transistor conducts more more rapidly [25]. The capacitor voltage controls the l

Question

transistor conducts more more rapidly [25]. The capacitor voltage controls the lamp voltage directly. A block diagram of the system is shown in Figure E2.7. Find the closed-loop transfer function, I(s)/R(s) where I(s) is the lamp intensity, and R(s) is the command or desired level of light. A lamp's intensity stays constant when monitored by an optotransistor-controlled feedback loop. When the voltage drops, the lamp's output also drops, and optotransistor draws less current. As a result, a power transistor conducts more heavily and charges a capacitor more rapidly. The capacitor voltage controls the lamp voltage directly. A flow diagram of the system is shown in Fig. E2.7 in the text. Find the closed-loop transfer function I(S) R(S) where I(S) is the lamp intensity, and R(S) is the command or desired level of light. A) B) C) D)

Explanation / Answer

b

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