Forums

little pcb-mount CTs

Started by John Larkin May 4, 2015
Anybody know of a source for a small (1 amp range) PCB mount current
transformer? Frequency will be around 400 Hz.

There are switcher current sense CTs, but I don't know if they will
work that low.

Or maybe I could use a shunt and a voltage-mode (audio) transformer.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

On 5/4/2015 5:17 PM, John Larkin wrote:
> > Anybody know of a source for a small (1 amp range) PCB mount current > transformer? Frequency will be around 400 Hz. > > There are switcher current sense CTs, but I don't know if they will > work that low. > > Or maybe I could use a shunt and a voltage-mode (audio) transformer. > >
Triad CSE184L ??
Den tirsdag den 5. maj 2015 kl. 00.17.18 UTC+2 skrev John Larkin:
> Anybody know of a source for a small (1 amp range) PCB mount current > transformer? Frequency will be around 400 Hz. > > There are switcher current sense CTs, but I don't know if they will > work that low. > > Or maybe I could use a shunt and a voltage-mode (audio) transformer. >
isn't the difference basically what side the shunt is on? -Lasse
On Mon, 4 May 2015 15:37:50 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>Den tirsdag den 5. maj 2015 kl. 00.17.18 UTC+2 skrev John Larkin: >> Anybody know of a source for a small (1 amp range) PCB mount current >> transformer? Frequency will be around 400 Hz. >> >> There are switcher current sense CTs, but I don't know if they will >> work that low. >> >> Or maybe I could use a shunt and a voltage-mode (audio) transformer. >> > >isn't the difference basically what side the shunt is on? > >-Lasse
Sure, but if I use a shunt (like, 0.1 ohms) on the high side, I can use a dinky audio transformer that has any amount of copper resistance, 10s of ohms maybe, to couple the signal down into my ADC. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Mon, 04 May 2015 17:34:47 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 5/4/2015 5:17 PM, John Larkin wrote: >> >> Anybody know of a source for a small (1 amp range) PCB mount current >> transformer? Frequency will be around 400 Hz. >> >> There are switcher current sense CTs, but I don't know if they will >> work that low. >> >> Or maybe I could use a shunt and a voltage-mode (audio) transformer. >> >> > >Triad CSE184L ??
Nice part, good price. If anybody stocks it! Thanks -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Den tirsdag den 5. maj 2015 kl. 00.52.20 UTC+2 skrev John Larkin:
> On Mon, 4 May 2015 15:37:50 -0700 (PDT), Lasse Langwadt Christensen > <langwadt@fonz.dk> wrote: > > >Den tirsdag den 5. maj 2015 kl. 00.17.18 UTC+2 skrev John Larkin: > >> Anybody know of a source for a small (1 amp range) PCB mount current > >> transformer? Frequency will be around 400 Hz. > >> > >> There are switcher current sense CTs, but I don't know if they will > >> work that low. > >> > >> Or maybe I could use a shunt and a voltage-mode (audio) transformer. > >> > > > >isn't the difference basically what side the shunt is on? > > > >-Lasse > > Sure, but if I use a shunt (like, 0.1 ohms) on the high side, I can > use a dinky audio transformer that has any amount of copper > resistance, 10s of ohms maybe, to couple the signal down into my ADC. >
exactly so it is mostly a matter of what is easiest to find -Lasse
On Monday, May 4, 2015 at 3:17:18 PM UTC-7, John Larkin wrote:
> Anybody know of a source for a small (1 amp range) PCB mount current > transformer? Frequency will be around 400 Hz.
Any transformer, with a shunt resistance on the secondary, is a current transformer. Why not go with Coilcraft LPR6235 series <http://www.coilcraft.com/lpr6235.cfm> Or, do you need some other features (open hole for primary wire, UL listing...)?
On 5/4/2015 5:56 PM, John Larkin wrote:
> On Mon, 04 May 2015 17:34:47 -0500, John S <Sophi.2@invalid.org> > wrote: > >> On 5/4/2015 5:17 PM, John Larkin wrote: >>> >>> Anybody know of a source for a small (1 amp range) PCB mount current >>> transformer? Frequency will be around 400 Hz. >>> >>> There are switcher current sense CTs, but I don't know if they will >>> work that low. >>> >>> Or maybe I could use a shunt and a voltage-mode (audio) transformer. >>> >>> >> >> Triad CSE184L ?? > > Nice part, good price. If anybody stocks it! > > Thanks
How many do you need?
On Mon, 04 May 2015 18:33:21 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 5/4/2015 5:56 PM, John Larkin wrote: >> On Mon, 04 May 2015 17:34:47 -0500, John S <Sophi.2@invalid.org> >> wrote: >> >>> On 5/4/2015 5:17 PM, John Larkin wrote: >>>> >>>> Anybody know of a source for a small (1 amp range) PCB mount current >>>> transformer? Frequency will be around 400 Hz. >>>> >>>> There are switcher current sense CTs, but I don't know if they will >>>> work that low. >>>> >>>> Or maybe I could use a shunt and a voltage-mode (audio) transformer. >>>> >>>> >>> >>> Triad CSE184L ?? >> >> Nice part, good price. If anybody stocks it! >> >> Thanks > >How many do you need? >
It would be for production, so we'd need a dependable supply. Two distributors who list it show no stock. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Mon, 4 May 2015 16:26:02 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

>On Monday, May 4, 2015 at 3:17:18 PM UTC-7, John Larkin wrote: >> Anybody know of a source for a small (1 amp range) PCB mount current >> transformer? Frequency will be around 400 Hz. > >Any transformer, with a shunt resistance on the secondary, is a current transformer. >Why not go with Coilcraft LPR6235 series > ><http://www.coilcraft.com/lpr6235.cfm> > >Or, do you need some other features (open hole for primary wire, UL listing...)?
The ones with low primary DCRs also have low L/R time constants, so wouldn't work very well at 400 Hz. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com