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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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