Control method and microwave cooking equipment

Abstract

The invention provides a control method and microwave cooking equipment. The microwave cooking equipment includes a microwave source, a first amplifier and an antenna, wherein the microwave source comprises a digital signal generator, a microwave signal generator, a digital-to-analog converter and a mixer. The control method comprises the steps that phase conversion is performed on an initial signal generated by the digital signal generator to obtain an output signal of the digital signal generator, the digital-to-analog converter performs digital-to-analog conversion on the output signal of the digital signal generator to obtain an analog signal, the mixer mixes the analog signal and the microwave signal generated by the microwave signal generator, and then the mixer outputs the microwave signal after phase conversion to the first amplifier. According to the control method, phase conversion of the microwave signal is realized by performing phase conversion on the initial signal of the digital signal generator, so that the precision of phase control of the microwave signal is relatively high, a phase processing algorithm does not need to occupy more design space of a circuit board, and miniaturization design of a microwave source is facilitated.

Description

technical field [0001] The invention relates to the field of microwave heating, and more specifically, to a control method and microwave cooking equipment. Background technique [0002] In related technologies, devices using semiconductor radio frequency energy heating can use a method similar to radar phased arrays to achieve zone heating. The principle of phased arrays is to adjust the phase difference between multiple channels so that the beams of microwave radiation can be flexibly adjusted, thereby Achieve the effect of using microwave energy to realize zone heating. The traditional way to adjust the phase of radio frequency microwave signal is to change the phase by switching to microstrip lines of different lengths through switches. However, the method of changing the phase by extending the microstrip line is the design method of the hardware analog circuit. The delay generated by the transmission of the microwave signal on the microstrip line is used to change the m...

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Problems solved by technology

However, the method of changing the phase by extending the microstrip line is the design method of the hardware analog circuit. The delay generated by the transmission of the microwave signal on the microstrip line is used to change the microwave phase. The disadvantage is that the phase control accuracy is low, and when the phase transformation is relatively When it is large, the microstrip line is too long, occupying a large space on the PCB circuit board, resulting in an increase in the overall size of the microwave source module, and it is not conducive to accurate detection of the phase of the signal

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