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This paper presents a non-dissipative snubber circuit for minimizing switching losses in a single-phase single-stage power factor correction (PFC) converter. The snubber reduces the commutation losses for a bidirectional switch, which is used in the PFC. Due to input voltage for the PFC is a sinusoidal waveform, conventional snubber circuits on the main switch, developed for typical dc-dc converters,...
A novel single-stage three phase high power factor converter based on three-level zero-voltage and zero-current soft-switching circuit is proposed, which can mitigate a contradiction between voltage rating of power switches and high-power factor in the conventional three-phase single-switch DCM boost power-factor correction circuit and provides softs-witch for all power switches. The three-level structure...
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input applications...
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...
The characteristics of Cuk converters in discontinuous-capacitor-voltage mode are studied. A Cuk converter in this mode of operation is an inherent power factor corrector and features soft turn of switching. This paper proposes a Cuk converter in discontinuous-capacitor-voltage mode (DCVM) operation in order to reduce the total harmonic distortion (THD) of a three-phase rectifier. In the proposed...
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...
In this paper, two switchable power converters, integrated SEPIC/boost and flyback/boost, are described, analyzed and designed for power factor correction applications with multiple line input voltages (e.g. 120 Vrms and 277 Vrms). The range-selection switch can configure the converter to boost topology at low line input voltages, and to SEPIC or flyback topology at high line input voltage. As a result,...
In single stage, power factor correction circuits, the high voltage of the bulk capacitor is a common problem. This paper analyses the reason for this problem and then proposes a novel boundary conduction mode (BCM) of PFC circuit to solve the problem. Based on the analysis of the boundary point of the PFC converter and the DC-DC converter, the analytic formulation of the working principle of the...
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