Search found 170 matches

by 2moto
May 16 2014 3:17am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

It can be tricky soldering in between cells like this but after that I would really hate to replace some dude cell in the middle. Overall idea is nice BTW. :) Yes, pack surgery is tricky at the best of times. I always cycle test the individual cells a few times and measure the internal resistance t...
by 2moto
May 15 2014 11:57am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

Can you describe the extruded case your system fits? It sounds similar to what is used to house controllers.... Nothing fancy. As long as it has minimum internal dimensions of 50 mm high (or 2") and 44 mm width (or 1 3/4") it will work. You could probably even use plastic rectangular gutter down pi...
by 2moto
May 15 2014 9:50am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

Well, it's been quite some time but I've picked up this project again a few weeks ago. As I was the one originally bringing up the Intersil chip, I thought I'd at least report my progress. I've just ordered the revision 2 boards from OSH Park. 3 boards for US$20 shipped free world-wide is a bargain!...
by 2moto
Jan 02 2014 4:09pm
Forum: Battery Technology
Topic: eBike Master Switch Design
Replies: 331
Views: 34663

Re: eBike Master Switch Design

I buy most of my stuff from Farnell's (UK) and shipping is very reasonable. I'd be very surprised if they didn't have an equivalent type of P-FET. Have you tried searching their website by parameter as needed?
by 2moto
Jan 02 2014 1:12pm
Forum: Battery Technology
Topic: eBike Master Switch Design
Replies: 331
Views: 34663

Re: eBike Master Switch Design

You might want to try Farnell. They have distribution in Austria. Also, Ebay is worth a try.
by 2moto
Dec 13 2013 1:35pm
Forum: Battery Technology
Topic: eBike Master Switch Design
Replies: 331
Views: 34663

Re: eBike Master Switch Design

Can you use the renderings for further work? For example importing it into SolidWorks? Can you render it with components?
by 2moto
Nov 21 2013 8:52am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

Alan, any updates on this project. I am curious if you had a chance to power-up the board yet, or any other progress you've made.
by 2moto
Nov 20 2013 4:06pm
Forum: E-Bike Non-hub Motor Drives
Topic: New freeride project - LMX P1
Replies: 278
Views: 74205

Re: New freeride project - LMX P1

You can also get them in 26" trials size.
by 2moto
Nov 20 2013 1:35pm
Forum: E-Bike Non-hub Motor Drives
Topic: New freeride project - LMX P1
Replies: 278
Views: 74205

Re: New freeride project - LMX P1

Have you looked at BMX trials wheels? They are 19", even though they are called 20", and allow you to fit fat off-road tyres, and the rims tend to be stronger than bicycle ones. Something like this: http://www.chainreactioncycles.com/maxxis-creepy-crawler-mod-trials-tyre/rp-prod7955?_$ja=tsid:46412|...
by 2moto
Nov 13 2013 12:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: New freeride project - LMX P1
Replies: 278
Views: 74205

Re: New freeride project - LMX P1

Is this you, bzhwindtalker?

http://youtu.be/REeeYtp-8qE
by 2moto
Oct 03 2013 1:45pm
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

I used one like this: Image

The front opening infrared toaster ovens are nearly impossible to get in the UK. I bought mine wholesale and it was cheap, about $30 in US dollars.
by 2moto
Oct 03 2013 1:03pm
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

Just built a reflow oven using one of these kits: http://youtu.be/fI2esJriqzg

He's a young kid whose developed it. It works well and was about $50. You just need to buy a cheap toaster oven. Makes SMD assembly MUCH easier! Recommended.
by 2moto
Oct 03 2013 4:42am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

I have it on pretty good authority that purple circuit boards don't work all that well! :lol:
by 2moto
Oct 02 2013 2:03am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Ebike Battery Monitoring and Control System

Looks great! What did you use to render it and what file format is the output?
by 2moto
Sep 27 2013 7:25am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge/Discharge Control Sy

That OSH Park supply sounds very good. I usually use a more local (to me) supplier which charges 55 Euros for about the same board space. I'll have to check if they do international shipping and whether that's still economical. At the cost of OSH Park, it not even worth bread boarding anymore.
by 2moto
Sep 23 2013 9:03am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

I just use a very low ground pin current voltage reg (< 4uA typ.) to keep the micro powered in sleep mode from which it wakes periodically. It then wakes the Intersil chip, measures the voltages, temp, etc., transmits results back to master and goes back to sleep. When charging, it's always awake. F...
by 2moto
Sep 23 2013 7:47am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

That's a pretty good list. While I've adapted the schematics and completed layout of my existing design to use this chip, I won't get much beyond that in the next 2-3 monts due to lack of time. That is, I won't actually build PCBs or rewrite the micro code. I *might* be able to sneak some time to do...
by 2moto
Sep 21 2013 3:04pm
Forum: Battery Technology
Topic: Looking for a power supply
Replies: 19
Views: 2144

Re: Looking for a power supply

I did think of putting them in series, but what happens if the constant current is unequal, even slightly? I want to have a means to set the current anywhere from 0.1 to 5A, sort of like dimming LEDs.
by 2moto
Sep 21 2013 1:25pm
Forum: Battery Technology
Topic: Looking for a power supply
Replies: 19
Views: 2144

Re: Looking for a power supply

Ideally, I'd like to have single box. I already have a setup like you're suggesting using a lab power supply and server supply combo. But, as I said, I'd rather a cleaner, single box setup. My BMS already does all the functions during the charging process. I just need an adjustable current source th...
by 2moto
Sep 21 2013 6:02am
Forum: Battery Technology
Topic: Looking for a power supply
Replies: 19
Views: 2144

Re: Looking for a power supply

Yes, I looked through the Meanwell range but couldn't find a suitable one.
by 2moto
Sep 21 2013 3:17am
Forum: Battery Technology
Topic: Looking for a power supply
Replies: 19
Views: 2144

Looking for a power supply

I am after some pointers in the right direction for a new power supply that I want to use in a new project. Main specs are: - runs off-line, ideally something like 85-265VAC, 50.60 Hz - constant current output which must be adjustable from 0-5A - maximum output voltage 60V or higher - high efficienc...
by 2moto
Sep 19 2013 3:21am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

Has anyone taken apart one of those Cell Log devices? They are cheap, fairly accurate and would seem to be a good analog front-end for a BMS. How do they solve the level shifting? As it has an LCD display it presumably uses a microcontroller, but what's in front of it? Anyone know?
by 2moto
Sep 18 2013 4:01pm
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

Surely, it should be pretty straightforward to communicate over the I2C interface, no? I know, I know, famous last words!
by 2moto
Sep 18 2013 3:21pm
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

Here is what I got from an apps engineer at Intersil in response to a few questions. Answer 1 is encouraging. 1. The ISL94208 was just released, so it should have at least 10 years product life. 2. The TEMP3V, CFET, and DFET pins can be left unconnected. ISREF, CSENSE, DSENSE, VMON, and TEMPI should...
by 2moto
Sep 18 2013 1:41am
Forum: Battery Technology
Topic: Ebike Battery Monitoring and Control System
Replies: 186
Views: 21953

Re: Battery Data Acquisition and Charge Control System

Alan, our designs seem to converge at an alarming rate! LOL. Planning on using as much balancing current as I can. Clearly some thermal management will be needed. The chip has a thermal pad, so hopefully that can be used to good effect. This is one of the things I want to test in an actual setup to ...