Sensorless Current Estimation and Sharing in Multiphase Buck Converters

Foley, Raymond; Kavanagh, R.C.; Egan, M.G.

doi:10.1109/tpel.2010.2042072

Cited by 74 publications

(45 citation statements)

References 23 publications

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“…In order to implement the current sharing feature, many studies have been conducted [3,[8][9][10][11][12][13][14][15][16][17][18]. In [3], the multiple sensors and controllers are employed to control the individual phase current in real-time.…”

Section: Introductionmentioning

confidence: 99%

“…However, the methods mentioned above essentially require multiple current sensors which increase the implementation cost and the measurement error caused by uneven sensor gains. On the other hand, the current sensorless techniques have been proposed to implement the current sharing performance without any current sensors [10,11]. Reference [10] implements the current sensorless method to achieve the current sharing as well as the efficiency improvement.…”

Section: Introductionmentioning

confidence: 99%

“…However, this method cannot be directly applicable to current control applications such as battery chargers. In [11], the small signal perturbation technique is implemented to estimate the phase currents without current sensors. However, this method has a problem with low dynamic performance due to delays caused by the perturbation and measurement.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Phase Current Reconstruction Technique Using a Single Current Sensor for Interleaved Three-phase Bidirectional Converters

Lee¹,

Cho²,

Choe³

2016

Journal of Electrical Engineering and Technology

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Abstract-This paper proposes a new phase current reconstruction technique for interleaved threephase bidirectional dc-dc converters using a single current sensor. In the proposed current reconstruction algorithm, a single current sensor is employed at the dc-link, and the dc-link current information is sampled at either the peak or valley point of the pulse-width modulation (PWM) carriers regularly. From the obtained current information, all phase currents are reconstructed in a single PWM cycle. After that, the digital current controller is applied to achieve current balancing in each phase. Compare to the previous multiple current sensor method, the proposed strategy reduces the number of the current sensors in the interleaved three-phase bidirectional converter as well as reducing potential current sensing error caused by non-ideal characteristics of the multiple current sensors. The effectiveness of the proposed method is verified from the experiments based on a 3kW three-phase bidirectional converter prototype for the automotive battery charging application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Phase Current Reconstruction Technique Using a Single Current Sensor for Interleaved Three-phase Bidirectional Converters

Lee¹,

Cho²,

Choe³

2016

Journal of Electrical Engineering and Technology

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“…For example, converters can act as load on each other, compromising system stability and performance. Consequently, techniques to avoid these issues have been developed, referred to as "current sharing schemes," where the load current is shared among the different converters improving system performance, efficiency and life-time [9]- [13]. Another problem arising is beating of the switching signals between the individual converters, I.…”

Section: Introductionmentioning

confidence: 99%

“…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 [9]. For distributed systems, phase alignment and current sharing is more challenging and generally utilizes communication lines between the individual components [10]- [12].…”

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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Interleaved high conversion ratio DC–DC converter with output self‐balancing and current auto‐sharing for DC nanogrid application

Chen

Feng

Chen

et al. 2022

Circuit Theory & Apps

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In the application of bipolar DC bus configuration in the DC nanogrid, the unbalanced voltage of two outputs in bipolar DC bus, due to the unbalanced conditions of loads and/or energy sources, will cause deterioration of the power quality of the bus and may damage the switch, affecting the stability and safety of the system. In order to solve the problem of unbalanced voltage of two outputs, interleaved series capacitor based dual‐output converter with a high conversion ratio is presented in this paper. By applying negative current mode (NCM) to the main inductor, the character of two‐output self‐balancing and zero voltage switching (ZVS) of all switches for such this topology configuration is achieved. In the NCM mode, the parallel diodes of main switches are not conducted during dead time and guarantee the flowing path to load side. Thus, based on this condition, volt‐second balance of main inductor is obtained to get the character of two‐output self‐balancing. Furthermore, by adopting series capacitor in the proposed topology and based on the charge‐balance of the intermediate block capacitor, inductor current existed in the two phase could be auto‐sharing. Comprehensive operational principle analysis, loss analysis, and efficiency of the proposed converter under different load conditions have been given, and the comparison analysis of three operation modes and selection of negative current mode is clarified. Small signal model of the proposed converter is described to convenient for the controller design. Finally, simulation results and a 20–220 V prototype are built to verify the character analysis of the proposed converter.

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Sensorless Current Estimation and Sharing in Multiphase Buck Converters

Cited by 74 publications

References 23 publications

A Phase Current Reconstruction Technique Using a Single Current Sensor for Interleaved Three-phase Bidirectional Converters

A Phase Current Reconstruction Technique Using a Single Current Sensor for Interleaved Three-phase Bidirectional Converters

Scalable Digital Power Controller With Phase Alignment and Frequency Synchronization

Interleaved high conversion ratio DC–DC converter with output self‐balancing and current auto‐sharing for DC nanogrid application

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