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Regulated Linear Power Supply

Regulated Linear Power Supply. Dual-Output Adjustable Linear Regulated Power Supply. Block Diagram. 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.

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Regulated Linear Power Supply

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  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 • Modification: • 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

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

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

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

  29. Use Reload update curves

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

  31. Extra Slides

  32. I-V Characteristic of LED

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