Modeling and design of current balancing control in voltage-mode multiphase interleaved voltage regulators

Tsai, Ming-Dar; Chen, Dan; Chen, Ching-Jan; Chiu, Chen-Hua; Chang, Wen-Hao

doi:10.1109/ipec.2010.5543348

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…This is the key difference of COT control compared to fixed-frequency control. The duty cycle equations with the current-balance loop can be derived as (10) and 11 Fig. 3 when the current-balance loop is implemented.…”

Section: Two Phases Buck Converter With Outer Loop and Current-balmentioning

confidence: 99%

“…Finally, the per-phase inductor current distribution i L1 and i L2 with outer loop and current-balance loop are derived as (12) and (13). The dc inductor current after current-balance loop closed can be obtained by substituting (9) and adjusted duty in (10) and (11) into (12) and (13).…”

Section: Two Phases Buck Converter With Outer Loop and Current-balmentioning

confidence: 99%

“…3. The model is derived using a similar approach of reference [10]. The current-loop gain can be measured by breaking S iL1 -S iL2 path.…”

Section: Small-signal Model and Design Consideration Of Current-mentioning

confidence: 99%

“…4 and 5, where the derivation is shown in the appendix. G id represents the transfer function from the duty cycle to the inductor current and is derived in [10]. The model in Fig.…”

Section: Small-signal Model and Design Consideration Of Current-mentioning

confidence: 99%

“…To overcome the current imbalance problem, active current balance controls were proposed [9]- [20]. In [9], [10], and [19], voltage mode control with a current-balance loop is analyzed. However, dc inductor current equations are not given for close-loop control.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Analysis and Design of Current-Balance Loop in Constant On-Time Controlled Multi-Phase Buck Converter

2020

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Constant on-time (COT) controlled multi-phase buck converter has been widely used in high-current applications such as computing devices to achieve high entire-load-range efficiency. However, the literature lacks comprehensive analysis and design guide of the current-balance loop in COT control, resulting in possible low efficiency, per-phase current protection false-trigger, and stability issue. To solve the aforementioned issues, dc inductor current equations and small-signal models are proposed for COT control with the current-balance loop. Current-balance loop gain design guideline is then proposed to achieve accurate dc current balance and stability. Experiment and simulation results verify the analysis and the accuracy of the proposed models. INDEX TERMS Multi-phase converter, constant on-time (COT) control, current-balance, small-signal model.

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Section: Two Phases Buck Converter With Outer Loop and Current-balmentioning

confidence: 99%

Section: Two Phases Buck Converter With Outer Loop and Current-balmentioning

confidence: 99%

“…3. The model is derived using a similar approach of reference [10]. The current-loop gain can be measured by breaking S iL1 -S iL2 path.…”

Section: Small-signal Model and Design Consideration Of Current-mentioning

confidence: 99%

“…4 and 5, where the derivation is shown in the appendix. G id represents the transfer function from the duty cycle to the inductor current and is derived in [10]. The model in Fig.…”

Section: Small-signal Model and Design Consideration Of Current-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comprehensive Analysis and Design of Current-Balance Loop in Constant On-Time Controlled Multi-Phase Buck Converter

2020

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Multiphase digital integration constant on‐time–controlled Buck converter with high‐resolution current balance scheme for ultrafast load transient

Li,

Xu,

Liu

et al. 2024

Circuit Theory & Apps

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SummaryIn this paper, a multiphase digital control called digital integration constant on‐time (DICOT) control is proposed, which applies the concept of signal accumulation, solves the drawbacks of ripple‐based digital COT control that the switching frequency and transient performance are affected by the A/D sample delay and sampling noise. Besides, the multiphase interleaving approach of the proposed DICOT control is well‐suitable for digital control and no higher calculation frequency is required compared to single‐phase. In the aspect of the current balance, almost all existing researches work on analog COT current balance scheme and few works are investigating the resolution improvement of digital COT current balance. In this paper, the current balance model of multiphase COT control is derived and can be applied in the Buck system with an arbitrary number of phases, the delay‐line‐based high‐resolution COT current balance scheme is proposed to enhance the control resolution. Finally, the two‐phase DICOT control is tested on the multiphase Buck system, the transient performance is tested of 100 A load step with the slew rate of 1000 A/μs, and the voltage undershoot and overshoot are 20 and 36 mV, respectively. The current balance is tested and the errors are 0.01% and 0.11% at the light and heavy loads, respectively.

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A hybrid inductor‐current sensor with fast response and high accuracy using online calibration for high‐frequency BUCK DC‐DC converters

Yuan,

Xie,

Chen

et al. 2024

Circuit Theory & Apps

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This paper introduces a hybrid inductor‐current sensor with fast response and high accuracy using online calibration for 25 MHz BUCK DC‐DC converter. The proposed inductor‐current sensor combines the high accuracy of the senseFET sensing method with the lossless and real‐time response characteristics of the RC filter technique. Comparing to exist techniques, the proposed calibration scheme can make filter coefficient converge even in unsteady state, which improve its effectiveness in practical application. Moreover, the proposed inductor‐current sensor utilizes sample‐based senseFET‐based current sensing to offer calibration reference, which avoid the use of high bandwidth amplifier. Digital current balance control is seamlessly integrated into the 25 MHz 2‐phase digital adaptive time‐controlled (AOT) BUCK DC‐DC converter through the utilization of the proposed hybrid inductor‐current sensor. The 2‐phase BUCK DC‐DC converter is implemented in a standard 0.18‐µm CMOS process. After online calibration, proposed hybrid inductor‐current sensor outputs a full‐wave waveform with high accuracy and low propagation delay of only 9 ns in post‐layout simulation.

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Modeling and design of current balancing control in voltage-mode multiphase interleaved voltage regulators

Cited by 11 publications

References 12 publications

Comprehensive Analysis and Design of Current-Balance Loop in Constant On-Time Controlled Multi-Phase Buck Converter

Comprehensive Analysis and Design of Current-Balance Loop in Constant On-Time Controlled Multi-Phase Buck Converter

Multiphase digital integration constant on‐time–controlled Buck converter with high‐resolution current balance scheme for ultrafast load transient

A hybrid inductor‐current sensor with fast response and high accuracy using online calibration for high‐frequency BUCK DC‐DC converters

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