POWER SUPPLY CIRCUIT OF DC MICROWAVE OVEN

摘要

PURPOSE: A power supply circuit of a DC microwave oven is provided to be useful for the power supply of external electronic equipment by forming an additional AC power outlet to a DC power circuit of a microwave oven. CONSTITUTION: A DC power circuit includes: a DC power unit(2) generating DC voltage; a switching circuit(4) switched on/off to supply the DC voltage and to cook; an inverter circuit(6) converting the DC voltage into AC; and a magnetron drive circuit(10) for driving a magnetron(12). An HVT(High Voltage Transformer,14) is terminated to AC voltage through a primary coil(14a) while generating high voltage proportional to a winding ratio with the primary coil at secondary coils(14b,14c). A rated AC voltage of 220V is terminated in proportion to a winding ratio with the primary coil at an AC induction coil(14d) of the HVT. To cook with a microwave oven, a first and a second relay(RL1,RL2) are switched on while a third relay(RL3) is switched off. Thereby, the magnetron drive circuit is driven by high pressure at the secondary coil through the switched-on second relay. The magnetron generates microwaves by driving the magnetron drive circuit as the first relay is switched on.