Microwave oven grilling tube power conditioning circuit

Abstract

The invention discloses a microwave oven grilling tube power conditioning circuit comprising a grilling tube, a CPU controller, a relay, a relay-control triode controllably connected with the CPU controller, a photoelectric coupler, and a triac. The CPU controller inputs a controlling signal into an input end of the photoelectric coupler through a switching triode; two output ends of the photoelectric coupler are respectively connected with T2 and T1 of the triac TC through resistors R1 and R2; alternating current is connected into the T2 pole of the triac TC through the relay; the T1 pole of the triac TC is connected to an electrical connection end of the grilling tube; and the other electrical connection end of the grilling tube is connected with a power source supply circuit, such that a circuit is formed. With the circuit provided by the invention, a heating controlling period is shortened to 20ms; time controlling is more precise; and real linearity of power control is realized through chopping upon voltage. With the linear control upon the power, heating power is more uniform, a heating process is improved, diversified grill functions are realized, and food quality is improved.

Description

technical field [0001] The invention relates to a control method, in particular to a power regulating circuit during barbecue. Background technique [0002] In the prior art, whether it is an oven or a microwave oven with a barbecue function, when performing the barbecue function, it is an electric heating appliance that uses the radiant heat emitted by the electric heating element to bake food. According to the different needs of the baked food, the temperature of the microwave oven Generally, it can be adjusted within the range of 50-250°C. [0003] When performing the grilling function, the user first sets the grilling temperature and grilling time, the main control chip activates the electric heating element to start heating the food, the temperature sensor senses the temperature in the grilling cavity and compares it with the set temperature, when the set temperature is reached When the main control chip determines that the temperature set by the user has been reached,...

AI Technical Summary

Problems solved by technology

[0004] In the microwave oven control process of the prior art, the power control is mainly realized through the on-off of the electric heating element. At a certain point in time, the power is only in two forms: 100% and zero power. The power is reflected as 100% full power for 60% of the time, and zero power for 40% of the time, and frequently switches between 100% and zero power during this time period to ensure that the temperature continues to rise, due to the switching of the grill tube power now It is realized by triode control relay, the minimum control time is 1s, the time is not delicate enough, and the fire power is realized by the energy supply of the barbecue tube, the power switching causes the barbecue to not fully reflect the characteristics of the food, even if it is equipped with sensors to monitor, this is also It may cause the food to be over-grilled or not achieve the desired grilling effect

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