Digital Zero-Current Switching Lock-In Controller IC for Optimized Operation of Resonant SCC

Urkin, Tom; Sovik, Guy; Masandilov, Erez Erzol; Peretz, Mor Mordechai

doi:10.1109/tpel.2020.3029976

Cited by 15 publications

(9 citation statements)

References 26 publications

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“…The switching frequency and duty ratio are adjusted to match the resonance by sensing the resonant current. The examples of resonance tracking methods are introduced in [47] and [48]. The loss breakdown is analyzed to better understand the potential improvements of this converter.…”

Section: Hardware Implementation and Experimental Verificationmentioning

confidence: 99%

Geometrical State-Plane Analysis of Resonant Switched-Capacitor Converters: Demonstration on the Cascaded Multiresonant Converter

Pilawa-Podgurski

2023

IEEE Trans. Power Electron.

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To realize high efficiency and high power density for resonant switched capacitor (ReSC) converters, it is critical to have a thorough understanding of the soft-switching mechanism and design the converter appropriately. However, this can be challenging as the soft-switching operation depends on multiple variables and its design difficulty increases quickly with respect to the topology complexity. This paper demonstrates a framework of using geometrical state-plane analysis to facilitate ReSC converter design. The methodology is first applied to a basic 2-to-1 ReSC converter, and then extended to a new 4-to-1 ReSC converter topology we proposed, herein named cascaded multi-resonant converter. This topology has reduced component count thanks to a new "switching bus" architecture. However, it comes at a cost as the converter has multiple resonances within each switching cycle, complicating the soft-switching design. Despite the high circuit complexity, the state-plane analysis neatly provides analytical equations of all state parameters, which are verified by simulations and experiments. Our hardware prototype achieves 6000 W/in 3 power density at 48-to-12 V conversion and 80 A continuous output. Its peak efficiency reaches 99.02%, and full-load efficiency reaches 97.67%, including gate drive loss. Both the power density and efficiency are superior to the state-of-the-art 48-to-12 V solutions.

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Section: Hardware Implementation and Experimental Verificationmentioning

confidence: 99%

Geometrical State-Plane Analysis of Resonant Switched-Capacitor Converters: Demonstration on the Cascaded Multiresonant Converter

Pilawa-Podgurski

2023

IEEE Trans. Power Electron.

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“…This is the author's version which has not been fully edited and content may change prior to final publication. Citation information: DOI 10.1109/OJPEL.2022.3181338 output impedance exhibited by the converter due to its many parallel current paths [10]. opology operates in a similar manner to the series-parallel topology, and has the potential high performance in this application space compared to Dickson-based topologies due ive volume and low number of components, as the disadvantage of switch utilization is considering the actual switches available.…”

Section: Lceq1mentioning

confidence: 99%

“…It is challenging to achieve a perfect resonant operation. Often times, high-precision Class-I ceramic capacitors or dedicated active-turning controllers [10] are needed, resulting in higher cost and potentially lower power density.…”

Section: B Component Tolerancementioning

confidence: 99%

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

Abramson

et al. 2022

IEEE Open J. Power Electron.

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This article presents a family of resonant switchedcapacitor (SC) converters with multiple operating phases, herein named "Multi-Resonant SC Converter". These converters can be synthesized from the basic two-phase SC topologies, such as the Doubler and the Series-Parallel, and are capable of achieving the same conversion ratio with fewer capacitors and switches. The augmenting inductor can resonantly charge/discharge all flying capacitors at different resonances, thereby facilitating softcharging and soft-switching operation. Based upon this concept, an 8-to-1 Multi-Resonant-Doubler (MRD) converter and a 6to-1 Cascaded Series-Parallel (CaSP) converter are proposed and analyzed. Both theoretical analysis and experimental results from a practical implementation are provided to demonstrate the benefits of the multi-resonant approach. The designed hardware prototype is configurable and can achieve one of the best overall in-class performances for the intermediate bus conversion in data centers. At 48-to-6 V conversion, the prototype achieves 98.6% peak efficiency (98.0% including gate drive loss) and 1675 W/in 3 power density. At 48-to-8 V conversion, the prototype achieves 99.0% peak efficiency (98.5% including gate drive loss) and 2230 W/in 3 power density.

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“…Reference [11] further explores how the total passive volume (including both capacitors and inductors) of these hybrid SC converters can be optimized, resulting in much higher power densities than seen with a traditional buck converter. Furthermore, resonant operation allows for zero current or zero voltage switching (ZCS/ZVS), thereby reducing switching losses [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Multi-Ratio Operation of Flying Capacitor Multilevel Converters At and Above Resonance

Abramson

Coday

Brooks

et al. 2022

2022 IEEE 7th Southern Power Electronics Conference (SPEC)

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The flying capacitor multilevel (FCML) converter is an attractive candidate for dc/dc step-up and step-down applications due to its relatively low switch stress and greatly reduced inductor volume. It can be operated in either a regulating pulse width modulated (PWM) or fixed-ratio resonant mode. For fixed-ratio operation, the FCML converter is capable of achieving multiple rational conversion ratios (up to a maximum of N :1) with the same switch-capacitor network simply by changing the gating signals of its switches. In addition, the inductance requirement can be further reduced compared to regulated operation, while switching losses at resonance can be mitigated due to the presence of soft-switching. However, there is limited prior analysis of higher level-count (N ≥ 3) fixed-ratio FCML converters operating at resonance or above resonance, where the derivation of appropriate phase durations becomes significantly more involved. This work presents a full analytical method to calculate optimal phase durations for the fixed-ratio FCML converter across all rational conversion ratios while operating at or above resonance. Hardware results for an N = 5 FCML converter are presented for conversion ratios 5:1, 5:2, 5:3 and 5:4, illustrating the ability to use above-resonance operation to optimize the distribution of switching losses and conduction losses in the converter.

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Digital Zero-Current Switching Lock-In Controller IC for Optimized Operation of Resonant SCC

Cited by 15 publications

References 26 publications

Geometrical State-Plane Analysis of Resonant Switched-Capacitor Converters: Demonstration on the Cascaded Multiresonant Converter

Geometrical State-Plane Analysis of Resonant Switched-Capacitor Converters: Demonstration on the Cascaded Multiresonant Converter

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

Multi-Ratio Operation of Flying Capacitor Multilevel Converters At and Above Resonance

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