Digital Pulse-Frequency/Pulse-Amplitude Modulator for Improving Efficiency of SMPS Operating Under Light Loads

Rahman, Nfa Abdul; Wang, K.; Prodić, Aleksandar

doi:10.1109/compel.2006.305667

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…It should be noted that, unlike in voltage mode digital pulse frequency regulators [25], [26], this implementation virtually does not introduce any hardware overhead, minimizing the overall cost of the controller implementation.…”

Section: Pulse Frequency Modulationmentioning

confidence: 98%

Multiphase optimal response mixed-signal current-programmed mode controller

Alico

Prodić

2010

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper presents a simple and practical implementation of a proximity optimal-time (OT) response controller for multiphase interleaved dc-dc switch-mode power supplies (SMPS). This novel solution enables equal current sharing between phases not only in steady state, but also during load transients. It also achieves a bump-less transition between the transient and steady state, where the interleaved operation is resumed without any delay. To minimize calculation burden and hardware complexity, a single digital voltage loop and multiple analog current loops are combined to implement a capacitor-charge balance based optimal-time recovery algorithm. The interface between the loops is provided through a structure consisting of a sample-and-hold circuit (S&H) and a relatively slow successive approximation digital-to-analog converter (DAC) providing control signals for all the current loops. The effectiveness of the controller is demonstrated on a 2-phase, 5V-to-1.8V, 20W, interleaved buck converter operating at a 1MHz switching frequency. The experimental results verify equal current sharing under all operating conditions, bump-less transition between the modes, and demonstrate that upon a transient converter reaches new steady state in the virtually fastest possible time.

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Section: Pulse Frequency Modulationmentioning

confidence: 98%

Multiphase optimal response mixed-signal current-programmed mode controller

Alico

Prodić

2010

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Therefore the switching frequency, maximum currents stress, and output ripple can also be indirectly controlled. Dynamic adjustment of on-times also allows for minimizing the switching losses for a given converter topology [14]. In the following section we briefly explain operation of the time-shared multi-output digital PFM controller.…”

Section: Introductionmentioning

confidence: 99%

Programmable digital controller for multi-output DC-DC converters with a time-shared inductor

Parayandeh

Stupar

Prodić

2006

2006 37th IEEE Power Electronics Specialists Conference

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This paper introduces a low power digital PFM controller for multi-output dc-dc converters suitable for integration in modern low-power management systems. It utilizes only one inductor to provide multiple output voltages and has very low power consumption. In addition, its reference voltages and switching frequency can be programmed dynamically. To achieve these characteristics two new key functional blocks are developed, namely Σ-∆ programmable delay-line based comparator utilizing natural filtering of delay cells and on-time control logic. The controller is implemented both on FPGA and a 0.18-µm CMOS application specific IC. Experimental results obtained with a 1 W, 9 V, four-output buck prototype and IC simulations successfully verify controller operation.

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“…Methods to increase efficiency at light load include reducing P sw can by reducing the switching frequency at light load [3]- [7]; and reducing P gate at light load [8]- [12]. These methods can improve the light load efficiency, but are difficult to control and require a complex control circuit; furthermore, audible noise and unstable output voltage can be generated when the frequency changes [13].…”

Section: Introductionmentioning

confidence: 99%

Improvement of power-conversion efficiency at light-load using a variable-duty burst mode

Lee

Sung

Yoon

et al. 2013

2013 IEEE Power and Energy Conference at Illinois (PECI)

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This paper proposes a new burst-mode driving method to increase the power-conversion efficiency (PCE) of a power supply at light load. The burst mode minimizes the power consumption by stopping the converter operation when load is light. The proposed method changes the off-period of the converter according to the load to achieve optimized efficiency across the entire load range. The PCE at 6% load was measured as 83.6% and 85.1% for 75-W flyback and LLC Half-bridge converters, repectively, when applying the proposed burst mode; these values were 8% and 16.5% higher respectively than those for the converters without it. Index Terms-Light load efficiency, power-conversion, dc-dc converter.Kyungmin Lee received the B.. His current research interests include the design of drive circuits for display devices and the modeling and characterization of semiconductor devices..

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Digital Pulse-Frequency/Pulse-Amplitude Modulator for Improving Efficiency of SMPS Operating Under Light Loads

Cited by 13 publications

References 6 publications

Multiphase optimal response mixed-signal current-programmed mode controller

Multiphase optimal response mixed-signal current-programmed mode controller

Programmable digital controller for multi-output DC-DC converters with a time-shared inductor

Improvement of power-conversion efficiency at light-load using a variable-duty burst mode

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