| 摘要 |
PURPOSE: A circuit for attenuating inrush current in a microwave oven is provided to attenuate inrush current, generated when initial power is supplied to an oscillation circuit to drive each RF generator, in a microwave oven comprising at least two RF generators. CONSTITUTION: The first oscillation circuit part(30) to oscillate the first magnetron(36) and the second oscillation circuit part(40) to oscillate the second magnetron(36) are connected for a power supply unit in parallel. The first oscillation circuit part(30) consists of a fuse(fuse3), the first safety switch(31), the first inrush current attenuation circuit, the first monitor switch(32), and the first RF generator(35). The fuse(fuse3) protects the circuit by being melted when overcurrent is generated. The first safety switch(31), interfaced with the on/off of the door of the microwave oven, intermits power supplied to the circuit part(30). The first inrush current attenuation circuit attenuates inrush current generated at the first oscillation circuit part(30). In case that current flows on the circuit due to the malfunction of the first safety switch(31), the first monitor switch(32) forms a short circuit and stably interrupts the current on the circuit by melting a fuse(fuse1). The first RF generator(35) comprises the first magnetron(36) and a high voltage transformer(HVT1). The high voltage transformer(HVT1) supplies oscillation power to the first magnetron(36).
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