A magnetron driver with half-bridge LLC resonant converter for microwave oven

This paper depicts a magnetron driver with half-bridge LLC resonant converter for microwave ovens. The designed driver contains a diode rectifier, a half-bridge switching inverter, an LLC transformer resonant tank and a diode-capacitor full-wave voltage doubler. Input voltage and output current are sensed and sent to a 16 bit digital signal controller for power control. The controller varies the switching frequency to regulate output current and achieve zero-voltage switching. Its output is similar to a current source. To verify the analysis and design, a one-kilo watts half-bridge driver is built. Experimental results demonstrate the LLC converter suits this application.