Zero‐current‐switching bidirectional interleaved switched‐capacitor DC–DC converter: analysis, design and implementation

Abstract

The study presents experimental verification of a zero-current-switching (ZCS) bidirectional interleaved switched-capacitor (BISC) DC-DC converter that features bidirectional power flow capability and a high-voltage conversion ratio. In addition, the interleaved configuration of the converter and its modular design enable both its current rating and voltage gain to be increased. At the same time, the converter does not exhibit current spike issues, which is achieved by employing stray inductance distributed throughout the circuit, rather than relying on an additional magnetic-core inductor. Moreover, the ZCS operation of the converter improves the converter efficiency. The operating principle and theoretical analysis of the BISC converter under both forward and reverse modes are presented in detail. Simulation and experimental results from a 1.5 kW prototype validate the operation and characteristics of the BISC DC-DC converter.

A new nonisolated soft switched DC‐DC bidirectional converter with high conversion ratio and low voltage stress on the switches

“…Therefore, in recent years, bidirectional converters with high conversion ratio and low voltage stress have been considered 10 . Soft switching techniques are provided to increase the efficiency of bidirectional converters, in which zero voltage switching (ZVS) and zero current switching (ZCS) are the most popular examples of these techniques 11‐13 . Also, by providing a soft switching, the electromagnetic interference (EMI) noise in the converters is reduced 14 .…”

“…In Reference 12, the converter also has a high efficiency, but the number of converter elements is very high, and the converter control is complex. In Reference 13, a new ZCS bidirectional converter is presented. This converter has good voltage gain and efficiency, but the converter volume and the number of elements are very high.…”

Non‐isolated interleaved bidirectional DC–DC converter with high step voltage ratio and minimum number of switches

“…So, according to the drawbacks of the mentioned topologies, they are not good candidates for high voltage gain and high power or high current applications. To reduce these drawbacks, bidirectional interleaved converters combined with CI and/or SC techniques are introduced [19][20][21][22][23]. This approach in comparison to the conventional HSVR structures has some disadvantages like a large number of switches and high implementation complexity, while low ripple current in the LVS due to interleaved structure and the low voltage stress of the LVS switches are the major features of the mentioned topologies.…”

Soft‐switching bidirectional DC–DC converter with high voltage conversion ratio

“…However, implementation complexity, high semiconductor device count, high conduction losses, and low efficiency are the main drawbacks. Nowadays, the non-isolated BDCs include coupled inductors based converters, three-level, multilevel, and switched-capacitor types have attracted special interest due to low weight and cost, high efficiency, and simple structure [10][11][12][13][14]. The bidirectional buck/ boost topology is popular in many power electronic applications.…”