grizedale
Advanced Member level 3
Hello,
Please can you explain the current flow path in my recent AC mains electrocution?.........
I was working at a Flat Screen television company.
We were testing the Flyback SMPS that supplies the TV electronics....We had supplied the flyback through an isolation transformer , but when i touched the flyback circuit with a single finger, i got an electric shock....how?
One thing i do know is that the senior engineers, for a joke, often used to snip off the 1 Megohm resistors which connected the primary and secondary of the flyback. (from primary gnd to secondary gnd)
I believe that thes 1Meg resistors were there to discharge the seconday, (ie. to prevent the secondary from floating up to a high voltage via the Y caps which connect primary to secondary)
So with the 1Meg resistors snipped away, my secondary circuit floated up to a high voltage , then when i touched it, a capacitive current flowed through the Mains, through the winding capacitance of the isolation transformer, through the Y Cap, through me, then to earth ground?
Is this right?
Please can you explain the current flow path in my recent AC mains electrocution?.........
I was working at a Flat Screen television company.
We were testing the Flyback SMPS that supplies the TV electronics....We had supplied the flyback through an isolation transformer , but when i touched the flyback circuit with a single finger, i got an electric shock....how?
One thing i do know is that the senior engineers, for a joke, often used to snip off the 1 Megohm resistors which connected the primary and secondary of the flyback. (from primary gnd to secondary gnd)
I believe that thes 1Meg resistors were there to discharge the seconday, (ie. to prevent the secondary from floating up to a high voltage via the Y caps which connect primary to secondary)
So with the 1Meg resistors snipped away, my secondary circuit floated up to a high voltage , then when i touched it, a capacitive current flowed through the Mains, through the winding capacitance of the isolation transformer, through the Y Cap, through me, then to earth ground?
Is this right?