Transient Response Improvement of DC-DC Converter by Current Mode Variable on Time Control

Zhen, Shaowei; Zeng, Penghao; Chen, Jiawei; Zhou, Wei; Wang, Jiajia; Luo, Ping; Zhang, Bo

doi:10.1109/mwscas.2018.8623868

Cited by 11 publications

(13 citation statements)

References 7 publications

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“…However, current sensing is more complex than voltage sensing. Therefore, many methods have been proposed to get the inductor current [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Control Method for Buck Converters

Chou,

Chen

2024

Preprint

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This paper presents an innovative control technique for buck converters. This control strategy is applied to the switch-inductor converter. It has the following features: (a) the dual loop control mechanism results in the high transient responses , (b) the near-constant switching frequency reduces the design effort of front-end EMI filters, (c) the adaptive on time control minimizes the over-shoot/undershoot, (d) from the viewpoint of circuit integration because the proposed circuit requires no special processes to fabricate. Therefore, it is low cost and suitable for mass production. This paper first describes the advantages and disadvantages of the various types of buck converters. Then, the operation of the proposed scheme is analyzed and explained further. The control scheme is verified by the SIMPLIS simulator and can be fabricated by UMC 0.18μm 1P6M CMOS processes in future.

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“…However, current sensing is more complex than voltage sensing. Therefore, many methods have been proposed to get the inductor current [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Control Method for Buck Converters

Chou,

Chen

2024

Preprint

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“…This paper uses the DAC to provide a modulated reference voltage, VREF, the purpose of which is to produce a reference voltage opposite to the VFB change when a transient response occurs, such that the output of EA and VC can be quickly clamped to a very high level or very low level [4] , so that the duty cycle through PWM modulation will be controlled to nearly 100% or 0% Status: where IS and T are the slope and period of the sensing current, respectively. As a result, the duty cycle quickly increases to the highest level that the converter can possibly reach, which allows the output voltage VOUT to be quickly restored [5] .…”

Section: Introductionmentioning

confidence: 99%

Transient Enhanced Mode design based on DC-DC Buck-Boost converter

Qiu

Guo

et al. 2022

J. Phys.: Conf. Ser.

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With the rapid development of electronic products, a system may suddenly start operating from a dormant state. In order to provide a stable supply voltage to a system with a rapidly changing load and to improve the transient response of the DC-DC, a Buck-Boost type DC-DC with a Transient Enhancement Mode is proposed, which improves the transient response during load switching and reduces the overshoot/undershoot voltage and recovery time. The oscillator part can respond to different load transients and output different frequency clock signals to finally achieve fast charging and slow discharging of the inductor. The specific circuit design and physical implementation of the proposed method are verified based on a 0.18μm high-voltage BCD process. The test results show that the minimum overshoot/undershoot voltage can reach 40mV and the fastest recovery time can reach 14μs, and the transient voltage and recovery time are reduced by 66% and 88% respectively compared with the DC-DC design without a fast Transient Enhancement Mode.

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“…In the diagram, the Delay module is implemented after the compensator, with t_on being a fixed value and t_off being a minimal value. Many technologies [8][9][10][11][12][13][14][15] have been proposed to improve the performance of COT under light loads, including various trajectory control technologies [8,13], time-optimized technology [9], various adaptive technologies [10][11][12] and current-mode control technologies [14,15]. In more detail, to follow the natural state trajectory of the system, Li et al [8] proposed a state-trajectory-based control with a single-cycle transient response.…”

Section: Introductionmentioning

confidence: 99%

“…Bari et al [12] solved the issue of the slow transient response caused by the fixed T_on operation that plagued the control of the constant on-time current mode (COTCM) by a new fast adaptive on-time control method. Zhen et al [14] improved the transient response and voltage scaling speed by using current mode variable on-time (CM-VOT) control. Zhang et al investigated the sub-harmonic instability of Constant Ontime Current-mode Controlled (COT-CMC) Buck converters with a proportional-integral (PI) compensator by using accurate reduced-order asynchronous-switching mapping and constant on-time current-mode control.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Constant On-Time Mode for Buck Circuits

Zhong

Shen

2021

Electronics

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To achieve a designed and fixed operating frequency for a controller with high dynamic performance and a high load capacity, a hybrid constant on-time (COT) voltage mode for a Buck circuit is proposed and discussed in this paper. The proposed hybrid strategy is a combination of the classical COT method, a dynamic reference voltage technology and a proportional–differential (PD) module. The workflow is demonstrated in brief, simulations of a Buck circuit with the proposed hybrid COT mode are conducted and comparisons with developed pulse-width modulation (PWM) technology and the hysteresis mode are made. The results show that, with the help of the proposed control scheme, impressive performance from the Buck circuit can be expected. The operating frequency can be fixed well by the hybrid technology without losses of performance and robustness in steady state and will not jump much even with the sudden change of the inputs and the load. The proposed control strategy contributes to the foundation of circuit design and optimization.

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Transient Response Improvement of DC-DC Converter by Current Mode Variable on Time Control

Cited by 11 publications

References 7 publications

A Novel Control Method for Buck Converters

A Novel Control Method for Buck Converters

Transient Enhanced Mode design based on DC-DC Buck-Boost converter

A Hybrid Constant On-Time Mode for Buck Circuits

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