This paper presents EMC problems relative to the driver circuits of power converters. Driver circuits may create conducted and radiated interferences, but also may be disturbed by the power part of the converter, involving failures in the driver and converter distruction. Different insulated drivers circuit technologies (optic couplers, pulse transformers) are compared relatively to their vulnerability and their capability to transmit conducted parasitic currents or to radiate parasitic fields. Solutions will be proposed to minimize parasitic interferences transmitted or created in the driver circuit, to improve the converter safety and reduce the emission levels.
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