A New Bridgeless High Step-up Voltage Gain PFC Converter with Reduced Conduction Losses and Low Voltage Stress

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.For outputting high voltage, many conventional high step-up voltage gain PFC converters have been studied in the past decade [6][7][8][9][10][11][12][13][14][15][16]. Based on the Cockcroft-Walton (CW) structure, some high step-up voltage gain PFC converters were proposed in [6][7][8][9][10]. In [6], a three-stage CW PFC converter was proposed. This converter can achieve a high output voltage and a high PFC performance. In [7], a transformerless hybrid boost and CW PFC converter was presented. By adding the CW voltage multiplier (VM) stages, high output voltage and high power factor are obtained. A single-phase single-stage high step-up matrix PFC converter using CW-VM was proposed in [8]. By combining a four bidirectional-switch matrix converter and the CW-VM, a high step-up voltage gain is achieved. Based on [6], a more comprehensive analysis and validation were presented in [9]. Based on [9], an improved high step-up voltage gain PFC converter with soft-switching characteristic was introduced in [10]. Besides the CW structure, some efforts focused on the switched-capacitor PFC topology to produce the high output voltage [11][12][13]. 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. A high voltage gain PFC converter based on a hybrid boost DC-DC converter was presented in [12]. By integrating boost topology and the switched-capacitor voltage doubler, a high output voltage and nearly unity PF are produced. In [13], a hybrid single ended primary inductor converter (SEPIC) PFC converter using switched-capacitor voltage doubler was proposed, which also owns a high voltage gain and a good PFC performance. Other new PFC converter...

Control of Single-Phase Electrolytic Capacitor-Less Isolated Converter for DC Low Voltage Residential Networks

“…The i L Srms value is regulated according to the load power needs. Analyzing Figure 1, the dynamic model for current i L S considering the control variable u C 1 is written in (13), where sgn i L S u C 1 = u S 1 .…”

“…The time derivative of V 1 e i Ls , t must be negatively definite for all (i L s , t), according to 15) is obtained considering also (13). Analyzing the circuit presented in Figure 1, the dynamic model for voltage u C 1 is…”

“…The non-isolated topologies in their simplest version are classified according to the use of complete rectifier diode bridges. When a topology does not require one or more diode bridges, it is recognized as bridgeless [13]. In this case, they generally exhibit better performance due to the reduced number of semiconductor elements.…”

PFC Single-Phase AC/DC Boost Converters: Bridge, Semi-Bridgeless, and Bridgeless Topologies

“…CBP converters implement the Power Factor Correction (PFC) technique that consists of controlling the AC current demanded from the network in such a way that AC current is sinusoidal and in phase with the voltage of the supply network and, at the same time, they perform DC voltage regulation in their output. Basically, CBP converters behave as a resistive load for the electrical network, improving the power quality and overall efficiency and also by helping comply with the harmonic regulation IEC 1000-3-2 [7][8][9][10][11]. Another important aspect is that CBP converters may also avoid the use of active power filters between the power network and loads, which yields a more economic and suitable solution in these kinds of applications [12,13].…”

“…The conventional Interleaved BBC with two states can be modified as it was presented in [7]. The authors proposed to move switches and inductors before the rectifier bridge.…”