Search found 15 matches

by TilmanBaumann
19 Jul 2018, 08:54
Forum: Related Hardware
Topic: Battery overvoltage protection - dump load
Replies: 13
Views: 3066

Re: Battery overvoltage protection - dump load

yup, that is the point. On/Off Systems with hysteresis inevitably oscillate.
Proportional response systems can also oscillate, but right away less severe and less likely. If it does, and it matters, it could probably quite easily be dampened.
by TilmanBaumann
16 Jul 2018, 11:31
Forum: Related Hardware
Topic: Battery overvoltage protection - dump load
Replies: 13
Views: 3066

Re: Battery overvoltage protection - dump load

Oh yes pf26, I like that one. Simple and straightforward.
by TilmanBaumann
13 Jul 2018, 20:32
Forum: Related Hardware
Topic: Battery overvoltage protection - dump load
Replies: 13
Views: 3066

Re: Battery overvoltage protection - dumb load

I'm no expert. But I would say the idea is to burn exactly as much energy on the FET, respectively the load, as it takes to pull the voltage below limit.
It's not just on/off. Effectively a constant current load proportional to the voltage error.
by TilmanBaumann
12 Jul 2018, 18:19
Forum: Related Hardware
Topic: Battery overvoltage protection - dump load
Replies: 13
Views: 3066

Re: Battery overvoltage protection - dumb load

I guess it could work, Though I suspect it could be quite susceptible to oscillations. As long as the load cuts in progressively and let's go when the voltage is below acceptable again, I think it should work in practice. I wonder, does it need to have a 'load'? Why not drive the current straight in...
by TilmanBaumann
26 Jun 2018, 07:33
Forum: Custom Applications
Topic: Simple high/low signal from VESC to operate a solid state relay
Replies: 5
Views: 784

Re: Simple high/low signal from VESC to operate a solid state relay

On a side note, I would eat my hat if that wasn't a LED headlight. It might be designed to run on a constant voltage (with a protection resistor) but it's also quite likely that is expecting a constant current. (I'm assuming this because of the very odd voltage of 4V) Consider using a constant curre...
by TilmanBaumann
03 Apr 2018, 14:45
Forum: General
Topic: OFF switch options
Replies: 3
Views: 701

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: 701

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: 1082

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: 7406

Re: Energy dump / overvoltage protection

Sorry that 68v was a typo.
The max pack voltage is 58V, which what I meant to type.

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