86f7Half-Wave Rectifier

8/7/2019 86f7Half-Wave Rectifier

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Group MembersGroup Members

M. Fawaid Javed 08M. Fawaid Javed 08--EEEE--016016

Shahid Imran 08Shahid Imran 08--EEEE--017017


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RectifierRectifier

The rectifier converts the ac inputThe rectifier converts the ac inputvoltage to a pulsating dc voltagevoltage to a pulsating dc voltageT

here are two types of rectifier.T

here are two types of rectifier.1.1. HalfHalf--wave rectifierwave rectifier

2.2. FullFull--wave rectifierwave rectifier

..


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HalfHalf--Wave RectifierWave Rectifier

When aWhen a diode isdiode is connectedconnectedtoto aa sourcesource ofof alternatingalternating voltage,voltage, ititwillwill bebe alternately forwardalternately forward--biased, andbiased, and

then reversethen reverse--biased, during each cycle ofbiased, during each cycle ofthe AC sinethe AC sine--wave. When a single diode iswave. When a single diode isused in a rectifier circuit, current will flowused in a rectifier circuit, current will flowthrough the circuit only during onethrough the circuit only during one--half ofhalf ofthe inputthe input voltagevoltage cycle. Forcycle. For thisthis reason,reason,thisthis rectifier circuitrectifier circuit isis calledcalled a halfa half--wavewaverectifier.rectifier. The output of a halfThe output of a half--wavewaverectifier circuit is pulsating DC.rectifier circuit is pulsating DC.


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Average Value of the HalfAverage Value of the Half--WaveWave

Output voltageOutput voltageThe average value of the halfThe average value of the half--wavewave

rectifier output voltage is the value yourectifier output voltage is the value youwould measure on dc voltmeter.would measure on dc voltmeter.

Mathematically it is determined by findingMathematically it is determined by findingthe area under the curve over a full cyclethe area under the curve over a full cycleand then dividing by 2pi the no of radiansand then dividing by 2pi the no of radiansin a full cycle.in a full cycle. VVpp is the peak value ofis the peak value of

voltage.voltage.

VVAVGAVG=V=VPP/pi/pi


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Effect of Barrier Potential on theEffect of Barrier Potential on the

HalfHalf--wave Rectifier Outputwave Rectifier OutputWhen the practical diode model is usedWhen the practical diode model is used

with the barrier potential of 0.7Vwith the barrier potential of 0.7V

taken into account , this is whattaken into account , this is whathappens. During the positive halfhappens. During the positive half--cycle , the input voltage mustcycle , the input voltage mustovercome the barrier potential beforeovercome the barrier potential before

the diode becomes forwardthe diode becomes forward--biasedbiased


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ContinueContinue

This results in a halfThis results in a half--wave outputwave outputwith a peak value that is 0.7V lesswith a peak value that is 0.7V less

than the peak value of the input.than the peak value of the input.

VVp(out)p(out)=V=Vp(in)p(in)--0.7V0.7V


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Peak Inverse ValuePeak Inverse Value

PIV=VPIV=Vp(in)p(in)


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HalfHalf--Wave Rectifier withWave Rectifier with

TransformerTransformer--C

oupled Input voltageC

oupled Input voltage


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HalfHalf--Wave Rectifier withWave Rectifier with

TransformerTransformer--C

oupled Input voltageC

oupled Input voltage

VVp(out)p(out)=V=Vp(sec)p(sec)--0.7V0.7V

PIV=VPIV=Vp(sec)p(sec)


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thank you.thank you.

86f7Half-Wave Rectifier

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