Re: [EE] Isolated AC line current sensors

Thanks! I looked at some Allegro parts earlier, but did not see this one.
The fact that it does RMS calculations (and a bunch ofther stuff) is nice!

Harold


On Mon, July 21, 2025 7:53 pm, Brent Brown wrote:
> Hi Harold,
>
>
> My (sometimes) friend CGPT says a popular hall effect type current sensor
> is the Allegro Microsystems ACS37800, with internal shunt (models us to
> +/-30A),
> isolation, I2C/UART interface (ACS37002 has analog output if that suits
> better). Measures voltage too (I guess then the isolation reduces but can
> still be made appropriately safe) and calculates power etc. Looks pretty
> cool, nice to have all the essentials in one package.
>
> Brent
>
>
> On 21 Jul 2025 at 17:05, Harold Hallikainen wrote:
>
>> I've been asked about sensing current on the AC line. Current
>> transformers immediately come to mind. Also, I see there are Hall effect
>> based sensors (similar to current transformers, but using a Hall effect
>> device instead of a secondary winding). For isolation, I also see linear
>> optocouplers, that have two photosensors so the LED current can be
>> servoed. Another method would be a current sense resistor with an
>> isolation amplifier.
>>
>> I remember years ago an LTC RMS to DC converter that measured the
>> temperature of a heater. It SEEMS like there could be a chip equivalent
>> of a thermocouple ammeter with an electrically isolated heater and a
>> temperature sensor.
>>
>> Other ideas?
>>
>>
>> Thanks!
>>
>>
>> Harold
>>
>
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