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The disinfection cabinet control board serves as the core safety management unit, and its protection mechanism directly determines the safe operation of the whole machine. A complete safety system includes hardware protection, software logic control, sensor monitoring, and interlock mechanisms to prevent risks such as electric leakage, over-temperature, dry burning, door opening during operation, overload, and short circuit.
1. Over-Temperature Protection
The control board monitors real-time temperature through NTC or temperature sensors.
When the temperature exceeds the safe threshold, the system immediately cuts off the heating load.
An alarm is triggered simultaneously to prevent overheating, fire, or cabinet deformation.
Independent over-temperature fuse is used as a secondary hardware backup.
2. Anti-Dry Burning Protection
In case of abnormal heating or sensor failure, the control board identifies a sharp temperature rise.
Quickly disconnects the heating tube drive signal.
Prevents heater burnout, line damage, and fire hazards.
Works with dual temperature detection to avoid failure caused by a single sensor fault.
3. Door Interlock Protection
To avoid ozone leakage, high-temperature scalding, or ultraviolet radiation:
The control board detects the door switch signal in real time.
If the door is opened during disinfection or high-temperature drying, the load is stopped immediately.
Operation resumes only after the door is closed, ensuring user safety.
4. Leakage Protection
The control board integrates or cooperates with a leakage detection module:
Monitors insulation performance and current anomalies.
Cuts off the main power supply once leakage is detected.
Effectively prevents electric shock in high-humidity environments.
5. Overcurrent and Short Circuit Protection
Fuses and current-sampling circuits protect the power supply and loads.
When a short circuit or overload occurs, the output is locked instantly.
Prevents burnout of the control board, relays, heaters, fans, and ozone generators.
6. Overvoltage and Undervoltage Protection
The control board detects input voltage in real time.
Stops operation when voltage is too high or too low.
Avoids component breakdown or abnormal heating caused by unstable power supply.
Improves adaptability to unstable grid environments.
7. Surge and Lightning Protection
Varistors and discharge tubes are arranged at the power input.
Absorb instantaneous high-voltage pulses.
Protect the MCU and drive circuits from breakdown.
Enhance anti-interference and stability in complex environments.
8. Motor and Fan Protection
For circulating fans and motor-driven structures:
The control board detects locked-rotor and abnormal current.
Stops power supply in time to prevent coil burnout.
Ensures normal airflow and temperature uniformity.
9. Software Self-Protection and Fault Diagnosis
Built-in watchdog automatically resets when the program is abnormal.
Fault codes display for sensor open/short circuit, over-temperature, and load faults.
Software delay and anti-shake design avoid misoperation.
10. Summary
The safety protection mechanism of the disinfection cabinet control board forms a multi-dimensional system covering temperature, electricity, machinery, and software. Through hardware redundancy, real-time monitoring, interlock control, and fault self-diagnosis, the control board effectively avoids various risks and ensures safe and reliable operation throughout the product life cycle.