Power transmission and control method of magnetron power supply for microwave oven

Abstract

The invention belongs to the power supply power transmission and control technology field and relates to a magnetron power supply power transmission and control method used for a microwave oven. During manual gear control, working time is set, whether a given power control panel is given power gear is determined; If the given power control panel is the given power gear, a working state is entered into; then a size of the given power gear is determined; a single chip microcomputer is used to control a circuit so as to determine a required switch frequency and a duty ratio and output a PWM driving waveform; simultaneously an input voltage and a current value are detected so that the single chip microcomputer outputs a PWM blockade signal at the working time or after manual interruption; If overvoltage, undervoltage or overcurrent conditions are generated, automatic alarm is performed and the single chip microcomputer outputs the PWM blockade signal; During automatic catch control, a menu function key on the microwave oven is pressed down, after completion, the single chip microcomputer outputs the PWM blockade signal and work is stopped. The control method is simple, output power is continuous and adjustable, a circuit structure is novel, a principle is reliable, output power is large, manufacturing cost is low, a service life is long, a market prospect is good and an application environment is friendly.

Description

Technical field: [0001] The invention belongs to the technical field of electrical power transmission and control, and relates to a power transmission control method for a magnetron power supply topology of a microwave oven, in particular to a power transmission and control method for a magnetron power supply for a microwave oven. Background technique: [0002] At present, the traditional power supply for microwave ovens is mostly power frequency step-up power supply, which adopts power frequency transformer to boost high-voltage power to supply power to the magnetron. The pollution is serious, and the output voltage of the traditional microwave power supply cannot be adjusted, and the power can only be adjusted by changing the intermittent working time of the power supply; the intermittent power supply mode adopted by the power supply will not only affect the service life of the magnetron, but also make the cooking effect of the food Greatly discounted, destroying the nutri...

AI Technical Summary

Problems solved by technology

Now commonly used resonant converters include series resonant converters, parallel resonant converters, series-parallel resonant converters and relatively new LLC resonant converters. The above-mentioned converters are based on full-bridge or half-bridge inverter topologies. It can only be realized, and its circuit structure is relatively complex, the volume is relatively large, the cost is high, the reliability is low, and the control is troublesome.

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