Patent ID: 6335520
Filing Date: 2002-01-01
Classification: H05B

Abstract:
A microwave oven comprising a power supply part supplying alternating current (AC) power, a rectifying and filtering part rectifying and filtering the commercial AC power, a high voltage transformer generating a high voltage by means of direct current (DC) power from the rectifying and filtering part, and a magnetron generating electromagnetic waves based on the high voltage from said high voltage transformer, further comprising:a control signal generator part generating a control signal; an inverter part converting the DC power from said rectifying and filtering part into a high voltage AC power in accordance with the control signal from said control signal generator part, and a control part blocking the control signal converted through said inverter part from being applied to the magnetron if the converted control signal is not within a predetermined range, said control part preventing the control signal from entering into said inverter part where the control signal is not within the predetermined range, said control part comprising: a D/A converter part converting the control signal from said control signal generator part into an analog signal; a detector part detecting whether the control signal converted by said D/A converter part is within the predetermined range; an output control part controlling an output of the control signal passing through said detector part; and an oscillator part varying the control signal outputted by said output control part and inputting the varied control signal into said inverter part.