When I registered here, I set myself the goal to start my first conversion build in 2018.
And a couple of months ago I decided to go for it after I saw the first results of €1000 DC conversion here.
To do a build on a shoestring and in a short period of time, the electronics have to be simple (no uC) and inexpensive.
No build can do without a precharge circuit for the caps of the power stages. Motor controller in the first place.
So it's no surprise that I have seen quite a few posts with questions about precharging.
And it's the reason for starting a seperate thread on it.
Precharging hasn't been high on my list of priorities until now, because there's nothing exciting about slow charging of caps.
But actually, once I started to design a circuit, it turned out to be very pleasant experience.
With a strong 70s feel to it. Yeah, discretes! I love it. Paint it orange and purple.
So I ended up with 14 discrete components to get the caps charged and the main contactor switched on automatically once the charging is done.
Now we have to put it to the test.
Parts bill (retail): €10 incl. 1x1" PCB. Of course excl. case, connectors, cables, contactors.
- battery + from precharge contactor, min 40V, max 1000V.
- power stage caps -
- power stage caps +
- GND (12V system)
- MAIN CONTACTOR COIL -, other coil lead connected to +12V rail (12V system).
Or can I just copy a €10 circuit with the same functionality that has been posted here before?