Search found 9 matches

by TilmanBaumann
03 Apr 2018, 14:45
Forum: General
Topic: OFF switch options
Replies: 3
Views: 189

Re: OFF switch options

Mini won't quite be beefy enough. (in fact I'm looking very eagerly at higher voltage options as they are developing) I think I found a very good solution. My BMS offers a 5V output. I can use that to keep auxilary stuff on-line. Also the BMS can switch the loads on and off. https://www.energusps.co...
by TilmanBaumann
28 Mar 2018, 14:13
Forum: General
Topic: OFF switch options
Replies: 3
Views: 189

OFF switch options

Dumb questions. How reasonble is it to keep the VESC connected to the battery at all time? What is the power consumption in standby? Anything I should be concerned about? My ebike will have a lock on the head unit. There will be a microprocessor with CAN that will be able to send VESC apropriate com...
by TilmanBaumann
28 Feb 2018, 09:37
Forum: Related Hardware
Topic: CAN enabled switches?
Replies: 2
Views: 503

Re: CAN enabled switches?

Ah, nice. That looks like a fun chip actiually.
by TilmanBaumann
17 Feb 2018, 17:22
Forum: Related Hardware
Topic: Energy dump / overvoltage protection
Replies: 24
Views: 4445

Re: Energy dump / overvoltage protection

Sorry that 68v was a typo.
The max pack voltage is 58V, which what I meant to type.
by TilmanBaumann
16 Feb 2018, 11:43
Forum: General
Topic: VESC 6 voltage/design limits?
Replies: 9
Views: 2542

Re: VESC 6 voltage/design limits?

Hey lizardmech, you mention modifications to allow higher voltage ceiling. Can you share some details? I'm not afraid to mod my controller. :D If you got a working solution... I have heard about that possibility a few times now. But I could never find anything concrete. Is what you are doing to just...
by TilmanBaumann
15 Feb 2018, 23:31
Forum: Related Hardware
Topic: Energy dump / overvoltage protection
Replies: 24
Views: 4445

Re: Energy dump / overvoltage protection

I have looked a little deeper into the subject. Generic crowbar circuits should catch transients just as well as as larger current dumps. The main difference would be not to dump the load into resistors but burn it ruthlessly into silicon chopping off anything going over voltage. Still not convinced...
by TilmanBaumann
15 Feb 2018, 17:13
Forum: Related Hardware
Topic: Energy dump / overvoltage protection
Replies: 24
Views: 4445

Re: Energy dump / overvoltage protection

Fantastic. I was very much concerned about going into an over-voltage regime. Mostly of the controller, but quite frankly also of the battery. We should really not be dumping any brake current into a battery that is already fully charged. When I first realised the issue I thought surely a 60V zehner...
by TilmanBaumann
15 Feb 2018, 17:03
Forum: Related Hardware
Topic: Functionality in the ideal BMS?
Replies: 5
Views: 918

Re: Functionality in the ideal BMS?

Ah, I see the issue has been addressed in this topic too. viewtopic.php?f=15&t=586

Perhaps not a bad idea actually. Just dump any over-voltge into a resistor. Easy low tech. Leaves us only with a thermal management issue.
by TilmanBaumann
15 Feb 2018, 16:57
Forum: Related Hardware
Topic: Functionality in the ideal BMS?
Replies: 5
Views: 918

Re: Functionality in the ideal BMS?

While recently reading through the code I also noticed that VESC doesn't seem to have battery protection in mind when it comes to regen braking. Ideally, it would interact with the BMS for such matters. But since it has voltage sensing for battery voltage, I would say a max cutoff voltage over which...

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