Velleman SCR100 Uživatelský manuál stáhnout pdf (Strana 8)

Atlas SCR User Guide January 2008 – Rev 3

Page 8

Notes on SCRs and Triacs

Silicon Controlled Rectifiers

SCR Turn-On

SCRs (Thyristors) act as a controlled diode. They block reverse current at all

times, and they conduct in the forward direction only when triggered by a pulse

of current to the control (gate) terminal. Once triggered, the SCR will continue

to conduct current in the forward direction until the device is turned off.

SCR Turn-Off

In order to turn off a triggered SCR, it is necessary to reduce the main terminal

current below the holding current for typically 5-200µS. Shorter periods may

leave insufficient time for free charge carriers to recombine, and thus when

main current is reapplied, the device may remain triggered.

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Velleman SCR100 Uživatelský manuál Strana 8