A comparative theoretical analysis of distributed ladder converters for sub-module PV energy optimization

Kesarwani, Kapil; Stauth, Jason T.

doi:10.1109/compel.2012.6251780

Cited by 33 publications

(21 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Effective series inductance in the loop can be computed by determining the parasitic resonant frequency (similar to selfresonant frequency) of the SC converter. A loop inductance of 13.5 nH was determined using the method developed in [22][23]. The different topologies were tested by populating the relevant inductor footprints (or alternatively shunting the footprints with a copper tab, e.g.…”

Section: B Resultsmentioning

confidence: 99%

The direct-conversion resonant switched capacitor architecture with merged multiphase interleaving: Cost and performance comparison

Kesarwani

Stauth

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

Self Cite

View full text Add to dashboard Cite

Switched capacitor and resonant switched capacitor topologies have gained interest in recent years for highly integrated (monolithic) DC-DC converters, and more generally for a range of applications that require high density, high efficiency, and low cost. This work presents experimental and theoretical results for a new resonant topology that has architectural similarity to the more common 3-level buck converter. We further outline the prospects of using mergedinterleaving to reduce voltage ripple while maximizing the utilization of passive components. We present the results of an experimental prototype that can be configured as a switched capacitor, resonant switched capacitor, or resonant 3-level topology. Importantly, by constraining factors such as total cost of active and passive components, volumetric energy density, and other design factors, we attempt to provide a fair comparison of the respective converter prototypes for applications spanning DC power delivery, and power management for renewable energy applications such as photovoltaics and battery management.

show abstract

Section: B Resultsmentioning

confidence: 99%

The direct-conversion resonant switched capacitor architecture with merged multiphase interleaving: Cost and performance comparison

Kesarwani

Stauth

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…7(b), where R eff is the same as in (2). Full details of the SC calculation and a comparison to the ReSC case are presented in [14]. The concept of Fig.…”

Section: Proposed Architecturementioning

confidence: 98%

“…SC LADDER CONVERTER SC circuits are effective for fixed-conversion-ratio applications as discussed in [10]- [14]. Fig.…”

Section: Proposed Architecturementioning

confidence: 99%

“…Onset of the FSL will enforce a minimum achievable R eff that is dependent on R esr [10]. Further issues include high current spikes in the SC circuit that can complicate electromagnetic compatibility [14].…”

Section: Proposed Architecturementioning

confidence: 99%

“…A complete analysis of the "effective resistance" model and comparison of SC and ReSC architectures is presented in [14]. Fig.…”

Section: Resonant Ladder Convertermentioning

confidence: 99%

See 2 more Smart Citations

Resonant Switched-Capacitor Converters for Sub-module Distributed Photovoltaic Power Management

Stauth

Seeman

Kesarwani

2013

IEEE Trans. Power Electron.

Self Cite

260

111

View full text Add to dashboard Cite

This paper discusses the theory and implementation of a class of distributed power converters for photovoltaic (PV) energy optimization. Resonant switched-capacitor converters are configured in parallel with strings of PV cells at the sub-module level to improve energy capture in the event of shading or mismatch. The converters operate in a parallel-ladder architecture, enforcing voltage ratios among strings of cells at terminals normally connected to bypass diodes. The balancing function extends from the sub-module level to the entire series string through a dual-core cable and connector. The parallel configuration allows converters to handle only mismatch power and turn off if there is no mismatch in the array. Measurement results demonstrate insertion loss below 0.1% and effective conversion efficiency above 99% for short-circuit current mismatch gradients up to 40%. The circuit implementation eliminates large power magnetic components, achieving a vertical footprint less than 6 mm. The merits of a resonant topology are compared to a switched-capacitor topology.Index Terms-Maximum power point tracking (MPPT), microinverter, resonant converter, solar energy, switched-capacitor.

show abstract

Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Xiao-bing

Zhou

Liu

2023

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryAn analysis and design method of the equalization circuit based on switched‐capacitor (SC) units and graph networks is proposed in this paper. In the analysis method, the SC equalization circuit is decomposed into multiple SC units and one or more graph networks, which can simplify the analysis process. The effects of circuit parameters and structure on the equalization performance are analyzed in detail. And the average resistance distance among cells is proposed to mathematically analyze and compare the equalization path of the SC equalization circuits. Based on four types of SC units and graph networks of the equalization circuit, a design method of the SC equalization circuit and two SC equalization circuits are proposed. The proposed SC equalization circuit based on cell equalization units has the optimal equalization speed. The proposed SC equalization circuit based on cell equalization units and substring equalization units implements the trade‐off between equalization speed and device number. Simulation and experimental results are provided to verify the validity of the proposed analysis method and SC equalization circuits.

show abstract

A comparative theoretical analysis of distributed ladder converters for sub-module PV energy optimization

Cited by 33 publications

References 14 publications

The direct-conversion resonant switched capacitor architecture with merged multiphase interleaving: Cost and performance comparison

The direct-conversion resonant switched capacitor architecture with merged multiphase interleaving: Cost and performance comparison

Resonant Switched-Capacitor Converters for Sub-module Distributed Photovoltaic Power Management

Equalization circuit based on switched‐capacitor units and graph networks for series‐connected cell strings

Contact Info

Product

Resources

About