Search found 26 matches

by bradleyk
Jun 27 2019 11:53pm
Forum: Battery Technology
Topic: LTC6811 Implementation Thread
Replies: 134
Views: 18230

Re: LTC6811 Implementation Thread

I've got this to the stage where it can now balance cells over multiple iso bus slaves. logging voltage every minute, accessable via a web interface. not yet talking over can. I'll be doing a pcb revision soon to clean up the layout to make assembly easier. https://gitlab.com/bradleyking4/esp32-ltc6...
by bradleyk
Jun 11 2019 5:13pm
Forum: Battery Technology
Topic: LTC6811 Implementation Thread
Replies: 134
Views: 18230

Re: LTC6811 Implementation Thread

Anyone managed to get anywhere with this? I've just finished designing a low parts carrier for this. So far I can measure cell voltage and do 50mA per cell and 200mA per pack about to start testing isobus chaining then looking at writing a standalone balance firmware for the esp32 master. https://gi...
by bradleyk
Dec 01 2017 5:00am
Forum: Motor Technology
Topic: Another lebowski Controller
Replies: 3
Views: 988

Re: Another lebowski Controller

Made a few changes to zombies layout with a new bus made out of 1.2mm copper sheet black is battery -ve and red is battery +ve.
Bus layout.PNG
Bus layout.PNG (185.1 KiB) Viewed 936 times
Modeled the controller in solidworks with a quick water cooling block.
Overview.PNG
Solidworks model
Overview.PNG (203.8 KiB) Viewed 565 times
by bradleyk
Nov 30 2017 2:15am
Forum: Motor Technology
Topic: Another lebowski Controller
Replies: 3
Views: 988

Re: Another lebowski Controller

Ahh yes, thank you.
I did have a look at the datasheet and all the examples had that pin disconnected but it has an internal pullup.
sweet thanks, solved that problem.
by bradleyk
Nov 29 2017 8:14pm
Forum: Motor Technology
Topic: Show off your lebowski controller
Replies: 38
Views: 6530

Re: Show off your lebowski controller

Let's see if we can't get this back on topic :D Just starting my development. Essentially 150v 20Kw motor driver I am not entirely sure what I am doing, But there is so much info on endless sphere. https://endless-sphere.com/forums/viewtopic.php?f=30&t=91723 just in the designing stage. WorkInProgre...
by bradleyk
Nov 29 2017 8:08pm
Forum: Motor Technology
Topic: Another lebowski Controller
Replies: 3
Views: 988

Another lebowski Controller

Hey Guys. Aiming to build a motor controller over the summer(Aus) for an electric car. Current battery is 24s2p, once everything is up and running I will be aiming for 30s(120v nominal) or so. Planning an 18 fet controller. 12-15Kw Continuous, 20-25Kw peak for starters I believe I should be able to ...
by bradleyk
Nov 21 2017 3:58am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1820
Views: 225028

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Woot, Just ordered two of these. Plan to put them in a smart car with zombies mosfet driver.

I have a question about the CAN bus. Can regen be controlled from the can bus? I couldn't see anything about it in the manual.
by bradleyk
Dec 04 2014 7:12pm
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 100v motor controller

OT the charger, here are the files i did them in eagle. the controller is still a work in progress, and will go above the fet's
by bradleyk
Dec 04 2014 3:22am
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 100v motor controller

it was a synchronous buck converter
by bradleyk
Dec 02 2014 6:37am
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 100v motor controller

i have now ordered a copy of zombies driver board to have a look at, will be ordering the BOM soonish
by bradleyk
Dec 01 2014 7:57pm
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 100v motor controller1

I thought everyone making car controllers used IGBTs instead of fets ? I'm surprised no-one has make a high power bike controller suing them tbh IGBTS require voltage > ~400 to be efficient. on a bike that is painful. Hopefully someone can advise about the performance of the AC-35 motor if that's w...
by bradleyk
Dec 01 2014 7:10pm
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 200v motor controller

yeah cool,
ok i thought the extended torque range might be worth the switching performance.
i'll rewire the pack for 24S
by bradleyk
Dec 01 2014 5:57pm
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 200v motor controller

yeah, does seem that way, makes a charger easier. hmm deffently some food for thought but this is what has me a bit concerned, have a look at the range of usable torque At 96v, torqure drops off at 3000rpm. http://hpevs.com/Site/power_graphs/imperial/peak/pdf/ac-35/96-volt/650-amp/AC-35%2096%20volt%...
by bradleyk
Dec 01 2014 4:38pm
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Re: Time to design a 3kw 200v motor controller

Driving 3kW with 200V is just retarded. Even driving 30kW with 200V is retarded. 3kw, yes it is. i was originally planning to go with ~150v volts, but i fount a 10kw nisson leaf module that fits where my petrol tank used to be. it's a 48s2p(180v nominal 200v max), i could make it a 90v nominal pack...
by bradleyk
Dec 01 2014 7:21am
Forum: Motor Technology
Topic: Time to design a 3kw 100v motor controller
Replies: 15
Views: 1908

Time to design a 3kw 100v motor controller

hey, i looking at designing a 3kw motor controller for a bit of practice before i try at a 15kw continuous for a car. from reading arlo's and zombies i will be using Lebowski's controller. i have a bunch of these ( ixth88n30p ) lying around, i know these aren't the best and should probably get some ...
by bradleyk
Sep 19 2014 1:08am
Forum: Battery Technology
Topic: Nissan Leaf 24cell bms connector?
Replies: 2
Views: 983

Re: Nissan Leaf 24cell bms connector?

thanks,i went at measured it today, i believe they are 2.28mm(0.09") pin spacing same as the mx7.
by bradleyk
Sep 16 2014 7:21am
Forum: Motor Technology
Topic: My new 18 FET TO-247 layout riding video page 10
Replies: 308
Views: 43351

Re: My new 18 FET TO-247 layout for Lebowski Controller

hey Zombiess,
ive been looking at designing my own but your look like a very nice and well layed out design.
i would love to use you design and modify it to work with 200v battery 100-200 amps.
cheers
by bradleyk
Sep 11 2014 5:44pm
Forum: Battery Technology
Topic: Nissan Leaf 24cell bms connector?
Replies: 2
Views: 983

Nissan Leaf 24cell bms connector?

does anyone know what these connectors are? https://lh5.googleusercontent.com/-t_rkRwyqvho/VBIaDy-G5nI/AAAAAAAAB-g/grax_sl0eTg/w736-h981-no/IMG_20140912_075137.jpg https://lh4.googleusercontent.com/-leoRt17C5_I/VBIaTE8ouyI/AAAAAAAAB-s/SVUTUx6JEgk/w736-h981-no/IMG_20140912_075142.jpg off the Nissan l...
by bradleyk
Jul 27 2014 11:37pm
Forum: Battery Technology
Topic: i2c BMS for hobbyking lipos
Replies: 31
Views: 3868

Re: i2c BMS for hobbyking lipos

you should be able to remove one of those opto couples, and maybe combine 2 of those dual opamp into one quad. you seem to be trading part count for price, you don't need a Darlington array to turn on the pnp's 6 2n2222's would cost 6c
by bradleyk
Jul 24 2014 5:36pm
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

Re: diy bms

The problem with those chips is the price. I will be monitoring 48s with this. 4 per board was a simple number that made life easy and cheap these boards cost under $4 in parts. Adding a $10 chip is a large change. It would be nice to have some of the features in hardware tho. Will see as time goes ...
by bradleyk
Jul 23 2014 10:06pm
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

Re: diy bms

yeah, i have updated the boards to reduce the current draw on the main cell when discharging other cells. the cells i am using these on are 60ah. so the 50uA doesn't matter. i would perfer to have one cell discharge then all 4 if i am using a linear reg. these ones do have a spot for the linear reg ...
by bradleyk
Jul 22 2014 8:13pm
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

Re: diy bms

yes i am using the internal reference, will be making a calibration program for each chip.
im not worried about the atmeg8's draw, it will be sleeping most of the time. but the resisters on the op amps are causing a difference draw, something like 150ua,200ua,200ua,150ua
by bradleyk
Jul 22 2014 1:17am
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

Re: diy bms

i have now assembled this on the bread board and i can't stop the uneven current draw, hmm.
good thing it can balance it
on the plus side a 10aH cell with the most discharge should take approx 40 000 hours to discharge. 4.5 years.
time to order the pcb's
by bradleyk
Jul 18 2014 5:44am
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

Re: diy bms

Well thought out layout. Looks like monitoring and balancing with no LV or HV cutoff? each board is only monitoring and balancing, the master could control a relay and have hv/lv cutoff How accurate are they? I am highly interested in something like this. If it would be available in (ready to plug)...
by bradleyk
Jul 17 2014 9:00pm
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 2219

diy bms

ive been designing a bms, was hoping for some feedback. should work from 0 - 4.5v cells using 1 atmega8 per 4 cells. with serial feedback, to a master http://endless-sphere.com/forums/download/file.php?mode=view&id=142289&sid=b0fb84f862f0a85760c1de770cd4f06f http://endless-sphere.com/forums/download...