Patent ID: 6373736
Filing Date: 2002-04-16
Classification: H01F,H05K

Abstract:
An isolated converter comprising a multilayer sheet transformer comprising a multilayer circuit board having a plurality of sheet substrates, a coil pattern forming a primary coil and a coil pattern forming a secondary coil disposed coaxially on the sheet substrates, the coil patterns comprising a coil pattern unit, and further comprising a core member for the coil pattern unit, wherein;said multilayer circuit board has a first area where a primary-side circuit coupled to a primary coil of the multilayer sheet transformer is disposed, a second area where the multilayer sheet transformer is disposed, and a third area where a secondary-side circuit coupled to a secondary coil of the multilayer sheet transformer is disposed, said areas being located in order; and wherein coil patterns formed on outer surfaces of top and bottom sheet substrates of said multilayer sheet transformer are for the same coil, either primary coil or secondary coil, and wherein, where the coil patterns formed on the outer surfaces of the top and bottom layers are for the primary coil, the multilayer sheet transformer is regarded as a part of the primary-side circuit and an isolation gap for providing electrical isolation between the primary-side circuit and secondary-side circuit is disposed between the multilayer sheet transformer and the third area in which the secondary-side circuit is disposed, and wherein where the coil patterns formed on the outer surfaces of the top and bottom layers are for the secondary coil, the multilayer sheet transformer is regarded as a part of the secondary-side circuit and an isolation gap for providing an electrical isolation between the primary-side circuit and secondary-side circuit is disposed between the multilayer sheet transformer and the first area in which the primary-side circuit is disposed.