Electronics > Projects, Designs, and Technical Stuff
Terrible Idea Boost Converter To Be Tested On Gocart
Siwastaja:
--- Quote from: MagicSmoker on January 02, 2020, 11:14:03 am ---
--- Quote from: mzzj on January 02, 2020, 10:04:39 am ---Not problem really if you use 180v threadmill motor and 12v battery.
Go-kart would probably barely if at all move with 12v.
--- End quote ---
So letting the motor sit there stalled while the 12V battery continues to dump current into it through the boost diode isn't a problem?
--- End quote ---
With a large mechanical switch or contactor, which likely needs to be there for safety shutdown anyway, maybe it's acceptable behavior if the builder is the only user? Off-state current and torque would be low. It sucks, though.
i_am_fubar:
I did try a basic relay switch. 4x (rather cr4p condition) batteries gave an ok speed. 1 off would be a slow, but not insignificant providing the conductor losses aren't too low.
amyk:
For a relatively cheap and quick solution I would suggest getting an inverter (one with 120VAC output will be ~170VDC) and either putting a rectifier on the output or tapping into its internal HVDC bus.
T3sl4co1l:
--- Quote from: i_am_fubar on January 02, 2020, 05:00:18 pm ---Ahhh, I've got a separate 100A hall sensor on another PCB that also generates the PWM. It's shared across phases but should be able to detect OC and failures to force shutdown.
Ditto a 12A floating shunt on the output, shared across.
--- End quote ---
You need a per-channel sense. Think about current sharing, let alone compensation.
Tim
i_am_fubar:
Assuming ultimate accuracy and voltage stabilty isn't my priority. I figured that hitting each channel with the same PWM duty for a few cycles before readjusting based on average current /voltage would be sufficient to keep the system in it's safe operating perimeters.
Or do you think that the channel characteristics will vary that much?
Re. Inverter. Considered it, but the goal is to get some experience designing high power switching systems. So not really applicable :(
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