Patent ID: 6014326
Filing Date: 2000-01-11
Classification: H02M

Abstract:
A half-bridge voltage transformer circuit, comprising:a first input voltage means for providing a first input voltage;a first switching means, the first switching means electrically coupled to the first input voltage means;a second switching means, the second switching means electrically coupled to a first voltage, the second switching means electrically coupled to the first switching means;a first storage means, the first storage means being electrically coupled to a center tap node and the first input voltage means;a second storage means, the second storage means electrically coupled to the first storage means and a second voltage;a power transformer means, wherein the primary side of the power transformer means includes a power winding having a first terminal and a second terminal and a balance winding having a first terminal and a second terminal, wherein the number of turns on the power winding is equal to the number of turns on the balance winding, wherein the second switching means is electrically coupled to a first terminal of the power winding of the power transformer means; anda means for injecting a correction current proportional to the amount of current flowing in the balance winding, the means for injecting a correction current proportional to the amount of current flowing in the balance winding including a means for sensing the amount of current in the balance winding, the means for sensing the amount of current in the balance winding being electrically coupled to the second terminal of the balance winding.