Chapter 3 problems: Difference between revisions

From Class Wiki
Jump to navigation Jump to search
Line 20: Line 20:
:*<math>I=0</math> and <math>V=7.5</math>. D1, D2, D3 pass.
:*<math>I=0</math> and <math>V=7.5</math>. D1, D2, D3 pass.


Check each guess please. More importantly, check the wrong assumptions.


'''Part B''' Need help on this one.
'''Part B''' Need help on this one.
*<math>V_{in}=0</math>, <math>V=-5</math>: D1, D4 on. D2, D3 off.
*<math>V_{in}=0</math>, <math>V=0</math>: D1, D2, D3, D4 on.
*<math>V_{in}=2</math>, <math>V=-5</math>: D1, D4 on. D2, D3 off.
*<math>V_{in}=2</math>, <math>V=0</math>: D1, D2, D3, D4 on.
*<math>V_{in}=6</math>, <math>V=5</math>: D2, D3 on. D1, D4 off.
*<math>V_{in}=6</math>, <math>V=5</math>: D2, D3 on. D1, D4 off.
*<math>V_{in}=10</math>, <math>V=5</math>: D2, D3 on. D1, D4 off.
*<math>V_{in}=10</math>, <math>V=5</math>: D2, D3 on. D1, D4 off.

V=0. D1, D4 on. Can you really sink current into a voltage source? I don't see how you will ever have negative voltage across the diodes.


===3.32===
===3.32===

Revision as of 13:58, 2 March 2010

3.9

Part A

  • Using KVL:
  • Thus the two points for the load line are and
  • Overlay the above two points with the diode characteristics to find the answer.

Part B

  • Thevenin Equivalent: and
  • Using KVL: , thus and for the load line.
  • can be read from the load line graph. We can then use this information to find the voltage over .

Part C

  • Thevenin Equivalent: and

3.17

Part A

  • Guessing D1 is on, D2 and D3 are off. Looking at the voltage drops, this is very unlikely.
  • Guessing D1 off, D2 on, D3 off. and .
  • Checking for positive current through presumed on diodes and negative voltage across the presumed off diodes.
  • D1 and D2 fail. D3 passes.
  • Guessing D1 and D2 on, D3 off.
  • and . D1, D2, D3 pass.


Part B Need help on this one.

  • , : D1, D2, D3, D4 on.
  • , : D1, D2, D3, D4 on.
  • , : D2, D3 on. D1, D4 off.
  • , : D2, D3 on. D1, D4 off.

3.32

  • How does this circuit work?

3.33

P3.33.PNG

3.37