[neutrino]

Hello,

I have a problem of performing current sensing, as I'm not sure to what device should I use for it. The problem is that expected current rating should go up to 450A, but it is also expected to be much lower during cruising speeds. Should I go with some kind of IC, op-amps, current sense transformer, or even something else that I'm not aware of.
Any input is greatly appreciated as I'm trying to keep this thing fairly affordable.

Thanx!

[TheSGC]

Get a Hall Effect sensor. It's isolated and real simple to use and doesn't require and special components.

[JRP3]

I've been looking into a hall effect ammeter for around 600 amps but haven't found anything applicable. Any links?

[WSJ]

The BB Series Hall effect current sensors accurately measure
DC and AC currents and provide electrical isolation between
the output of the sensor and the current carrying conductor.
The response time can be improved with a faster op amp.

http://www.sypris.com/filemanager/library/BB150_300_600.pdf

[TheSGC]

Originally Posted by JRP3

I've been looking into a hall effect ammeter for around 600 amps but haven't found anything applicable. Any links?

Here is the one that is used on the PakTrakr: http://www.mouser.com/Search/Product...5fbG3zJD2zM%3d

I have two of these and working on putting them in my custom BMS I am working on.

[JRP3]

Originally Posted by TheSGC

Here is the one that is used on the PakTrakr: http://www.mouser.com/Search/Product...5fbG3zJD2zM%3d

I have two of these and working on putting them in my custom BMS I am working on.

I saw the PakTrakr unit but the opening looks too small for 2/0 cable, and though they show a copper bar that fits through it, one of the benefits of using a hall effect is you avoid the 2 extra connections of a shunt. I was also hoping for a complete package with sensor and gauge.
The Sypris unit looks large enough but I'd have to build a sealed mounting enclosure for it. Maybe there is no off the shelf item that will do what I want.

[Dennis]

Hello,

I have a problem of performing current sensing, as I'm not sure to what device should I use for it. The problem is that expected current rating should go up to 450A, but it is also expected to be much lower during cruising speeds. Should I go with some kind of IC, op-amps, current sense transformer, or even something else that I'm not aware of.
Any input is greatly appreciated as I'm trying to keep this thing fairly affordable.

Thanx!

I built a 50 AMP bike speed controller and I used 1/2 of a LM193 (other half is used for PWM) comparator that compares a very stable voltage of 50mV against what my current sense resistor shows on its Kelvin leads (the resistor has 4 terminals) when current flows through it. The downside of course is some power is lost as heat when using resistors as current sense elements.