Closed-loop control civilian infrared heat-radiating electric furnace adopting combination switch, and control method thereof

Abstract

The invention relates to the field of heat-radiating furnaces, in particular to a closed-loop control civilian infrared heat-radiating electric furnace adopting a combination switch, and a control method thereof. The heat-radiating electric furnace comprises a temperature setting device, a microprocessor, the combination switch, a load and a temperature sensor. Comparing with the prior art, the heat-radiating electric furnace adopts a temperature negative feedback control technology, the power electronics heating problem is avoided, and the disadvantages of large fan energy consumption, short fan motion part service life and high noise generated from a fan due to the utilization of a cooling fan are avoided effectively; as a power electronic contactless switch and a relay contact switch in parallel connection with the combination switch are used for temperature control, the dual purposes of zero-crossing trigger and low conducting power consumption are realized, and higher harmonic pollution generated by a thyristor pressure regulating technology is avoided; therefore, the domestic heat-radiating electric furnace can perfectly realize the temperature closed-loop control without cooling fans, harmonic interference or load shock current.

Description

technical field [0001] The invention relates to the technical field of household radiant heat furnaces, in particular to a closed-loop control civilian infrared radiant heat electric furnace provided with a composite switch and a control method. Background technique [0002] According to human cooking methods and habits, today's household cooking stoves generally use manual control of energy power to adjust the heating power of the stove to meet the requirements for adjusting the cooking temperature. This is the habit of temperature control in cooking operations that people have been using to this day. With the improvement of social living standards, people gradually realize the importance of healthy diet and green cooking to the human living environment, especially as the detection technology for air pollution particles PM10 and PM2. And the value of PM2.5 has a greater impact. The latest technology shows that the high temperature during the cooking process will lead to t...

AI Technical Summary

Problems solved by technology

see figure 2 , there is a more fatal flaw, that is, in the thyristor voltage regulation technology, the average load voltage is controlled by changing the firing angle of the thyristor, then the load R L The voltage waveform on the above has waveform distortion, such as image 3 Thyristor Phase Shift Control Load Waveform U RL As shown, the n x 50 higher harmonics generated by distortion, where n is an odd number, and the fundamental wave is 50Hz, will pollute the power grid

And the higher harmonic content changes with the change of the trigger angle, that is, the load voltage waveform is always changing during the control process, which brings greater difficulty to harmonic filtering

The radiant furnace is a high-power household appliance, which has a great impact on the power grid. This is one of the reasons why foreign electric stove control technology abandons closed-loop control, while domestic manufacturers use thyristor voltage regulation technology for household radiant furnaces, and do not pay attention to it. Pollution to the power grid by home appliances using power electronics

[0005] The degree of distortion changes with the phase shift of the firing angle. If the harmonic pollution to the power grid is not eliminated, the harm is much greater than that of energy-saving lamps without filtering.

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