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This paper proposes a novel single-phase ac to high voltage dc converter based on Cockcroft-Walton cascade rectifier with only adding one bi-directional switch and one boost inductor. This paper also derives a new method of circuit representation for Cockcroft-Walton cascade rectifier, which simplifies the equivalent circuit and is convenient for simulation. Compared with conventional Cockcroft-Walton...
In this paper, a new unidirectional three-level rectifier is presented to draw sinusoidal line current with low THD and unity power factor. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control are the main advantages of this rectifier. A two loop controller is developed to control the adopted rectifier. A voltage...
In this paper, a new control scheme is proposed for the new single-phase single-switch three-level rectifier to supply two different load with different voltages and draw sinusoidal line current with low THD. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control and three level voltage are the main advantages of...
This paper presents the EL modeling of the four-wire 3-level 3-phase NPC voltage source rectifier (VSR). The load current of the four-wire 3-level 3-phase could be expressed in two forms: the load current involving the current of capacitor C1, and the load current involving the current of capacitor C2. So that two EL models will be obtained for four-wire 3-level 3-phase NPC voltage source rectifier...
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