W09 EECS 314 HW02 Extra Credit Solution

# W09 EECS 314 HW02 Extra Credit Solution - EECS 314 Winter...

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EECS 314 Winter 2009 Homework set 2 HW problem for extra credit Wheatstone bridge circuit for temperature control, with PTC and NTC sensors SAMPLE SOLUTION © 2009 Alexander Ganago page 1 of 10 January 18, 2009 This problem contains 3 parts, independent of each other. You can do any part(s) you wish and skip the other(s). The solution is due January 27, 2009. Consider the following circuits for temperature control, each of which includes a Wheatstone bridge, a comparator, and a MOSFET: Two types of sensors can be used as R T : a thermistor with Negative Temperature Coefficient (NTC) and a Temperature-Dependent Resistor (TDR) with Positive Temperature Coefficient (PTC). Part 1 (20 points) For each of type of sensor, explain which circuits (diagrams 1 – 4) can be used if the actuator is a heater, which has to be automatically turned on if temperature gets too low. Write your answers in the table:

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EECS 314 Winter 2009 Homework set 2 HW problem for extra credit Wheatstone bridge circuit for temperature control, with PTC and NTC sensors SAMPLE SOLUTION © 2009 Alexander Ganago page 2 of 10 January 18, 2009 The circuit can turn on the heater Circuit diagram # Thermistor circuit TDR circuit Comment, if needed 1 Yes / No Yes / No 2 Yes / No Yes / No 3 Yes / No Yes / No 4 Yes / No Yes / No See sample solution on the following pages
EECS 314 Winter 2009 Homework set 2 HW problem for extra credit Wheatstone bridge circuit for temperature control, with PTC and NTC sensors SAMPLE SOLUTION © 2009 Alexander Ganago page 3 of 10 January 18, 2009 Solution for Part 1 Let us proceed with the circuit analysis for each diagram, doing it twice – for a TDR with PTC and for a thermistor with NTC. In the Wheatstone bridge circuit shown on

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W09 EECS 314 HW02 Extra Credit Solution - EECS 314 Winter...

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