Input Current Ripple Reduction in a Step-Up DC–DC Switched-Capacitor Switched-Inductor Converter

Abstract

This paper presents research results related to the concept of a high-voltage-gain DC-DC converter with a low input current ripple. In the proposed topology, a low-volume DC-DC switch-mode boost converter operates in parallel with a switched-capacitor voltage multiplier (SCVM). The overall converter achieves a four-fold voltage gain, but the voltage stress of the transistor and the diode of the boost converter is only half of the output voltage. This is achieved by applying the specific topology of the proposed converter. Furthermore, the boost part uses a low-volume choke as it operates in the discontinuous conduction mode (DCM). The parallel operation of the boost converter with the SCVM decreases the current stress in some components of the multiplier. This paper presents a concept of the hybrid converter, an analytical model for the selection of components and switching parameters, an efficiency model, and the verification of the converter operation through simulation tests and experiments.

Non‐isolated high step‐up DC–DC converter based on switched‐inductor switched‐capacitor network for photovoltaic application

“…With a low‐duty cycle, high‐voltage gain is achieved. A Boost DC–DC switched inductor switched capacitor converter with high‐voltage gain is proposed in [27]. The Boost converter operates in parallel with a switched‐capacitor voltage multiplier.…”

An Overview of Non-Isolated Hybrid Switched-Capacitor Step-Up DC–DC Converters

“…This article presents an overview of hybrid SC converters. It starts with a short review of pure SC circuits , but it focuses on modifications of those circuits mainly with the use of small resonant inductors, which leads to resonant SC circuits [40][41][42][43][44][45][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116], and the combination of traditional converters, such as the boost converter topology, with capacitor-based voltage multipliers .…”

“…Their inductance is so small that some articles utilize air-core inductors or parasitic inductance in wires to achieve the resonant charge interchange [108,[110][111][112]. The resonant charge interchange is a relatively new tendency among designers of SC circuits; it is relevant since several converters have been investigated with relatively large efficiency [40][41][42][43][44][45][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116]. The efficiency of pure SC circuits is limited due to an effect in which the charge interchange among capacitors produces a type of loss which can be called discharging loss.…”

“…The two main types of SC circuits are pure SC circuits and resonant SC circuits [40][41][42][43][44][45][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116]. Resonant circuits utilize a small inductor to produce a resonant-type sinusoidal current, but only one half cycle is used to transfer charge among the capacitors before disconnecting them.…”

“…A resonant design helps control the maximum or peak current among capacitors. References [13][14][15][16] have been dedicated to reviewing pure SC converters; this article extends the analysis to SC converters with resonant charge interchange [40][41][42][43][44][45][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116] and hybrid converters, converters that contain one or more energy stored inductors .…”