A novel PWM scheme for single-phase three-levelpower-factor-correction circuit |
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Authors: | Bor-Ren Lin Hsin-Hung Lu |
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Affiliation: | Dept. of Electr. Eng., Nat. Yunlin Univ. of Sci. & Technol.; |
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Abstract: | This paper presents a control scheme for a single-phase AC-to-DC power converter with three-level pulsewidth modulation. A single-phase power-factor-correction circuit is proposed to improve the power quality. The hysteresis current control technique for a diode bridge, with two power switches is adopted to achieve a high power factor and low harmonic distortion. A control scheme is presented where the line current is driven to follow the reference sinusoidal current which is derived from the DC-link voltage regulator, the capacitor voltage balance compensator and the output power estimator. The blocking voltage of each power device is clamped to half of the DC-link voltage. The high power factor and low current total harmonic distortion are verified by computer simulations and hardware tests |
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