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Transformers

Karthik rajagopal

May 9, 2016
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Hi all,
I got a PCB from a VCR which has a tiny transformer in it. I am not sure whether it would step down 220v to a lower AC voltage. I typed the code written on the side of the transformer in Google but did not get any info regarding the transformer . I have attached the photos of the transformers. Please help me in getting the basic information on this transformer Thanks in advance.

DSC_0031.JPG

DSC_0032.JPG
 
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Minder

Apr 24, 2015
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It is a transformer for a SMPS (switch mode power supply).
Higher frequency application that 50/60Hz.
Could also be a double mode choke.
M.
 
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davenn

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Sep 5, 2009
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It is a transformer for a SMPS (switch mode power supply).
Higher frequency application that 50/60Hz.
Could also be a double mode choke.
M.

YES, they are chokes NOT transformers
 

Karthik rajagopal

May 9, 2016
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YES, they are chokes NOT transformers
Thanks for the reply. Just after your reply I came to know about these chokes . Searched in Google for me to get further information on that. But still not able to understand the exact function and its role in circuits. Please give me brief explanation so that my understanding becomes clear.
 

davenn

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But still not able to understand the exact function and its role in circuits. Please give me brief explanation so that my understanding becomes clear

They are used on the mains input before the bridge rectifier they along with capacitors are filters to stop switching noise from the SMPS from getting back out onto the mains line

L1 between C1 and C2 ......
30w-16v-Smps-Evaluation-Board-With-Coolset-F3r-Ice3br0665j.jpg



EM1 between C1 and C2 .....
40w-18v-Smps-Evaluation-Board-With-Coolsettm-F3-Ice3b2065p.jpg
 

Karthik rajagopal

May 9, 2016
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They are used on the mains input before the bridge rectifier they along with capacitors are filters to stop switching noise from the SMPS from getting back out onto the mains line
Thank you so much for the explanation.
 
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