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Study and Analysis of the Carrier Distortion Sources in PWM Analog DCI-NPC Modulator

In this work, it is studied and analyzed an Analog PWM Modulator for a Half-Bridge DCI-NPC Amplifier (Diode Clamped Inverter - Neutral Point Clamped) as one of the sources of distortion in the switching amplification chain. The four types of error or distortion sources are studied and analyzed: Carriers Offset Error (COE), Carriers Phase Error (CPE), Carriers Symmetry Error (CSE) and Carriers Amplitude Error (CAE). This paper concludes that the two major sources of error or distortion in PWM modulation process for DCI-NPC topology are the Amplitude (CAE) and Offset (COE) Errors, the latter being largest contributor to the total distortion.

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