Multiphase voltage-mode hysteretic controlled VRM with DSP control and novel current sharing

Abu-Qahouq, J.A.; Pongratananukul, N.; Batarseh, Issa; Kasparis, Takis

doi:10.1109/iccdcs.2002.1004098

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…In this control method, using the output voltage ripple, the total phase's duty cycles are made and those duty cycles are distributed to each phase to achieve the interleaving function [7,8]. With this method, the interleaving function is perfectly achieved.…”

Section: Review Of the Hysteretic Control Methods For The Voltagementioning

confidence: 99%

“…And the load step up transient is not so good because the each phase's duty cycle cannot be overlapped (they are interleaved during the transient state also). Furthermore, in order to achieve the current sharing, the additional circuitry such as DSP is necessary, which makes the cost higher [8].…”

Section: Review Of the Hysteretic Control Methods For The Voltagementioning

confidence: 99%

“…Using the small signal assumption, the V PFD is treated as a sampled signal at the clock instance and the magnitude of this sampled signal is the average value of V PFD . Then with the averaging assumption, the frequency domain model is derived like (8). The F COMP (s) looks like an integrator with some delay near the switching frequency.…”

Section: B Linear Model For the Hysteretic Band Changing Loopmentioning

confidence: 99%

“…One is, based on the conventional linear control method for VR, implementing the nonlinear function during the transient [3][4][5][6]. The other is, based on the nonlinear control method such as the hysteretic control method, implementing the necessary functions during the steady state [7][8][9][10][11][12]. In this paper, based on the second approach, the challenges will be discussed and the possible solution will be proposed.…”

Section: Introductionmentioning

confidence: 99%

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Novel hysteretic control method for multiphase voltage regulators

Lee

2008

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition

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The faster dynamic response is one of the big challenges for the future microprocessor voltage regulators (VR). The hysteretic control method is one of the fastest control methods but it's hard to be used in multiphase VR because of the difficulty to achieve the constant switching frequency and the interleaving operation among the phases. To resolve this, the novel hysteretic control method is proposed. By slowly adjusting the hysteretic band width through the phase locked loop (PLL), the duty cycle is synchronized with an external fixed frequency clock reference. By phase shifting this external clock reference for each phase, the interleaving among the paralleled phases can be easily implemented. On the other hand, slow hysteretic band width changing will make this controller perform as the conventional hysteretic control during the transient for the fast dynamic response. After the transient, each phase will be pulled back to interleaving status through its band width adjustment. The analysis and design guide of the proposed control is provided and it is verified with the hardware.

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Section: Review Of the Hysteretic Control Methods For The Voltagementioning

confidence: 99%

Section: Review Of the Hysteretic Control Methods For The Voltagementioning

confidence: 99%

Section: B Linear Model For the Hysteretic Band Changing Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel hysteretic control method for multiphase voltage regulators

Lee

2008

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition

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“…9 Furthermore, interleaving also has several advantages such as higher frequency output voltage ripple with lower phase switching frequency, ripple cancellation, current sharing between phases that allows higher output, and also fast transient response which is limited mainly by the feedback control loop. 6 It is thus clear that by combining voltage-mode hysteretic control with the interleaving technique will result in a VRM that combines the advantages of both techniques.…”

Section: Interleaving (Multiphase) With Voltage-mode Hysteretic Controlmentioning

confidence: 99%

DSP-Controlled Multiphase Hysteretic VRM With Current Sharing Equalization

Abu-Qahouq

Pongratananukul

Kasparis

et al. 2005

J CIRCUIT SYST COMP

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Many of the new high-speed high-integration density Integrated Circuits (ICs) and future generation of microprocessor powering requirements can be successfully achieved with voltage-mode hysteretic control applied to interleaved multiphase Point-of-Load (POL) DC-DC converters or Voltage Regulator Modules (VRMs). This is because of the several advantages that can be achieved by combining the advantages of hysteretic control and interleaving. However, there are several challenges in combining the two techniques, the most prominent being the current sharing and equalization between the interleaved phases. In this communication, we present a solution based on a real-time DSP controller. Challenges of the implementation will be discussed and experimental results obtained from a prototype will be presented.

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A new digital adaptive voltage positioning technique with dynamically varying voltage and current references

Pan

Jain

2010

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

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Multiphase voltage-mode hysteretic controlled VRM with DSP control and novel current sharing

Cited by 11 publications

References 11 publications

Novel hysteretic control method for multiphase voltage regulators

Novel hysteretic control method for multiphase voltage regulators

DSP-Controlled Multiphase Hysteretic VRM With Current Sharing Equalization

A new digital adaptive voltage positioning technique with dynamically varying voltage and current references

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