scholarly journals A New Buck-Boost AC/DC Converter with Two-Terminal Output Voltage for DC Nano-Grid

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3808 ◽  
Author(s):  
Xiangkun Li ◽  
Weimin Wu ◽  
Houqing Wang ◽  
Ning Gao ◽  
Henry Shu-hung Chung ◽  
...  
Keyword(s):  
Steady State ◽  
Output Voltage ◽  
Operating Principle ◽  
Small Signal ◽  
Grid System ◽  
Power Sources ◽  
Steady State Analysis ◽  
Dc Power ◽  
Signal Modelling ◽  
Conduction Mode

Due to the development and deployment of renewable DC power sources and their inherent advantages for DC loads in applications, the DC nano-grid has attracted more and more research attentions; especially the topologies of AC/DC converters are increasingly studied. When designing an AC to DC converter for a DC nano-grid system, the grounding configuration, which determines the costs, the efficiency as well as the safety, plays an important role. A three-terminal output AC to DC converter based on united grounding configuration has been presented for DC nano-grid. However, it has to be pointed out that the three-terminal output DC nano-grid is not as popular as the two-terminal DC output one, due to the infrastructure consideration. This paper proposes a new Buck-Boost AC to DC converter with two-terminal output voltage for DC nano-grid. The operating principle, the steady-state analysis, and the small signal modelling for the proposed converter working in continuous conduction mode are presented in detail. A 220 V/50 Hz/800 W prototype was fabricated to verify the effectiveness of the proposed converter.

A Novel Four Switch Infinite Level Inverter

2020 ◽  
Vol 29 (12) ◽  
pp. 2050193 ◽  
Author(s):  
K. T. Ajmal ◽  
K. Muhammedali Shafeeque ◽  
B. Jayanand
Keyword(s):  
Steady State ◽  
Theoretical Analysis ◽  
Output Voltage ◽  
Duty Ratio ◽  
Switching Frequency ◽  
Voltage Level ◽  
Steady State Analysis ◽  
Analysis And Design ◽  
Multilevel Inverters ◽  
Very High

A novel Four Switch Infinite Level Inverter (FSILI) is proposed in this paper. In conventional multilevel inverters, as the number of levels increases the output voltage becomes more sinusoidal. Unlike conventional multilevel topologies, the output voltage level in the proposed topology depends upon the switching frequency. Since the switching frequency is very high, the output voltage level approaches infinity, thus the name Infinite Level Inverter. Proposed topology requires only one inductor and capacitor reducing the size, weight and thus cost of the overall system. Inherent buck operation is happening in the proposed topology with a sine varying duty ratio PWM control. Steady-state analysis and design of the inverter are carried out. The proposed topology is simulated using Matlab/Simulink to evaluate the theoretical analysis and operation. A hardware prototype is also developed to validate the operation of proposed FSILI.

scholarly journals Characteristic frequencies in averaged description of step-down (BUCK) DC-DC power converter

2016 ◽  
Vol 65 (4) ◽  
pp. 703-717
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converter ◽  
Buck Converter ◽  
Small Signal ◽  
Characteristic Frequencies ◽  
Dc Power ◽  
Switch Mode ◽  
Power Stage ◽  
Control Circuits ◽  
Poles And Zeros ◽  
Conduction Mode

AbstractIn the description of small-signal transmittances of switch-mode power converters several characteristic frequencies are usually used, corresponding to poles and zeros of transmittances. The knowledge of these frequencies is important in the design of control circuits for converters and usually are assumed to be constant for a given power stage of a converter. The aim of the paper is to evaluate the influence of converter primary parameters and load conductance on characteristic frequencies. Analytical derivations and numerical calculations are performed for an ideal and non-ideal BUCK converter working in continuous or discontinuous conduction mode.

scholarly journals Small-signal input characteristics of step-down and step-up converters in various conduction modes

2016 ◽  
Vol 64 (2) ◽  
pp. 265-270 ◽  
Author(s):  
W. Janke ◽  
M. Walczak
Keyword(s):  
Low Frequency ◽  
Laboratory Model ◽  
Small Signal ◽  
Input Admittance ◽  
Discontinuous Conduction Mode ◽  
Dc Power ◽  
Signal Input ◽  
Analytical Formulas ◽  
Averaged Models ◽  
Conduction Mode

Abstract Small-signal input characteristics of BUCK and BOOST DC-DC power converters in continuous conduction and discontinuous conduction mode have been presented. Special attention is paid to characteristics in discontinuous conduction mode. The input characteristics are derived from the general form of averaged models of converters. The frequency dependence of input admittance and other input characteristics has been observed in a relatively low-frequency range. The analytical formulas derived in the paper are illustrated by numerical calculations and verified by experiments with a laboratory model of BOOST converter. A satisfying level of conformity of calculations and measurements has been obtained.

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