Patent ID: 8829870

Claim:
A voltage conversion apparatus having a first loop circuit and a second loop circuit which share an inductance component, in which a current passes through the first and second loop circuits alternately in accordance with ON/OFF operation of a first switching element provided in the first loop circuit, wherein a direction of a magnetic field through the first loop circuit generated at the ON operation of the first switching element in the first loop circuit is the same as a direction of a magnetic field through the second loop circuit generated at the OFF operation of the first switching element in the first loop circuit subsequent to the ON operation, the first loop circuit and the second loop circuit are provided on a front face and a back face of a printed circuit board, respectively, in such a manner that the first loop circuit and the second loop circuit are opposed to each other in a direction normal to the respective loop circuits, a heat sink is provided on one of the front face or the back face of the printed circuit board, and a solid pattern of a metal material is provided on an inner layer of the printed circuit board, said solid pattern being connected to the heat sink via a through hole that is formed in the printed circuit board.