Digital current-mode controller for DC-DC converters

Hao, Peng; Maksimović, Dragan

doi:10.1109/apec.2005.1453091

Cited by 58 publications

(46 citation statements)

References 12 publications

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“…With this approach, a reconfigurable digital compensator can be used without the need for oversampling the inductor current. The high-frequency digital pulse-width modulator (DPWM) required for fully digital CPM schemes [7]- [10] is also eliminated, resulting in a practical, low-cost implementation.…”

Section: Voltage and Current Loop Controlmentioning

confidence: 99%

Thermal management for multi-phase current mode buck converters

Cao

Trescases

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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The main goal of this thesis is to develop an active thermal management control scheme for multi-phase current mode buck converters in order to improve the long term reliability of the converters. A thermal management unit (TMU) with independent linear compensators for the thermal loops is incorporated into the existing digital controller to regulate the current through each phase so that equal temperature distribution is achieved across all phases. A lumped parameter thermal model of the multi-phase converter is built as the basis of the TMU. iii

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Section: Voltage and Current Loop Controlmentioning

confidence: 99%

Thermal management for multi-phase current mode buck converters

Cao

Trescases

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…9). Such schemes have been presented in the past [24], [25] and provide direct control of the inductor current via a dedicated current reference value. An inner current loop regulates the inductor current on a cycle-by-cycle basis, while an output voltage control loop (VMC) provides the current reference value.…”

Section: B Loop Compensationmentioning

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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“…Reference [3] however shows that it is possible for a multiphase interleaved converter to obtain very high control loop bandwidth without increasing the switching frequency. Another approach is to use digital current mode control [5][6][7] typically implemented as a predictive average current mode control scheme. Reference [5] presents a digital peak current mode control scheme, which works by sampling the inductor current at a sampling rate of 25MHz, which is very inhibitive in terms of cost.…”

Section: Introductionmentioning

confidence: 99%

Digitally controlled point of load converter with very fast transient response

Jakobsen

Andersen

2007

2007 European Conference on Power Electronics and Applications

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This paper presents a new Digital Self-Oscillating Modulator (DiSOM) that allows the duty cycle to be changed instantly. The DiSOM modulator is shown to have variable switching that is a function of the duty cycle. Compared to a more traditional digital PWM modulator based on a counter and comparator the DiSOM modulator allows the sampling frequency of the output voltage control loop to be higher than the switching frequency of the power converter, typically a DC/DC converter. The features of the DiSOM modulator makes it possible to design a digitally controlled DC/DC converter with linear voltage mode control and very fast transient response. The DiSOM modulator is combined with a digital PID compensator algorithm is implemented in a hybrid CPLD/FPGA and is used to control a synchronous Buck converter, which is used in typical Point of Load applications. The computational time is only three clock cycles from the time the A/D converter result is read by the control algorithm to the time the duty cycle command is updated. A typical POL converter has been built and the experimental results show that the transient response of the converter is very fast. The output voltage overshoot is only 2.5% of the nominal output voltage when a load step of 50% -100% of nominal output current is applied to the converter. The settling time is approximately 8 PWM cycles.

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Digital current-mode controller for DC-DC converters

Cited by 58 publications

References 12 publications

Thermal management for multi-phase current mode buck converters

Thermal management for multi-phase current mode buck converters

Efficiency-Based Current Distribution Scheme for Scalable Digital Power Converters

Digitally controlled point of load converter with very fast transient response

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