Electronics > Projects, Designs, and Technical Stuff
3 phase 4 wire(480V) AC to 12VDC (100mA) power supply for energy metering applic
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capt bullshot:

--- Quote from: capt bullshot on September 09, 2019, 08:40:56 am ---
--- Quote from: Sultanpepper123 on September 09, 2019, 08:37:24 am ---I got the idea to use the module per phase&N solution , but how can i use only one of those with some kind of clever circuitry ?

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Look up reply #3 and reply #4

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Sorry for the (maybe) rude answers. I'm not going into details, since IMHO you _must_ be able to do the math to make these circuits work, and _must_ be aware of the safety related stuff. Giving you a ready made solution would be dangerous if you don't understand all the implications. So I'd recommend you to stay with the three module solution.
Sultanpepper123:

--- Quote from: capt bullshot on September 09, 2019, 09:05:24 am ---
--- Quote from: capt bullshot on September 09, 2019, 08:40:56 am ---
--- Quote from: Sultanpepper123 on September 09, 2019, 08:37:24 am ---I got the idea to use the module per phase&N solution , but how can i use only one of those with some kind of clever circuitry ?

--- End quote ---
Look up reply #3 and reply #4

--- End quote ---

Sorry for the (maybe) rude answers. I'm not going into details, since IMHO you _must_ be able to do the math to make these circuits work, and _must_ be aware of the safety related stuff. Giving you a ready made solution would be dangerous if you don't understand all the implications. So I'd recommend you to stay with the three module solution.


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No not at all. I have no problem in figuring out the math behind the circuits. I'd like to sincerely thank you sir and all the fellow members here in the forums for helping me out.
coppice:

--- Quote from: ogden on September 09, 2019, 08:47:10 am ---
--- Quote from: Sultanpepper123 on September 09, 2019, 08:16:54 am ---
--- Quote from: ogden on September 09, 2019, 07:55:05 am ---Check TI 3phase meter reference design EVM430-F6779 schematics, theres supply you are looking for.

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Thanks checked it, as far as i can tell it's non isolated. I'd be thrilled if it had a transformer.

BTW Is there a way to connect something like the IRM-20-12 mentioned above with the 3 phase 4-wire input?

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Electricity meter do not need isolated supply.

Sent from my F5321 using Tapatalk

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That is true in some cases, and not in others. If the meter stands alone, or is wirelessly connected, isolation is pointless, and the vast majority of products do not have isolation. However, many meters have some form of wired interface to monitoring or reading systems. These need full galvanic isolation for at least a small part of the hardware around the interface.
ogden:
Your 3phase meter mesures voltage and current on each phase how exactly? I doubt it is done using isolated ADC frontends, that would be expensive or even dumb overengineering. As it shall be galvanically connected to neutral then theres no point to use galvanically isolated supply for it.

Sent from my F5321 using Tapatalk

coppice:

--- Quote from: ogden on September 09, 2019, 01:09:57 pm ---Your 3phase meter mesures voltage and current on each phase how exactly? I doubt it is done using isolated ADC frontends, that would be expensive or even dumb overengineering. As it shall be galvanically connected to neutral then theres no point to use galvanically isolated supply for it.

Sent from my F5321 using Tapatalk

--- End quote ---
ADI makes isolated ADC front ends specifically for energy meter applications. Its no longer an expensive way to implement metering.
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