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In this paper, an integrated single-switch approach to improve harmonic performance of standard pulsewidth modulation adjustable-speed drives (ASD's) is presented. The approach is essentially an add-on solution to a standard ASD topology. The approach is based on circulating a third harmonic current to reduce the harmonics of the line current. The dynamic braking chopper available in standard ASD's is used to control the amplitude of the third harmonic circulating current. Analysis, design, anddoi:10.1109/28.855978 fatcat:j2osiref5bdk7kfloq5qpzcw4m