Transcript
7/30/2019 Electronics Choke
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PRESENTED BY:
Sushree sangita dash
Electrical engg6th semistar
Regd-f1006602050
Group- 03
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CONTENTS:
Introduction
Component list Circuit digram
Working principle of electronics choke
Advantages
Disadvantages
Application
Conclusions
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INTRODUCTION:
A choke is one of the vital components of
flurocent lamp.It creats a high voltagestorage across the lamp electrodes duringstarting to indicate discharge through thelow pressure gaseous medium between theelectrodes. It also limits the current,
during normal operation after thedischarge have been established.inbeginning conventional coil wound chokewere in use but with the change intechnology this have been started replacing
with electronic chokes.this chokes save about35 to 40% of
energy as compared to conventional chokesgiving better luminescence.They can glowat lower voltage compared to conventional
coil wound choke
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Component list
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Working principle A choke is an inductors .inductor have many
applications : tuning,filtering etc.when used
for filtering particularly in power suppliesinductors are often referred to as chokes.
A choke in a power supply is placed in serieswith the line to add filtering.in the earlystage of power supply , say right after the
rectifiers, there will be a lot of ACcomponent riding on the DC
In operation ,as current increases,a chokeresists the change by storing the energy in amagnetic field;half a cycle later when the
current starts to drop,the chokes magneticfield beings to collapse and in doingso,dumps current back into the line ,thussmoothing it and reducing the ACcomponent
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Chokes are more common in highvoltage/low current powersupplies.They were very commonlyused in vacuumtube equipment wherepower supplies had to deliver on the
order of 300 VDC. In todays lowvoltage/high current supplies,most ofthe filtering is accomplished witcapacitors.
Filter capacitors are placed across theline and will be large and expensive ifthey have to support high voltage.filterchokes are placed in series with the line
and get large and expensive if they haveto carry a lot of current.
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Advantages Electronics choke increase lamp
efficency by keeping more vaporized inthe arc stream.
Electronics choke are smaller andlighter
Electronic choke cooler than magneticchoke
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Disadvantages Electronics are more expensive than an
equivalent line frequency ballast
Electronics choke are less robustlyconstucted than line frequncy choke
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CONCLUSION:
Hence we got a clear idea about CRO wealso got knowledge about workingpriciple of CRO
We also got knowledge that by using crowe can measure current,voltage,phasediffernce and frequncy.
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THANK YOU
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