Two-Stage Approach for 12-V VR

Ren, Yanzhi; Xu, Ming; Yao, Kaiwei; Meng, Y.; Lee, F.C.

doi:10.1109/tpel.2004.836678

Cited by 108 publications

(31 citation statements)

References 6 publications

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“…The transfer function between the current command and the output voltage, with the current-loop closed, is (12) where is the number of phases. The corresponding openvoltage-loop output impedance is (13) Note that for high current-loop gain , both (12) and (13) become independent of the inductor value , since the current loop provides for this desensitivity [29,Ch.12]. Finally, the closed-loop output impedance of the converter is (14) where parameter models the loop delay, analogously to (7), and is the feedback control law.…”

Section: Voltage Feedback With Finite DC Gainmentioning

confidence: 99%

“…6, except now the voltage-loop controller generates a current command which is fed to the current controller. The transfer function between the current command and the output voltage, with the current-loop closed, is given by (12). The open-loop output impedance is given by (13).…”

Section: B Current-mode Controlmentioning

confidence: 99%

“…In this calculation, it is assumed that 1 V. Fig. 8(d) characterizes the second stage in a two-stage VR topology, powered from an intermediate 5-V bus [12]. Note that in all cases the feedback stability requirement dominates the other constraints.…”

Section: A Output Capacitor Sizementioning

confidence: 99%

See 2 more Smart Citations

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Peterchev

Sanders

2006

IEEE Trans. Power Electron.

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Abstract-A consistent framework for load-line regulation design is presented, applicable to microprocessor voltage regulators (VRs) using either electrolytic or ceramic output capacitors. With conventional feedback control, the loop bandwidth is limited by stability constraints linked to the switching frequency. The output capacitor has to be chosen sufficiently large to meet the stability requirement. Load-current feedforward can extend the useful bandwidth beyond that imposed by feedback stability constraints. With load-current feedforward, the size of the output capacitor can be reduced, since it is determined solely by large-signal and switchingripple considerations which are shown to be less constraining than the feedback stability requirement. This work points to the feasibility of microprocessor VR implementations using only a small number of ceramic output capacitors, while running at sub-megahertz switching frequencies.

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Section: Voltage Feedback With Finite DC Gainmentioning

confidence: 99%

Section: B Current-mode Controlmentioning

confidence: 99%

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Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Peterchev

Sanders

2006

IEEE Trans. Power Electron.

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“…Due to its features, this kind of converter can be used as a step-down converter in two-stage architectures ( [13]). An example of this kind of power architecture is shown in figure 2.…”

Section: Topologymentioning

confidence: 99%

Core-less multiphase converter with transformer coupling

González

Ferreros

Alou

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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Abstract-A coupled multiphase converter where the coupling among the phases is done using core-less planar transformers is presented in this paper. Operating principle of the transformercoupled converter has been presented previously in the literature and in this paper this concept is applied to develop a core-less converter. Two prototypes operating at high frequency (4 MHz), with low profile (3mm -4mm) and 60 W of output power, with two different core-less transformers are presented. Main advantages of applying this concept at high frequency are size reduction and operation with core-less transformers. This topology can be considered as a dc-dc transformer and applications for this topology can be 'dc-dc transformers' for two-stage power supply systems and voltage scaling power supplies.

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“…The validation of the design of the magnetic structure is done with PEmag [4] and a design methology for coupled inductor multiphase converters can be found in [5]. The magnetic structure used in this prototype was build using stacked PCB windings (Figure 13).…”

Section: ) Trade-off Between Magnetizing Inductance and Lossesmentioning

confidence: 99%

New control strategy for energy conversion based on coupled magnetic structures

González

Laguna

Alou

et al. 2008

2008 IEEE Power Electronics Specialists Conference

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Abstract-In this paper, a new strategy for energy conversion based on a coupled magnetic structure is presented. A proper control of the input voltages provides constant output voltage at any time and ideally no output filter is required and no energy is stored, enabling very fast dynamics and low losses in the converter since switching frequency can be very small. Ideal features and actual limitations of the proposed concept are analyzed. A prototype with a two-input magnetic structure is built in order to prove the concept.

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Two-Stage Approach for 12-V VR

Cited by 108 publications

References 6 publications

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Core-less multiphase converter with transformer coupling

New control strategy for energy conversion based on coupled magnetic structures

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