Power-supply unit for electronic oven

摘要

A Hall element (H) is arranged at an air gap of a choke coil ( 30 ). Power semiconductor elements (P 1 ) and (P 2 ) are attached to a heat radiation fin ( 61 ) directly by soldering. A rectangular-hollow-shaped metal core ( 27 ) is formed by winding a long metal thin plate multiple turns into a rectangular-hollow-shape and is fitted to a bar shaped ferrite core ( 26 ) from outside of the primary winding ( 21 ) and the secondary winding ( 22 ). The inner diameter of one side of the rectangular-hollow-shape core is larger than both outer diameters of the primary winding ( 21 ) and the secondary winding ( 22 ) and the inner diameter of the other side of the rectangular-hollow-shape core is larger than the height of the primary winding ( 21 ) and the secondary winding ( 22 ). The rectangular-hollow-shape ( 27 ) core is arranged such that an air gap (G) exists between the rectangular-hollow-shape core ( 27 ) and the bar shaped ferrite core ( 26 ).