Patent ID: 7915833

Claim:
A circuit comprising: a capacitor having a first terminal and a second terminal; a low-side switching element having a first terminal connected to the first terminal of the capacitor, and having a second terminal; a high-side switching element having a first terminal connected to the second terminal of the capacitor, and having a second terminal; a first primary winding having a first terminal connected to the first terminal of capacitor, and having a second terminal connected to the second terminal of the high side switching element; a second primary winding having a first terminal connected to the second terminal of the capacitor, and having a second terminal, wherein the first terminal of the second primary winding is connected to the second terminal of the first primary winding through the high-side switching element; and a secondary winding magnetically coupled to the first and second primary windings; wherein the first primary winding having a first voltage drop from the first terminal of the first primary winding to the second terminal of the first primary winding; and the second primary winding having a second voltage drop from the first terminal of the second primary winding to the second terminal of the second primary winding; further wherein the first voltage drop and the second voltage drop have the same algebraic sign.