A Symmetric Dual-Inductor Hybrid Dickson Converter for Direct 48V-to-PoL Conversion

Ellis, Nathan M.; Pilawa-Podgurski, Robert C. N.

doi:10.1109/apec43599.2022.9773452

Cited by 31 publications

(26 citation statements)

References 16 publications

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“…¶ The full load efficiency of the Vicor product is not available and is estimated. § Efficiency including gate loss for Symmetric-DIH is calculated based on the gate driving energy per switching cycle provided in [48]. 2 L loop i 2 L f sw ; 4) deadtime loss, PCB trace conduction loss, and gate loss estimated by Q g V drive f sw .…”

Section: Performance Discussion and Comparisonmentioning

confidence: 99%

MSC-PoL: Hybrid GaN-Si Multistacked Switched Capacitor 48V PwrSiP VRM for Chiplets

Wang¹,

Chen²,

Szczeszynski³

et al. 2023

Preprint

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This paper presents a multistack switched-capacitor point-of-load (MSC-PoL) voltage regulation module (VRM) with coupled magnetics for ultrahigh-current chiplet systems. In the MSC-PoL architecture, the stacked switched-capacitor cells split the high input voltage into several intermediate voltage rails, which are loaded with the switched-inductor cells to achieve soft charging and voltage regulation. Automatic capacitor voltage balancing and inductor current sharing are realized during the soft charging process. Many inductors of the switched-inductor cells are coupled into one and operated in interleaving to reduce the inductor current ripple and boost the transient speed. A 48-to-1-V/450-A VRM containing two MSC-PoL modules is built and tested, leveraging high voltage GaN devices for the front-end and high current Silicon devices for the back-end. Two ladder-structured coupled inductor designs are developed and compared, one of which installs a leakage magnetic plate to adjust the leakage inductance for lower current ripple. Featuring 3D stacked packaging, the entire power stage, gate drivers, and bootstrap circuits of one MSC-PoL module are enclosed into a 1/16-brick/0.31-in3/6-mm-thick package. The peak and the full-load efficiencies as well as the full-load power density (including both gate loss and size) of the MSC-PoL prototype with and without using the leakage plate are 91.7% and 89.5%, 85.8% and 85.6%, and 621 W/in3 and 724 W/in3, respectively. The 6-mm-thick MSC-PoL converter can be embedded into the chiplet or CPU socket, enabling power-supply-in-package (PwrSiP) for extreme efficiency, density, and control bandwidth.

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Section: Performance Discussion and Comparisonmentioning

confidence: 99%

MSC-PoL: Hybrid GaN-Si Multistacked Switched Capacitor 48V PwrSiP VRM for Chiplets

Wang¹,

Chen²,

Szczeszynski³

et al. 2023

Preprint

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“…(h) D-2L-direct PWM. Presented in [11], this topology results from converting the S-2L-direct PWM topology into its dual switch column variant, similar to the transformation from S-2L-tank into D-2L-tank. By doing so current is now symmetrically balanced among all components at both even and odd conversion ratios, with equal flying capacitor values being preferred.…”

Section: Fundamental Hsc Dickson Structuresmentioning

confidence: 99%

“…Step-up instantiations using either Dickson or CW networks were presented in [61] and [62] respectively where no consideration was given to either capacitor sizing or splitphase operation due to the use of diodes. Conversely, the modern synchronous variant described in [11] achieves bidirectional regulation capability with 2-phase operation on all switches bar the four mentioned.…”

Section: Fundamental Hsc Dickson Structuresmentioning

confidence: 99%

“…Eight fundamental variations of the HSC Dickson converter using either one or two inductors to achieve complete SSL mitigation. (a), (b), (c), (g) and (h) are discussed in [6], [7], [8], { [9], [10]} and [11] respectively, while (d), (e), and (f) are proposed here. Red and blue coloring indicates switches active during the primary two phases.…”

Section: Introductionmentioning

confidence: 99%

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

Ellis

Amirtharajah

2022

IEEE Trans. Power Electron.

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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.

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“…[5][6][7][8] The addition of an inductor suppresses sudden current changes during switching transitions and improves losses due to hard charging. In addition, papers [9][10][11][12][13][14][15] presented a dual-inductor hybrid (DIH) converter with an additional inductor. The use of two inductors in the DIH converter allows an even larger step-down ratio while maintaining the same duty cycle, thus reducing the inductor current ripple, and enabling high-current output.…”

Section: Introductionmentioning

confidence: 99%

A 24 V to 1 V integrated dual-charging path dual-inductor hybrid converter for improved step-up load transient response

Nishijima¹,

Umeki²,

Miyaji³

2023

Jpn. J. Appl. Phys.

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This paper proposes a dual-charging-path dual-inductor hybrid (DCP-DIH) converter that can charge two inductors simultaneously to improve the step-up load transient response. The proposed scheme only introduces one additional switch and capacitor to form a dual charging path during step-up load transient response. All power switches are integrated using 5 V transistors with 0.25 µm HV BCD process. Using type-3 PWM control combined with a fast load transient detector, simulation results show that the proposed circuit achieves 55.4 % voltage drop and 23.6 % recovery time reduction compared to the conventional DIH converter for load transient step from 20 mA to 4 A.

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A Symmetric Dual-Inductor Hybrid Dickson Converter for Direct 48V-to-PoL Conversion

Cited by 31 publications

References 16 publications

MSC-PoL: Hybrid GaN-Si Multistacked Switched Capacitor 48V PwrSiP VRM for Chiplets

MSC-PoL: Hybrid GaN-Si Multistacked Switched Capacitor 48V PwrSiP VRM for Chiplets

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

A 24 V to 1 V integrated dual-charging path dual-inductor hybrid converter for improved step-up load transient response

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