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  1. oldswamm

    An economical Hi Amp DIY BLDC controller

    Hi Alan, First time I've looked at this thread in a year or so. I've basically abandoned this design in favor of my own version of Lebowski's design. https://endless-sphere.com/forums/viewtopic.php?f=30&t=72728 Simpler, cheaper, and, I'm quite sure, a far better motor controller program than I...
  2. oldswamm

    A Lebowski controller in a 9 FET 'Infineon' case

    Hi Futterama, I wasn't aware he was offering a smt part when I started the project, although it was almost inevitable. Actually I specified this project (the whole bike electronics project, not the subject of this post), before I updated it with Lebowski's controller, and I decided at the...
  3. oldswamm

    E-bike control system w/BMS, lights, controllers, chgr, etc.

    Sorry to have taken so long to post an update, and reply to speaker guy. Speaker guy, this goes WAY beyond a fuel gauge or even the CA, which I still recommend heartily. :D Actually one of my very first posts on ES suggested the idea of using the copper wires to measure the current, but it's...
  4. oldswamm

    A Lebowski controller in a 9 FET 'Infineon' case

    Sorry to have taken so long to post an update. I have all the parts to build 3 controllers, one with IRFB4115s, one with FDH055N15As, and the third will depend on the tests with the aforementioned FETs. But, I decided the project needed a 3d printer to complete like I want to (as well numerous...
  5. oldswamm

    E-bike control system w/BMS, lights, controllers, chgr, etc.

    I pretty much abandoned that project when I broke my hip in the spring of 2012, and have hardly been on ES since. I was actually without a bike for a while (sold almost everything just to survive). It's hardly the same as the earlier effort, but still uses the same serial interface, and is an...
  6. oldswamm

    E-bike control system w/BMS, lights, controllers, chgr, etc.

    What I’ve been working on for the last 3 or 4 months is a whole bicycle control system. I’m concentrating on circuit/board design, as I intend to order boards out of China in mid Oct, so I’ll have time to get started on the programming while I wait on them (I think I have a pretty good idea for...
  7. oldswamm

    A Lebowski controller in a 9 FET 'Infineon' case

    I intended to order boards for this, as well as for the rest of my bike system, the first week of Oct, (but am not going to make it), and would appreciate any advice or criticism. Anybody have experience with dirtypcbs.com? I will put a variety of drawings, gerbers, renders, eventually...
  8. oldswamm

    Poor man's 15 Amp battery charger?

    I think a lot of the 'disagreement' is because we each have a chemistry were thinking about. When I think safety, I'm thinking primarily LiPo. Leslie, you wouldn't recommend this charger, under manual control, into LiPo, especially if we're shooting for 2C+, as a 'learning process' would you...
  9. oldswamm

    Poor man's 15 Amp battery charger?

    Any old timers want to weigh in as to what HVC stands for? I did a google search and the closest I found, out of over 50 definitions, was 'high voltage circuit' and 'high voltage capacitor'. I know some people use the M in BMS to mean monitor, so you have to ask what they mean by BMS (whether...
  10. oldswamm

    Poor man's 15 Amp battery charger?

    Is there a way to distinguish between the term for a high cell voltage monitor digital output, and the voltage across the entire battery. In this thread HVC seams to stand for the voltage across the entire battery, whereby I thought it stood for 'high voltage-cell'. Apparently this is another...
  11. oldswamm

    Poor man's 15 Amp battery charger?

    ga2500ev, you should check your PMs. I drew all this a couple days ago, then got busy (and also got sick), so I didn't post till now. And keep in mind that I'm trying to design for 'everyone', not just myself, so would like it to work with 12 to 150V. I know this is a long post, but I tried to...
  12. oldswamm

    Studded Tires?

    I said I would put up some pictures when I had a flat. That was yesterday. :) The tire has been slipping on the rim, allowing the screws to cut the liner, as is visible in the first pic. The second pic shows the wear on the studs. I have about 200 miles on this setup, but less than 5 on...
  13. oldswamm

    Poor man's 15 Amp battery charger?

    I already conceded! I have a full set of schematics drawn, but got busy. I'll try and post them tomorrow if I get time. Bob
  14. oldswamm

    Poor man's 15 Amp battery charger?

    ga2500ev, After I went to bed last night I got to thinking about it, and decided I owe you an apology for the last couple posts. I also decided I've PROVEN the point, the point that I'm a stubborn old man! :oops: :) Not admitting I'm wrong mind you. :wink: But i will concede that you have an...
  15. oldswamm

    Poor man's 15 Amp battery charger?

    That's not really an answer. The question was, 'WHY do we care if it's isolated'. To which you answer that it needs to be isolated because it's not. I could argue that the rectifier or the capacitors aren't isolated. They don't have to be isolated either. It's NOT dangerous to the operator...
  16. oldswamm

    Poor man's 15 Amp battery charger?

    You STILL haven't said WHY the processor board has to be isolated from the battery (and consequently the AC power). If you have the case open with power to it, the rectifier, the caps, the secondary processor (if used), and the battery connections have dangerous voltage available any way, so...
  17. oldswamm

    Poor man's 15 Amp battery charger?

    ga2500ev, I'm setting here and can't figure out your last post. I can see where my use of the word ground, even in quotes could confuse. What I meant was Vss, calling it ground is an OLD habit. Both the processor and the op amp Vss would be at Batt-. The CASE would be at earth ground, NOT...
  18. oldswamm

    Poor man's 15 Amp battery charger?

    I'm confused. What are you going to do with the pic on the mains side? Are you going to measure something there? The solid state relays are already isolated, and that's all I figured on having on the mains side. My board would be at Batt-, and there's no practical way to isolate it that I...
  19. oldswamm

    Poor man's 15 Amp battery charger?

    Thanks, I'm good at missing the obvious. <edit> Obvious where the inefficiency is, not it's % value.<endedit> I've been saying for almost 40 years that computers would be a lot easier if we didn't have to deal with this darn analog world. So what is our efficiency? Our power factor approaches...
  20. oldswamm

    Poor man's 15 Amp battery charger?

    HVC triggers if ANY one cell goes over a set voltage (4.28 in methods setup). Used so you won't dangerously overcharge a cell if there's a balance problem. What you're talking about could be used to trigger the crowbar using 102v or so (the charger should shut down before it gets there). The...
  21. oldswamm

    Poor man's 15 Amp battery charger?

    Ga2500ev, A crowbar puts a direct short across the output, blowing the output fuse from the charger and also the one to the battery. Absolute last resort, but DEFINITELY stops the current no matter WHAT the problem. Skippic, I'm tempted to "just say no", remember, Nancy's answer to the...
  22. oldswamm

    Poor man's 15 Amp battery charger?

    Skippic, after rereading your last post I see you are separating BMS and HVC. As far as I can see, the only part the charger needs to concern itself with is HVC, unless we want to tell it to go to trickle for balancing. ga2500ev, my board would be isolated from the mains with a transformer...
  23. oldswamm

    Poor man's 15 Amp battery charger?

    What I get for sleeping. :D (Lots of post to respond to.) Let me reiterate, I'm NOT trying to push more sophistication on you than you want. I'm trying to design a circuit with enough options that it will work for ANYONE. Just because an option is there, doesn't mean YOU have to use it! I'm...
  24. oldswamm

    Poor man's 15 Amp battery charger?

    Hi Filip, <edited for spelling,, sorry Filip> Trying to address your points in order. You can keep it as simple as possible, or anywhere in between. I'm trying to come up with a replacement for the switched supplies normally used for bulk charging, and providing for some optional 'bells and...
  25. oldswamm

    Poor man's 15 Amp battery charger?

    As to 'What the charger needs', that depends on what you want from a versatile battery charger. As to the latter, if you carefully read all my posts, and that's what you got, I've failed miserably in the communication department. My only reference to 'cell', was wanting the charger to know how...
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