Posted on Jun 29, 2012

Snubber circuit R2C2, as shown, might be necessary since Rl and Cl are tailored for optimized triggering and not for dV!dt protection. Fiber-optic pairs can be used with discrete SCRs to switch thousands of volts. A photon coupler with a transistor output will limit the trigger-pulse amplitude and rise time because of CTR and saturation effects.

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Using the HllCl, the rise time of the input pulse to the photon coupler is not critical, and its amplitude is limited only by lite HllCl turn-on sensitivity. The load can also be connected to the cathode as illustrated in Fig. 67-3B.

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