ANALYSIS AND OPTIMIZATION OF A FLYBACK CONVERTER WITH A NONDISSIPATIVE SNUBBER

The paper explores the optimum design of a nondissipative snubber empl oyed in a PWM-controlled flyback convertor. A simple but efficient tra nsistor model was used to evaluate the switching loss. An optimum snub ber capacitor value was defined, providing minimum total losses in the snubber network. Owing to the snubber, the operating frequency region of the IGBT transistor used was significantly extended. A 850 W conve rtor prototype for microwave heating was built and tested to verify th e theoretical results.