The Design Of A Barbecue-inverter Microwave Oven

The development of microwave oven can be traced back to 60 years ago. The design and manufacturing technology of microwave oven now is very mature.However,due to people' s increasing demand on the intelligence and security of home appliances and the purchasing of sustainable development,more and more aspects must be taken into account when designing the household appliances.Modern kitchen microwave oven,as an indispensable cooking appliance,needs a higher design requirements too.The article presents one realization program of a barbecue-inverter microwave ovens and explains how to produce the finished product.System design focus on arrange the reasonable position of the all components. At the same time,a set of safety measures is applied to the structure of the oven and electronic control to ensure the reliability and prevent the harm of microwave to human health.In the explanation of its structure design,this article presents the size calculation method of the main microwave components and thus determines the size of waveguide and cavity.In the circuit design,it adopts a zero off the soft-switch technology to avoid the sudden strong currents cutting-off resulted from the relay switch break-off.In this way,it also greatly reduces the EMI signal of the product.In order to ensure safe use under any circumstances,it applies the dual-drive relay technology,which can guarantee zero microwave output at unusual circumstances.To create a better user interface,it uses a buzzer sound attenuation control to produce soft and sweet sound.Rotary encoder is used for microwave power setting to perfect performance.In software design,fully considering the relationship between the time and space,it makes reasonable procedures for planning and rationally uses MCU resources torun a very stable and reliable program.A single command is used for WDT counter clear.Tests are repeated many times for signal detection to reject interference.Functional integrity and small relevance of subroutine design make all function more flexible.Ingenious designs are also applied to short or long key press,voice control,PWM control signal,display,keys signal detection,etc.Finally,the article shows the test results on the whole performance, safety,electromagnetic compatibility,and other indicators according to internationally accepted standards.The test results are in line with the requirements of the test.