The process of the electric pressure cooker LCD industrial control circuit board converting cooking data into screen display signals is a continuous chain of "data acquisition - signal processing - format conversion - drive display", and each link depends on the coordination of hardware components and program logic. This process must ensure that the data is accurately mapped to the screen display content and the response speed must be guaranteed to adapt to the changes in the real-time cooking status.
The first is the collection and preliminary processing of cooking data. The core sensors of the electric pressure cooker (such as pressure sensors, temperature sensors, and timers) will convert the real-time cooking status into electrical signals - the pressure sensor outputs an analog voltage corresponding to the pressure in the pot, the temperature sensor feedbacks the temperature through resistance changes, and the timer records the time with a pulse signal. These signals first enter the signal conditioning circuit of the industrial control circuit board, and after filtering (removing the electromagnetic noise generated by the motor operation) and amplification (raising the weak signal to the recognizable range), they are converted into stable analog quantities, laying the foundation for subsequent processing.
The next step is the conversion of analog signals to digital signals. The ADC (analog-to-digital converter) on the industrial control circuit board is responsible for this link. It samples the conditioned analog signal at a fixed frequency (usually 10-20 times per second) and converts physical quantities such as voltage and resistance into binary digital signals. For example, the resistance change of the temperature sensor will be converted into a digital code representing a specific temperature value (such as "00110101" corresponds to 50°C). The accuracy of the ADC (usually 12 bits) determines the fineness of the data, ensuring that there will be no obvious jumps when displaying parameters such as temperature and pressure.
After the digital signal enters the main control chip, it will undergo logical operations and data integration. The control chip analyzes the digital signal according to the preset program - for example, comparing the pressure value with the standard value of the preset cooking mode (such as "cooking rice" and "making soup") to determine whether the current state meets the standard; associating temperature, time and other data according to the cooking stage to generate displayable information such as "15 minutes remaining, current temperature 110°C". At the same time, the chip will process user operation instructions (such as pressing the "keep warm" button), merge it with the sensor data, update the content to be displayed, and ensure that the screen information is consistent with the actual operating status.
Then comes the format conversion of the display signal. The electric pressure cooker LCD requires a specific format of drive signal (such as dot matrix scanning signal, row and column drive signal) to display characters or graphics, and the control chip will convert the integrated digital information into this format. For example, to display "20 minutes", the chip needs to call the dot matrix data of "2", "0", "minutes" and "hours" in the font library, arrange them into a pixel matrix according to the screen resolution, and then convert them into timing signals that the electric pressure cooker LCD can recognize, including line synchronization signals, field synchronization signals and data enable signals, to ensure that the position and clarity of the characters on the screen meet the design requirements.
The signal transmission link depends on the stable operation of the interface circuit. The industrial control circuit board is connected to the electric pressure cooker LCD through a cable, and the interface circuit is responsible for level conversion of the converted display signal. Since the signal level (usually 3.3V) output by the control chip may be different from the electric pressure cooker LCD driving voltage, the level conversion chip at the interface will adjust the signal to the matching range and enhance the signal strength to offset the attenuation during transmission. Some circuit boards will also add anti-interference capacitors at the interface to reduce the electromagnetic noise introduced during cable transmission and avoid display noise or dislocation.
The electric pressure cooker LCD driving circuit is the last link from signal to display. After receiving the format-converted signal, the driver chip on the industrial control circuit board will generate a voltage signal to drive the electric pressure cooker LCD pixel point. For the segment code screen, the driver chip lights up the corresponding field by controlling the high and low levels of specific pins; for the dot matrix screen, the driving voltage is applied in sequence according to the row and column addresses of the pixel matrix through line-by-line scanning, so that the liquid crystal molecules at the corresponding position change their arrangement state and show light and dark differences. The refresh rate of the drive circuit (usually above 60Hz) determines the smoothness of the display and avoids flickering.
The real-time performance of the entire process is guaranteed by program scheduling. The control program of the industrial control circuit board will process the tasks of each link according to priority: sensor data acquisition and display signal output are set to high priority to ensure that data update and screen refresh are completed every 100 milliseconds; while character conversion, format processing, etc. are performed during idle time to avoid occupying core resources. This scheduling method allows the screen display content to reflect the state changes in the pot in a timely manner. For example, when the user adjusts the pressure setting, the screen can update the corresponding value within 1 second to achieve visual monitoring of the cooking process.
From the entire process of sensor acquisition to screen lighting, the industrial control circuit board converts abstract cooking data into intuitive display information through the signal processing capability of the hardware circuit and the logical scheduling capability of the software program, which not only ensures the accuracy of the data, but also realizes real-time response, becoming the core link of human-computer interaction of the electric pressure cooker.
