High Step-Up Interleaved Converter Mixed With Magnetic Coupling and Voltage Lift

Abstract

In this paper, a non-isolated high step-up interleaved DC-DC converter for distributed generation applications such as solar cells and fuel cells. The proposed converter mixes the benefits of magnetic coupling, voltage multiplier, and voltage lift techniques to conventional interleaved schemes. The proposed converter's voltage lift technique can increase the voltage gain while guaranteeing low voltage stress of the switches. And the magnetic coupling method can combine the switched capacitor of the voltage multiplier technique with the lossless clamp circuit to achieve high voltage gain and reuse the leakage inductance energy to the output terminal. In addition, this leakage inductance energy can achieve zero current switching turn on soft switching performance and mitigate the output diode reverse recovery problem. The proposed converter avoids the extreme duty cycles that cause conduction losses in power devices and can give very low voltage stresses. Therefore, the use of low voltage rated MOSFETs and diodes not only reduces switching losses and costs, but also improves efficiency. INDEX TERMS High voltage gain, magnetic coupling, non-isolated, voltage lift (VL) technique, zero current switching (ZCS).

Nonisolated high step‐up DC‐DC interleaved SEPIC converter based on voltage multiplier cells

“…Several high step‐up two‐phase interleaved dc‐dc topologies can be easily found in the recent literature, but most structures are designed for power levels rated at only a few hundred watts and based on the boost converter. After an extensive search carried out by the authors, only the boost‐type converters reported in Jyotheeswara Reddy and Sudhakar, 30 Nouri et al, 34 and Seo et al 35 were found to achieve a rated power greater than or equal to 1 kW. Overall, it is reasonable to state that the choice of a winning topology should not rely on the voltage gain only, but also on other important characteristics associated with the application.…”

Improved auxiliary inductive coil connectors in DC boost converters with high voltage gain for renewable energy source applications

“…The voltage-lift methods (VLs) are an effective approach for increasing the output voltage level in high step-up converters. This procedure requires charging a capacitor to a different voltage and then stepping up the output voltage to matching the charged capacitor's voltage level or a multiple-lift circuit employing an n-stage basic diode capacitor VLs circuit was described in [23]- [25] to further rise the VLs. Furthermore, the elimination of magnetic components causes significant current spikes in switching transients.…”

High step‐up interleaved DC‐DC converter for photovoltaic systems

“…Various techniques have been presented to tackle the disadvantages of the boost converter such as hard switching, output diode recovery current problem at turn-off, high peak voltage across the switch, and low voltage gain [6]. Switched capacitor, voltage multiplier cells, switched inductor and voltage lift techniques, and magnetic coupling are the major techniques that have been proposed [7][8][9][10][11][12][13]. A hybrid switched inductor converter is used in [14] which does not have a direct connection between the input and output voltage ground and can cause the risk of leakage current in grid-connected PV systems.…”