🛠️ The Problem :

An SMPS (Switched-Mode Power Supply) is the heart of most modern electronic devices. But if the input voltage suddenly spikes—due to grid fluctuations or faulty adapters—it can damage your entire circuit. Overvoltage at the input can fry components, damage the SMPS controller, and even pose fire hazards.

✅ The Solution :

The fix? Add input overvoltage protection using MOVs (Metal Oxide Varistors) or TVS (Transient Voltage Suppression) diodes. These components clamp high voltage surges, protecting downstream electronics.

💡 Practical Example :

Imagine powering your microcontroller project from a wall adapter. One day, a voltage spike hits—your SMPS fails, and the board gets damaged. Adding a 275V MOV at the input prevents such spikes from reaching sensitive components.

📐 Sample Calculation :

Suppose your input is 230V AC.

A suitable MOV should start clamping slightly above peak voltage:

230V RMS × √2 ≈ 325V peak

Choose an MOV rated ~275V RMS with a clamping voltage of ~350–400V.

🛒 Product Suggestion :

Use MOVs and TVS diodes—tested for Indian conditions and Made in India for reliability.

🔗 MOV

🔗 TVS diode

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