基于自适应占空比调整的Buck-Boost型DC-DC变换器瞬态响应增强方法  被引量:2

Buck-Boost DC-DC Converter Transient Response Enhancement Method Based on Adaptive Duty Cycle Adjustment

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作  者:郭仲杰 邱子忆 李梦丽 卢沪 刘楠 GUO Zhongjie;QIU Ziyi;LI Mengli;LU Hu;LIU Nan(School of Automation and Information Engineering,Xi’an University of Technology,Xi’an,Shaanxi 710048,China)

机构地区:[1]西安理工大学自动化与信息工程学院,陕西西安710048

出  处:《北京理工大学学报》2023年第9期979-987,共9页Transactions of Beijing Institute of Technology

基  金:国家自然科学基金面上项目(62171367);陕西省重点研发计划项目(2021GY-060);陕西省创新能力支撑计划项目(2022TD-39)。

摘  要:针对传统脉冲宽度调制(PWM)峰值电流模的DC-DC变换器面临的瞬态响应能力有限的问题,提出了一种应用于Buck-Boost型变换器的瞬态响应增强方法,通过自适应时钟控制和DAC输出可变基准电压共同作用使得占空比迅速饱和,进一步提升了电感电流转换速率,从而加速瞬态响应;同时针对传统的负载瞬态检测产生的固有延时以及无法应用于动态电压调节(DVS)的系统等诸多的问题,提出了一种基于占空比采样的快速瞬态检测方法,该方法检测精度高、速度快且受PVT的影响较小.基于0.18μm高压BCD工艺,对提出的方法进行了具体电路设计与版图寄生参数提取,仿真验证结果表明:时钟频率为1~2 MHz,负载电流在5 ns内从-20 mA快速步进至-620 mA的设计环境下,本文提出的瞬态增强方法使得负载瞬态响应的过冲/跌落电压降至33 mV/39 mV;过冲/跌落恢复时间降至5μs/12μs.相比于现有系统,减小了62%/56%的过冲/跌落电压;过冲/跌落恢复时间减小了92%/80%,为快速瞬态响应的PWM峰值电流模DC-DC提供了一定理论支撑.An adaptive duty cycle adjustment Buck-Boost converter was presented to improve the load transient response ability of traditional PWM peak value current mode.Firstly,combining the actions of adaptive clock control and DAC output variable reference voltage to make rapid duty cycle saturation,it was arranged to further increase the conversion rate of inductor current so as to accelerate the transient response.Furthermore,to solve some problems such as the inherent delay generated by traditional load transient detection and the inability to be applied to systems with Dynamic Voltage Scaling(DVS),a rapid transient detection method was proposed based on duty cycle sampling to be provided with highly accurate,fast detection,and less affected by PVT.Finally,taking 0.18μm high-voltage BCD process as condition,the proposed method was verified by specific circuit design and domain physical parameters pick-up.The simulation results show that the transient enhancement method proposed in this article can reduce the overshoot/undershoot voltage of load transient response to 33 mV/39 mV under the design environment of clock frequency 1~2 MHz and load current fast stepping from-20 mA to-620 mA in 5 ns.Compared to the conventional PWM peak-current mode operation,the overshoot/undershoot voltage can be reduced by 62%/56%and the overshoot/undershoot recovery time decreases to 5μs/12μs,being reduced by 92%/80%.It can provide a theoretic support for speediness transient response of PWM peak-current mode DC-DC.

关 键 词:DC-DC变换器 瞬态响应 快速瞬态检测 自适应时钟控制 

分 类 号:TN86[电子电信—信息与通信工程]

 

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