Patent ID: 6023214
Filing Date: 2000-02-08
Classification: H01F

Abstract:
A sheet transformer comprising:a plurality of single-turn coil substrates each of which comprises a single-turn coil pattern formed on a substrate;a plurality of multiple-turn coil substrates each of which comprises a multiple-turn coil pattern formed on a substrate;a primary coil formed by overlaying at least one of said plurality of single-turn coil substrates and at least one of said plurality of multiple-turn coil substrates, said primary coil having a higher potential side and a lower potential side;a secondary coil formed by overlaying at least one of said plurality of single-turn coil substrates and at least one of said plurality of multiple-turn coil substrates, said secondary coil having opposite first and second coil ends;said primary coil and said secondary coil being overlaid, wherein said at least one of said plurality of single-turn coil substrates of said primary coil is positioned closer to said secondary coil than said at least one of said plurality of multiple-turn coil substrates of said primary coil and said at least one of said plurality of single-turn coil substrates of said secondary coil is positioned closer to said primary coil than said at least one of said plurality of multiple-turn coil substrates of said secondary coil;said at least one of said plurality of single-turn coil substrates of said primary coil being located at said higher potential side of said primary coil;a core structure comprising a middle leg core portion disposed in a center of said primary coil and said secondary coil and an outside leg core portion disposed outside said primary coil and said secondary coil, thereby obtaining a magnetic coupling between said primary coil and said secondary coil; anda secondary rectifying element electrically connected to said first coil end of said secondary coil;said higher potential side of said primary coil positioned in an opposed configuration with said second coil end of said secondary coil.