Comments

  • shabaz
    shabaz over 10 years ago +3
    Hi Lukasz, Very useful info! I've been reading up on this device and the bq25505 recently. The information above will be extremely useful for the 'In The Air' challenge too, so I think lots of people will…
  • .lukasz.
    .lukasz. over 10 years ago in reply to ipv1 +1
    at the begin I was thinking about using trimpots too, but finally I resigned from this idea,,, why ? few reasons 1. trimpots are expensive 2. it is hard to buy trimpost with resistance 10M / 5M 3. trimpots…
  • .lukasz.
    .lukasz. over 10 years ago

    I connected cc3200 to power supply

    during connection to AP cc3200 was restarted

    so on the power supply output I added two capacitors 470uF 6.3V each

    problem was solved !

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  • .lukasz.
    .lukasz. over 10 years ago in reply to mcb1

    good idea

    I will add place for "right resistors"

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  • mcb1
    mcb1 over 10 years ago in reply to .lukasz.

    Lukasz

    Good points about the trimpots.

    If you redesigned the board would you include room for extra resistors to allow the right setting ?

    It seems there is space for them.

     

    Mark

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  • .lukasz.
    .lukasz. over 10 years ago

    thanks a lot for comments

     

    P.S.

    on pcb is little mistake I will fix it soon

    ROC1 resistor have value 15.62 M (MPPT value 80% configuration)

    in real world I had problem with buy,,, so I mounted two resistors 10M + 5.62M ( mounted in series both in 805 package )

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  • .lukasz.
    .lukasz. over 10 years ago in reply to ipv1

    at the begin I was thinking about using trimpots too, but finally I resigned from this idea,,,  why ?

    few reasons

     

    1. trimpots are expensive

    2. it is hard to buy trimpost with resistance 10M  /  5M

    3. trimpots with resistance 5/10M have  resistance tolerance like 5M (+/-)10% 10M (+/-)30% or greater

     

    In my solar charger I used ark2 for mounting resistors, so solar charger is universal,

    in final product ark2 should be replaced for resistors mounted on pcb board 

     

    P.S.

    for example

    5.5M value I create with connecting together 3 rezistors  (5M + 200k + 200k)

    4.5M value with connecting together two rezistors (4.3M + 200k)

    it  is easy in use,,, and universal

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