Variable frequency type frequency conversion microwave oven and its control method

Abstract

A variable-frequency inverter microwave oven and a method for controlling the same. The inverter microwave oven comprises a magnetron for generating electromagnetic waves, a direct current (DC) voltage generator for rectifying and smoothing a commercial alternating current (AC) voltage, which is an inverter drive voltage, to generate a DC voltage, and a switching device for performing a switching operation based on the DC voltage from the DC voltage generator to generate an AC voltage for the driving of the magnetron. The switching device includes a plurality of switches turned on / off in response to the DC voltage from the DC voltage generator. The microwave oven further comprises a variable-frequency controller for varying a switching frequency of the switching device according to the level of the DC voltage from the DC voltage generator to maintain the AC voltage from the switching device at a constant level, and a magnetron drive voltage generator for converting the AC voltage from the switching device into a high-power DC voltage and transferring the converted DC voltage to the magnetron to drive it. The inverter operation is improved compared with a conventional one and a magnetron drive duration is lengthened, thereby improving heating efficiency and operational reliability of the microwave oven.

Description

technical field [0001] The present invention relates to a variable-frequency microwave oven and its control method, in particular to a power supply of constant size for the magnetron that generates electronic waves in the microwave oven, prolonging the driving time of the magnetron and improving heating. Frequency-variable inverter microwave oven with efficiency and reliability of inverter operation and its control method. Background technique [0002] FIG. 1 is a configuration diagram of a general inverter microwave oven. The configuration and driving principle of a conventional inverter microwave oven will be described below with reference to this diagram. [0003] A microwave oven is a cooking machine that uses medium heating and utilizes high frequencies. The above-mentioned medium heating method is to put food into the oven cavity and heat the water molecules contained in the above-mentioned food by radiating microwaves to vibrate. It is different from the ordinary hea...

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Problems solved by technology

[0014] Therefore, since the driving time of the aforementioned magnetron 2 is shortened, the heating efficiency is reduced, and there is a problem that a constant heating output cannot be maintained. Moreover, if the aforementioned industrial AC power supply increases or decreases sharply, the power of the aforementioned switching unit 6 will be reduced. The switching element is damaged and the durability of the product deteriorates

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