Insulation type step-down converter

An insulation type step-down converter comprising:

• a core including a middle leg, a first outer leg spaced from the middle leg and arranged to extend in a direction identical to the middle leg, and a second outer leg spaced from the middle leg opposite to the first outer leg;
• a primary-side coil wound around the middle leg;
• first and second secondary-side coils arranged between the first outer leg and the middle leg, overlapping at least part of the primary-side coil, the first and second secondary-side coils being spaced from each other;
• third and fourth secondary-side coils arranged between the second outer leg and the middle leg, overlapping at least part of the primary-side coil, the third and fourth secondary-side coils being spaced from each other;
• and
• first, second, third, and fourth rectifier elements connected to the first, second, third, and fourth secondary-side coils, respectively,
• the first, second, third, and fourth rectifier elements being configured to perform rectification such that electric currents flow alternately only in one of the first and second secondary-side coils and one of the third and fourth secondary-side coils, and electric currents flowing simultaneously in one of the first and second secondary-side coils and one of the third and fourth secondary-side coils are opposite in direction to each other so as to cancel out a magnetic flux passing through the middle leg each time when electric current flowing in the primary-side coil is changed in direction.