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DC Signals Figure 1(a) shows a simple circuit that applies a DC signal from an external trigger circuit. The switch S is closed to turn the SCR ON. Closing the switch applies a DC current to the gate of the SCR, which is forward biased by the source (Vs). Once the SCR is conducting, the switch can be opened to remove the gate signal. Diode D limits the magnitude of a negative gate signal to = 1 V, and the resistor Rg is used to limit the gate current. Figure 1(b) shows an alternative circuit that provides the gate signal internally from the main power source. The two circuits operate in essentially the same way. Applying a constant DC gate signal is not desirable because of the gate power dissipation, which would be present at all times. Also, DC gate signals are not used for triggering SCR's in AC applications, because the presence of a positive signal at the gate during the negative half-cycle would increase the reverse anode current and ssibly destroy the device. A SCR RL RG K D EG Vs

DC Signals Figure 1(a) shows a simple circuit that applies a DC signal from an external trigger circuit. The switch S is closed to turn the SCR ON. Closing the switch applies a DC current to the gate of the SCR, which is forward biased by the source (Vs). Once the SCR is conducting, the switch can be opened to remove the gate signal. Diode D limits the magnitude of a negative gate signal to = 1 V, and the resistor Rg is used to limit the gate current. Figure 1(b) shows an alternative circuit that provides the gate signal internally from the main power source. The two circuits operate in essentially the same way. Applying a constant DC gate signal is not desirable because of the gate power dissipation, which would be present at all times. Also, DC gate signals are not used for triggering SCR's in AC applications, because the presence of a positive signal at the gate during the negative half-cycle would increase the reverse anode current and ssibly destroy the device. A SCR RL RG K D EG Vs

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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DC Signals Figure 1(a) shows a simple circuit that applies a DC signal from an external trigger circuit. The switch S is closed to turn the SCR ON. Closing the switch applies a DC current to the gate of the SCR, which is forward biased by the source (Vs). Once the SCR is conducting, the switch can be opened to remove the gate signal. Diode D limits the magnitude of a negative gate signal to = 1 V, and the resistor Rg is used to limit the gate current. Figure 1(b) shows an alternative circuit that provides the gate signal internally from the main power source. The two circuits operate in essentially the same way. Applying a constant DC gate signal is not desirable because of the gate power dissipation, which would be present at all times. Also, DC gate signals are not used for triggering SCR's in AC applications, because the presence of a positive signal at the gate during the negative half-cycle would increase the reverse anode current and possibly destroy the device. SCR RL G S RG EG Vs
Transcribed Image Text:DC Signals Figure 1(a) shows a simple circuit that applies a DC signal from an external trigger circuit. The switch S is closed to turn the SCR ON. Closing the switch applies a DC current to the gate of the SCR, which is forward biased by the source (Vs). Once the SCR is conducting, the switch can be opened to remove the gate signal. Diode D limits the magnitude of a negative gate signal to = 1 V, and the resistor Rg is used to limit the gate current. Figure 1(b) shows an alternative circuit that provides the gate signal internally from the main power source. The two circuits operate in essentially the same way. Applying a constant DC gate signal is not desirable because of the gate power dissipation, which would be present at all times. Also, DC gate signals are not used for triggering SCR's in AC applications, because the presence of a positive signal at the gate during the negative half-cycle would increase the reverse anode current and possibly destroy the device. SCR RL G S RG EG Vs
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