Overview:
The common mode current of a non-isolated power supply can become an electromagnetic interference (EMI) source. Have you ever eliminated it? In some high-voltage power supplies, such as the ones used in LED bulbs, you may find that you cannot eliminate them. After careful inspection, it was found that the non-isolated power supply is no different from the isolated power supply. The switching node grounds the parasitic capacitance to produce a common mode current.
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Damping and Absorption Capacitors
MKP capacitor
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