Solar Panel 9V battery iPhone charger

Discussion in 'The Projects Forum' started by Shrinee, Aug 16, 2014.

Thread Status:
Not open for further replies.
  1. Shrinee

    Thread Starter New Member

    Aug 16, 2014
    2
    0
    Hello, I am trying to make an iPhone charger. I have a 9v solar panel
    To charge a 9v rechargeable battery then to charge my phone but I can't seem to find the problem that I am making. I have diodes between the solar panel and battery and the battery and the 5v regulator on positive lead. Help me where I went wrong!
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,398
    497
    I don't see a problem.
    Did you find a problem?
     
  3. Shrinee

    Thread Starter New Member

    Aug 16, 2014
    2
    0
    Sorry should have mentioned this in first post. When I plug my iPhone cord in nothing happens.
     
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,398
    497
    Hm. There are some phones that require some additional pins to be activated in order for the phone to accept the charge. You might want to look into which pins of the plug that goes into the phone need to be used for the charging.
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    You could eliminate the second diode.

    iOS devices generally do require the data pins to see proper voltages. Also, inadequate current will prevent charging. A typical 9V battery cannot likely provide enough current.
     
  6. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,815
    834
    As WayneH pointed out, the data pins need to see some voltage to enable charging an iPhone. The circuit below illustrates using resistors in a voltage divider arrangement, to provide the proper voltages for an iPhone.

    [​IMG]
     
  7. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,398
    497
    Am I understanding correctly that USB end is the one that goes into the iPhone?
     
  8. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    A fundamental problem is that it takes a panel with an open circuit voltage > 15V to charge a 9V battery...
     
  9. IcedFruits

    Member

    Jan 15, 2014
    84
    2
    dont put voltage regulator there that way, if no battery is there. solar panels dont stick to a constant voltage when current is drawn. soon the panel voltage will reach a level below regulator minimum headroom, and it will shut down the regulator o/p i think ?

    and 9v panel - diode < 9v battery.
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    The output voltage of the regulator will sag if the source voltage sags, it doesn't really "shut down". But the regulator can be damaged if a voltage is applied to its output - by a battery or a capacitor - that exceeds its input voltage. Many schematics show a reverse biased diode across the regulator for this purpose - it routes the reverse current around the regulator instead of thru it.

    I don't believe an iPhone would put power on its USB power pins, so I don't think this is a problem for this application. Worth checking, I guess.
     
  11. Brian325

    New Member

    Oct 3, 2015
    9
    0
    hello guys im new to the forum i am working on a similar project to the one mentioned above. i have drawn up a very simple schematic i haven't wired anything yet. if someone could check it for me just to make sure i have no problems thanks Brian

    i am using
    a car charger usb with 34063ap1 chip.. so the voltage will be relegated correctly (i think)?

    9V 3W Mini Solar Panel
    led indicator
    2 1N914 Schottky Diode

    9V Volt 300mAh Ni-MH Rechargeable Recharge Battery
    2 switches
    voltage meter

    i will attach schematic below



     
  12. marcf

    Member

    Dec 29, 2014
    138
    20
    I do not think that there is such a thing as a 1N914 Schottky diode.
     
  13. Brian325

    New Member

    Oct 3, 2015
    9
    0
    i got my specs from a website that sells kits my design is just a little modified there is a 1N914 Schottky diode but not sure what the difference is from a Zener Diode or even if there is a difference

    here's a link to a Schottky diode

    http://www.ebay.ie/itm/121170158654?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT


    if you have any recommendations for my attempt at this project id be glad to hear them thanks

    kind regards Brian

     
  14. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    2$ for a schottky diode!!!!!!!It must be made of gold.....

    Draw a clearer schematic yous is hard to interpret.
     
  15. Brian325

    New Member

    Oct 3, 2015
    9
    0
    thanks for the advice i will draw up a new one and post it ASAP hopefully it will look better and easier to read

    im not really sure what is made of maybe gold as it is a good conductor of electricity thats what the kit said to use 1N914 Schottky diode im sticking to it as best i can to avoid unnecessary errors as i have no experience with electrical components this is my first time
     
  16. Brian325

    New Member

    Oct 3, 2015
    9
    0
    here is a look at the new schematic i left out the leds for convenience. Device Schematic new draft.png
     
  17. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    You have another thread running on this. You should keep your posts over there instead of bringing this old thread back to life.
     
  18. WBahn

    Moderator

    Mar 31, 2012
    17,788
    4,807
    So start your own thread instead of necrohijacking someone else's.

    Wayneh mentions that you already have another thread of your own. So use that. If there is something in this (or another) thread that is relevant, post a link in your thread.
     
Loading...
Thread Status:
Not open for further replies.