Step‐up/step‐down DC‐DC converter with near zero input/output current ripples

Abstract

A novel single switch two diode wide conversion ratio step down/up converter is presented. The proposed converter is derived from the conventional single-ended primary inductor converter (SEPIC) topology, and it can operate as a capacitor-diode voltage multiplier, which offers simple structure, reduced electromagnetic interference (EMI), and reduced semiconductor voltage stress. The main advantages of the proposed converter are the continuous input/output current, higher voltage conversion ratio, and near-zero input and output current ripples compared with the conventional SEPIC converter. The absence of both a transformer and an extreme duty cycle permits the proposed converter to operate at high switching frequencies. Hence, the overall advantages will be: higher efficiency, reduced size and weight, simpler structure and control. The theoretical analysis results obtained with the proposed structure are compared with the conventional SEPIC topology. The performance of the proposed converter is verified through computer simulations and experimental results.proposed converter to operate at high switching frequencies. Hence, the overall advantages will be: higher efficiency, reduced size and weight, simpler structure and control.Comparison results with the conventional SEPIC converter show that the proposed modified SEPIC is more suitable for applications that require a high input-to-output voltage conversion ratio. The proposed converter has few extra components compared to the conventional SEPIC converter, and it is regulated by the conventional PWM technique at constant frequency. However, the additional components is outweighed by the significant advantages gained, thus expecting the popularity of this technique to other exiting topologies. The performance of the converter is verified by means of simulation and experimental tests which confirm the operating principles of the proposed converter. 374

Modeling, control, and implementation of the soft switching dc-dc converter for battery charging/discharging applications

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A bidirectional DC/DC converter charge/discharge controller for solar energy illumination system integrating synchronous rectification SEPIC converter and active clamp flyback converter

“…The first stage DC/DC converter is responsible for charging controls and maximum power point tracking (MPPT) [7]; the second stage DC/DC converter is responsible for driving and dimming the output of the high-brightness LEDs (HBLEDs). These systems waste components, so a bidirectional DC/DC converter system has been proposed [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. By contrast, at night, the first stage DC/DC converter does not need to engage in charging functions-rather, the second stage DC/DC converter drives the HBLEDs for lighting functions.…”

Design and implementation of a high‐efficiency bidirectional DC‐DC Converter for DC micro‐grid system applications

“…From the background of improving technologies and ecology aspects, renewable energies such as solar energy, wind energy, and fuel cell have become global trends [1][2][3][4][5]. In distributed electric power system, independent power generation system or large-scale power system in parallel is a trend.…”