Voltage Multiplier Cells Applied to Non-Isolated DC–DC Converters

Abstract

This paper introduces the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on. The diodes reverse recovery current problem is minimized and the voltage multiplier also operates as a regenerative clamping circuit, reducing the problems with layout and the EMI generation. These characteristics allows the operation with high static again and high efficiency, making possible to design a compact circuit for applications where the isolation is not required. The operation principle, the design procedure and practical results obtained from the implemented prototypes are presented for the single-phase and multiphase dc-dc converters.A boost converter was tested with the single-phase technique, for an application requiring an output power of 100 W, operating with 12 V input voltage and 100 V output voltage, obtaining efficiency equal to 93%. The multiphase technique was tested with a boost interleaved converter operating with an output power equal to 400 W, 24 V input voltage and 400 V output voltage, obtaining efficiency equal to 95%.Index Terms-DC-DC power conversion, dc power system, switched circuits, voltage multipliers.

A Three-Phase AC-DC High Step-up Converter for Microscale Wind-power Generation Systems

“…1(b). Although Boost converters can be applied for the conversion of step-up voltage, a high voltage gain cannot be provided, which has led to the study of high gain step-up converters [19]- [24].…”

High Step-Up 3-Phase Rectifier with Fly-Back Cells and Switched Capacitors for Small-Scaled Wind Generation Systems

“…Currently, efficient technologies including coupled inductor [24][25][26][27][28] and switched capacitor [25,26,[29][30][31][32][33] are often adopted to improve the voltage conversion ratio.…”

“…Switched capacitors are also employed frequently in the proposed converters in [29][30][31][32][33]. In Figure 8, as energy snubbers, switched capacitors are able to store and deliver energy from the input source to the output load during one switching cycle, and therefore fulfill high step-up voltage conversion.…”

Soft Switched Voltage Multiplier Cell based DC-DC Converter for Automotive Applications

“…The introduction of voltage multiplier cell (VMC) based DC-DC converter is proposed in [6], [7], [8]. This provides a high step up gain.…”

“…In this paper, the losses in the main switch and diodes are minimized by incorporating soft switching technique which improves the efficiency by 2% compared to the converter in [8]. Further, the diodes stresses are half of the output voltage.…”