⚠️ The Problem :

In Power over Ethernet (PoE) systems, devices share power and data over the same cable. But when two PoE sources or backup supplies are involved, reverse current flow can damage internal circuits or power controllers. This is a common issue in redundant or daisy-chained setups.

✅ The Solution :

The fix is simple: use MOSFET-based reverse current protection. Unlike diodes, MOSFETs offer ultra-low voltage drop, reducing heat and maintaining efficiency. You can also use ideal diode controllers with external MOSFETs for smarter protection.

🧰 Practical Example :

Imagine you’re powering a Raspberry Pi-based network camera via PoE, with a battery backup. If the main supply cuts out, the battery might backfeed power into the PoE line. This could damage the Ethernet switch. A reverse current protection MOSFET blocks this and keeps both sides safe.

📐 Sample Calculation :

If load current is 1A and MOSFET Rds(on) = 30mΩ:

Power loss = I² × R = 1² × 0.03 = 30mW,

far better than a diode drop of 0.7V × 1A = 700mW.

🛒 Product Recommendation :

Choose Made in India for reliable PoE protection:

• Power MOSFETs

• [Ideal Diode Controllers]

🛍️ Shop now at SmartXProKits.in
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