Design Considerations of Time Constant Mismatch Problem for Inductor DCR Current Sensing Method

Hua, Lei; Luo, Shuang

doi:10.1109/apec.2006.1620717

Cited by 27 publications

(12 citation statements)

References 2 publications

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“…While this is the optimal distribution for identical converters (see section III), there are some limitations in practice. For example, currentsensing elements suffer from tolerances which can lead to a non-uniform distribution or may require calibration [15], [16]. Also the individual converters are typically not identical, due to effects of component variation, so that an equal distribution is rendered suboptimal in terms of efficiency.…”

Section: B Existing Current Sharing/distribution Techniquesmentioning

confidence: 99%

Efficiency-Based Current Distribution Scheme for Scalable Digital Power Converters

Effler

Halton

Rinne

2011

IEEE Trans. Power Electron.

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Abstract-The trend in next-generation switched-mode power supplies will lead to modular, scalable solutions which deliver power efficiently over a wide range of operation. This paper details a new approach to introduce more advanced control features to improve system efficiency into these scalable solutions. While these methods have been incorporated into multi-phase converters in the past, they all require the distribution of information among the individual converters. An advantage of the proposed method is that it does not require such communication signals between the individual power supplies and is therefore fully scalable and cost effective. A system comprising of individual, smart converters is proposed where each converter regulates its respective output power to a level with high efficiency. Converters not required for the delivered output power are shut down. The proposed approach is analysed theoretically. Implementation details for an FPGA experimental prototype system are given. The system performance for a four converter prototype system is analysed and discussed. The efficiency obtained is compared with the efficiency of a multi-phase system with phase-shedding operation and the efficiency of a system with independent power converters without phase shedding support.

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Section: B Existing Current Sharing/distribution Techniquesmentioning

confidence: 99%

Efficiency-Based Current Distribution Scheme for Scalable Digital Power Converters

Effler

Halton

Rinne

2011

IEEE Trans. Power Electron.

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“…Therefore, DCR sensing places a limit on the design of the inductor for maximum efficiency. In addition, the inductor resistance is subject to changes over temperature, which necessitates the use of temperature compensating circuitry [7]. This circuitry can be difficult to design and adds to the total size of the solution.…”

Section: Introductionmentioning

confidence: 99%

“…The most common technique for sensing the inductor current is to utilize the DC resistance of the inductor in the technique commonly referred to as DCR sensing [4][5][6][7]. A simplified two-phase architecture is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

An integrated current sense technique for multiphase buck converters to improve accuracy and reduce solution footprint

Reutzel

Chen

Ragona

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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Accurate and lossless current sensing is a must for high performance multiphase buck converters used in the latest voltage regulation modules (VRMs). This paper presents a sync FET on-state resistance based approach for reconstructing a highly accurate inductor current signal that is immune to changes in operating conditions and temperature. This technique replaces DCR based sensing and can be used with any controller which requires inductor current information. The sense circuitry is built into the MOSFET driver, which in turn is co-packaged with the MOSFETs for reduced total footprint and ease of design. In addition, the accuracy that can be achieved with this technique is significantly better than the typical accuracy achieved with DCR sensing.

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“…However, the advantages can only be fully exploited if phase alignment and current matching can be guaranteed at all times. While phase alignment is relatively simple for centrally controlled systems, current matching can be challenging in practice due to mismatch of the converters' impedances, lack of fast current control loops and sensitivity/noise issues in the current sensing [16]- [18]. For distributed systems, both phase alignment and current sharing are more challenging and generally utilize communication lines between the individual components [6], [19]- [22].…”

mentioning

confidence: 99%

Scalable Digital Power Controller With Phase Alignment and Frequency Synchronization

Effler

Halton

Mooney

et al. 2014

IEEE Trans. Circuits Syst. I

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Abstract-The trend in next-generation switched-mode power supplies will lead to modular, scalable solutions which deliver power efficiently over a wide range of operation. This paper details a new approach to introduce more advanced control features like phase-alignment and frequency synchronization into such scalable solutions. While these methods have been incorporated into multi-phase converters in the past, they all require the distribution of information among the individual converters. In distributed solutions, dedicated communication signals have been used to share this information. An advantage of the proposed method is that it does not require such communication signals between the individual power supplies and is therefore fully scalable and cost effective. Perturbances generated by the switching actions of the individual converters on the common input/output voltage are used by each converter to harvest information about the switching actions of its counterparts. An algorithm is proposed to align the individual phases and synchronize the switching frequencies based on this information. This allows a reduction of input/output capacitor ripple currents, similar to techniques used in multi-phase designs. Experimental results for an FPGA prototype implementation are presented.

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Design Considerations of Time Constant Mismatch Problem for Inductor DCR Current Sensing Method

Cited by 27 publications

References 2 publications

Efficiency-Based Current Distribution Scheme for Scalable Digital Power Converters

Efficiency-Based Current Distribution Scheme for Scalable Digital Power Converters

An integrated current sense technique for multiphase buck converters to improve accuracy and reduce solution footprint

Scalable Digital Power Controller With Phase Alignment and Frequency Synchronization

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