Why Diode Parallel with Capacitor And Resistor

Thread Starter

Venkateszr

Joined Aug 30, 2018
25
Why Capacitor and resistor Connected to Series and then parallel to Diode in Highlighted area at Given Attachment?

Thank you.
 

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digsys

Joined Jun 27, 2018
27
Actually, it is interesting ... Top 1/2 bridge uses 4.7R 0.5W + 0.01uF across each diode. Next 1/2 bridge below uses 1.5R 0.01uF across
the 2 diodes .. Top return diodes have no emi filtering .. all have serious LC filtering after the bridge. Weird setup.
My guess would be RFI / EMI supression, as the C value is quite low. Sure is a HECK of a busy circuit, designer must have been on speed :)
 

MisterBill2

Joined Jan 23, 2018
13,194
One more possibility is that while they show on the circuit they are not present in the actual product. I see that in a lot of consumer electronic devices.
 
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