Abstract
Bridgeless power factor correction (PFC) converters have a reduced number of semiconductors in the current flowing path, contributing to low conduction losses. In this paper, a new bridgeless high step-up voltage gain PFC converter is proposed, analyzed and validated for high voltage applications. Compared to its conventional counterpart, the input rectifier bridge in the proposed bridgeless PFC converter is completely eliminated. As a result, its conduction losses are reduced. Also, the current flowing through the power switches in the proposed bridgeless PFC converter is only half of the current flowing through the rectifier diodes in its conventional counterpart, therefore, the conduction losses can be further improved. Moreover, in the proposed bridgeless PFC converter, not only the voltage stress of power switches is lower than the output voltage, but the voltage stress of the output diodes is lower than the conventional counterpart. In addition, this proposed bridgeless PFC converter features a simple circuit structure and high PFC performance. Finally, the proposed bridgeless PFC converter is analyzed and designed in the discontinuous conduction mode (DCM). The simulation results are presented to verify the effectiveness of the proposed bridgeless PFC converter.
Highlights
In the past decades, AC-DC converters have been widely used in numerous power electronic equipment supplied by the power grid in order to obtain the DC voltage
Two bridgeless hybrid boost power factor correction (PFC) converters using the switched-capacitor structure were presented in [27]. All these bridgeless PFC converters can be applied for the high voltage applications, and their efficiency are improved compared to their conventional counterparts
This proposed bridgeless PFC converter is designed in discontinuous conduction mode (DCM)
Summary
AC-DC converters have been widely used in numerous power electronic equipment supplied by the power grid in order to obtain the DC voltage. In [11], a family of high-voltage gain hybrid switched-capacitor PFC converters were proposed and validated, which can achieve a high output voltage and good PFC performance. In [14], a single-stage boost PFC converter with zero current switching (ZCS) characteristic was proposed and studied, which has a high voltage gain. Two bridgeless hybrid boost PFC converters using the switched-capacitor structure were presented in [27]. All these bridgeless PFC converters can be applied for the high voltage applications, and their efficiency are improved compared to their conventional counterparts. By reducing the number of semiconductors in the current-flowing path and reducing the current stress of semiconductors, the proposed bridgeless PFC converter can achieve a reduced conduction losses and a higher efficiency compared to its conventional counterpart.
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