Hi folks!
Please, check my logic. Here is well known schematic of usage AC-DC SMPS (for example, PC):
L – phase wire, N – neutral wire, G – protective Earth.
This scheme is actual for Europe. I don’t know how about US.
I’m in confusing with three questions:
1) Y-capacitors don’t works well – do not suppress symmetrical interference (suppress, but high-frequency only). And only one of them works in low-frequency.
2) Shorts N to G cannot be detected by 1-pole circuit breaker. Returning current will flow thought shorts N+G.
3) N-wire break cannot be detected. Power Supply will works on G-wire until it burn down.
4) A vast of devices have direct connection between secondary (low-voltage) GND and G. What happens if G-path will has lower resistance than N? Power current will flow through G-wire, nor through N. The path of this current will unpredictable.
Am I right?
I’m not a native English speaker, please tell me in simple English. Thanks.
Please, check my logic. Here is well known schematic of usage AC-DC SMPS (for example, PC):
![IMG_20190114_132411.jpg](/forums/proxy.php?image=https%3A%2F%2Fvrzpcw.db.files.1drv.com%2Fy4msaUioOs-ghKnaH8Xgdz4M7zMHxKol8uv2SFLW88zPD7OENu9nX7QeRy8xMpAAac3NtpPrwk8YTnlrYykSK4D7_VTwY4x3xLvIzmfcyE0GhECwHdrPIlbhX8v8mC85G8TbsVgGONVSVVQeaCAjkOzRkarkAakxqvPDFbh0vs1wJpw6sAOv52DMCAywrveNNhlyNhQBf_4dutdrG8QRbwZ9w%2FIMG_20190114_132411.jpg%3Fpsid%3D1&hash=3542ddb0d7322453ed0f0a1d66536141)
L – phase wire, N – neutral wire, G – protective Earth.
This scheme is actual for Europe. I don’t know how about US.
I’m in confusing with three questions:
1) Y-capacitors don’t works well – do not suppress symmetrical interference (suppress, but high-frequency only). And only one of them works in low-frequency.
2) Shorts N to G cannot be detected by 1-pole circuit breaker. Returning current will flow thought shorts N+G.
3) N-wire break cannot be detected. Power Supply will works on G-wire until it burn down.
4) A vast of devices have direct connection between secondary (low-voltage) GND and G. What happens if G-path will has lower resistance than N? Power current will flow through G-wire, nor through N. The path of this current will unpredictable.
Am I right?
I’m not a native English speaker, please tell me in simple English. Thanks.