SQUIB_FIRING_CIRCUIT_Ⅰ

Published:2009/7/1 20:53:00 Author:May | From:SeekIC

Capacitor C1 is charged to + 28V through R1 and stores energy for firing the squib. A positive pulse of 1mA applied to the gate of SCR1 will cause it to conduct, discharging C1 into the squib load X1. With the load in the cathode circuit, the cathode rises immediately to +28 V as soon as the SCR is triggered on.Diode D1 decouples the gate from the gate trigger source, allowing the gate to rise in potential along with the cathode so that the negative gate-to-cathode voltage rating is not exceeded. This circuit will reset itself after test firing, since the available current through RI is less than the holding current of the SCR. After C1 has been discharged, the SCR automatically turns off-allowing C1 to recharge.



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