Abstract: A method for controlling an electromagnetic heating device includes: obtaining a sampling current obtained by a current sampling apparatus detecting a main loop in which an electromagnetic oscillation and power output circuit of an electromagnetic heating device is located; detecting, according to the sampling current and preset determining data, whether the electromagnetic heating device accommodates a medium; and controlling, if the electromagnetic heating device does not accommodate a medium, the electromagnetic oscillation and power output circuit to stop electromagnetic oscillation.

Abstract: The utility model discloses a novel open-type photo frame, comprising the photo frame of four frames with upper, lower, left and right frame; the upper frame comprises a fixed frame and a movable cover rotatably connected to the top front side of the fixed frame through the rotating shaft; the fixed frame is provided with circlips on the bottom of the front side for limiting the movable cover, and inside the movable cover is provided with a slot near the rotating shaft to match with the circlips; the left and right frame is provided with sliding grooves inside, and the lower frame is provided with a limiting groove inside; sliding grooves and the limiting groove are provided with a base plate and a transparent acrylic plate inside; the back of the frame is provided with grooves.