Results 1 to 17 of 17
  1. #1
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91

    DIY LIPO Charger

    5 Cell 2 AMP 20.8V

    Build :
    Based on the Linear LTC4012
    4Layer 2oz FR4
    PIC 18F14K22
    700 Lines on C Code.
    4D Systems OLED Display

    This was a lot of work. Now I wont be at the mercy of stock chargers...

    Dwight
    Attached Thumbnails Attached Thumbnails DIY LIPO Charger-lipo1.jpg  

    DIY LIPO Charger-lipo7.jpg  

    Last edited by Happy Rabbit; 01-29-2013 at 09:55 AM.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91
    PCB Layout
    Attached Thumbnails Attached Thumbnails DIY LIPO Charger-lipo6.jpg  


  3. #3
    mtbr member
    Reputation:
    Join Date
    Oct 2008
    Posts
    1,295
    That's impressive. Believe it to be a first over here on the forum.

    Nice work.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Feb 2006
    Posts
    1,269
    Wow. Lots of work, certainly above my intelligence grade.

  5. #5
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91
    back side view pcb
    Attached Thumbnails Attached Thumbnails DIY LIPO Charger-lipo10.jpg  

    Last edited by Happy Rabbit; 01-28-2013 at 08:14 PM.

  6. #6
    mtbr member
    Reputation:
    Join Date
    May 2005
    Posts
    2,275
    Wow! Awesome bit of work there. Does this have features beyond those offered in the RC lipo chargers? Are you producing this PCB for sale possibly?

  7. #7
    Rep Power Infinity +2
    Reputation: brad72's Avatar
    Join Date
    Jun 2009
    Posts
    1,567
    Nice charger. Who did you get to fabricate the pcb?

  8. #8
    mtbr member
    Reputation: piesoup's Avatar
    Join Date
    Feb 2009
    Posts
    448
    That certainly is impressive!
    Is is set to 5s batteries or will there be options / software changes available for smaller batteries?

    I like it as I use 5s batteries!

  9. #9
    mtbr member
    Reputation:
    Join Date
    Aug 2010
    Posts
    96
    Awesome work. Nothing beats being able to make your own boards and having something designed exactly to "your" needs/specifications

    Will

  10. #10
    mtbr member
    Reputation: mattthemuppet's Avatar
    Join Date
    Jul 2004
    Posts
    2,300
    Quote Originally Posted by bad andy View Post
    Wow. Lots of work, certainly above my intelligence grade.
    +1 on all counts

  11. #11
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91
    Formatted Screen.

    The design will support 3s,4s,5s packs with varying current from 0-4amps. 95% eff ->(Synchronous Buck). Minimal heating with all components under 40C @ Worst case (45watts). To be honest its surprisingly stable and well behaved. The LTC4012 does most of the heavy lifting and the PIC monitors time,temp, voltage and current. The PIC basically tracks the process, updating the OLED, and stops the process if the time gets to long, no current, over voltage, over temp, and termination 0.1C of charge. The OLED from 4D systems is really nice and dead simple to control with serial commands. OLED's look great.

    I was using an Digital RC Charger since cheapo 5S chargers are few and far between. Plus the RC chargers did not play nicely with the batteryspace PCB protection design. I had difficultly starting the charge process after the PCB disconnected the (+) due to low pack voltage. Also, Very Few of the digital RC chargers support unbalanced charging.

    One word of warning... The Microchip MPLABS IDE XC8 (aka Microchip C Compiler) is not for the weak of heart. It might be FREE but It will make you work for it.... And please avoid the sprinf()..it a hot mess. I have to admit it has a very nice debugger

    PCB Layout Software and Boards are from PCB Manufacturer in Aurora Colorado Manufacturing Annular Ring, Printed Circuit Board Fabrication, Printed Circuit Boards, PCB Prototype Circuit Board's Its FREE...Tinny Tiny learning curve but once past it , I have really enjoyed designing PCB.

    Dwight
    Attached Thumbnails Attached Thumbnails DIY LIPO Charger-lipo11.jpg  

    Last edited by Happy Rabbit; 01-29-2013 at 04:40 PM.

  12. #12
    mtbr member
    Reputation:
    Join Date
    Sep 2007
    Posts
    53
    Does it do balancing as well?

  13. #13
    mtbr member
    Reputation:
    Join Date
    Jan 2007
    Posts
    754
    Nice work. That's a new PCB fab house that I haven't heard of, will have to file that away for future reference. I've always used PCB Software | PCB Design Software | Sunstone PCB123 and don't really have any complaints, but I'll have to compare prices next time I do a board.

    Quote Originally Posted by Happy Rabbit View Post

    One word of warning... The Microchip MPLABS IDE XC8 (aka Microchip C Compiler) is not for the weak of heart. It might be FREE but It will make you work for it.... And please avoid the sprinf()..it a hot mess. I have to admit it has a very nice debugger
    That's good to know about the microchip free 'C' compiler. I've always used the CCS C compiler for PIC chips, and it's quite good, but it's not free. I had thought about switching to the Microchip compiler but think I'll stay put.

    I'm also using AVR processor more and more now. The free tools are good and there seems to be more freely available software libraries and other goodies available.

  14. #14
    mtbr member
    Reputation: phburns's Avatar
    Join Date
    Sep 2008
    Posts
    78
    Very nice work!

  15. #15
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91
    The housing 120mm x 70mm x 35mm

    DIY LIPO Charger-charger2.jpg

    DIY LIPO Charger-charger1.jpg

    DIY LIPO Charger-charger3.jpg

  16. #16
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    91
    Finally finished the charger. Works nice. the OLED screen was a train wreck. 4d Systems, The Manufacture, changed the firmware so I had to rewrite the software and the PCB. Using the enclosure as a heat sink turned out well...fan-less. Only took 10 months to complete.. Time to focus on the bike lite..

    Dwight

    DIY LIPO Charger-li-ion-charger-1.jpgDIY LIPO Charger-li-ion-charger-2.jpg
    DIY LIPO Charger-li-ion-charger-3.jpg
    Last edited by Happy Rabbit; 07-09-2013 at 12:35 PM.

  17. #17
    mtbr member
    Reputation: tigris99's Avatar
    Join Date
    Aug 2012
    Posts
    1,068

    Re: DIY LIPO Charger

    Very nice. Beyond my skill/patience lvl but luckily I kept my good charger from when i was big into rc.

    Sent from my HTC Sensation Z710e using Tapatalk 2
    Trek Marlin 29er

    Like It, Love It, Want Some More Of It!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •