Powered microwave oven

A microwave oven capable of operating from external AC line power and from DC input power available on transport, comprising:

• a microwave oven housing enclosing a heating chamber and having, a door for access to the chamber, a source of microwave energy, interlock safety means for preventing external radiation of microwave energy when the door is opened and enabling energizing of the microwave source when the door is closed;
• first inverter means for generating internal AC power from DC input power;
• means for generating a high voltage for energizing the microwave source, said latter means including second inverter means for generating, in response to said internal AC power, said high voltage from said DC input power and AC means for generating said high voltage from external AC line power;
• and
• switch means for selectively coupling one of said internal AC power and said external AC line power, through the interlock means, to the second inverter means for drive thereof or the AC means;
• whereby said source is energized with high voltage from either said external AC line power or said DC input power while preserving safety provided by said interlock safety means.