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500W on/off controlled offline SMPS?

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Flyback

Well-Known Member
Hi,
Attached (LTspice and PDF schem) is a 500W offline Full Bridge SMPS in on/off control. Its duty cycle is clamped at just above the max that it would need to be if this was a “normal” full bridge.
Current limit is at the peak needed for max power.
There is no slope compensation as its not needed, even though duty cycle is 0.68.
Would you say there is any reason that this SMPS should fail EMC, compared to a “normal” frequency compensated Full Bridge?
 

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  • FB 500W 175V_onoff control.asc
    12.7 KB · Views: 208
  • 500W onoff control fullbridge.pdf
    178.8 KB · Views: 191
Where is/are the EMC filters? Failing EMC is more about the PCB and things not in the schematic.
 
Thanks, the EMC filter would be added. as you say, .........the situation was to demonstrate the workings of the on/off control, and to ask whether that itself would cause EMC failure, even if an EMC filter were added......or......whether the on/off control would mean a bigger EMC filter being needed?
 
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