PWM strategy of bi-directional buck AC/DC converter for reducing output voltage ripple

Output ripple minimization of single-stage power factor corrected bi-directional buck AC/DC converter

“…The duty cycles of six switches are dap -din, respectively. The current references i�, i� and i; are highest, intermediate and lowest of input current references i�, i� and i�, respectively and they are expressed in terms of duty cycles and output current Ide in (6) - (8).…”

“…Several single-stage isolated AC/DC converters are developed in [3]- [7] which increases the overall size. Ripple minimization is an important feature of single-stage non-isolated PWM controlled converters [8] with a limited input phase control range is proposed with reduced number of commutations during the control period for reduced DC ripple. As power factor regulations are required to meet the standards additional switching pattens are included in [10] to improve the input source power factor.…”

Output Ripple Minimization of Single-Stage Power-Factor-Correction Bidirectional Buck AC/DC Converter

“…The PWM control method has restrictions towards the input phase angle ϕ * with limits of the control range of −π/6 ≤ ϕ * ≤ π/6 and 5π/6 ≤ ϕ * ≤ 7π/6 (8) .…”

“…Several single-stage isolated AC/DC converters (1)- (7) are developed for buck operation mode mainly achieved through a transformer, which finally increases the overall size of the converter system. Ripple minimization is an important feature of singlestage non-isolated PWM controlled converters (8) with a limited input phase control range is proposed with reduced number of commutations during the control period for reduced DC ripple. As power factor regulations are required to meet the standards, switching patterns (9) (10) are developed to improve the source power factor by controlling the input current of the converter.…”

Duality of PWM strategies between current and voltage source AC/DC converters for suppressing DC ripple

“…The duality of the PWM strategies for reducing the harmonics of the AC waveforms has been reported [7]. This paper presents the PWM strategy for reducing the ripples of the output DC current of the AC/DC voltage source converter which has the duality of the PWM strategy for reducing the ripples of the output DC voltage of the AC/DC current source converter [8]- [9]. The effectiveness of the proposed PWM strategy is verified by experiments.…”