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The control board is the core of the disinfection cabinet, and its safety control system directly determines user safety and equipment stability. Aiming at risks like electric shock, overheating, ozone leakage, and mechanical damage, this paper briefly expounds the key design of the safety control system.
1. Core Design Principles
Standard Compliance: Adhere to IEC 60335, GB 4706 and other standards, covering insulation, leakage current, overvoltage/overcurrent limits, and ozone/high-temperature safety requirements.
Dual Protection: Key links adopt hardware-software dual protection to avoid single-point failures.
Rapid Response: Detect abnormalities in milliseconds and trigger power-off/alarm immediately.
User-Friendly Safety: Equip with child lock, door interlock, and fault prompts to prevent misoperation.
2. Key Protection Modules
2.1 Power Supply Protection
Overvoltage/undervoltage protection: Cut off load power when input voltage exceeds 180V-240V (for 220V systems) and alarm.
Overcurrent/short circuit protection: Current sensor monitors loads; cut off power within 10ms when overloaded/short-circuited, and lock startup.
Leakage protection: Cut off live/neutral wires immediately if leakage current exceeds ≤0.75mA, and alarm.
2.2 Temperature Protection
Multi-point detection: NTC sensors monitor heating chamber, heating tube, and control board (accuracy ±1℃).
Over-temperature shutdown: Cut off heating power if chamber temp >125℃ (high-temperature type) or control board temp >85℃, and alarm.
Uniform heating: PWM adjusts heating tube power to avoid local overheating.
2.3 Ozone Leakage Protection (for ozone type)
Ozone sensor detects concentration; stop generator and start decomposition when exceeding ≤0.2mg/m³. Activate door interlock—door can only open after ozone decomposition.
2.4 Door Interlock & Anti-Misoperation
Door switch sensor triggers power-off of heating tube/ozone generator when door opens during operation. Child lock locks buttons except power-off to prevent misoperation by children.
3. Fault Diagnosis & Alarm
Detect overvoltage (E1), overheating (E2), ozone leakage (E3), sensor failure, etc. Adopt sound-light alarm with fault codes for easy troubleshooting. Serious faults lock startup; general faults recover automatically after elimination.
4. Reliability Optimization
Component selection: Use high-insulation relays, overcurrent fuses, and high-temperature resistant parts.
Anti-interference: Add EMI filters and surge protectors to avoid false alarms.
Waterproof & moisture-proof: Coating with moisture-proof paint and sealing terminals to adapt to high-humidity environments.
5. Conclusion
The safety control system integrates power, temperature, ozone, and human-machine safety protection. Through standard compliance, dual protection, rapid response, and reliable design, it effectively avoids safety accidents, ensuring safe use and user experience.