diode circuits. voltage regulation rectifier circuit
TRANSCRIPT
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Diode Circuits
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Voltage Regulation
RectifierCircuit
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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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Application of Limiting Circuits
Limit the signal amplitude at a suitable point in the receiver
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Characteristic of a Limiting Circuit
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A Simple Limiter
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General Limiter Circuit
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Application of Voltage Doubler
Electronic systems typically provide a global supply voltage: 3V
Design of some circuits will be simplified if they from a higher supply voltage.
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Voltage Doubler
Floating Capacitor Capacitor Divider
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Capacitor Diode CircuitIdeal diode. Vout pinned to 0 V
Positive charges begin to leave the leftPlate of C1, turning D1 off.
C1 is now a floating capacitor
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Generating 0 to 2Vp Waveform
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Peak Detector
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Voltage Doubler
Peak Detector0 to 2Vp waveform
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Diode as a Voltage Shifter
Application:
We may need to shift the average level of a signal up and down because the subsequent stage (e.g. an amplifier) may not operate properly with the present dc level.
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A Simple Level Shift
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Shift up the DC by 2 VD, On
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A simple electronic switch
CK is 1: I1=1, diodes are shorted, and Vin=Vout.
CK is 0,diodes are off, charges are storedacross C1.