Abstract
Although the Pulse-Width-Modulation has been widely applied to several power converters to obtain high performance, it requires a smoothing do voltage or current. Thus, the PWM causes bulky and costly reactive components connected in the do-side of the converters to reduce the voltage or current ripples. To overcome the problem, the authors have proposed a new modulation scheme where time-integral-value in each modulation period of the modulated voltage or current is controlled to follow the variation of a reference signal. Thus, the ripples of the dc voltage or current do not cause modulation errors in Pulse Integral-value Modulated power converters, and a small dc smoothing inductor or capacitor is applicable to the converters.
The PIM (Pulse Integral-value Modulation) is applied to a single-phase buck-boost high-power-factor rectifier first. Then, several modified or extended versions to apply it to different power converters have been developed by referring the application of the conventional PWM.
This paper introduces the principle of the PIM and reviews operation, modulation mechanism and experimental result in different Pulse Integral-value Modulated power converters. The relation between the PIM and other control/modulation schemes and remaining subjects on the study of the PIM are briefly described.
