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Switching power supply using printed coil type transformer

  • US 5,659,461 A
  • Filed: 06/19/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 06/30/1994
  • Status: Expired due to Term
First Claim
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1. In a flyback converter using a printed coil type transformer, wherein said flyback converter is arranged so that a switching signal, which is induced in a secondary winding when a direct current input voltage, applied to a primary winding, is turned ON and OFF by a switching element, is smoothed by rectification and fed to a load, and so that an output voltage is detected using a switching signal induced in an auxiliary winding to transmit a control signal to said switching element for the purpose of stabilizing said output voltage;

  • the improvement comprisingsaid primary winding, secondary winding, and auxiliary winding being formed on respective coil formation surfaces of a flat multi-layered coil laminate as conductor patterns between a core hole and a border of said coil formation surface with said core hole being at a center of said conductor patterns; and

    wherein said auxiliary winding is formed on said coil formation surface nearer to said border than to said core hole; and

    wherein said transformer comprises a core type having a center gap disposed in said core hole.

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