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Original question:

GFCI

AFE3010: 3 phase GFCI system for Level2 EV charger

Onur AKINCI
Prodigy 10 points
Part Number: AFE3010

Hello everyone,

I am trying to design a 3-phase EV charger circuit so i need to add a ground detection and leakage detection to my design.

I searhed through net and found AFE3010 ic, and looked into its referance schematic in datasheet. And referance to that, i would like to change some components etc. in order to make it compatible with 3 phase 400VAC system(if it is possible of course).

And if it is not possible to implement a 3ph system with this ic, it would be awesome if you point out different ICs or different designs.

Also attached an excel sheet for 220VAC tweak guide for referance schematic that had been shared by Peter Iliya at below thread.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1214799/gfci

AFE3010-BOM_5F00_calculations.xlsx

I am in need of some assistance about this adventure of mine :) 

Thanks in advance.

  • 0
    TI__Mastermind 31635 points

    Hello Valued Engineer,

    I am looking into this and will respond shortly.

    Sincerely,

    Peter

  • 0
    TI__Mastermind 31635 points

    Hello,

    The AFE3010 was not designed to be a single chip solution for multi-phase system. This is especially true if you need your GFCI system to remain operational if ever one of the lines were to become inoperable (which I believe may be a requirement, although I am not an expert on the various regulations).

    The reason is that the AFE3010 must operate in these conditions:

    1. PH pin requires connections to a single line
    2. SCRTST (when SEL=GND) requires half-wave rectified LINE signal through the solenoid.
    3. PH pin needs to know the when the line is negative so it can perform the SCR self-test.
    4. PH and SCRTST need to be connected to the same line.

    So the trick of trying to solve this system with just AFE3010 would have to find a way to OR the various LINE connections to PH and SCRTST.

    The easiest way to use AFE3010 would be to use one AFE3010 for each LINE. These three AFE3010's (and circuits) should be able to share the same current transformer with all of the line and neutral wires going through it.

    Sincerely,

    Peter