Low Voltage Smart Kettle Power Design Guide
🔌 The Problem: Powering Low-Voltage Smart Kettles Safely
Smart kettles used in automation and IoT kitchens need low-voltage electronics to control sensors, displays, and Wi-Fi modules. The challenge? Converting high mains voltage (230V AC) into a safe low-voltage DC (like 5V or 12V) supply efficiently, safely, and in a compact form.
🛠️ The Solution: Use SMPS and Thermal Protection
A compact Switch Mode Power Supply (SMPS) module is perfect for stepping down 230V AC to 5V or 12V DC efficiently. Combine it with a MOSFET for power switching and a NTC thermistor or PTC fuse to handle surge and thermal protection.
🧪 Practical Example :
Let’s say your smart kettle control board needs 5V @ 500mA for Wi-Fi and relays. Instead of using a bulky linear regulator (which would waste power as heat), you can use a 5V 1A SMPS module with built-in safety features, powering the system more efficiently.
🔢 Sample Calculation :
To choose the right power supply:
Power = Voltage × Current = 5V × 0.5A = 2.5W
Add 20% safety margin → 2.5W × 1.2 = 3W minimum SMPS required.
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