Abstract
This paper proposes a high step-up low-ripple dc-dc converter for sustainable energy conversion. A high step-up voltage gain is obtained with an input-current doubler and a switched-capacitor circuit rather than having to use a transformer with a high turn ratio. A low input current ripple is achieved since the current ripples of two input inductors cancel each other out when the primary-side branches work in an interleaving way. A low output voltage ripple is got by charging and discharging complementarily with each other of two output capacitors. In addition, the proposed converter achieves zero-voltage switching (ZVS) for all power switches and zero-current switching (ZCS) for all rectifier diodes, which reduces the switching loss significantly. Moreover, an active-clamp capacitor is installed on the input-current doubler to suppress the voltage spike across the switches. A 400-W prototype converter was realized to demonstrate the above-mentioned performance.
Highlights
Research activities refer to development of environmentalfriendly and sustainable energy like solar energy and fuel cell have attracted extensive attention of academia and industry due to the gradual exhaustion of oil energy and the serious environmental pollution [1], [2]
In some low-voltage and high-current applications, such as photovoltaic (PV) power system and fuel cell (FCEL) power system, the DC-DC converter, which is located between the PV panel and the DC high voltage bus, is the key component to realize energy conversion and power control [3], it is required to obtain a high voltage gain
In order to solve above problems, a high step-up lowripple DC-DC converter with all power devices at soft switching is proposed in this paper
Summary
Research activities refer to development of environmentalfriendly and sustainable energy like solar energy and fuel cell have attracted extensive attention of academia and industry due to the gradual exhaustion of oil energy and the serious environmental pollution [1], [2]. Paper [23] presented a double-input current-fed DC-DC converter, which achieves ZVS for switches by using a low magnetizing inductance and obtains low-ripple input current with two input inductors, but it suffers high voltage spike across the switches due to the leakage inductor of transformer. Paper [25] proposed a current-fed DC-DC converter which achieves ZVS and ZCS for power switches, but the reverse-recovery problem of the rectifier diodes has not been solved, causing a low conversion efficiency. In order to solve above problems, a high step-up lowripple DC-DC converter with all power devices at soft switching is proposed in this paper It is composed of an input-current doubler, a switched-capacitor circuit, a transformer and its parallel inductor.
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