Rectifier and EMI filter for multiple led drivers

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Teddy Doloir

Joined Feb 9, 2019
15
I try to make a power supply stage for 2 offline led drivers insted of making 2 different boards. Find in atteched file the design A and B. Could you explain and suggest me what is the best design to follow ?
 

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ci139

Joined Jul 11, 2016
797
since the transformers are !usually! not too expensive the option A
(-1-) you'll loose only one OUTP shoulder at output fault
(-2-) you have lesser voltage drop on rectifier diodes
(-3-) you can use lower power transformers = lower reactance line filters

IF the LED-s are cheap and won't consume too much power the Opt. B would likely be more compact

+ you should in either case limit the inrush currents to transformers and/or to filter capacitors (at startup)
IF your rectifier bridges have parallel protection resistors to diodes you should protect the filter caps from "AC" at no load condition
 

Papabravo

Joined Feb 24, 2006
12,514
You have the transformer shown incorrectly. Wired this way is unsafe, hazardous, and potentially fatal. As such it violates the TOS for this site.
 

Thread Starter

Teddy Doloir

Joined Feb 9, 2019
15
Yes i know it is unsafe , but the HV9961 led driver can run with a rectified main voltage. The transformers are choke common mode used as EMI filters, not for voltage isolation.
 

ScottWang

Joined Aug 23, 2012
6,832
6. Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:

  • Any kind of over-unity devices and systems
  • Devices designed to electrocute or shock another person
  • LEDs to mains
  • Any kind of jammers (ie - Phone jammers)
  • Rail guns and high-energy projectile devices
  • Transformer-less power supplies
If You come across a thread or post discussing any of the above topics please report the thread so We can close, and if necessary remove, the offending thread/posts.

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If you want to change your mind to use the transformer then please click the "Report" button (under the last line of the message box) and write a simple description, thank you.
 
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