Abstract: A switching power converter capable of operation in either Nonconversion, Stepdown, or Stepup Mode. Included is a parallel circuit of three serial connections of a first, a second and a third pair of switches. The junction between the first pair of switches is connected to an a.c. input terminal via an inductor, the junction between the second switch pair grounded, and the junction between the third switch pair connected to an a.c. output terminal via another inductor. The first and third switch pairs are driven at the frequency (e.g. 50 Hz) of an a.c. input voltage, and the second switch pair at a higher frequency (e.g. 20 kHz), in Nonconversion Mode; the first switch pair at the low frequency, and the second and third switch pairs at the high frequency, in Stepdown Mode; and the first and second switch pairs at the high frequency, and the third switch pair at low frequency, in Stepup Mode. The second switch pair is invariably driven at the high frequency.

Abstract: A switching power converter capable of operation in either Nonconversion, Stepdown, or Stepup Mode. Included is a parallel circuit of three serial connections of a first, a second and a third pair of switches. The junction between the first pair of switches is connected to an a.c. input terminal via an inductor, the junction between the second switch pair grounded, and the junction between the third switch pair connected to an a.c. output terminal via another inductor. The first and third switch pairs are driven at the frequency (e.g. 50 Hz) of an a.c. input voltage, and the second switch pair at a higher frequency (e.g. 20 kHz), in Nonconversion Mode; the first switch pair at the low frequency, and the second and third switch pairs at the high frequency, in Stepdown Mode; and the first and second switch pairs at the high frequency, and the third switch pair at low frequency, in Stepup Mode. The second switch pair is invariably driven at the high frequency.