A bidirectional high step-up multi-input DC-DC converter with soft switching

Abstract

Summary With the advancement of technology in renewable energy resources, the researchers and engineers have been more interested in utilizing such energy resources in various types of applications. To utilize commercial loads, the produced energy should be transferred to a high voltage (HV) DC link. In this paper, a double input HV gain DC‐DC converter is proposed. The soft switching capability and bidirectional power flow are achieved in the proposed topology using a coupled inductor structure. Thanks to an improved switching strategy for different power flow modes, soft switching operation of four main switches is achieved in low voltage (LV) to HV power flow direction. In HV to LV power transfer, the soft switching of the half of switches still exists. Moreover, a HV gain is achieved due to utilizing the coupled inductor. To validate the operation of proposed converter in different operation modes, a laboratory prototype was tested, which its results is presented in the paper.

New family of expandable step‐up/‐down DC‐DC converters with increased voltage gain and decreased voltage stress on capacitors

“…These days, DC‐DC converters play a big role in diverse industrial applications . Up to now, various DC‐DC converters have been introduced .…”

“…These days, DC-DC converters play a big role in diverse industrial applications. [1][2][3] Up to now, various DC-DC converters have been introduced. [4][5][6] With introduction of converters as Zeta converter, Cuk converter, and SEPIC converter, high Abbreviations: SC, Switched capacitor; ESR, equivalent series resistance Symbols: C n , nth switched capacitor; C o , Filtering capacitor (output capacitor); D, Duty-cycle; D n , nth diode; f s , Switching frequency; G, ideal-state voltage gain (ideal-state voltage conversion ratio); G (real) , real-state voltage gain; I Co , Current across the filtering capacitor; I Cn , Current across the switched capacitors; I L1 , Current across the first inductor (L 1 ); I L2 , Current across the second inductor (L 2 ); I O , average output current; i L1 − min , minimum current of the first inductor; i L1 − max , maximum current of the first inductor; i L2 − min , minimum current of the second inductor; i L2 − max , maximum current of the second inductor; Δi L1 , First inductor's current ripple; Δi L2 , second inductor's current ripple; L 1 , First inductor; L 2 , Second inductor; M, ratio of voltage stress to output voltage; n, number of switched-capacitors; η, Efficiency of converter; R 1 , equivalent series resistance of the first inductor; R 2 , equivalent series resistance of the second inductor; S 1 , switch S 1 ; T n , nth T switch; T, One full cycle; V i , Ideal voltage source; V in , Input voltage; V O , Output voltage; V O(real) , Real-state output voltage; V GT , switching pulse for the T switches; V GS , switching pulse for the switch S; V Co , Voltage across the filtering capacitor; ΔV Co , Filtering capacitor's voltage ripple; V Cn , voltage across the nth switched capacitors; V Cn(real) , Real-state voltage across the nth switched capacitors; V Cn − max , maximum voltage of switched capacitors; V Cn − min , minimum voltage of switched capacitors; ΔV Cn , switched capacitors' voltage ripple; V L1 , Voltage across the first inductor; V L2 , voltage across the second inductor; V Dn , Voltage drop on nth diode; V S , Voltage drop on the switch S 1 ; V Tn , Voltage drop on nth T switch; V R1 , voltage drop on ESR of the first inductor; V R2 , voltage drop on ESR of the second inductor power applications were made possible because of their capability of providing high voltage gains.…”

Comparative analysis on selection and synthesis of multiple input converters: a review

“…With the advent increase in the advancements of multiple input converters (MICs), researchers have focused on developing MIC structures for various applications. For instance, state-of-the-art emphasising the topology has been presented in [12][13][14][15][16][17][18][19][20][21][22][23][24], whereas, state-of-the-art discussed in [25][26][27][28][29][30][31][32][33][34][35][36] emphasises on the MIC for hybrid energy systems applications. Further, MIC for PV applications has been reported in [11,[37][38][39][40][41][42][43][44][45] and MIC for hybrid vehicles has been discussed in [33,35,[45][46][47][48][49][50].…”

Modeling and implementation of a new boost converter with elimination of right‐half ‐plan zero

“…The requirement of switching converters working at high frequencies is necessary for those systems needing access to a low or medium power level. Generally, a dc/dc converter with a high voltage gain should be used as an intermediate device to boost low source voltage to higher levels 1‐8 …”