Electronic transformer and a microwave cooking appliance

A microwave cooking appliance, comprising an electronic transformer and a microwave generator connected to the electronic transformer;

• wherein the electronic transformer comprises:
• a rectifier connected to an AC source;
• a transformer connected to the rectifier;
• a switch configured to provide an on/off signal to the transformer;
• a controller connected to the switch, and configured to generate a control signal according to a preset power to the switch and control a switching frequency of the switch based on the control signal;
• a voltage doubler rectifier connected to a secondary side of the transformer, and configured to increase an output voltage of the transformer;
• a primary winding connected to the switch, with a winding width greater than a stack height of the primary winding;
• and
• a secondary winding spaced apart from the primary winding, with a winding width smaller than a stack height of the secondary winding;
• wherein the controller comprises a detector and a processor, the detector is configured to obtain a detection signal based on detection to the AC source and send the detection signal to the processor, and the processor is configured to control the switching frequency of the switch based on the detection signal;
• wherein the electronic transformer further comprises a first sampler connected to an output terminal of the AC source and the detector respectively, and the detector is configured to collect the detection signal through the first sampler;
• wherein the stack height of the secondary winding and the winding width of the secondary winding satisfy a following formula:
• 1.1<H2/W2<2.5,
• where H2 represents the stack height of the secondary winding, and W2 represents the winding width of the secondary winding.