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  • TI Thinks Resolved

TIDA-00637: Request use of GFCI test and rest of part number and information

Prodigy 20 points

Replies: 1

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Part Number: TIDA-00637

Dears,

Please kindly help to share with below infromation

1. Part # and Vendor's name of CT on page 27 (Figure 22. system as tested)?

2. Part # and Vendor's name of J1772 CABLE(Figure 22. system as tested)? 

2. Question with  test result Pic on Page 32.

- Is Blue line  Final GFCI TEST SIGNAL and red line is measured on  MCU I/O pin?

- Is that correct that blue line is test result that measured on X6-1 connect pin?

- Is Red line is signal of GFCI Fault singal or GFCI+?

3. Use for GFCI TEST SIGNAL 

- Is GFCI TEST SIGNAL just for test to check on right activation physically on EVSE reference board? 

- Does it mean that MCU make 2Khz freq, and make activate coil on CT and op-amp amplify loopback signal from CT and MCU recongnize this signal?

 

  • Mark,

    1. We used a high accuracy 2000:5 (or 100:1) CT. This is an older design that I do not have on hand any longer, but I believe it was a CR Magnetics CR8 series transformer.

    2. Any standard J1772 cable can work, we didn't have any specific part number for this. There are many options on sites like Amazon.

    3. The blue line is the output op X6-1 (GFCI_TEST), and the red line is GFCI_FAULT

    4: Correct, GFCI_TEST just injects a current into the CT to ensure that the system is operating correctly.

    As a note, this GFCI subsystem was not tested to full UL or ANSI specifications, and is just a guideline on how a system like this could be developed. 

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