A
Adam Seychell
- Jan 1, 1970
- 0
Is it common for people to hand wind their own transformers when
prototyping an off line isolated switching power supplies ?
The construction seems quite labor intensive, considering the
insulation requirements, EMI shielding, and safety regulations.
As a home brewer so I don't have the money to purchase official
standards for insulation and EMI regulations nor do I have the
specialized equipment to test insulation breakdown or accurate winding
machinery, so I've been collecting data from various application notes
on transformer design and dismantling transformers from old computer
power supplies. One of the requirements is a 5 to 6 mm "creepage
distance", and is usually made by creating a gap between each winding
layer and the bobbin side wall, while the insulation layers of
polyester film tape occupies the full width of the bobbin. The
professional built transformers I've seen use a 3 mm width tape as a
margin for each winding layer, and is wound to same thickness of the
copper layer.
With all this work do people go to the trouble or this just one of the
reasons why building off-line SMPS don't make popular hobby pojects ?
Adam.
prototyping an off line isolated switching power supplies ?
The construction seems quite labor intensive, considering the
insulation requirements, EMI shielding, and safety regulations.
As a home brewer so I don't have the money to purchase official
standards for insulation and EMI regulations nor do I have the
specialized equipment to test insulation breakdown or accurate winding
machinery, so I've been collecting data from various application notes
on transformer design and dismantling transformers from old computer
power supplies. One of the requirements is a 5 to 6 mm "creepage
distance", and is usually made by creating a gap between each winding
layer and the bobbin side wall, while the insulation layers of
polyester film tape occupies the full width of the bobbin. The
professional built transformers I've seen use a 3 mm width tape as a
margin for each winding layer, and is wound to same thickness of the
copper layer.
With all this work do people go to the trouble or this just one of the
reasons why building off-line SMPS don't make popular hobby pojects ?
Adam.