Industrial electronics
Remember it
Never forget thyristor protection again
Never forget the five ways to protect a thyristor again.
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Lesson notes
Key points
- Silly / Snubber (dv/dt): Silly is the snubber: an RC network that limits dv/dt.
- Fuses / Fuse (overcurrent): Fuses are fast-acting semiconductor fuses that clear overcurrent faults.
- Only / Overvoltage (MOV): Only stands for overvoltage, clamped by varistors or surge suppressors.
- Get / Gate protection: Get is gate protection: resistors and diodes stopping noise and reverse gate voltage.
- Hot / Heatsink (thermal): Hot is the heatsink, keeping junction temperature below its rated maximum.
Takeaway: Silly Fuses Only Get Hot: snubber, fuse, overvoltage, gate, heatsink.
Quick check: Which protection limits the rate of current rise, di/dt, in an SCR?
- A parallel capacitor
- A series inductor
- A larger heatsink
A series inductor opposes rapid current change, limiting di/dt.
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