1. Regulated Linear Power Supply

2. Dual-Output Adjustable Linear Regulated Power Supply

3. Block Diagram

4. Simple Description
Transformer: “Downconvert” the AC line voltage to a smaller peak voltage Vm, usually about 2-3 Volts larger than the ultimately desired DC output.
Diode Rectifier Circuit: produce a waveform with large DC component.
Filter: smooth out the rectified sinusoid.
Regulator: eliminate residual ripple

5. c03f34 Half-Wave Rectifier Tin
Cause of ripple: the capacitor is discharged for almost an entire period.

6. c03f36
inversion
Ripple Reduction: Do not allow the capacitor to discharge so frequently

7. An Inverting Half-Wave Rectifier
If Vin >0, D1 and D2 are off.
If Vin <0, D1 and D2 are on and Vout>0.

8. An Non-Inverting Half-Wave Rectifier
If Vin >0, D1 and D2 are on, Vout>0.
If Vin <0, D1 and D2 are off.

9. Full-Wave Rectifier
Inverting
Non-Inverting

10. Full-Wave Rectifier Alternative Drawing
Full-Wave A.K.A. Bridge Rectifier
Non-Inverting
Inverting

11. Using Constant Voltage Diode Model
Vout=-Vin-2VD, on
Vout=Vin-2VD, on

12. Input versus Output
|Vin|<2VD,on

13. Addition of the Smoothing Capacitor

14. Modification of Ripple Estimation Formula
Turn-on voltage
1/2 to account for inversion of negative
peaks.

15. Maximum Reverse Voltage
VB=VD,on
Vp is the amplitude of Vin
VA=VP
VAB=VP-VD,on
Maximum reverse voltage is approximately Vp

16. Compare Maximum Reverse Bias Voltage to Half-Wave Rectifier
A reverse diode voltage
must sustain larger reverse bias voltage

17. Currents as a function of time

18. Application of Bridge Rectifier

19. Summary

20. A Voltage Regulator Circuit

21. Schematic

22. Full-Wave Rectifier Alternative Drawing
Full-Wave A.K.A. Bridge Rectifier
Non-Inverting
Inverting

23. Rectified Waveform

24. Smoothing Capacitor

25. LM317/LM337

27. Without Load Resistance (CL=100 uF)
9.36 V and V

28. Load Assumption Assume that the load draws 0.2 A of current
Load resistance: 9.36V/0.2A=36.5 Ohms

29. Each capacitor is 100 uF.
Resistor is 37.5 Ohms

30. Use Reload update curves

31. Increase capacitor from 100
uF to 470 uF.
Reduced ripples

32. Extra Slides

33. I-V Characteristic of LED