Go Down

Topic: How to control very very really very high currents with arduino? (Read 2 times) previous topic - next topic

juanfsepulveda

Hello,

I'm working in a discharger of LiPo batteries that must discharge at rates of 100 amp, with batteries of 12 and 24 volt. I've seen some tutorials of "high power control with arduino" but the high power is only 5 or 10 A, and they recommend some FET and/or MOSFET for that currents. My question is: Is it possible to manage 100A currents with those diagrams? and what mosfet or transistor do you recommend for this job?

Thanks for your answers and sorry for mistakes in my english  :P

retrolefty

Depends on what you mean by 'manage'. If you just need to be able to measure the current I think there might be hall effect current sensors that can measure that range of currents and give you a simple DC measurement voltage proportional to the current flow. If you mean to turn on and off or regulate the actual current flow then that is another matter all together. One could use very high current rated relay contacts if just switching on or off that level of current, although the size of relay would probably be pretty massive. There are some IGBT high current transistors rated at that kind of current, and of course one could parallel several high current/power MOSFETS to get that kind of current control. Pretty demanding application, I would look around and see what other people and firms have used to perform that task first I think.

Lefty

majenko

MOSFETs with many hundreds of amps constant drain current are pretty common.

A quick search on Farnell turned up loads with currents up to about 480 amps.

How about the IRLB3813PBF ?
Quote

MOSFET, N CH, 30V, 190A, TO220
Transistor Polarity: N Channel
Continuous Drain Current Id: 260A
Drain Source Voltage Vds: 30V
On Resistance Rds(on): 1.6mohm
Rds(on) Test Voltage Vgs: 10V
Threshold Voltage Vgs Typ: 1.9V
Power Dissipation Pd: 230W
Operating Temperature Min: -55°C
Operating Temperature Max: 175°C
Transistor Case Style: TO-220AB
No. of Pins: 3
SVHC: No SVHC (19-Dec-2012)
Cont Current Id @ 100°C: 190A
Cont Current Id @ 25°C: 260A
Current Id Max: 260A
Operating Temperature Range: -55°C to +175°C
Package / Case: TO-220AB
Termination Type: Through Hole
Transistor Type: Power MOSFET
Voltage Vds Typ: 30V
Voltage Vgs Max: 1.9V
Voltage Vgs Rds on Measurement: 10V


Of course, you'll be wanting some very very fat PCB traces, and a rather large heatsink to dissipate the heat...  Maybe you could boil a kettle with it :)
Get 10% off all 4D Systems TFT screens this month: use discount code MAJENKO10

Grumpy_Mike

Quote
I'm working in a discharger of LiPo batteries that must discharge at rates of 100 amp

So is this an incendiary device then. What is to stop the battery bursting into flames?

majenko


Quote
I'm working in a discharger of LiPo batteries that must discharge at rates of 100 amp

So is this an incendiary device then. What is to stop the battery bursting into flames?

Maybe they're 100Ah batteries, and he wants to discharge them at 1C - A resistor the size of a small cow would do the job...
Get 10% off all 4D Systems TFT screens this month: use discount code MAJENKO10

Go Up