Full Wave Rectifiers-Basic Electronic Engineering-Lecture Slides, Slides for Basic Electronics. Institute of Company Secretaries of India - ICSI
saraswathi
saraswathi17 July 2012

Full Wave Rectifiers-Basic Electronic Engineering-Lecture Slides, Slides for Basic Electronics. Institute of Company Secretaries of India - ICSI

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This lecture was delivered by Dr. Burman Sanyal at Institute of Company Secretaries of India - ICSI for Basic Electronic Engineering course. Its main points are: Full-wave, Bridge, Rectifiers, Diodes, Forward, Reverse, B...
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Basic Electronic Engineering

Basic Electronic Engineering

Lecture 4

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Full-Wave Rectifiers

• Full-Wave bridge rectifier uses four diodes

• Two diodes are forward and two are reverse biased at a time

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Full-Wave Rectifiers

• During positive cycle

• During negative cycle

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Full-Wave Rectifiers

• Output voltage

( ) (sec) 1.4p out pV V V 

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Full-Wave Rectifiers

• Peak Inverse Voltage

( ) 0.7p outPIV V V 

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Power Supply

• Rectifier converts ac voltage into fluctuating dc voltage

• Filter reduces the fluctuations and produces a relatively smooth output

• Regulators maintain a constant dc voltage for the variations in input voltage or variations in load

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Filters

• The filter removes the voltage variations at the output of a rectifier

• Filter is a capacitor connected to ground

• Fluctuations at the output of the filter are called ripples

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Filters

Initial Charging

Discharging Cycle

Charging Cycle

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Filters

• Ripple Voltage The variation of capacitor voltage due to charging and discharging is called the ripple voltage

• Full wave rectifiers are

easier to filter because

shorter time between

peaks

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Filters

• Ripple Factor

Ripple Factor (r) is the ratio of peak to peak ripple voltage to the average value of filter’s output

Small ripple factor indicates effective filtering

( ) r pp DC

VRipple Factor r V 

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Filters

• Find the ripple factor for the filtered bridge rectifier

( ) ( ) 1

r pp p rect L

V VfR C       

( ) 11 2DC p rectL

V VfR C       

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Diode Limiters

• A limiter (clipper) is a circuit that clips or limits a voltage signal

• Positive Clipper

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Diode Limiters

• Negative Clipper

• The output voltage level depends upon the voltage divider configuration

1

L out in

L

RV VR R     

 

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Diode Limiters

Biased Limiters

Clipping level can be adjusted by adding a bias voltage in

series with the limiter

Biased Positive Clipper

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Diode Limiters

• Biased Negative Clipper

• Limiters can be modified to limit signal above certain value

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Diode Limiters

• Limiters can be modified to limit signals below certain value

Find the output voltage waveform of the following circuit?

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Diode Limiters

• Voltage Divider Bias

Bias voltage can be replaced by a resistive network and a fixed supply voltage

3

2 3 BIAS SUPPLY

RV VR R     

 

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Diode Limiters

• Describe the output voltage waveform of the diode limiter?

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Diode Clampers

• A clamper adds a dc level to an ac voltage

• The capacitor charges to

• Diode is reverse biased just after the negative peak

( ) 0.7p inV V

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Diode Clampers

• Capacitor discharges from the peak of one negative half cycle to the peak of next negative half cycle

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Diode Clampers

• If the diode is turned around the clamper will start to add negative level to the ac wave

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Diode Clampers

• What output voltage would be observed across RL in the clamping circuit. Assume RC is large enough to prevent significant capacitor discharge.

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Voltage Multipliers

Half-Wave Voltage Doubler

Positive Half Cycle

Negative Half Cycle

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Voltage Multipliers

Full-Wave Voltage Doubler

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