5) The figure below illustrates a simple voltage threshold detection circuit. To understand how it operates, we will analyze its behavior based on the simple constant voltage drop model for both diodes. Assume the Zener diode (Z1) only conducts when its breakdown voltage of 10V is reached. Di is a red light emitting diode (LED). Assume it conducts after its forward bias voltage of 1.8V is reached. Vin is unknown. Assume Zj acts as a perfect Zener diode (without series resistance). What voltage does Vin have to reach before there is a current through R¡? What voltage must Vin reach before current flows through R2? Write an equation for the current through Zi in terms of Vin, Rị and R2 that is valid when Vin is high enough for both diodes to be conducting. a. b. c. R2 Vino R1 LED
5) The figure below illustrates a simple voltage threshold detection circuit. To understand how it operates, we will analyze its behavior based on the simple constant voltage drop model for both diodes. Assume the Zener diode (Z1) only conducts when its breakdown voltage of 10V is reached. Di is a red light emitting diode (LED). Assume it conducts after its forward bias voltage of 1.8V is reached. Vin is unknown. Assume Zj acts as a perfect Zener diode (without series resistance). What voltage does Vin have to reach before there is a current through R¡? What voltage must Vin reach before current flows through R2? Write an equation for the current through Zi in terms of Vin, Rị and R2 that is valid when Vin is high enough for both diodes to be conducting. a. b. c. R2 Vino R1 LED
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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Transcribed Image Text:5) The figure below illustrates a simple voltage threshold detection circuit. To understand how it
operates, we will analyze its behavior based on the simple constant voltage drop model for both
diodes. Assume the Zener diode (Z1) only conducts when its breakdown voltage of 10V is reached.
Di is a red light emitting diode (LED). Assume it conducts after its forward bias voltage of 1.8V is
reached. Vin is unknown.
Assume Zj acts as a perfect Zener diode (without series resistance). What voltage does Vin
have to reach before there is a current through R¡?
What voltage must Vin reach before current flows through R2?
Write an equation for the current through Zi in terms of Vin, Rị and R2 that is valid when
Vin is high enough for both diodes to be conducting.
a.
b.
c.
R2
Vino
R1
LED
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