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Inductor Symbol? What does this symbol indicate?

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3

$begingroup$

In the diagram below the symbol labeled L1 is described as:

1.5mH, Core: SM CM20 x 12 x 10

But what does this symbol show exactly? I have searched thoroughly and cannot find this symbol and am just not sure if this is a EMI/RFI Inductor or a simple Leaded core? or something else. The input voltage is 28 VDC and the two caps are 220uf @ 100V. The DC/DC convertor is an XP Power QSB300 300W isolated DC-DC Convertor.

voltage dc-dc-converter inductor conversion

share|improve this question

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Have a look at this question: electronics.stackexchange.com/questions/407633/…, it's a commonmode choke. The "Z" represent the cores of the inductors and that the inductors are (magnetically) coupled.
  $endgroup$
  – Bimpelrekkie
  May 21 at 6:08
  
  

  
  
  
  

add a comment | 

3

$begingroup$

In the diagram below the symbol labeled L1 is described as:

1.5mH, Core: SM CM20 x 12 x 10

But what does this symbol show exactly? I have searched thoroughly and cannot find this symbol and am just not sure if this is a EMI/RFI Inductor or a simple Leaded core? or something else. The input voltage is 28 VDC and the two caps are 220uf @ 100V. The DC/DC convertor is an XP Power QSB300 300W isolated DC-DC Convertor.

voltage dc-dc-converter inductor conversion

share|improve this question

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Have a look at this question: electronics.stackexchange.com/questions/407633/…, it's a commonmode choke. The "Z" represent the cores of the inductors and that the inductors are (magnetically) coupled.
  $endgroup$
  – Bimpelrekkie
  May 21 at 6:08
  
  

  
  
  
  

add a comment | 

$begingroup$

In the diagram below the symbol labeled L1 is described as:

1.5mH, Core: SM CM20 x 12 x 10

But what does this symbol show exactly? I have searched thoroughly and cannot find this symbol and am just not sure if this is a EMI/RFI Inductor or a simple Leaded core? or something else. The input voltage is 28 VDC and the two caps are 220uf @ 100V. The DC/DC convertor is an XP Power QSB300 300W isolated DC-DC Convertor.

voltage dc-dc-converter inductor conversion

share|improve this question

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked May 21 at 6:03

markwiggsmarkwiggs

162

New contributor

markwiggs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked May 21 at 6:03

markwiggsmarkwiggs

162

2 Answers
2

active

oldest

votes

6

$begingroup$

The symbol represents a common mode choke. They look like these:

(Source)

There are SMD versions as well. They are used to block common mode noise i.e. noise incident on both lines of power supply.

In the picture above (Source), you can see that common mode noise is coming on both lines in the same direction. At the same time, power is also coming on those lines. We intend to block just the common mode and not the power signal. This is how a common mode choke will help:

In the picture above (Source), you can see that when common mode noise (shown as RF current) and power signals (shown as load current) pass through the choke, they both try to generate their own magnetic fields. The arrangement is such that if there is a current entering as well as equal current leaving (the case with power), the fields will cancel each other and the signal wont be opposed. This is what we intend.

As far as the noise is concerned, the magnetic fields produced by the noise current adds up and it starts to oppose the noise from even entering (or exiting) the system. This is what we want for the noise - stop them from entering or exiting the system.

share|improve this answer

edited May 21 at 12:18

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Can you please provide links or citations for the images that you copied?
  $endgroup$
  – Elliot Alderson
  May 21 at 12:08
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Um I just copied it from google search results. Let me reverse image search for the links.
  $endgroup$
  – Whiskeyjack
  May 21 at 12:13
  

  
  
  
  

add a comment | 

0

$begingroup$

The symbol indicates it is a common-mode filter inductor.

share|improve this answer

answered May 21 at 6:22

JustmeJustme

3,3452413

$endgroup$

add a comment | 

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6

$begingroup$

The symbol represents a common mode choke. They look like these:

(Source)

There are SMD versions as well. They are used to block common mode noise i.e. noise incident on both lines of power supply.

In the picture above (Source), you can see that common mode noise is coming on both lines in the same direction. At the same time, power is also coming on those lines. We intend to block just the common mode and not the power signal. This is how a common mode choke will help:

In the picture above (Source), you can see that when common mode noise (shown as RF current) and power signals (shown as load current) pass through the choke, they both try to generate their own magnetic fields. The arrangement is such that if there is a current entering as well as equal current leaving (the case with power), the fields will cancel each other and the signal wont be opposed. This is what we intend.

As far as the noise is concerned, the magnetic fields produced by the noise current adds up and it starts to oppose the noise from even entering (or exiting) the system. This is what we want for the noise - stop them from entering or exiting the system.

share|improve this answer

edited May 21 at 12:18

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Can you please provide links or citations for the images that you copied?
  $endgroup$
  – Elliot Alderson
  May 21 at 12:08
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Um I just copied it from google search results. Let me reverse image search for the links.
  $endgroup$
  – Whiskeyjack
  May 21 at 12:13
  

  
  
  
  

add a comment | 

6

$begingroup$

The symbol represents a common mode choke. They look like these:

(Source)

There are SMD versions as well. They are used to block common mode noise i.e. noise incident on both lines of power supply.

In the picture above (Source), you can see that common mode noise is coming on both lines in the same direction. At the same time, power is also coming on those lines. We intend to block just the common mode and not the power signal. This is how a common mode choke will help:

In the picture above (Source), you can see that when common mode noise (shown as RF current) and power signals (shown as load current) pass through the choke, they both try to generate their own magnetic fields. The arrangement is such that if there is a current entering as well as equal current leaving (the case with power), the fields will cancel each other and the signal wont be opposed. This is what we intend.

As far as the noise is concerned, the magnetic fields produced by the noise current adds up and it starts to oppose the noise from even entering (or exiting) the system. This is what we want for the noise - stop them from entering or exiting the system.

share|improve this answer

edited May 21 at 12:18

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Can you please provide links or citations for the images that you copied?
  $endgroup$
  – Elliot Alderson
  May 21 at 12:08
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Um I just copied it from google search results. Let me reverse image search for the links.
  $endgroup$
  – Whiskeyjack
  May 21 at 12:13
  

  
  
  
  

add a comment | 

$begingroup$

The symbol represents a common mode choke. They look like these:

(Source)

There are SMD versions as well. They are used to block common mode noise i.e. noise incident on both lines of power supply.

In the picture above (Source), you can see that common mode noise is coming on both lines in the same direction. At the same time, power is also coming on those lines. We intend to block just the common mode and not the power signal. This is how a common mode choke will help:

In the picture above (Source), you can see that when common mode noise (shown as RF current) and power signals (shown as load current) pass through the choke, they both try to generate their own magnetic fields. The arrangement is such that if there is a current entering as well as equal current leaving (the case with power), the fields will cancel each other and the signal wont be opposed. This is what we intend.

As far as the noise is concerned, the magnetic fields produced by the noise current adds up and it starts to oppose the noise from even entering (or exiting) the system. This is what we want for the noise - stop them from entering or exiting the system.

share|improve this answer

edited May 21 at 12:18

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

$endgroup$

share|improve this answer

edited May 21 at 12:18

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

answered May 21 at 6:31

WhiskeyjackWhiskeyjack

4,53122265

0

$begingroup$

The symbol indicates it is a common-mode filter inductor.

share|improve this answer

answered May 21 at 6:22

JustmeJustme

3,3452413

$endgroup$

add a comment | 

0

$begingroup$

The symbol indicates it is a common-mode filter inductor.

share|improve this answer

answered May 21 at 6:22

JustmeJustme

3,3452413

$endgroup$

add a comment | 

$begingroup$

The symbol indicates it is a common-mode filter inductor.

share|improve this answer

answered May 21 at 6:22

JustmeJustme

3,3452413

$endgroup$

share|improve this answer

answered May 21 at 6:22

JustmeJustme

3,3452413

answered May 21 at 6:22

JustmeJustme

3,3452413

answered May 21 at 6:22

JustmeJustme

3,3452413