Power-supply unit for electronic oven

摘要

A Hall element (H) is arranged a choke coil (30) having an air gap at the core portion thereof. Power semiconductor elements (P1) and (P2) are attached at a heat radiation fin (61) directly by soldering. A rectangular-hollow-shaped core (27) formed by a metal core winding a long metal thin plate plural turns in rectangular-hollow-shape is fitted to the 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 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 is larger than piled length of the primary winding (21) and the secondary winding (22). At the above state, the rectangular-hollow-shape (27) core is arranged having an air gap (G).