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Electric oven solution
Electric ovens are one of the most popular kitchen appliances in the market today. Especially in the past two years, economical and practical electric ovens have been the fastest-selling products in home appliance stores, supermarket retail, and gift and gift markets. The electric oven also plays a very important role in daily life. The intelligent electric oven can realize the automatic control of the oven, and can monitor the working status of the electric oven in real time. When an unexpected situation occurs during the operation of the oven, the system can carry out intelligent alarms and other intelligent functions. control.
Smart home appliances are an important direction for the development of home appliances at present, and play an important role in improving the intelligence level of home appliances and the practical application of home appliances. Smart home appliances can meet the diverse requirements of the current society for home appliances. This article will discuss the design scheme of the smart electric oven and the working principle of related circuits, and make a detailed analysis and discussion of the key technologies and important content, which has important reference significance for the research and development of other smart home appliances.
1. The working principle of the electric oven
The smart electric oven is composed of functional modules such as a stable power supply circuit, a single-chip microcomputer control operation circuit, a display drive circuit, and an intelligent alarm circuit. At the same time, the working state can also be preset according to the needs of the work. The power supply adopts a traditional series-type regulated power supply module, which can output 6-12V DC voltage according to the demand. The single-chip microcomputer control circuit takes into account the requirements of large-scale industrial production and work performance, and uses a single-chip microcomputer for control. After testing and analysis, it can complete the competent The work of the product adopts VFD display technology in the display part to meet the display requirements of home appliances such as clear display, high visibility, and rich display content. The design of the overall circuit follows a modular design scheme, conforms to the current development trend of smart home appliances, and meets all the actual needs in the application process of smart electric ovens.
2. Key points of smart electric oven design
According to the actual user demand survey, combined with the characteristics of the current smart electric oven on the market, the working performance indicators of the smart electric oven are formulated, which are mainly divided into the following aspects. In order to have better adaptability, the product design has a power supply range of 3-24V; the control circuit must have a strong actual driving capability, its output impedance is not greater than 10 kΩ, and the output driving current is not less than 20mA; the product It is necessary to be able to achieve accurate timing, work continuously for two days, and its system control time error is less than 3 seconds; the product has a good human interface to facilitate control; the product must have portability and room for performance improvement.
3. Technical solution of smart electric oven
The intelligent electric oven control board designed based on single-chip microcomputer is composed of six functional parts, including power supply circuit, single-chip microcomputer signal processing, display unit, output relay control circuit, working state setting, and working state alarm circuit. In the circuit design, the modular design scheme is followed, and the functions of each circuit are relatively independent. The corresponding scheme is adopted in the connection of the circuit, and the coupling between the module circuits is minimized.
There are many implementation schemes for the power supply circuit. At present, switching power supply and series regulated power supply are commonly used. Since the power supply of each chip in the design has a wide operating range, the requirements for the stability and ripple coefficient of the power supply are not very high. From From the perspective of cost, a series-type regulated power supply with simple structure and good performance is adopted in the design. The circuit adopts the classic working ideas of voltage transformation, rectification, filtering and voltage stabilization, and two grounding capacitors are added to the output, which effectively reduces the harmonic components of the output signal and improves the stability of the power supply; the signal conditioning circuit adopts The amplifying circuit based on the operational amplifier is adopted, the core of which is a proportional operational amplifier circuit, which adopts three-stage amplification, which can ensure the detection and processing of small signals; the single-chip microcomputer is cost-effective, and it is also often used in the control of household appliances. The model, its real-time performance and control ability are suitable for the requirements of home appliance control; the VFD display requires a higher current, so a drive scheme based on triode is adopted to ensure the brightness and other effects of the VFD display; the alarm module adopts a DC buzzer Realization, at the same time the circuit has the control of multiple relays, and has a strong external control function.
4. Design and program development of electric oven circuit board
On the basis of the circuit schematic diagram, auxiliary software can be used for the design of the electronic circuit board (PCB) and the development of the single-chip microcomputer control program. This product adopts the overall design scheme of manual layout components and automatic wiring. In the design and development process, the mechanical characteristics of the product are first considered comprehensively, and then the core control devices in the product are laid out, such as single-chip microcomputers, etc.; finally, the layout of other general components is carried out. The demand for structured wiring is fulfilled, the overall layout of the circuit is beautiful and usable, the wiring is stable and reliable, and the overall product performance is good. In the writing of the control program, the assembly instruction set with good real-time performance and small storage space requirement is adopted, and a large number of example programs are used in the program, which enhances the readability of the program and the module design idea of the program.
5. The key points of electric oven scheme design
Throughout the mainstream electric oven products sold in the market, all companies believe that the difficulty of electric oven technology is mainly in precise temperature control, and the key point of the production process is the process of the shell. The selection of spare parts is also a key factor in determining the durability of an electric oven.
1. The molding process of the electric oven
The shell of the electric oven is generally made of cold-rolled plate and stainless steel. The process of these two materials is mainly metal forming processes such as stretching, curling, extrusion, and punching. After forming, the surface also needs to be sprayed, oil sprayed and other anti-rust treatment and surface beautification treatment. The forming process of cold-rolled sheet and stainless steel is relatively difficult, and it is prone to breakage and wrinkling during the process of stretching the flat sheet into a three-dimensional shell.
2. Precise temperature control technology of electric oven
Accurate temperature control has been the main direction of electric oven companies for many years. Temperature control has always been a difficult point for electric oven manufacturers. The national standard allows ±30°C for the temperature deviation in the electric oven box. The precise temperature control of the electric oven is mainly determined by the temperature sensing method and the position of the temperature measurement. One of the data is very important, that is, the temperature compensation value. There is a difference between the actual temperature in the electric oven and the temperature felt by the temperature sensor. In general, if the actual temperature is higher than the temperature value felt by the temperature sensor, it is necessary to add a compensation value to the temperature sensor to control the temperature accurately. The compensation value of the temperature sensor is obtained through multiple tests, and the value obtained in each test is different, so the compensation value is an average value calculated after multiple tests. The more trials, the more accurate the compensation value will be.
Another factor that affects precise temperature control is the placement of the temperature sensor. Under normal circumstances, the temperature sensor is placed on the right side of the electric oven, and is linked with the controller through the sensor. There are three ways for the temperature sensor to sense temperature, one is to use the temperature sensing bracket to measure the temperature; the other is to use the probe to measure the temperature; the other is to use the temperature sensor to measure the temperature of the air, which is the most accurate way .
3. The temperature resistance of electric oven selection
In addition, since the electric oven is a high-temperature heating electrical product, the temperature resistance of the material is also very important. The quality of the material directly affects the quality of the product and the user's use effect. Among the materials used in electric ovens, the temperature resistance of plastic parts and door glass is the most critical. Under normal circumstances, the knobs and handles of electric ovens are all plastic products, and the materials used must be PBT, PF, nylon and other materials with a temperature resistance above 200°C. In order to save costs, some enterprises dope the raw materials with other substances, which will cause the frequently used parts such as knobs to quickly age and be damaged. In addition, the box of the electric oven control panel should also use temperature-resistant plastic materials, otherwise it will be easily deformed under high temperature. The glass door of the electric oven is directly in contact with the high temperature in the cavity, so it is necessary to use tempered glass with a temperature resistance above 300°C, otherwise it is easy to burst and hurt people. The door glass of the electric oven is made of toughened mirror glass. The glass door and the grilling net adopt a linkage mechanism. The glass door and the micro power switch are organically combined to make it safer to use. hurt consumers.
With the ever-changing needs of consumers, microcomputer electric ovens with convenient operation and precise temperature control are more and more favored by consumers, and have gradually become a breakthrough for electric ovens. This product has an exquisite appearance, cancels the knobs for temperature control and time control, and uses touch and liquid crystal display. In terms of technical requirements, liquid crystal displays are also very sensitive to temperature. At high temperatures, liquid crystal displays are prone to garbled characters. Therefore, the intelligent electric oven also needs to deal with the temperature resistance of the liquid crystal display.
The above are the details of the electric oven solution introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. for you. If you have electronic function development needs for electric ovens and electric ovens, you can trust us. We have rich experience in customized development of electronic products. We can evaluate the development cycle and IC price as soon as possible, and can also calculate PCBA quotations. We are a number of chip agents at home and abroad, including MCU, voice IC, Bluetooth IC and modules, wifi modules. Our development capabilities cover PCB design, single-chip microcomputer development, software custom development, APP custom development, WeChat official account development and other hardware and software design. It can also undertake the research and development of smart electronic products, household appliances scheme design, beauty equipment development, Internet of Things application development, smart home scheme design, TWS scheme development, Bluetooth audio development, children's toy scheme development, and electronic education product development.
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