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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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**c03f34 Half-Wave Rectifier Tin**

Cause of ripple: the capacitor is discharged for almost an entire period.

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c03f36 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 Rectifier Alternative Drawing**

Full-Wave A.K.A. Bridge Rectifier Non-Inverting Inverting

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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**

Turn-on voltage 1/2 to account for inversion of negative peaks.

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**Maximum Reverse Voltage**

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

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**Compare Maximum Reverse Bias Voltage to Half-Wave Rectifier**

A reverse diode voltage must 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 Rectifier Alternative Drawing**

Full-Wave A.K.A. Bridge Rectifier Non-Inverting Inverting

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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 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 100**

uF to 470 uF. Reduced ripples

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Extra Slides

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**I-V Characteristic of LED**

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RECTIFICATION Normal household power is AC while batteries provide DC, and converting from AC to DC is called rectification. Diodes are used so commonly.

RECTIFICATION Normal household power is AC while batteries provide DC, and converting from AC to DC is called rectification. Diodes are used so commonly.

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