Industrial electronics
DM thread
Why the SCR Stays On After the Gate Lets Go
I removed the gate signal and my SCR lamp stayed on. Broken?
Quick check · tap an answer to continue
Lesson notes
Explain how an SCR latches on via gate pulse and why it only turns off when current falls below holding
Takeaway: The gate turns an SCR on; only low current turns it off.
Quick check: What must happen for a conducting SCR to turn off?
- Gate signal is removed
- Current falls below holding
- Gate gets a larger pulse
The regenerative loop only breaks when anode current drops below holding current.
latching currentholding currentforward breakover voltage
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