High Step-Up Converter Series Based on the Diode-Capacitor Network

This essay is about the application of a diode-capacitor network on conventional non-isolated DC–DC converter. The study will focus on obtaining high step-up voltage gain, low switch voltage stress, simple control, and high conversion efficiency. Three single-switch step-up converters with high step-up ratio based on the diode-capacitor network are proposed. The principle of operation and theoretical analysis of every single-switch step-up converter is evaluated for both continuous and discontinuous conduction modes. Given the mirror-symmetrical characteristic of the diode-capacitor network, cascade single-switch step-up converters based on the single-switch positive-output step-up converter are achieved when several diode-capacitor networks are arranged in series. Simulation analysis and experimental results obtained from the implemented prototypes operating at 40 kHz are provided to verify the performances of the proposed step-up converters.

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Design and implementation of modified multilevel sepic converter for PV based apllications

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v14.i3.pp1125-1133 ◽

2019 ◽

Vol 14 (3) ◽

pp. 1125

Author(s):

Arunkumari T ◽

I. Jagadeesh ◽

Indragandhi V

Keyword(s):

Theoretical Analysis ◽

Input Voltage ◽

Experimental Results ◽

Voltage Gain ◽

Matlab Simulink ◽

Design And Implementation ◽

Voltage Ripple ◽

Voltage Stress ◽

Conduction Mode ◽

Continuous Conduction Mode

In this manuscript, a DC-DC converter of modified multilevel sepic model with single switch is proposed here. The designed converter combines the voltage tripler circuit, which improves the voltage gain and reduces the voltage ripple of the system. Another feature of the designed converter is reduces the voltage stress and utilized for PV based applications. The operation of the designed converter in Continuous-Conduction Mode (CCM) is discussed. The converter boosts the PV input voltage of 30 V to 400 V output voltages. The efficiency attained by the designed converter is 94%. The Theoretical analysis of the designed converter is presented and it is done with MATLAB simulink. To analyse the performance of this DC-DC converter a model was developed and tested. From the experimental results obtained, it is analysed that the converter performs better and suitable for PV based application.

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Design and experimental demonstration of a high conversion efficiency OPCPA pre-amplifier for petawatt laser facility

High Power Laser Science and Engineering ◽

10.1017/hpl.2018.52 ◽

2018 ◽

Vol 6 ◽

Cited By ~ 7

Author(s):

Xiao Liang ◽

Xinglong Xie ◽

Jun Kang ◽

Qingwei Yang ◽

Hui Wei ◽

...

Keyword(s):

Conversion Efficiency ◽

Nonlinear Crystal ◽

Beam Quality ◽

Pump Energy ◽

High Conversion ◽

Signal Pulse ◽

High Conversion Efficiency ◽

Optical Parametric ◽

Good Beam Quality ◽

Laser Facility

We present the design and experiment of a broadband optical parametric chirped-pulse amplifier (OPCPA) which provides high conversion efficiency and good beam quality at 808 nm wavelength. Using a three-dimensional spatial and temporal numerical model, several design considerations necessary to achieve high conversion efficiency, good beam quality and good output stability are discussed. To improve the conversion efficiency and broaden the amplified signal bandwidth simultaneously, the nonlinear crystal length and OPCPA parameters are analyzed and optimized with the concept of dissipating amplified idler between optical parametric amplification (OPA) of two crystals configuration. In the experiment, an amplifier consisting of two OPCPA stages of ‘L’ type configuration was demonstrated by using the optimized parameters. An amplified signal energy of 160 mJ was achieved with a total pump-to-signal efficiency of 35% (43% efficiency for the OPCPA stage 2). The output bandwidth of signal pulse reached 80 nm and the signal pulse was compressed to 24 fs. The energy stability reached 1.67% RMS at 3% pump energy variation. The optimized OPCPA amplifier operates at a repetition rate of 1 Hz and is used as a front-end injection for the main amplifier of SG-II 5PW laser facility.

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