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18 - UPS Rectification Principles

The document discusses the principles and types of rectification, including full-wave and three-phase full-wave rectifiers, which convert AC to DC using diodes. It also explains controlled rectification using thyristors to adjust the DC output voltage. Rectifiers are essential in various power applications, allowing for the conversion and control of electrical current.

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kargue prospere
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38 views10 pages

18 - UPS Rectification Principles

The document discusses the principles and types of rectification, including full-wave and three-phase full-wave rectifiers, which convert AC to DC using diodes. It also explains controlled rectification using thyristors to adjust the DC output voltage. Rectifiers are essential in various power applications, allowing for the conversion and control of electrical current.

Uploaded by

kargue prospere
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Uninterrupted Power Supply:

Rectification

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Content

Principle of Rectification

Full-Wave Rectifier

3 Phase – Full Wave Rectifier

Controlled Rectification

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Principles Of Rectification :

• A diode is a device that allows


current to flow freely in one
direction but presents a high
resistance to it if it flows in the
other. It does not necessarily stop
the reverse flow but in many
applications, it is regarded as
blocking it completely.

• The first diode was the Fleming


thermionic tube.

• Fig 6.1 indicates some common


uses of diodes.

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Full – Wave Rectifier

• In Fig 6.2, when 4 diodes are


connected in the form of a bridge. It
turns the negative half wave into a
positive.

• This arrangement is called full wave


rectification.

• The smoothed mean D.C. level is


higher than in the half wave case. It is
in fact 0.635 times the amplitude or
0.9 times the rms value of the current.

• The full bridge is sometimes drawn in


the alternative manner.

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3 Phase – Full Wave Rectifier

• The idea of a full bridge rectification


can be extended to a 3 phase.

• Here a 6 diode bridge is connected


to receive a 3 phase supply. The
arrangement is smoother and it
produces a smoothed low ripple
direct current.

• The smoothed mean D.C. level is


higher than the full wave single
phase. It is 0.995 times the
amplitude or 1.35 times the rms
value.

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Controlled Rectification :

• The D.C. voltage output can be


controlled by substituting 3 of the
diodes with 3 thyristors.

• A thyristor is a solid state device


like a diode but with a 3rd electrode.
This prevents the device from
passing even forward current until
the 3rd electrode is triggered.

• The firing can be deliberately


delayed.

• An electronic circuit provides a


firing pulse with a variable delay.

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Summary:
• Rectifiers are used in many power work applications.

• They all have a one way blocking function.

• They can be used to convert A.C. into D.C.

• If diodes are used for ac. To D.C. conversion the D.C. level is fixed depending on
the input A.C.

• With the use of thyristors the D.C. level can be controlled within broad limits. In
this form, they are used in battery charging, for applying variable D.C. voltage to
drilling

• Motors to regulate their speed.

Legend:
AC – Alterative Current
DC – Direct Current

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Bridge Rectifier Animation

https://www.youtube.com/watch?app=desktop&v=PfWmIQfYIRI

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What Is A Rectifier? (AC To DC)

https://www.youtube.com/watch?app=desktop&v=5cbQNfO0Mwg

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Thank You

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