Large Signal Analysis on Variations of the Hybridized Dickson Switched-Capacitor Converter

Abstract

Dickson-type DC-DC converters have gained renewed interest in recent years due to their best-in-class volt-amp switch utilization. In addition, "hybrid" switched-capacitor (HSC) structures increase passive component utilization while avoiding the slow-switching limit (SSL), and yet, most HSC work to date has done little to assess large signal voltage ripple behavior and subsequent passive utilization limits. This work contributes a comprehensive review of contemporary Dickson-type HSC converters before introducing eight fundamental reduced HSC Dickson structures, including three that are proposed here. Analysis allowing characterization of large signal operating points, capacitor sizing regimes, switching schemes, and maximum allowable power throughput is introduced. The analysis for "splitphase" switching is also presented in detail, without making small ripple approximations. Furthermore, an expression for large ripple flying capacitor energy density utilization is derived, assisting with optimal topology selection and revealing that splitphase operation may be preferable for conversion ratios greater than 6:1. All analysis is verified in simulation, with an additional discrete hardware prototype further validating a complex case of resonant split-phase timing. The analytical results of seventeen distinct Dickson variations are recorded, assisting with topology selection and design.

Gallium Nitride-based 48V-to-1V Point-of-Load (PoL) Converter for Aerospace Telecommunications and Computing Applications

“…As a Dickson-type structure [19], the SDIH stage expresses best-in-class switch stress FOM [6], [7], [20], [21], with each switch within the SDIH stage subjected to a maximum blocking voltage of V IN /N, where N defines the SDIH order as annotated in Fig. 1.…”

Synthesis of Interleaved, Unipolar, Switched Capacitor DC–DC Converters

“…Even with this small set of candidates, the so-called Capacitor Optimised Interleaved Ladder (COIL) converter and Simplified Interleaved Ladder converter (SIL) are reported in this paper, which have important advantages over competing topologies. The resonant version of the SIL converter is compared in detail against a similar topology known as a D-2L-Tank [7], which has recently been proposed.…”

“…When compared with other interleaved converters, a resonant circuit has recently been reported in [7], which has a similar topology to the SIL converter. This converter has resulted from recent work on hybridisation of SC converters, which is looking at the optimum placement of the inductor in resonant implementations of SC circuits.…”

One‐cycle controllability of high step‐up Boost converter with coupled inductor

“…5 Usually, the renewable energies have the disadvantage of low output voltages. To satisfy the requirement of connecting to the grid, high step-up DC/DC converters have been prepared with different methods, for instance cascaded method, [6][7][8] switched capacitor technique [9][10][11][12] and coupled inductor. [13][14][15][16][17][18][19][20][21][22] Another important characteristic of the renewable energies is distributed generation (DG), which means a short distance from consumers.…”

“…Usually, the renewable energies have the disadvantage of low output voltages. To satisfy the requirement of connecting to the grid, high step‐up DC/DC converters have been prepared with different methods, for instance cascaded method, 6–8 switched capacitor technique 9–12 and coupled inductor 13–22 …”