| Abstract |
Mis-operation caused by EMI in power electronic equipment is a troublesome problem that often
occurs during design and operation process. This paper is mainly focused on EMI sources,
propagation characteristics, and suppression schemes in power electronic equipment. As an example,
disturbances in the control circuit of a 6kW charger with a mis-operation fault are measured. The EMI
caused by switching device IGBT in the main circuit and driving pulses in the control circuit are
compared. Then by a system function approach, the high pass characteristic of EMI coupling path
from the main circuit to the control circuit board is analyzed. Using the system function, EMI in the
control circuit caused by the IGBT is predicted. To diagnose the mis-operation in the control circuit,
susceptibilities of several digital logic integrated circuits(ICs) to pulse like EMI, and suppression
schemes are studied through experiments. As a result, mis-operation in the control circuit of the
charger is eliminated. |
