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This paper describes techniques for minimizing the input current distortion of current-controlled single-phase boost rectifiers. The switching patterns of several boost rectifiers are examined to identify the nature of their input current waveforms. This analysis is then used to examine the low-frequency current distortion levels, and hence power quality, associated with the rectifiers. A PWM strategy that selectively switches between positive unipolar PWM and negative unipolar PWM, called "phase-adjusted unipolar PWM," is shown to produce the lowest current distortion levels. A new 2-switch asymmetrical halfbridge rectifier is presented that draws an input current at a unity fundamental power factor and with the same low distortion as obtained with the 4-switch H-bridge rectifier. The operation of the various rectifiers is examined with reference to theoretical predictions, circuit simulations, and experimental results. This analysis, using a per-unit system based upon the magnitude of the rectifier inductor, is then used to compare the performance of the various rectifier switching patterns.