The disinfection cabinet main control board is the “brain” of the whole machine, responsible for operating logic control, disinfection mode scheduling, temperature monitoring, door interlock protection, timing management and human-computer interaction. A stable and complete function design and rigorous program logic are the core to ensure safe, efficient and automatic operation of disinfection, drying and storage functions. Combined with the working characteristics of high humidity, ozone and high temperature inside the disinfection cabinet, this article focuses on the core function module design and complete program operation logic of the main control board.

1. Core Function Design of Disinfection Cabinet Main Control Board

The main control board integrates 8 key functions to meet daily disinfection, drying, storage and safety requirements:

(1) Multi-mode Disinfection Control
Support ultraviolet disinfection, ozone disinfection, high-temperature disinfection, combined disinfection (UV + ozone), drying mode, storage mode and quick disinfection mode. The main control board automatically matches the working time, power and operation sequence according to different modes to ensure disinfection effect and energy saving.

(2) Automatic Timing and Countdown Control
Built-in high-precision timing system, support 10–120 minutes adjustable disinfection time, automatic countdown during operation, automatically stop working when time is up, and send out prompt tone.

(3) Door Interlock Safety Protection
Real-time detection of cabinet door status. If the door is opened during disinfection or heating, the system immediately cuts off UV, ozone and heating loads to prevent ultraviolet radiation, ozone leakage and high-temperature scalding. The machine can only run when the door is closed.

(4) Temperature Monitoring and Over-temperature Protection
For high-temperature disinfection models, real-time acquisition of internal temperature through NTC thermistor. Automatic constant temperature at 100–125℃. When temperature exceeds limit, the system forcibly cuts off heating to avoid over-temperature damage or safety risks.

(5) Automatic Drying and Dehumidification
After disinfection, automatically start drying function, control heating tube and fan to run, remove internal moisture, keep tableware dry and prevent bacteria regeneration.

(6) Human-computer Interaction and Status Display
Identify key / touch signals, display working mode, remaining time, fault code; with buzzer prompt for key operation, completion and fault alarm.

(7) Fault Self-diagnosis Function
Automatically detect sensor short / open circuit, load abnormality, over-temperature, door open fault, display fault code and lock dangerous output.

(8) Automatic Energy-saving Storage
Regular micro disinfection or dehumidification in storage mode to keep long-term clean and dry without manual operation.

2. Overall Program Logic Architecture

The program of disinfection cabinet main control board adopts cycle polling + interrupt priority structure, divided into 4 parts:

(1) Power-on Initialization
Configure IO port, AD sampling, timer, display drive, watchdog, reset all parameters, and set the system to standby state.

(2) System Self-check
After power-on, automatically detect temperature sensor, door switch, display circuit, drive circuit. If abnormal, display fault code and prohibit startup.

(3) Main Cycle Polling
Scan keys → detect door status → collect temperature → run mode logic → drive load → refresh display → judge timing → process fault.

(4) High-priority Interrupt Response
Including door open interrupt, over-temperature interrupt, timing interrupt, to ensure immediate response to safety events.

3. Complete Working Program Logic

Step 1: Standby State
The system is in low power consumption, real-time scanning key and door status, waiting for user operation.

Step 2: Receive User Instruction
User selects disinfection mode and time, presses start key. The system first detects cabinet door: if open → forbid startup + alarm; if closed → enter operation preparation.

Step 3: Formal Startup Operation
According to the selected mode, the main control board outputs control signal:
- UV / ozone disinfection: turn on UV lamp and ozone generator;
- High-temperature disinfection: turn on heating tube, monitor temperature constant temperature;
- Drying: turn on heating + fan for dehumidification;
- Timing starts countdown at the same time.

Step 4: Real-time Monitoring During Operation
- Door is opened: immediately stop all output, enter protection state;
- Temperature overrun: forced power off, alarm;
- Sensor fault: lock load, display fault code.

Step 5: End of Timing
Automatically cut off all loads, part of models automatically enter drying procedure. After full completion, buzzer prompts, and returns to standby state.

4. Safety Protection Program Logic (Highest Priority)

Door open protection: immediately shut down UV, ozone, heat
Over-temperature protection: cut off heating tube, start fan cooling
Sensor fault: disable disinfection and heating
Watchdog: program crash automatically reset
Over-current / short circuit: hardware fuse + software lock

5. Mode Switching Logic

Only allow mode switching in standby state; operation mode cannot be switched to avoid program confusion. If you need to change mode, you must press stop first, then reselect.

6. Summary

The disinfection cabinet main control board takes safety interlock and timing control as the core, and realizes full-automatic operation of disinfection, drying and storage through stable program logic. The design focuses on safety, reliability and anti-interference, which can adapt to humid, ozone and high-temperature environment for a long time. Clear function design and standardized program logic are the key to ensure the disinfection effect, service life and use safety of disinfection cabinet.