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This paper proposes the input impedance measurement technique of a switching mode power supply (SMPS) by the insertion loss approach. The insertion loss approach with the assumption condition is described. The common mode and the differential mode impedance are the key parameters which can be used to design the EMI filter effectively.
The common modulation strategy adopted for motor control in adjustable speed drives (ASDs) is pulse width modulation (PWM). The carrier frequency along with fast rise and fall time of the IGBTs employed results in non trivial common-mode (CM). The high dv/dt and di/dt causes shaft-voltage, which leads to bearing currents. This phenomenon has been well-known as one of the reason for premature bearing...
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