Modeling and Analysis of N-Branch Hybrid Switched Inductor and Capacitor Converter

Lei Yang,Junkang Ni,Xiaojie Li,Liansong Xiong,Li Ma,Xinghua Liu,Hui Cao

doi:10.3390/electronics10080891

Abstract

This paper proposes a family of N-Branch hybrid switched inductor and capacitor (SLC) converters. With the single circuit, the multi-level output voltage or current could be generated. The proposed converter is suitable both for the voltage source and the current source. The same LC network is reused for different LC branches. The proposed converter is controlled by the phase shift control method with a time domain multiplexing concept. The N level circuit is operated with the same frequency. One cycle period is divided into N small time cycles for each branch. The phase shift for each branch is 360°/N. The load voltage could be changed by modifying the duty cycle of the transistor. When the SLCs work in the resonant condition, the soft switching will be acquired. The power loss of transistors could be sharply reduced. In this paper, a 300 W SLC converter is constructed to verify the theoretical analysis and operation mechanism in the resonant condition and hard switching condition. With the experimental and simulated verification, the soft switching and the stable multi-level output voltage or current are achieved. The proposed SLC converter could be used for the multi-level voltage power supply system, such as the electric vehicle, the electric aircraft, autonomous underwater vehicles (AUVs) and a new energy generation system.

Highlights

There are different kinds of DC–DC converters
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The time domain multiplexing concept is used in this paper by dividing the one switching cycle phase to control method is adapted to get the required load voltage or current

Summary

Introduction

There are different kinds of DC–DC converters. The mostly popular one is the inductorbased converter. The resonant switched-capacitor (RSC) converter is proposed for high-power applications. In State 3, the input current flows to the capacitor CR and Branch 2. In State 5, the Electronics 2021, 10,in89p1ut current flows to the capacitor CR and Branch 3. During the period (t1~t2), as shown, the power source, inductor LR, and capacitor CR deliver their energy to Branch 1 at the same time. Where iin3(t) is the input current of Branch 3 During the period (t5~t6), as shown, the power source, inductor LR, and capacitor CR deliver their energy to Branch 3. Db3oaisrdse. tTahsetpheerdfourtmy acnycceleoofftSh3e. pTrhoepdosuetdy ScyLcCleccoonuvledrtbeer cisharensgpeedcttiovealcyhtieesvteedthiendtihfeferreesnotlnaoraaendstIvhfcoooDlwnt1adng≤iteiin.o13nT, aDabn2lde≤1th. 31e, normal and D3 c≤on13d,ittihoena. vTehreapgearlaomadetverosltoafgtehseVpor1o, pVoo2s,eadnSdLVCoc3o, ninveornteer switching cycle, could be expressed as:

Experimental and Simulated Verification

Case 1

Case 3

Case 5

Conclusions and Discussions