Download - Regulated Linear Power Supply
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Regulated Linear Power Supply
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Dual-Output Adjustable Linear Regulated Power
Supply
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Block Diagram
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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
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Tin
Half-Wave Rectifier
Cause of ripple: the capacitor is discharged for almost an entire period.
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inversion
Ripple Reduction: Do not allow the capacitor to discharge so frequently
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An Inverting Half-Wave Rectifier
If Vin >0, D1 and D2 are off.If Vin <0, D1 and D2 are on and Vout>0.
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An Non-Inverting Half-Wave Rectifier
If Vin >0, D1 and D2 are on, Vout>0.If Vin <0, D1 and D2 are off.
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Full-Wave Rectifier
Inverting
Non-Inverting
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Full-Wave RectifierAlternative Drawing
Inverting Non-InvertingFull-Wave A.K.A. Bridge Rectifier
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Using Constant Voltage Diode Model
Vout=-Vin-2VD, on Vout=Vin-2VD, on
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Input versus Output
|Vin|<2VD,on
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Addition of the Smoothing Capacitor
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Modification of Ripple Estimation Formula
Modification:1.Turn-on voltage2.1/2 to account for inversion of negativepeaks.
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Maximum Reverse Voltage
VB=VD,on
VA=VP
VAB=VP-VD,on
Maximum reverse voltage is approximately Vp
Vp is the amplitude of Vin
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Compare Maximum Reverse Bias Voltage to Half-Wave Rectifier
A reverse diode voltagemust sustain larger reverse bias voltage
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Currents as a function of time
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Application of Bridge Rectifier
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Summary
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A Voltage Regulator Circuit
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Schematic
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Full-Wave RectifierAlternative Drawing
Inverting Non-InvertingFull-Wave A.K.A. Bridge Rectifier
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Rectified Waveform
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Smoothing Capacitor
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LM317/LM337
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Without Load Resistance (CL=100 uF)
9.36 V and -9.36 V
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Load Assumption
• Assume that the load draws 0.2 A of current
• Load resistance: 9.36V/0.2A=36.5 Ohms
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Each capacitor is 100 uF.Resistor is 37.5 Ohms
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Use Reload update curves
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Increase capacitor from 100uF to 470 uF.
Reduced ripples
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Extra Slides
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I-V Characteristic of LED