Hybrid Switched-Inductor Converters for High Step-Up Conversion

Abstract

In applications where the high voltage gain is required, such as photovoltaic grid-connected system, fuel cell and high intensity discharge (HID) lamps for automobile, high step-up DC-DC converters have been introduced to boost the low voltage to a high bus voltage. The voltage gain of traditional Boost converter is limited considering the issues such as the system efficiency and current ripple. This paper proposes a class of hybrid switched-inductor converters for high step-up voltage gain conversion. Firstly, the topological derivation of hybrid switched-inductor converters is deduced by combining the passive and active switched-inductor unit; secondly, this paper illustrates the operation modes of the proposed asymmetrical and symmetrical converters; thirdly, the performance of the proposed converters is analyzed in detail and compared to existing converters; finally, a prototype is established in the lab, and the experimental results are given to verify the correctness of the analysis.Index Terms-Switched-inductor, high step-up, DC/DC converter.

High Step-up DC-DC Converter by Switched Inductor and Voltage Multiplier Cell for Automotive Applications

“…The switch utilization factor of the proposed type-II converter is the best compared to all other converters except the converter in [21]. Proposed Type-II converter and converter in [21] are the best for diode and switch utilization factor respectively. Diode utilization factor of the multiplier cell is high for proposed Type-II converter.…”

“…The proposed converter is compared to some of the recently introduced high step-up converter in the literature [7,20,21]. The following parameters are compared:…”

“…The voltage gains of the proposed converter type-I and type-II are compared with the converters in [7,20,21]. It is found that voltage gain of the type-I and type-II converters are very high for almost various duty ratio.…”

“…Fig. 5(a) shows the voltage gain (G  ) against the duty ratio of the proposed converter and converters in [7,20,21] at CCM operation. The voltage gain of type-II topology is increased by M+1 times of quadratic boost converter, where the M= number of voltage multiplier cell.…”

High step-up quasi-Z-source DC–DC converters with single switched capacitor branch

“…The output voltage gain of the proposed SC-qZSC Type-1 is plotted in Fig.7as a function of the duty ratio D, and compared with the3-Z-network boost converter in [6], the symmetrical hybrid switched-inductor converter (SH-SLC) in [16], the converter in [19] (the turns ratio of the coupled inductor is set to 1), the high step-up converter with double inductor energy storage cell based switched-capacitors (DIESC-SC converter) in [20], and the conventional ZSC in [30] (Table 2).…”