I.-Introduction-to-Diodes-and-Diode-Application.pptx

diodes introduction

1. Introduction to Diodes and Diode Applications ECE 211: Electronics 1: Electronic Devices and Circuits Prepared By: Engr. Muel Fred Ruiz For BSECE SEP 2A and 2B

2. Diode A diode is a two-terminal electronic component that conducts current primarily in one direction; it has low resistance in one direction, and high resistance in the other.

3. Example #1 From the given circuit, solve for V R1 and I.

4. Example #2 From the given circuit, solve for V R1 and I.

5. Rectification Rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electric charge. As we have seen, this is exactly what a semiconductor diode does.

6. Rectifier

7. Positive Half-wave Rectifier

8. Negative Half-wave Rectifier

9. Example #3 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

10. Average Voltage (DC Voltage)  

11. Example #4 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

12. Example #5 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

13. Full-wave Rectifier

14. Full-wave Rectifier using Bridge Network

15. Example #6 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

16. Average Voltage (DC Voltage)  

17. Full-wave Rectifier using Center-tapped Transformer

18. Diode Approximations

19. First Approximation Also known as the Ideal Diode Model .

20. Second Approximation Also known as the Simplified Diode Model . Material Forward Voltage Silicon (Si) 0.7 Germanium (Ge) 0.3 Gallium Arsenide (GaAs) 1.2

21. Third Approximation Also known as the Piece-Wise Linear Model .

22. Example #7 From the given circuit, solve for V RL and I RL .

23. Example #8 From the given circuit, solve for V RL and I RL .

24. Example #9 From the given circuit, solve for V RL and I RL .

25. Sine Wave    

26. Example #10 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

27. Assignment #2 From the given circuit, solve for V RL(DC) , V RL(rms) , I RL(DC) , and I RL(rms) .

28. Wave Shaping Circuits

29. Clippers

30. Clippers Clippers are networks that employ diodes to “clip” away a portion of an input signal without distorting the remaining part of the applied waveform.

31. Example #11 From the given circuit, plot the output signal.

32. Example #12 From the given circuit, plot the output signal.

33. Clampers

34. Clampers A clamper is a network constructed of a diode, a resistor, and a capacitor that shifts a waveform to a different dc level without changing the appearance of the applied signal. Clamping networks have a capacitor connected directly from input to output with a resistive element in parallel with the output signal. The diode is also in parallel with the output signal but may or may not have a series dc supply as an added element.

35. Example #12 From the given circuit, plot the output signal.