Fully Digital Current Mode Constant On-Time Controlled Buck Converter With Output Voltage Offset Cancellation

Hu, Kaiyu; Yeh, Wei-Ting; Tsai, Chien-Hung; Tsai, Chun-Li

doi:10.1109/access.2021.3133489

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The DC offset is small which is comparable to the other prior arts that take DC offset into consideration. Regarding transient response, it is evident that analog circuitries ( [20], [28], and [30]) inherit nature of fast response compared to those of digital circuitries ( [26], [35], and this work). In comparison to digital control in [26], the proposed DTOC shows less oscillation in voltage recovery, such that settling time can be minimized.…”

Section: Real Circuit Validationmentioning

confidence: 77%

“…Regarding transient response, it is evident that analog circuitries ( [20], [28], and [30]) inherit nature of fast response compared to those of digital circuitries ( [26], [35], and this work). In comparison to digital control in [26], the proposed DTOC shows less oscillation in voltage recovery, such that settling time can be minimized. In short, the overall performance indices in terms of constant frequency, output voltage offset correction, and the transient response are comparable to those of prior arts, which validate the effectiveness of the proposed methodologies.…”

Section: Real Circuit Validationmentioning

confidence: 77%

“…However, both methods could prolong transient response. To improve transient response, an accelerating circuit or an embedded digital algorithm was augmented to reduce the transient recovery time [21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Digital Adaptive On-Time and Transient-Optimized Ripple Controlled Buck Converter

Yang,

Wu,

Yeh

et al. 2023

IEEE Access

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Ripple-based buck converters often encounter issues of operating frequency variation, system stability, and steady-state voltage error, leading to degradation in voltage regulation performance. While analog controls are commonly employed to address these issues, they still face challenges due to process uncertainty and component parameter drifting caused by chip aging. In contrast, digital controls are more able to immune to the challenges that analog circuits faced. However, the sampling rate and analog-todigital conversion (ADC) are the two shortfalls that degrade circuit response time compared to that of the analog circuits. The weakness is being improved by design flexibility and algorithms. This paper introduces a novel approach utilizing a digital approach to reduce the variation of operating frequency to very low range, which is called digital constant frequency (DCF) control. Additionally, the digital transientoptimized control (DTOC) is proposed to significantly shorten the transient settling time. The digital control does not need to use the ADC. Given the load current change between 100 and 500mA, the DCF control reduced the operating frequency variation from 40% to 2.8%. Furthermore, the DTOC significantly shortened the settling time for both the rising and falling responses by 60% compared to the converter without DTOC. INDEX TERMSRipple-based buck converter, adaptive on-time, frequency variation, load transient, digital constant frequency (DCF), digital transient-optimized control (DTOC)

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Section: Real Circuit Validationmentioning

confidence: 77%

Section: Real Circuit Validationmentioning

confidence: 77%

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Digital Adaptive On-Time and Transient-Optimized Ripple Controlled Buck Converter

Yang,

Wu,

Yeh

et al. 2023

IEEE Access

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“…Several works research the control strategies of both single-phase and multiphase constant on-time control. In Hu et al, 11,12 digital V 2 COT control is proposed with adaptive voltage position. However, the ripple-based COT control (including CMCOT and V 2 COT control) is not suitable for pure digital implementation because of the existence of A/D sample delay and digital calculation delay, which limits the realization of the high switching frequency.…”

Section: Introductionmentioning

confidence: 99%

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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Fast transient response based on digital single-cycle charge regulation (SCCR) control

et al. 2023

J. Power Electron.

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Fully Digital Current Mode Constant On-Time Controlled Buck Converter With Output Voltage Offset Cancellation

Abstract: Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

Cited by 7 publications

References 21 publications

Digital Adaptive On-Time and Transient-Optimized Ripple Controlled Buck Converter

Digital Adaptive On-Time and Transient-Optimized Ripple Controlled Buck Converter

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

Fast transient response based on digital single-cycle charge regulation (SCCR) control

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