2) Resonance countermeasures

A surge can enter the circuitry after where the surge absorber is placed between the power line and (point A in figure) GND.
This residual voltage can be amplified by LC resonance of a noise filter and/or a coil and destroy the circuitry after it. The can be prevented by placing a surge absorber (GDT2 and GDT3) before and after the common mode coil;

 

 

 

Recommended Parts

  AC Withstand Voltage Test GDT1 MOV GDT2, GDT3
~ 125VAC
Test not required CDA70-401L
DE37-401W
220 ~ 270V
(φ10mm)
CDA70-301L
CDA70-401L
CDA70-501M
DE37-401W
DE37-501M
1000VAC
1200VAC
CDA70-272M
CDA70L-272M
FA55-272
~ 250VAC Test not required CDA70-501M
DE37-501M
470 ~ 680V
(φ10mm)
1500VAC CDA70-302M
CDA70L-302M
FA55-302
1800VAC CDA70-362M
CDA70L-362M
FA55-362
2000VAC FA55-402
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