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'[EE] DC current sensing with hall effect sensor'
2006\10\18@124758 by Ariel Rocholl

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I need to measure, then A/D convert into something a PIC can use, DC
currents from 1A to 100A. I was told this should be feasible with hall
effect sensors, but the application notes I see in freescale and others are
apparently more orientated to detect movement of magnetic elements, for
instance to work as a tachometer.
Does anyone has experience using hall effect sensor for DC current measure?
Any application note you know?

--
Ariel Rocholl
Madrid, Spain

2006\10\18@130606 by Peter Gelsi

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face
Try this data for Hall Effect UGN3503 device. Has some examples.

http://www1.jaycar.com.au/products_uploaded/ZD1902.pdf

Peter

Ariel Rocholl wrote:

>I need to measure, then A/D convert into something a PIC can use, DC
>currents from 1A to 100A. I was told this should be feasible with hall
>effect sensors, but the application notes I see in freescale and others are
>apparently more orientated to detect movement of magnetic elements, for
>instance to work as a tachometer.
>Does anyone has experience using hall effect sensor for DC current measure?
>Any application note you know?
>
>  
>

2006\10\18@131607 by Harold Hallikainen

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flavicon
face

> I need to measure, then A/D convert into something a PIC can use, DC
> currents from 1A to 100A. I was told this should be feasible with hall
> effect sensors, but the application notes I see in freescale and others
> are
> apparently more orientated to detect movement of magnetic elements, for
> instance to work as a tachometer.
> Does anyone has experience using hall effect sensor for DC current
> measure?
> Any application note you know?
>
> --
> Ariel Rocholl
> Madrid, Spain

See http://www.allegromicro.com/hall/currentsensor.asp for Hall effect
current sensors.

Harold

--
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!

2006\10\18@131901 by Marcel duchamp

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Ariel Rocholl wrote:
> I need to measure, then A/D convert into something a PIC can use, DC
> currents from 1A to 100A. I was told this should be feasible with hall
> effect sensors, but the application notes I see in freescale and others are
> apparently more orientated to detect movement of magnetic elements, for
> instance to work as a tachometer.
> Does anyone has experience using hall effect sensor for DC current measure?
> Any application note you know?
>

Check out Allegro ACS755LCB-100-PFF (DIGIKEY 620-1111-ND). It's a 100
Amp sensor based on a Hall effect device.

2006\10\18@145728 by Richard Prosser

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Check out the NVE GMR magnetic sensors - not hall effect but can be
used to measure current. I think they have examples on their website
of using them for current measurement

We used to use a Honeywell part but I think it is now obsolete.

Two main things to watch when using magnetic sensors to measure
current - core saturation and remenance. Core saturation will cause
non-linearity at the higher current levels unless a lot of "iron" is
used - and then the sensitivity drops. Remenence will reduce accuracy
as previous history will effect the present reading.(Especially if the
current is bi-directional) In order to counter both effects, one
method is to use the output of the sensor to control a current drive
though a coil to cancel the measured field. The measured current is
then simply the canceling current multiplied by the number of turns in
the cancelling coil. (But for 100A and 1000 turns you still need 100mA
coil current - and if this is provided by a SMPS then it may induce
noise on the measured current).

Google for "flux-gate" to see another method.

Richard P

On 19/10/06, Marcel duchamp <spam_OUTmarcel.duchampTakeThisOuTspamsbcglobal.net> wrote:
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> -

2006\10\18@152056 by Ariel Rocholl

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Thank you all, I have what I need with all these info. Allegro and NVE GMR
devices look good for this and found a nice app note on their website.

Appreciate the help.


2006/10/18, Richard Prosser <.....rhprosserKILLspamspam@spam@gmail.com>:
{Quote hidden}

2006\10\18@153939 by Peiserma

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piclist-bounces@mit.edu wrote:
> See http://www.allegromicro.com/hall/currentsensor.asp for Hall
> effect current sensors.

I've used their ACS706 series with success. They even sell an evaluation
board, which is nothing more than the chip, one cap, and some mounting
holes. But it saves you from having to spin your own pcb.

2006\10\18@175542 by rlistas

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Hi Ariel,

I´m using hall current sensors from Allegro
(ACSxxx). They have some parts
for +- 100A, output linear 0-5v from
-100A to 100A (0A = 2,5V).
Easy to use with a PIC AD.

good luyck!

Rubens

At 13:47 18/10/2006, you wrote:
{Quote hidden}

>

2006\10\18@235147 by Shawn Wilton

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Allegro will send you free samples if you ask.



On 10/18/06, rlistas <.....rlistasKILLspamspam.....gmail.com> wrote:
{Quote hidden}

> >-

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