AC voltage at the output terminal in AC to DC converter w.r.t. ground
I have designed an SMPS which supplies 12 volt DC and output current up to 7 amps and the input is 230 volt AC. I have used Linkswitch IC(LNK6666E) for this design and it is working nice but multimeter shows an AC voltage of approximately 56 volts between the output pin and the ground pin of AC mains. This voltage can cause an electric shock when a person is connected to ground so what is the reason of that AC phase at the output terminal what should I do to get rid of this AC voltage.
Comments
Hi,
Since you mentioned that the design is working fine then. I believe that the output capacitor is working fine and is greater than >16VDC rating. It is expected that if you measure from the output pin (positive terminal of your output capacitor) to your Line or Neutral an AC voltage is present. can you check if connecting the (negative terminal of your output capacitor) to earth ground removes the AC voltage that you measured?
No, there is an AC voltage of 82 volts between the negative terminal of output capacitor to earth ground. And the same voltage is between negative terminal of output capacitor and earth ground.
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| Schematic.pdf (52.24 KB) | 52.24 KB |
Hi, Can you share also your transform datasheet and PCB if possible?
Where you able to load the board upto its maximum 12V 6A Rating?
Hi,
Thanks for using power integrations device. Can you please send me the schematic?
can you verify if the input voltage is wide range 90 to 265VAC ? What is the value of your Y-Cap? And the bleeder resistors on the input?