A Novel Adaptive-Ramp Ripple-Based Constant On-Time Buck Converter for Stability and Transient Optimization in Wide Operation Range

Kong, Le; Chen, Dan; Hsiao, Sheng-Fu; Nien, Chin-Fu; Chen, Ching-Jan; Li, Kuang-Feng

doi:10.1109/jestpe.2018.2812791

Cited by 16 publications

(7 citation statements)

References 18 publications

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“…By definition, duty cycle is a function of T on and T s , so the small signal model is derived with combination of FIGURE 6 The small signal block diagram of proposed COT regulator Equation (7).…”

Section: Verror_sig = Voutmentioning

confidence: 99%

“…Equations (6)(7)(8)(9)(10)(11) show the transfer functions of the internal ramp generation circuit. Aligning with Equations (1-5), the small signal model of the proposed constant on-time control is presented in Figure 6.…”

Section: Verror_sig = Voutmentioning

confidence: 99%

“…The popularity of constant on‐time (COT) control architecture continues to increase for point of load (POL) applications. Compared with conventional voltage‐mode and current‐mode control schemes, constant on‐time control has the following advantages: (1) fast transient response with direct voltage feedback; (2) simple implementation and small component count; and (3) high efficiency at light loads [1–22]. For a conventional voltage mode regulator, when the load transient happens, the system needs to wait for the next PWM switching cycle to make a correction; however, for COT architecture, the response is almost instantaneous.…”

Section: Introductionmentioning

confidence: 99%

“…In general, COT control can be implemented in different ways. Output voltage ripple and internal or external generated ramp can be used to generate a PWM signal [6, 7, 9, 10, 13–15, 16, 18–20, 22]. In Figure 1(a), a conventional ripple‐based COT regulator is presented [1, 2].…”

Section: Introductionmentioning

confidence: 99%

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Small signal modelling and stability analysis of internal ramp compensated constant on‐time controller with improved output voltage accuracy for point of load application

Peng

Chen

Petruzzi

et al. 2020

IET Power Electronics

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This paper investigates a constant on-time controller (COT) with internal ramp compensation and improved output voltage accuracy for point of load applications. The pulse width modulation (PWM) output is generated based on internal ramp: by sensing the regulated output voltage and comparing it to an internal reference target, an error signal is generated. This error signal is used to generate a reference for an added ramp signal, which is compared against an error voltage to generate a PWM trigger signal. An adaptive constant on-time scheme ensures a fairly constant switching frequency over a wide range of input and output voltages. This COT control algorithm is able to achieve high accuracy regulation (±0.5% of target) and fast transient response during load step change. A frequency domain small signal model is proposed, and an open loop gain transfer function is developed for this COT control system. The proposed small signal model and design analyses are verified with SIMPLIS simulations and experimental results. wileyonlinelibrary.com/iet-pel IET Power Electron.

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Section: Verror_sig = Voutmentioning

confidence: 99%

Section: Verror_sig = Voutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Small signal modelling and stability analysis of internal ramp compensated constant on‐time controller with improved output voltage accuracy for point of load application

Peng

Chen

Petruzzi

et al. 2020

IET Power Electronics

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“…Hence, solving the PQ Disturbances (PQD) is necessary, which is still a challenging task [3][4][5]. In general, the PQ issues fall under two categories: transient and steady state, among which the former includes interruptions, voltage sag/swell, and sudden transient fall, which affects both the customers and the grid with severe impacts [6][7][8]. To resolve the PQ issues, Custom Power Devices (CPD) are utilized, which mitigate the occurrence of abnormalities in the system but fail to improve the response time [9].…”

Section: Introductionmentioning

confidence: 99%

Power Quality Improvement Using ANN Controller For Hybrid Power Distribution Systems

Quawi¹,

Shuaib²,

Manikandan³

2023

Intelligent Automation &Amp; Soft Computing

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In this work, an Artificial Neural Network (ANN) based technique is suggested for classifying the faults which occur in hybrid power distribution systems. Power, which is generated by the solar and wind energy-based hybrid system, is given to the grid at the Point of Common Coupling (PCC). A boost converter along with perturb and observe (P&O) algorithm is utilized in this system to obtain a constant link voltage. In contrast, the link voltage of the wind energy conversion system (WECS) is retained with the assistance of a Proportional Integral (PI) controller. The grid synchronization is tainted with the assistance of the d-q theory. For the analysis of faults like islanding, line-ground, and line-line fault, the ANN is utilized. The voltage signal is observed at the PCC, and the Discrete Wavelet Transform (DWT) is employed to obtain different features. Based on the collected features, the ANN classifies the faults in an efficient manner. The simulation is done in MATLAB and the results are also validated through the hardware implementation. Detailed fault analysis is carried out and the results are compared with the existing techniques. Finally, the Total harmonic distortion (THD) is lessened by 4.3% by using the proposed methodology.

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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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A Novel Adaptive-Ramp Ripple-Based Constant On-Time Buck Converter for Stability and Transient Optimization in Wide Operation Range

Cited by 16 publications

References 18 publications

Small signal modelling and stability analysis of internal ramp compensated constant on‐time controller with improved output voltage accuracy for point of load application

Small signal modelling and stability analysis of internal ramp compensated constant on‐time controller with improved output voltage accuracy for point of load application

Power Quality Improvement Using ANN Controller For Hybrid Power Distribution Systems

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

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