One-Chip Class-E Inverter Controller for Driving a Magnetron

A one-chip class-E inverter controller is implemented in a 0.35 mum standard CMOS process. The control IC generates a control signal to turn on or off the insulated-gate bipolar transistor switch of the class-E inverter power supply driving a magnetron load which generates 2.45 GHz microwave for heating. It provides active power factor correction, soft start, and thermal protection. The rated RF output power of the magnetron is around 1.2 kW for a 100 V AC line, and an input power factor of over 0.98 is maintained. The proposed integrated solution gives better system performance with lower cost than conventional discrete solutions.