The Problem: Powering a Smart Kettle on Low Voltage

Designing a smart kettle that runs on low voltage (e.g., 12V or 24V DC) can be tricky. Heating elements typically need high power, and integrating control electronics like sensors, Wi-Fi modules, and microcontrollers demands efficient power management. Without proper power design, your kettle may heat too slowly or overload the electronics.

The Solution: Efficient Dual-Stage Power System

Use a dual power path approach:

• High-current MOSFETs to control the heating coil.

• A DC-DC converter (buck module) to step down voltage for the microcontroller and smart functions (usually 3.3V or 5V).

Always isolate high-current and low-voltage sections for safety and performance.

Practical Example :

Say your heating coil draws 5A at 12V → 60W total. Your microcontroller (ESP32) might only need 3.3V at 500mA (1.65W). Use a step-down converter with good thermal handling, and a MOSFET rated 10A or higher for switching the coil.

Sample Calculation :

Power needed for MCU = V × I = 3.3V × 0.5A = 1.65W

If converter efficiency = 85%, Input Power ≈ 1.94W

Product Suggestion :

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