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New bridgeless single-phase ac-dc power factor correction (PFC) rectifiers based on Sepic and Cuk topologies are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved thermal management compared to the conventional Sepic and Cuk PFC converters. The proposed...
This paper presents a novel control strategy for cascaded H-bridge based multilevel rectifiers (CHBBR) to operate under unbalanced load and dc-bus voltage conditions. The proposed control strategy exploits the power factor as a degree of freedom to stabilize the rectifier operation. The controller is designed for single-phase seven-level rectifiers and its main feature is that it allows the multilevel...
A prototype single-stage half-bridge power converter is presented in this paper. This novel single-stage half-bridge power converter is formed from the integration of one half-bridge ac/dc power factor corrector (PFC) and one half-bridge dc/dc post-regulator by the component placement technique. The operations in the proposed power converter are discussed thereby verifying the feasibility and functionality...
New bridgeless single phase AC-DC power factor correction (PFC) rectifiers based on Sepic and Cuk topologies are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle results in less conduction losses and improved thermal management compared to the conventional Sepic and Cuk PFC converters. The proposed...
A novel three-phase full-bridge power factor corrector is presented in this paper. The corrector operates in discontinuous conduction mode (DCM), the peak of input current follows the input voltage automatically. It can achieve zero-voltage-switching (ZVS) for the leading-leg switches and zero-current-switching (ZCS) for the lagging-leg switches without adding any auxiliary device. Due to the adoption...
A new push pull boost ac-dc or dc-dc single stage pulse width modulated (PWM) converter is proposed. The converter operates with zero voltage switching (ZVS), and continuous input current. It feature several merits such as single stage energy processing and good input current shaping. The converter topology also has zero turn-on loss even when used with hard switching. An auxiliary switch clamps the...
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