| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the radiation of an electromagnetic wave noise from an electric circuit board having a high frequency coil without using a magnetic shield material or an electromagnetic shield material.SOLUTION: An electric circuit including a plurality of voltage converter circuits, includes: a first voltage converter circuit including a first switching element (T1) for connecting and disconnecting a current flowing through a first coil (L1) according to a first control signal; and a second voltage converter circuit including a second switching element (T2) for connecting and disconnecting a current flowing through a second coil (L2) according to a second control signal. The first and second coils (L1, L2) are arranged mutually adjacently on the circuit board. Polarities of the first and second coils or the directions of coil currents are set to cancel leakage magnetic fluxes (g1, g2) generated by the first and second coils, respectively, and operations of the first and second switching elements are substantially synchronized with each other.</p> |
