Search found 169 matches

by oldswamm
Mar 02 2017 12:04pm
Forum: E-Bike Technical
Topic: An economical Hi Amp DIY BLDC controller
Replies: 65
Views: 7350

Re: 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 could...
by oldswamm
Dec 08 2015 3:33am
Forum: Motor Technology
Topic: A Lebowski controller in a 9 FET 'Infineon' case
Replies: 3
Views: 1370

Re: 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 start to u...
by oldswamm
Dec 05 2015 7:25am
Forum: E-Bike Technical
Topic: E-bike control system w/BMS, lights, controllers, chgr, etc.
Replies: 7
Views: 1254

Re: E-bike control system w/BMS, lights, controllers, chgr,

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 not a g...
by oldswamm
Dec 05 2015 6:59am
Forum: Motor Technology
Topic: A Lebowski controller in a 9 FET 'Infineon' case
Replies: 3
Views: 1370

Re: 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 other...
by oldswamm
Sep 28 2015 10:25am
Forum: E-Bike Technical
Topic: E-bike control system w/BMS, lights, controllers, chgr, etc.
Replies: 7
Views: 1254

Re: E-bike control system w/BMS, lights, controllers, chgr,

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 extens...
by oldswamm
Sep 27 2015 11:07pm
Forum: E-Bike Technical
Topic: E-bike control system w/BMS, lights, controllers, chgr, etc.
Replies: 7
Views: 1254

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 most...
by oldswamm
Sep 15 2015 1:48pm
Forum: Motor Technology
Topic: A Lebowski controller in a 9 FET 'Infineon' case
Replies: 3
Views: 1370

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 schematics, e...
by oldswamm
Apr 01 2012 12:57am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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? Most p...
by oldswamm
Mar 31 2012 11:46am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 it bal...
by oldswamm
Mar 30 2012 8:17pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 acrony...
by oldswamm
Mar 30 2012 1:23pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 be co...
by oldswamm
Mar 29 2012 2:55pm
Forum: E-Bike General Discussion
Topic: Studded Tires?
Replies: 113
Views: 27310

Re: 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. stud inside.jpg stud outside.jpg I have about 200 miles on this setup...
by oldswamm
Mar 28 2012 12:28am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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
by oldswamm
Mar 27 2012 8:30am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 argumen...
by oldswamm
Mar 26 2012 10:31pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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). Because it's not isolated from mains power. 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 ...
by oldswamm
Mar 26 2012 4:23pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 who car...
by oldswamm
Mar 25 2012 10:28pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 Batt-. Are...
by oldswamm
Mar 25 2012 8:03pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 can see. I...
by oldswamm
Mar 24 2012 4:50am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 1 into...
by oldswamm
Mar 23 2012 6:47pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 problem...
by oldswamm
Mar 23 2012 6:06pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 question "sho...
by oldswamm
Mar 23 2012 2:44pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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, but it's...
by oldswamm
Mar 23 2012 2:07pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 surprise...
by oldswamm
Mar 23 2012 6:48am
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 whistles...
by oldswamm
Mar 22 2012 3:52pm
Forum: Battery Technology
Topic: Poor man's 15 Amp battery charger?
Replies: 195
Views: 22893

Re: 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 many....