A 6 A, 93% Peak Efficiency, 4-Phase Digitally Synchronized Hysteretic Buck Converter With ±1.5% Frequency and ±3.6% Current-Sharing Error

Sun, Min; Yang, Zhe; Joshi, Kishan; Mandal, Dipak Kumar; Adell, P.C.; Bakkaloglu, Bertan

doi:10.1109/jssc.2017.2744618

Cited by 27 publications

(4 citation statements)

References 19 publications

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“…From Fig. 3, the type 1 devices perform two detection levels and a Owing to the energy-saving topic, many researches put much emphasis on the power conversion efficiency [6][7][8][9][10][11][12][13] and standby power losses of converter [14,15]. However, some PDs have low power modes or standby modes and for this reason it may be removed by the PSE.…”

Section: Introductionmentioning

confidence: 99%

Adaptive maintain power signature scheme for power over ethernet system

Zhu

2020

IET Power Electronics

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Power over Ethernet (PoE) technology has been widely used in networking market for its space-saving, flexibility and low cost. As the PoE system needs to meet maintain power signature (MPS) requirements specified by the IEEE standard, it is important for powered device (PD) to draw a predetermined minimum current. If the PD current goes below the minimum current, the power sourcing equipment (PSE) assumes the PD has been disconnected and terminates operating voltage. If a fixed current is added to exceed the minimum current, a phenomenon of power wasting will be caused during standby or ultralow power mode. This study proposes an adaptive MPS scheme to achieve power-saving and meet the MPS requirements. It consists of current comparator and MPS circuit to extract the periodic pulsed current for MPS requirements. The proposed scheme has been fabricated in 0.18 μm 100 V Bipolar-CMOS-DMOS process adding no extra pin and an area is 1.45 × 2.23 mm 2. Test results show that the proposed interface sources a periodic pulsed current with a period of 318 ms and 25% duty cycle to tackle the issue of MPS absence in very low power condition.

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Section: Introductionmentioning

confidence: 99%

Adaptive maintain power signature scheme for power over ethernet system

Zhu

2020

IET Power Electronics

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“…Additionally, modulation plays an important role in power electronics as it affects the power quality, objective fulfilling and stress on the elements of the system [21]. A common solution investigated in the literature is to employ phase-shedding control, which activates the optimum number of phases of the converter based on the load requirement [22]- [27]. However, with the conventional phase-shedding control, the first phases of the converter are always selected, while the other phases are switched on or off according to the load requirement.…”

mentioning

confidence: 99%

Rotating Phase Shedding for Interleaved DC–DC Converter-Based EVs Fast DC Chargers

Alharbi

Alcaide

Dahidah

et al. 2023

IEEE Trans. Power Electron.

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Fast DC Chargers are the key-enablers for the massive roll-out of electric vehicles (EVs) due to the reduced charging time. On the other hand, the rapid growth in battery technology with different voltages and charging requirements has imposed additional hurdles on the charger design to meet the efficiency requirements. Multiphase interleaved converters with conventional phaseshedding control improves the efficiency for a wide range of operations. However, they tend to operate certain phases, resulting in uneven thermal stress among the converter phases. This paper proposes a rotating phase-shedding control to distribute the switching activities among all phases, enhancing the system's reliability whilst retaining the efficiency improvement. The proposed technique selects the proper number of active phases based on the required charging profile and periodically swaps them with other phases to even out the stress. The thermal profile is extracted to assess the thermal damage of the power switches. The performance of the proposed approach is evaluated and compared with the conventional phaseshedding. The simulation and experimentally validated results confirm that the proposed technique achieves a better even distribution of the thermal damage between the phases compared with the conventional one. This will ultimately extend the lifetime of the system.

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“…The N-phase modality can generally reduce the settling time of the LED driver by N times because of the parallel operation [86], [90].…”

Section: Multi-phase Modalitymentioning

confidence: 99%

“…The resistor-based current-sensing features easy implementation and relatively high accuracy but compromises the power-efficiency. This is because the voltage drop on the current-sensing resistor typically consumes a large portion of power loss [90], [106].…”

Section: Dead-time Circuitmentioning

confidence: 99%

Design and realization of high-performance LED drivers for automotive lighting applications

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This Ph.D. program pertains to the design and monolithic realization of Light Emitting Diode (LED) drivers for automotive lighting where the imperative parameters are high power-efficiency and high reliability. The grand objectives thereto are substantial improved specifications over the state-of-the-art, including power-efficiency, reliability, current driving capability, and dimming range. To achieve the said grand objectives, the specific objectives are to decouple, and hence mitigate the following two major design trade-offs that limit the performance of contemporary automotive LED drivers. The first trade-off is between high reliability and high current driving capability, and applies to both single-phase and multi-phase LED drivers. Specifically, to achieve high current driving capability, the contemporary single-phase LED driver typically suffers from low reliability arising from large current ripples. On the other hand, the multi-phase LED driver is highly advantageous to provide high current driving capability, but suffers from low reliability because of the ensuing subharmonic oscillation. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel Pulse-Width-Modulation (PWM)-based dual-phase LED driver in Global Foundries (GF) 130nm BCDLite process. To achieve high current driving capability, we adopt a dual-phase power stage. To achieve high reliability, we propose an Average Current Control to eliminate the subharmonic oscillation by considering the complete inductor-current profile vis-à-vis peak current adopted/reported elsewhere. To further improve the reliability, we propose an accuracy-enhanced current sensor to ascertain good current balance in the adopted dual-phase power stage. With measurements on our prototype LED driver ICs embodying our aforesaid adoption and vi proposed circuits, we demonstrate, to the best of our knowledge, for the first time that the trade-off between high reliability and high current driving capability is decoupled, i.e., an LED driver uniquely featuring high reliability, yet high current driving capability. The second trade-off is between high power-efficiency and wide dimming range. Specifically, a wide dimming range is derived by means of high switching frequency, hence the ensuing reduced settling time of the LED current. This, however, in turn leads to a degradation of the power-efficiency due to increased switching losses. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel fully soft-switched LED driver in GF 130nm BCDLite process. We achieve wide dimming range by operating at high switching frequencies, but the high switching does not compromise the power-efficiency. Using a fully soft-switching approach, the ensuing switching losses are negligible. This is achieved by a proposed Hysteretic Soft-Switching Controller (HSSC) and proposed circuitries, i.e., a voltage detector, current sensor, and a level shifter. The HSSC enables complete soft-switching, including zerovoltage switc...

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A 6 A, 93% Peak Efficiency, 4-Phase Digitally Synchronized Hysteretic Buck Converter With ±1.5% Frequency and ±3.6% Current-Sharing Error

Cited by 27 publications

References 19 publications

Adaptive maintain power signature scheme for power over ethernet system

Adaptive maintain power signature scheme for power over ethernet system

Rotating Phase Shedding for Interleaved DC–DC Converter-Based EVs Fast DC Chargers

Design and realization of high-performance LED drivers for automotive lighting applications

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