A wide load range ZVS high voltage gain hybrid DC‐DC boost converter based on diode‐capacitor voltage multiplier circuit

Abstract

Summary In this paper, a single‐switch hybrid high voltage gain boost converter topology employing zero‐voltage switching (ZVS) feature is proposed. The proposed converter can achieve high voltage gain with soft switching operation over a wide range of load. The topology is a combination of the Cockcroft‐Walton diode‐capacitor voltage multiplier and a conventional boost converter, which results in a hybrid DC‐DC converter. The diode‐capacitor ladder enables the converter to achieve high voltage gain without a transformer or coupled inductor. Because of its transformerless design, single switch with lower duty cycle requirement, and ZVS feature, the efficiency of the converter is improved significantly. Moreover, due to the input inductor, it is able to provide lower input current ripple and variable fractional voltage gain, which is a key requirement for maximum power point tracking (MPPT) in photovoltaic application. A 480‐W hardware prototype with 48‐V input voltage and 450‐V output voltage is developed, and experimental results are presented to validate the efficacy of the proposed converter. The total achievable efficiency is above 95.4%, in the full load range (80‐480 W).

A transformer‐less single‐switch boost converter with high‐voltage gain and mitigated‐voltage stress applicable for photovoltaic utilizations

“…By replacing the Equations (12) to 17, under the continuous conduction mode, the voltage gain of the proposed converter can be obtained as follows:…”

“…4,5 For this reason, various structures have been proposed to increase the voltage. Converters such as conventional boost, [6][7][8][9] buck-boost, [10][11][12] fly-back, 13,14 and Cuk 15,16 have not high-voltage gain, and electromagnetic interference (EMI) and diode back-flow problems can be seen in these converters because the high-voltage gain can be obtained in higher duty cycles for the power switches. Generally, power converters are time-varying nonlinear systems, and due to the uncertainty of the converter parameters, their ability to be accurately modeled in all operating conditions is extremely difficult, so the control process for the power converters is always a major challenge for designers.…”

Zero‐voltage switching half‐bridge pulse width modulation DC–DC converter with switched capacitor active snubber cell for renewable energy applications

“…Therefore, these converters are operated with soft switching (SS) snubber cells. In the literature, many SS converters that use zero‐voltage switching (ZVS) and zero‐current switching (ZCS) techniques are presented on increasing efficiency and power density 13–26 …”

Double boost‐flyback converter

“…The most common topologies used in such applications are conventional boost [6], interleaved boost [7], quadratic boost [8], zsource boost [9,10], voltage-multiplier cells [11][12][13][14][15][16][17][18][19], cascade topologies [20] and boost-flyback converters [21,22].…”