A Multi-resonant-core-based Series-parallel Resonant Switched-capacitor Converter with Wide Voltage Gain Range

2020 ◽  
Author(s):  
Shouxiang Li ◽  
Zhenning Li ◽  
Guoqiang Zhao ◽  
Wenhao Xie ◽  
Pengyu Jia ◽  
...  
Keyword(s):  
Switched Capacitor ◽  
Voltage Gain ◽  
Switched Capacitor Converter

scholarly journals An Analytical Approach for Design of a Cross-Connected Fibonacci Switched Capacitor Converter

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 431
Author(s):  
Wanglok Do ◽  
Hassan Bevrani ◽  
Qobad Shafiee ◽  
Kei Eguchi
Keyword(s):  
Analytical Approach ◽  
Equivalent Circuit Model ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Gain Function ◽  
Magnetic Components ◽  
High Voltage Gain ◽  
Switched Capacitor Converter ◽  
Capacitor Capacitance ◽  
Operation Frequency

Switched capacitor converters (SCCs) are used for low-power applications because they are designed without magnetic components. Among various types of SCCs, the Fibonacci SCC (FSCC) features a small size and high voltage gain. However, the FSCC performance can be more improved, which leads to suggest a cross-connected FSCC (CCFSCC). However, in the considered four-terminal equivalent circuit model for analyzing the CCFSCC, some circuit parameters, such as the operation frequency and capacitor capacitance of the SCC are neglected. In this paper, we propose an analytical approach to optimize the CCFSCC circuit parameters by deriving its voltage gain function. The validity of the addressed methodology is confirmed by comparing the outcomes with the results of simulations and experiments. It is shown that the average errors between the calculated and experimental voltage gains are 9%, and the average absolute errors between the calculated and simulated ones are under 0.1.

scholarly journals High Voltage using DC-DC Switched Capacitor Converter for PV Application without Transformer

2019 ◽  
Vol 9 (2S4) ◽  
pp. 431-434
Keyword(s):  
High Voltage ◽  
Electromagnetic Interference ◽  
High Efficiency ◽  
Life Time ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Ac Power ◽  
Switched Capacitor Converter ◽  
Current Ripples

In this paper, a DC-DC switched capacitor (SC) converter without using transformer is designed to achieve high voltage gain. Normally a transformer is used for AC-AC power conversion with step up or step down operation without changing the frequency. But it occupies more space due to its size and weight. Therefore, switched capacitor is used for achieving high voltage combine with converter, in order to avoid the transformer due to more expensive and losses. The traditional converter consists of more switches and stresses as well as losses with converter. In proposed converter, it uses fewer amounts of switches and gives high efficiency to increase the voltage gain. The current ripples are filtered that help to device life time and also reduce the electromagnetic interference. The designed converter is analyzed and the voltage is attained using MATLAB/Simulink.

HIGH-EFFICIENCY 2-STAGE MULTIPHASE SWITCHED-CAPACITOR CONVERTER VIA VARIABLE-PHASE AND PWM CONTROL

2010 ◽  
Vol 19 (08) ◽  
pp. 1753-1780
Author(s):  
YUEN-HAW CHANG
Keyword(s):  
Power Efficiency ◽  
Closed Loop ◽  
High Efficiency ◽  
Dynamic Error ◽  
Output Regulation ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Variable Phase ◽  
Analysis And Design ◽  
Switched Capacitor Converter

A closed-loop scheme of 2-stage multiphase switched-capacitor (MPSC) converter is proposed by combining variable-phase control (VPC) and pulse-width-modulation (PWM) technique for low-power DC-DC step-up conversion and high-efficiency output regulation. In this MPSC, there are 2 voltage doublers in series for boosting voltage gain up to 4 at most. Here, VPC is suggested to improve power efficiency, especially for the lower output voltage. It realizes a variable multiphase operation by changing MPSC topological path for more suitable level of voltage gain (4x/3x/2x/1x) according to the desired output. Besides, PWM is adopted for better output regulation not only to compensate dynamic error, but also to reinforce robustness against source/loading variation. Further, the theoretical analysis and design include: MPSC model, steady-state analysis, power efficiency, conversion ratio, ripple percentage, capacitance selection, stability, and control design. Finally, the closed-loop MPSC is simulated, and the hardware implementation is realized and tested. All the results are illustrated to show the efficacy of the proposed scheme.

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