A new VRM topology for next generation microprocessors

Consoli, A.; Testa, A.; Giannetto, G.; Gennaro, F.

doi:10.1109/pesc.2001.954043

Cited by 33 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While techniques such as mode-hopping [4] and pulse skipping [5] reduce switching losses by allowing the converters to run in discontinuous conduction mode (DCM), literature is primarily focussed on the light load condition and do not really consider efficiency at other loads. For high efficiency across the whole range of load conditions, multiple converters maybe connected in series [6], parallel [7] or a combination of the two [8] to process the power more efficiently. The majority of this work has focussed on parallel connected modules since the number of active power modules (PMs) can be controlled according to power requirements.…”

Section: Introductionmentioning

confidence: 99%

“…High efficiency at heavy load is achieved by reducing conduction loss by sharing current between the PMs whilst high efficiency at light load is achieved using just one PM. By paralleling a greater number of PMs and allowing different current ratings for each PM, efficiency across the whole range of load conditions can further be improved [7][8][9]. Alternatively, without increasing the number of PMs, a single module can be designed to run at low frequency for high efficiency, without being constrained by the transient requirement which is fulfilled by the second module [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New design approach for higher energy efficiency with parallel converter

Tsang

Foster

Stone

2012

6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)

View full text Add to dashboard Cite

This paper proposes a new design approach for two nonidentical converters connected in parallel to obtain higher efficiency across the load range. This is achieved by allowing one converter to be designed for efficiency, without being constrained by system requirements, such as the transient response and current ripple, which will be met by the second converter. The efficiency of the proposed parallel converter is compared to an interleaved converter, both in theory and in practice.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New design approach for higher energy efficiency with parallel converter

Tsang

Foster

Stone

2012

6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)

View full text Add to dashboard Cite

show abstract

“…The additional current pump, as shown in Fig. 1, to improve the transient response of dc-dc converters was used in [9]- [14]. The current supply of the current pump technique is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Dual-Current Pump Module for Transient Improvement of Step-Down DC–DC Converters

Liu¹,

Chiu

et al. 2009

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Fig. 1. Current pump technique for dc-dc converters.Fig. 2. Transient current of current pump technique. Abstract-This paper presents a novel dual-current pump module (DCPM) to improve the transient response of dc-dc converters. The DCPM operates only during transient to provide two additional current injections for step-up load and current drains for step-down load. Due to the two current pump paths, the current stress on the switches of the DCPM is also reduced. The measurement results show that the DCPM can enhance the dynamic recovery time of the buck dc-dc converter by more than an order. Index Terms-Current pump, dc-dc converter , transient response.

show abstract

“…In [6], an auxiliary switch is used to bypass the output inductor of a Buck converter in order to provide a very low inductance path to the output. The switch remains full-on for the duration that the output voltage deviation exceeds a predetermined threshold.…”

Section: Introductionmentioning

confidence: 99%

“…Unpredictable auxiliary switching frequencies [7], [9] 4. No direct current-mode control of the auxiliary circuit resulting in unpredictable and potentially damaging currents [6], [8]- [9]; this may be particularly problematic for [6] which relies on the trace and switch inductance to limit the auxiliary current slew rate 5. High auxiliary peak current to average current ratio resulting in the necessity of relatively large auxiliary switches for desired dynamic performance [7]- [9] 6.…”

Section: Introductionmentioning

confidence: 99%

Controlled Auxiliary Circuit with Measured Response for Reduction of Output Voltage Overshoot in Buck Converters

Meyer

Zhang

Liu

2009

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition

View full text Add to dashboard Cite

In order to adhere to voltage regulation criteria, capacitor selection of a Buck converter must be based on the worst possible scenario. It is well known that, for a low duty cycle Buck converter, the output voltage deviation of a Buck converter undergoing an unloading transient will be significantly larger than that of a corresponding loading transient of equal magnitude. Therefore, in this paper, an auxiliary circuit and corresponding control method is presented to reduce the output voltage overshoot of a Buck converter undergoing an unloading transient. The proposed auxiliary circuit diverts a constant controlled current from the output of the converter to the input of the converter thereby significantly reducing the output voltage overshoot. In addition, the proposed auxiliary controller estimates the magnitude of the unloading transient and sets the auxiliary current to an appropriate level based on a pre-defined set of criteria. This allows for greater design flexibility and increases the auxiliary circuit efficiency for unloading transients of lesser magnitude. As demonstrated through simulation and experimental results, the proposed converter successfully estimates the unloading transient magnitude and diverts a proportional amount of current from the converter output.I.

show abstract

A new VRM topology for next generation microprocessors

Cited by 33 publications

References 3 publications

New design approach for higher energy efficiency with parallel converter

New design approach for higher energy efficiency with parallel converter

Dual-Current Pump Module for Transient Improvement of Step-Down DC–DC Converters

Controlled Auxiliary Circuit with Measured Response for Reduction of Output Voltage Overshoot in Buck Converters

Contact Info

Product

Resources

About