Reverse Current Protection in LED Lighting
🔄 The Problem: Reverse Current in Lighting Circuits
Reverse current happens when power flows backward through your LED or lighting driver circuit—especially in multi-supply or backup battery scenarios. This can damage components, cause flickering, or reduce lifespan.
✅ The Solution: Add Reverse Current Protection
The simplest fix? Use a Schottky diode or a P-channel MOSFET to block reverse current. These components allow current to flow only in the intended direction and protect sensitive circuits.
Schottky Diode = low forward voltage drop, simple to use
P-Channel MOSFET = more efficient for high currents with less power loss
💡 Practical Example: LED Street Light with Solar Backup
In a solar-powered LED streetlight, when AC fails, the battery takes over. Without protection, current could flow back into the AC driver—causing damage. A P-MOSFET reverse protection circuit ensures the battery only powers the LEDs, not the driver.
🧮 Sample Calculation: Diode Power Loss
If current = 1A and Schottky forward drop = 0.3V,
Power loss = P = V × I = 0.3V × 1A = 0.3W.
Over time, this adds heat—so choose a low-drop device.
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